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WO2018143125A1 - Dispositif de formation d'image et procédé de formation d'image - Google Patents

Dispositif de formation d'image et procédé de formation d'image Download PDF

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Publication number
WO2018143125A1
WO2018143125A1 PCT/JP2018/002728 JP2018002728W WO2018143125A1 WO 2018143125 A1 WO2018143125 A1 WO 2018143125A1 JP 2018002728 W JP2018002728 W JP 2018002728W WO 2018143125 A1 WO2018143125 A1 WO 2018143125A1
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WO
WIPO (PCT)
Prior art keywords
medium
drying
unit
image
image forming
Prior art date
Application number
PCT/JP2018/002728
Other languages
English (en)
Japanese (ja)
Inventor
荒木　勝己
隆秀 岡崎
Original Assignee
富士フイルム株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Publication of WO2018143125A1 publication Critical patent/WO2018143125A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H5/00—Feeding articles separated from piles; Feeding articles to machines
    • B65H5/22—Feeding articles separated from piles; Feeding articles to machines by air-blast or suction device

Definitions

  • the present invention relates to an image forming apparatus and an image forming method, and more particularly to a transport unit that transports a medium.
  • a technique for coating a surface that supports a medium is known for the purpose of suppressing adhesion of ink or toner and improving releasability of ink or toner in a conveyance belt that conveys the medium.
  • Patent Document 1 describes a conveyance belt containing a polyimide resin, a conductive filler, and a fluorine filler.
  • the contact angle of pure water is 80 degrees or more and 120 degrees or less.
  • the conveyance belt described in Patent Document 1 has a surface roughness Rz of 1.5 micrometers or less. The surface roughness Rz represents the maximum height.
  • conveyance belt in this specification corresponds to the seamless belt in Patent Document 1.
  • Patent Document 2 describes an image forming apparatus including a drying unit that dries a medium on which an image is formed using ink.
  • the drying unit described in Patent Document 2 includes a drying transport unit that transports a medium.
  • the transport belt constituting the drying transport unit has a two-layer structure configured using an elastic member layer and a metal layer.
  • the medium in this specification corresponds to the paper in Patent Document 2.
  • the drying unit in this specification corresponds to the ink image drying apparatus in Patent Document 2.
  • the conveyance belt in this specification corresponds to the first paper conveyance belt in Patent Document 2.
  • Patent Document 3 describes an image forming apparatus including a conveyance belt that conveys a medium.
  • the conveyance belt described in Patent Document 3 has a contact angle with respect to ink of 60 degrees or more and 120 degrees or less.
  • Patent Document 3 describes polyvinylidene fluoride, polycarbonate, ethylene-tetrafluoroethylene copolymer, and polytetrafluoroethylene as materials constituting the conveyor belt.
  • the medium in this specification corresponds to the recording medium in Patent Document 3.
  • the image forming apparatus in this specification corresponds to the ink jet printer disclosed in Patent Document 3.
  • Patent Document 1 has a contact angle of pure water and a surface roughness of a conveyor belt containing a polyimide resin, a conductive filler, and a fluororesin filler for the purpose of achieving both the transportability of the medium and the cleanability.
  • the thickness Rz is determined, it does not focus on the problems of suppression of cockling and suppression of image failure.
  • Patent Document 2 does not focus on issues such as suppression of cockling and suppression of image failure, although the temperature condition of the conveyor belt is determined for the purpose of efficiently drying the image.
  • Patent Document 3 pays attention to the problems such as the occurrence of curling when plain paper is used and the stain caused by long-term use of the conveyor belt, and the ink contact angle and the material constituting the conveyor belt are Although determined, it does not focus on issues such as suppression of cockling and image failure.
  • Patent Documents 1 to 3 do not describe means for achieving both cockling suppression and image failure suppression. In addition, Patent Documents 1 to 3 do not describe double-sided printing. Furthermore, Patent Document 1 and Patent Document 3 do not describe ink drying processing.
  • the present invention has been made in view of such circumstances, and an object thereof is to provide an image forming apparatus and an image forming method capable of achieving both suppression of cockling and suppression of image failure in double-sided printing. To do.
  • An image forming apparatus includes an image forming unit that forms an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image using the image forming unit.
  • a drying unit that performs a drying process on the medium on which the image is formed. In the drying unit to which a temperature condition of 80 ° C. or more and 140 ° C. or less is applied, and in the drying processing region in the drying unit, an image is formed using the image forming unit.
  • a drying conveyance unit that conveys the formed medium in the medium conveyance direction, and includes a drying conveyance unit including a conveyance belt having a structure in which a plurality of suction holes are formed on a medium support surface on which the medium is supported, and a plurality of adsorptions
  • An adsorption portion that adsorbs a medium by generating an adsorption pressure of 3.0 kilopascals or more and 11.3 kilopascals or less in the hole, and an adsorption hole is disposed in a medium support area where the medium is supported on the medium support surface.
  • Non-hole placement area not , A fluororesin film having an arithmetic average surface roughness of 0.83 to 6.0 micrometers and a static contact angle with respect to ink of 83.5 degrees to 90.5 degrees is formed.
  • An image forming apparatus An image forming apparatus.
  • the first aspect in double-sided printing in which images are formed on the first surface and the second surface, it is possible to simultaneously suppress the occurrence of cockling and the occurrence of white spot image failure.
  • the image In duplex printing in which images are formed on the first surface and the second surface, the image may be formed on the second surface after the image is formed on the first surface. In double-sided printing in which an image is formed on the first surface and the second surface, the image may be formed on the first surface after the image is formed on the second surface.
  • the second aspect includes a temperature condition setting unit that sets a temperature condition of the drying unit, and the temperature condition setting unit has a temperature condition of 80 ° C. or more and 140 ° C. or less as the temperature condition of the drying unit. It is good also as a structure which sets.
  • the temperature condition of the drying section can be 80 ° C. or higher and 140 ° C. or lower.
  • An image forming apparatus includes an image forming unit that forms an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image using the image forming unit.
  • a drying unit that performs a drying process on the medium on which the image is formed. In a drying unit to which a temperature condition of 80 ° C. or more and 160 ° C. or less is applied, and in a drying processing region in the drying unit, an image is formed using the image forming unit.
  • a drying conveyance unit that conveys the formed medium in the medium conveyance direction, and includes a drying conveyance unit including a conveyance belt having a structure in which a plurality of suction holes are formed on a medium support surface on which the medium is supported, and a plurality of adsorptions
  • An adsorption portion that adsorbs a medium by generating an adsorption pressure of 3.0 kilopascals or more and 11.3 kilopascals or less in the hole, and an adsorption hole is disposed in a medium support area where the medium is supported on the medium support surface.
  • Non-hole placement area not A fluororesin film having an arithmetic average surface roughness of 2.0 micrometers to 6.0 micrometers and a static contact angle with respect to ink of 83.9 degrees to 90.5 degrees is formed.
  • the temperature condition of the drying section is 80 ° C. or higher and 160 ° C. or lower, it is possible to obtain the same effect as that of the first aspect.
  • a temperature condition setting unit that sets a temperature condition of the drying unit is provided, and the temperature condition setting unit is a temperature condition of 80 ° C. or more and 160 ° C. or less as the temperature condition of the drying unit. It is good also as a structure which sets.
  • the temperature condition of the drying section can be set to 80 ° C. or more and 160 ° C. or less.
  • An image forming apparatus includes an image forming unit that forms an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image using the image forming unit.
  • a drying unit that performs a drying process on the medium on which the image is formed. In the drying unit to which a temperature condition of 80 ° C. or more and 100 ° C. or less is applied, and in the drying processing region in the drying unit, an image is formed using the image forming unit.
  • a drying conveyance unit that conveys the formed medium in the medium conveyance direction, and includes a drying conveyance unit including a conveyance belt having a structure in which a plurality of suction holes are formed on a medium support surface on which the medium is supported, and a plurality of adsorptions An adsorption portion that adsorbs a medium by generating an adsorption pressure of 3.0 kilopascals or more and 11.3 kilopascals or less in the hole, and an adsorption hole is disposed in a medium support area where the medium is supported on the medium support surface.
  • the fifth aspect in double-sided printing in which images are formed on the first side and the second side, it is possible to simultaneously suppress the occurrence of cockling and the occurrence of a cloudy image failure.
  • a sixth aspect includes a temperature condition setting unit that sets a temperature condition of the drying unit in the image forming apparatus of the fifth aspect, and the temperature condition setting unit is a temperature condition of 80 ° C. or more and 100 ° C. or less as the temperature condition of the drying unit. It is good also as a structure which sets.
  • the temperature condition of the drying section can be set to 80 ° C. or more and 100 ° C. or less.
  • An image forming apparatus includes an image forming unit that forms an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image using the image forming unit.
  • a drying unit that performs a drying process on the medium on which the image is formed. In the drying unit to which a temperature condition of 80 ° C. or more and 110 ° C. or less is applied, and in the drying processing region in the drying unit, an image is formed using the image forming unit.
  • a drying conveyance unit that conveys the formed medium in the medium conveyance direction, and includes a drying conveyance unit including a conveyance belt having a structure in which a plurality of suction holes are formed on a medium support surface on which the medium is supported, and a plurality of adsorptions
  • An adsorption portion that adsorbs a medium by generating an adsorption pressure of 3.0 kilopascals or more and 11.3 kilopascals or less in the hole, and an adsorption hole is disposed in a medium support area where the medium is supported on the medium support surface.
  • Non-hole placement area not A fluororesin film having an arithmetic average surface roughness of 2.0 micrometers to 6.0 micrometers and a static contact angle with respect to ink of 83.9 degrees to 90.5 degrees is formed.
  • the seventh aspect even when the temperature condition of the drying section is 80 ° C. or higher and 110 ° C. or lower, it is possible to obtain the same effect as that of the fifth aspect.
  • the eighth aspect includes a temperature condition setting unit that sets a temperature condition of the drying unit in the image forming apparatus of the seventh aspect, and the temperature condition setting unit is a temperature condition of 80 ° C. or more and 110 ° C. or less as the temperature condition of the drying unit. It is good also as a structure which sets.
  • the temperature condition of the drying section can be 80 ° C. or higher and 110 ° C. or lower.
  • the ninth aspect may be configured such that in the image forming apparatus according to any one of the first aspect to the eighth aspect, a medium supply unit that supplies a sheet as a medium to the image forming unit is provided.
  • the image forming unit includes an inkjet head in which a plurality of nozzle openings for ejecting ink are formed on a liquid ejection surface. It is good.
  • the eleventh aspect may be configured such that, in the image forming apparatus according to any one of the first aspect to the tenth aspect, the ink is a water-based ink.
  • the ink is a sticky or elastic polymer component caused by heating, and the sticky due to heating. Or it is good also as a structure containing at least any one of the adhesion component which elasticity produces.
  • the thirteenth aspect may be configured such that in the image forming apparatus according to any one of the first to twelfth aspects, the ink includes black ink containing colorant particles representing black.
  • the thirteenth aspect in double-sided printing using black ink, it is possible to simultaneously suppress the occurrence of cockling and the occurrence of image failure.
  • An image using black ink is easier to visually recognize an image failure than other color inks. Therefore, even in double-sided printing using a color ink that is less likely to be visually recognized than black ink, It is possible to simultaneously suppress the occurrence of a ring and the occurrence of an image failure.
  • the drying conveyance unit is a gripper that grips the leading end of the medium in the medium conveyance direction, and a gripper support member that supports the gripper.
  • the gripper support member disposed at a distance less than the total length of the medium in the medium transport direction between the medium support surface and the gripper supported by using the gripper support member are moved in a direction parallel to the medium transport direction. It is good also as a structure provided with the gripper moving part to be made.
  • a belt moving unit that moves the conveying belt in the medium conveying direction and an operation of the belt moving unit are controlled to synchronize with the movement of the gripper in the medium conveying direction, and the conveying belt is moved in the medium conveying direction. It is good also as a structure provided with the belt movement control part to move.
  • the front end is gripped using the gripper and the non-tip end is supported using the transport belt, and in duplex printing when the gripper and the transport belt move synchronously, It is possible to simultaneously suppress the occurrence of cockling and the occurrence of image failure.
  • An image forming method includes an image forming step of forming an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image is formed in the image forming step.
  • a drying process in which a drying process is performed on the processed medium, a drying process in which a temperature condition of 80 ° C. or more and 140 ° C. or less is applied, and a plurality of media support surfaces on which a medium is supported in a drying process region in the drying process.
  • the suction holes are 3.0 kilopascals or more.
  • the drying conveyance step and the adsorption step include an adsorption in a medium support area on which the medium is supported on the medium support surface.
  • the arithmetic average surface roughness is 0.83 micrometers or more and 6.0 micrometers or less, and the static contact angle to the ink is 83.5 degrees or more and 90.5.
  • the same matters as those specified in the second aspect and the ninth to thirteenth aspects can be appropriately combined.
  • the components responsible for the processes and functions specified in the image forming apparatus can be grasped as the components of the image forming method responsible for the processes and functions corresponding thereto.
  • An image forming method includes an image forming step of forming an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image is formed in the image forming step.
  • a drying process in which a drying process is performed on the processed medium, a drying process in which a temperature condition of 80 ° C. or more and 160 ° C. or less is applied, and a plurality of media support surfaces on which a medium is supported in a drying process region in the drying process.
  • the suction holes are 3.0 kilopascals or more.
  • the drying conveyance step and the adsorption step include an adsorption in a medium support area on which the medium is supported on the medium support surface.
  • the arithmetic average surface roughness is 2.0 micrometers or more and 6.0 micrometers or less, and the static contact angle with respect to the ink is 83.9 degrees or more and 90.5.
  • matters similar to the matters specified in the fourth aspect and the ninth to thirteenth aspects can be appropriately combined.
  • the components responsible for the processes and functions specified in the image forming apparatus can be grasped as the components of the image forming method responsible for the processes and functions corresponding thereto.
  • An image forming method includes an image forming step of forming an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image is formed in the image forming step.
  • a drying process in which a drying process is performed on the obtained medium, a drying process in which a temperature condition of 80 ° C. or more and 100 ° C. or less is applied, and a plurality of media support surfaces on which a medium is supported in a drying process region in the drying process.
  • the suction holes are 3.0 kilopascals or more.
  • the drying conveyance step and the adsorption step include an adsorption in a medium support area on which the medium is supported on the medium support surface.
  • the non-hole arrangement region where no holes are arranged has an arithmetic average surface roughness of 1.06 micrometers or more and 6.0 micrometers or less, and a static contact angle with respect to ink of 83.5 degrees or more and 90.5.
  • This is an image forming method in which a conveyance belt on which a fluororesin film having a temperature of less than or equal to is used is used.
  • the same matters as those specified in the sixth aspect and the ninth to thirteenth aspects can be appropriately combined.
  • the components responsible for the processes and functions specified in the image forming apparatus can be grasped as the components of the image forming method responsible for the processes and functions corresponding thereto.
  • An image forming method includes an image forming step of forming an image using ink on a first surface of a medium and a second surface opposite to the first surface, and an image is formed in the image forming step.
  • a drying process in which a drying process is performed on the obtained medium, and a plurality of media support surfaces on which a medium is supported are provided in a drying process in which a temperature condition of 80 ° C. or higher and 110 ° C. or lower is applied,
  • the suction holes are 3.0 kilopascals or more.
  • the drying conveyance step and the adsorption step include an adsorption in a medium support area on which the medium is supported on the medium support surface.
  • the arithmetic average surface roughness is 2.0 micrometers or more and 6.0 micrometers or less
  • the static contact angle with respect to the ink is 83.9 degrees or more and 90.5.
  • matters similar to the matters specified in the eighth aspect to the thirteenth aspect can be appropriately combined.
  • the components responsible for the processes and functions specified in the image forming apparatus can be grasped as the components of the image forming method responsible for the processes and functions corresponding thereto.
  • the present invention in double-sided printing in which an image is formed on the first side and the second side, the occurrence of cockling, the occurrence of white image failure, or the occurrence of cloudy image failure is suppressed. Is possible.
  • FIG. 1 is an overall configuration diagram of an inkjet printing apparatus.
  • FIG. 2 is a block diagram showing a schematic configuration of the control system.
  • FIG. 3 is a perspective plan view showing an example of the structure of an inkjet head.
  • FIG. 4 is a perspective view of the head module and includes a partial cross-sectional view.
  • FIG. 5 is a perspective plan view of the liquid ejection surface of the head module.
  • FIG. 6 is a cross-sectional view showing the internal structure of the head module.
  • FIG. 7 is a configuration diagram showing an outline of the ink drying unit.
  • FIG. 8 is a schematic diagram of double-sided printing.
  • FIG. 9 is an explanatory diagram of a fogging failure.
  • FIG. 10 is an explanatory diagram of white spot failure.
  • FIG. 9 is an explanatory diagram of a fogging failure.
  • FIG. 10 is an explanatory diagram of white spot failure.
  • FIG. 9 is an explanatory diagram of a fogging failure.
  • FIG. 11 is a schematic diagram of the experiment.
  • FIG. 12 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 42 ° C.
  • FIG. 13 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 58 ° C.
  • FIG. 14 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 72 ° C.
  • FIG. 15 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 92 ° C.
  • FIG. 16 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 80 ° C.
  • FIG. 17 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 100 ° C.
  • FIG. 18 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 110 ° C.
  • FIG. 19 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 120 ° C.
  • FIG. 20 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 140 ° C.
  • FIG. 21 is a graph showing the surface roughness and contact angle of each test piece when the temperature of the fluororesin film of the test piece is 160 ° C.
  • FIG. 22 is a plan view showing an example of the surface shape of the conveyor belt.
  • FIG. 23 is a plan view showing another example of the surface shape of the conveyor belt.
  • 24 is a schematic diagram of a cross section taken along the line XXIV-XXIV of the test piece shown in FIG.
  • FIG. 1 is an overall configuration diagram illustrating an example of an inkjet printing apparatus 1A to which a drying apparatus according to an embodiment is applied.
  • the ink jet printing apparatus 1A includes a line type ink jet head 46C, an ink jet head 46M, an ink jet head 46Y, and an ink jet head 46K as print heads of the drawing unit 40.
  • the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K use a four-color ink of cyan, magenta, yellow, and black on the sheet P, which is a sheet, and single pass a desired image.
  • This is a single-pass inkjet color digital printing apparatus that prints using a printing method.
  • cyan may be expressed using C.
  • Magenta is sometimes expressed using M.
  • Yellow may be represented using Y.
  • Black may be expressed using K.
  • water-based ink is used as drawing ink.
  • a water-based ink refers to an ink in which a coloring material such as a pigment and a dye is dissolved or dispersed in at least one of water and a solvent soluble in water.
  • the inkjet printing apparatus 1 ⁇ / b> A includes a paper feed unit 10, a treatment liquid application unit 20, a treatment liquid drying unit 30, a drawing unit 40, an ink drying unit 50, and a stacking unit 60.
  • the ink jet printing apparatus 1A corresponds to an example of an image forming apparatus.
  • the paper feeding unit 10 feeds the paper P one by one.
  • the paper feeding unit 10 includes a paper feeding device 12, a feeder board 14, and a paper feeding drum 16.
  • the sheets P are placed on the sheet feed table 12A in a bundled state in which a plurality of sheets are stacked.
  • the type of the paper P is not particularly limited.
  • printing paper mainly composed of cellulose, such as high-quality paper, coated paper, and art paper, can be used.
  • the sheet and the paper P correspond to an example of a medium.
  • the paper feeding device 12 takes out the sheets P in a bundled state set on the paper feed tray 12A one by one from the top and feeds them to the feeder board 14.
  • the feeder board 14 conveys the paper P received from the paper feeding device 12 to the paper feeding drum 16.
  • the paper supply unit 10 corresponds to an example of a medium supply unit that supplies a sheet as a medium to the image forming unit.
  • the upper term in the present specification represents a direction having a component in the direction opposite to the direction of gravity. Moreover, the lower term in this specification represents the direction which has a component of a gravitational direction.
  • the paper supply drum 16 receives the paper P fed from the feeder board 14 and conveys the received paper P to the processing liquid application unit 20.
  • the paper supply drum 16 includes a gripper 17 that holds the leading end of the paper P.
  • the leading edge of the paper P is an area including the leading edge of the paper P.
  • the leading edge of the paper P is an area having a predetermined length from the leading edge of the paper P in the conveyance direction of the paper P.
  • the predetermined length is appropriately determined based on conditions such as the size of the paper P.
  • the gripper 17 includes a plurality of gripping claws.
  • the illustration of the plurality of gripping claws is omitted.
  • the plurality of gripping claws are arranged along a direction parallel to the rotation axis of the paper supply drum 16.
  • parallel in this specification includes a substantial parallel that intersects but can obtain the same effect as parallel.
  • orthogonality in this specification includes substantial orthogonality that intersects at an angle of less than 90 degrees or greater than 90 degrees, but can obtain the same effect as the orthogonality.
  • the plurality of gripping claws are swingably supported using a claw support portion (not shown).
  • the plurality of gripping claws grip the leading end portion of the paper P between the claw base (not shown).
  • the paper feed drum 16 conveys the paper P wrapped around the peripheral surface due to the gripper 17 being used to grip and rotate the leading end of the paper P.
  • the processing liquid application unit 20 applies the processing liquid to the paper P.
  • the treatment liquid is a liquid having a function of aggregating, insolubilizing or thickening the color material component in the ink.
  • the treatment liquid application unit 20 includes a treatment liquid application drum 22 and a treatment liquid application device 24.
  • the processing liquid coating drum 22 receives the paper P from the paper supply drum 16 and conveys the received paper P to the processing liquid drying unit 30.
  • the treatment liquid coating drum 22 includes a gripper 23 on the peripheral surface.
  • the treatment liquid coating drum 22 conveys the paper P wound around the circumferential surface due to the gripper 23 being used to grip and rotate the leading end of the paper P.
  • the gripper 23 can have the same configuration as the gripper 17. A detailed description of the gripper 23 is omitted.
  • the processing liquid coating device 24 applies the processing liquid to the paper P conveyed using the processing liquid coating drum 22.
  • the treatment liquid is applied using a roller.
  • the method of applying the treatment liquid is not limited to the roller application method. Other methods may be applied to the treatment liquid coating apparatus 24. Examples of other systems for the treatment liquid coating apparatus 24 include coating using a blade, ejection using an inkjet system, and spraying using a spray system.
  • the processing liquid drying unit 30 performs a drying process on the paper P coated with the processing liquid.
  • the treatment liquid drying unit 30 includes a treatment liquid drying drum 32 and a hot air blower 34.
  • the treatment liquid drying drum 32 receives the paper P from the treatment liquid application drum 22 and conveys the received paper P to the drawing unit 40.
  • the treatment liquid drying drum 32 includes a gripper 33 on the peripheral surface. The treatment liquid drying drum 32 conveys the paper P due to the gripper 33 being used to grip and rotate the leading edge of the paper P.
  • a configuration similar to that of the gripper 17 can be applied to the gripper 33.
  • a detailed description of the gripper 33 is omitted.
  • the hot air blower 34 is installed inside the processing liquid drying drum 32.
  • the hot air blower 34 blows hot air on the paper P conveyed using the processing liquid drying drum 32 to dry the processing liquid.
  • the drawing unit 40 includes a drawing drum 42, a head unit 44, and an image reading device 48.
  • the drawing drum 42 receives the paper P from the processing liquid drying drum 32 and conveys the received paper P to the ink drying unit 50.
  • the drawing drum 42 includes a gripper 43 on the peripheral surface. The drawing drum 42 wraps and conveys the sheet P around the circumferential surface due to the gripper 43 being used to grip and rotate the leading end of the sheet P.
  • the drawing drum 42 includes a suction mechanism (not shown).
  • the drawing drum 42 transports the paper P wound around the peripheral surface while adsorbing the paper P onto the peripheral surface. A negative pressure is used for the adsorption.
  • the drawing drum 42 has a plurality of suction holes on the peripheral surface. The illustration of the plurality of suction holes is omitted. The drawing drum 42 sucks the paper P onto the peripheral surface of the drawing drum 42 due to suction from the inside of the drawing drum 42 through the plurality of suction holes.
  • the head unit 44 includes an inkjet head 46C, an inkjet head 46M, an inkjet head 46Y, and an inkjet head 46K.
  • the inkjet head 46C is a liquid ejection head that ejects cyan ink droplets.
  • the inkjet head 46M is a liquid ejection head that ejects magenta ink droplets.
  • the inkjet head 46Y is a liquid ejection head that ejects yellow ink droplets.
  • the inkjet head 46K is a liquid ejection head that ejects black ink droplets. Note that the term “liquid ejection head” in this specification is synonymous with the term “inkjet head”.
  • Ink is supplied to each of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K from an ink tank (not shown) that is an ink supply source of a corresponding color via a piping path (not shown). .
  • Each of the ink jet head 46C, the ink jet head 46M, the ink jet head 46Y, and the ink jet head 46K causes a printable line due to one scan of the paper P conveyed using the drawing drum 42. Mold head.
  • Each of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K is a line-type head that can be printed using a single-pass method.
  • each nozzle surface is arranged to face the peripheral surface of the drawing drum 42.
  • the ink jet head 46C, the ink jet head 46M, the ink jet head 46Y, and the ink jet head 46K are arranged at regular intervals along the transport path of the paper P using the drawing drum 42.
  • a plurality of nozzle openings which are ink discharge ports, are two-dimensionally formed on the liquid discharge surfaces of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K. It is arranged.
  • the liquid ejection surface is a surface on which nozzle openings are formed, and is synonymous with terms such as a nozzle surface or a nozzle formation surface.
  • An array of a plurality of nozzle openings arranged two-dimensionally is called a two-dimensional nozzle array.
  • the liquid discharge surface is illustrated with reference numeral 277 in FIG.
  • the nozzle opening is illustrated with reference numeral 280 in FIG.
  • Ink droplets are ejected from at least one of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K toward the paper P conveyed using the drawing drum 42, and the ejected liquid. An image is formed on the paper P due to the droplets adhering to the paper P.
  • the drawing unit 40 including the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K corresponds to an example of an image forming unit.
  • the drawing drum 42 functions as a means for relatively moving the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K and the paper P.
  • the ejection timings of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K are synchronized with a rotary encoder signal obtained from a rotary encoder installed on the drawing drum 42. In FIG. 1, the rotary encoder is not shown.
  • the ejection timing is the timing at which ink droplets are ejected, and is synonymous with the droplet ejection timing.
  • the configuration using four colors of ink of cyan, magenta, yellow, and black is exemplified, but the combination of ink color and number of colors is not limited to this embodiment. If necessary, light ink, dark ink, special color ink, and the like may be added.
  • an inkjet head that ejects light-colored ink such as light cyan or light magenta is added, or a configuration in which an inkjet head that ejects a special color ink such as green or orange is added is also possible.
  • the arrangement order of the ink jet heads for each color is not particularly limited.
  • the image reading device 48 optically reads an image formed on the paper P using the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K.
  • the image reading device 48 is a device that generates electronic image data indicating a read image. Image formation on the paper P is synonymous with image recording on the paper P.
  • the image reading device 48 includes an imaging device that captures an image formed on the paper P and converts it into an electrical signal indicating image information.
  • the image reading device 48 may include an illumination optical system that illuminates a reading target and a signal processing circuit that processes a signal obtained from the imaging device and generates digital image data.
  • the image reading device 48 is preferably configured to read a color image.
  • a color CCD linear image sensor is used as an imaging device.
  • CCD is an abbreviation for Charge-Coupled Device.
  • CCD refers to a charge coupled device.
  • the color CCD linear image sensor is an image sensor in which light receiving elements having color filters of red, green, and blue are arranged in a straight line.
  • R represents red.
  • G represents green.
  • B represents blue.
  • CMOS linear image sensor can be used instead of the color CCD linear image sensor.
  • CMOS is an abbreviation for Complementary / Metal / Oxide / Semiconductor.
  • CMOS refers to a complementary metal oxide semiconductor.
  • the image reading device 48 reads an image formed on the paper P while the paper P is being conveyed by the drawing drum 42.
  • the image reading device 48 installed in the conveyance path of the paper P may be called an inline scanner or an inline sensor.
  • the image reading device 48 may be a camera.
  • the paper P on which an image is formed using at least one of the ink jet head 46C, the ink jet head 46M, the ink jet head 46Y, and the ink jet head 46K passes the image on the paper P when passing through the reading area of the image reading device 48. Is read.
  • a defective nozzle detection pattern for inspecting the ejection state of each nozzle in addition to the user image to be printed specified in the print job, a test pattern for print density correction, and print density unevenness correction Test patterns and other various test patterns may be included.
  • the print image is inspected based on the read image data read by the image reading device 48, and it is determined whether there is an image quality abnormality. Further, based on the data of the read image read using the image reading device 48, information such as image density and ejection failure of the ink jet head 46C, the ink jet head 46M, the ink jet head 46Y, and the ink jet head 46K is obtained.
  • the ink drying unit 50 uses the drawing unit 40 to dry the paper P on which an image is formed.
  • the ink drying unit 50 includes a chain gripper 70, a paper guide 80, and a heat drying processing unit 90.
  • the chain gripper 70 receives the paper P from the drawing drum 42 and conveys the received paper P to the stacking unit 60.
  • the chain gripper 70 includes a pair of endless chains 72 that travel on a prescribed travel route.
  • the chain gripper 70 grips the leading end portion of the paper P using the grippers 74 provided in the pair of chains 72 and transports the paper P along a specified transport path.
  • a plurality of grippers 74 are provided in the chain 72 at regular intervals.
  • the chain gripper 70 of this example includes a first sprocket 71A, a second sprocket 71B, a chain 72, and a plurality of grippers 74.
  • the chain gripper 70 has a structure in which a pair of endless chains 72 are wound around a pair of first sprockets 71A and a second sprocket 71B. In FIG. 1, only one of the pair of first sprocket 71A, second sprocket 71B, and pair of chains 72 is shown.
  • the pair of first sprocket 71A, the second sprocket 71B, and the pair of chains 72 correspond to an example of a gripper moving unit that moves a gripper supported using a gripper support member in a direction parallel to the medium conveyance direction.
  • the gripper moving unit may include a motor, a gear, and the like that drive the pair of first sprockets 71A or the second sprocket 71B.
  • the chain gripper 70 has a structure in which a plurality of grippers 74 are arranged at a plurality of positions in the feed direction of the chain 72.
  • the gripper 74 is supported using a gripper support member (not shown).
  • the gripper support members are arranged at a distance less than the total length of the paper P in the feed direction of the chain 72.
  • the feed direction of the chain 72 corresponds to the medium conveyance direction in the chain gripper 70.
  • the transport path of the paper P using the chain gripper 70 includes a horizontal transport area for transporting the paper P along the horizontal direction, and an inclined transport area for transporting the paper P obliquely upward from the end of the horizontal transport area.
  • region is called a 1st conveyance area
  • region is called a 2nd conveyance area.
  • the paper guide 80 is a mechanism for guiding the conveyance of the paper P using the chain gripper 70.
  • the paper guide 80 includes a first paper guide 82 and a second paper guide 84.
  • the first paper guide 82 guides the paper P conveyed in the first conveyance section of the chain gripper 70.
  • the second paper guide 84 guides the paper P that is transported in the second transport section subsequent to the first transport section.
  • the suction belt conveyance device is a device that conveys the paper P due to the conveyance belt being fed in a state where the paper P is attracted to the endless conveyance belt.
  • the heat drying processing unit 90 applies heat to the paper P on which an image is formed using the drawing unit 40 to evaporate the solvent of the ink, thereby drying the paper P.
  • An example of the heat drying processing unit 90 is a warm air blowing unit.
  • the hot air blowing unit is disposed to face the first paper guide 82 and blows hot air on the paper P conveyed using the chain gripper 70.
  • the stacking unit 60 includes a stacking device 62 that receives and stacks the paper P conveyed from the ink drying unit 50 using the chain gripper 70.
  • the chain gripper 70 releases the paper P at a predetermined accumulation position.
  • the stacking device 62 includes a stacking tray 62A. The stacking device 62 receives the paper P released from the chain gripper 70 and stacks it in a bundle on the stacking tray 62A.
  • the ink jet printing apparatus 1A shown in FIG. 1 can be used as a double-sided printing machine that forms images on both sides of a sheet P.
  • the ink jet printing apparatus 1A may include a paper reversing unit (not shown) that automatically reverses the first surface and the second surface of the paper P.
  • the inkjet printing apparatus 1A may include a double-sided printing paper transport unit that transports the paper P having the first surface and the second surface automatically reversed from the stacking tray 62A to the paper feed tray 12A.
  • the paper reversing unit and the double-sided printing paper transport unit may be configured integrally.
  • FIG. 2 is a block diagram showing a schematic configuration of the control system.
  • the inkjet printing apparatus 1 ⁇ / b> A includes a system controller 100.
  • the system controller 100 includes a CPU 100A, a ROM 100B, and a RAM 100C.
  • ROM 100B and the RAM 100C illustrated in FIG. CPU is an abbreviation for Central Processing Unit.
  • ROM is an abbreviation for Read Only Memory.
  • RAM is an abbreviation for Random Access Memory.
  • the system controller 100 functions as an overall control unit that comprehensively controls each unit of the inkjet printing apparatus 1A. Further, the system controller 100 functions as an arithmetic unit that performs various arithmetic processes. The system controller 100 may control each unit of the inkjet printing apparatus 1A by executing a program.
  • system controller 100 functions as a memory controller that controls reading and writing of data in memories such as the ROM 100B and the RAM 100C.
  • the inkjet printing apparatus 1A includes a communication unit 102, an image memory 104, a conveyance control unit 110, a paper feed control unit 112, a processing liquid application control unit 114, a processing liquid drying control unit 116, a drawing control unit 118, an ink drying control unit 120, And an integration control unit 124.
  • the communication unit 102 includes a communication interface (not shown).
  • the communication unit 102 can transmit and receive data to and from the host computer 103 connected to the communication interface.
  • the image memory 104 functions as a temporary storage unit for various data including image data.
  • the image memory 104 reads and writes data through the system controller 100. Image data captured from the host computer 103 via the communication unit 102 is temporarily stored in the image memory 104.
  • the conveyance control unit 110 controls the operation of the conveyance unit 11 of the paper P in the inkjet printing apparatus 1 ⁇ / b> A according to a command from the system controller 100.
  • the transport unit 11 illustrated in FIG. 2 includes the processing liquid coating drum 22, the processing liquid drying drum 32, the drawing drum 42, and the chain gripper 70 illustrated in FIG.
  • the paper feed control unit 112 shown in FIG. 2 operates the paper feed unit 10 in response to a command from the system controller 100.
  • the paper feed control unit 112 controls the paper P supply start operation, the paper P supply stop operation, and the like.
  • the processing liquid application control unit 114 operates the processing liquid application unit 20 in response to a command from the system controller 100.
  • the treatment liquid application control unit 114 controls the application amount and application timing of the process liquid.
  • the processing liquid drying control unit 116 operates the processing liquid drying unit 30 in response to a command from the system controller 100.
  • the treatment liquid drying control unit 116 controls the drying temperature, the flow rate of the dry gas, the injection timing of the dry gas, and the like.
  • the drawing control unit 118 controls the operation of the drawing unit 40 in response to a command from the system controller 100. That is, the drawing control unit 118 controls ink ejection of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K illustrated in FIG.
  • the drawing control unit 118 includes an image processing unit (not shown).
  • the image processing unit forms dot data from the input image data.
  • the image processing unit includes a color separation processing unit, a color conversion processing unit, a correction processing unit, and a halftone processing unit (not shown).
  • the color separation processing unit performs color separation processing on the input image data.
  • the input image data is expressed in RGB
  • the input image data is decomposed into data for each of R, G, and B colors.
  • R represents red.
  • G represents green.
  • B represents blue.
  • the color conversion processing unit converts image data for each color separated into red, green, and blue into cyan, magenta, yellow, and black corresponding to the ink color.
  • the correction processing unit performs correction processing on the image data for each color converted into cyan, magenta, yellow, and black.
  • Examples of the correction processing include gamma correction processing, density unevenness correction processing, abnormal recording element correction processing, and the like.
  • image data represented by a multi-gradation number such as 0 to 255 is converted into dot data represented by a binary or multi-value of three or more values less than the number of gradations of the input image data. Converted.
  • predetermined halftone processing rules are applied.
  • Examples of the halftone processing rule include a dither method or an error diffusion method.
  • the halftone processing rule may be changed according to the image forming conditions, the contents of the image data, or the like.
  • the drawing control unit 118 includes a waveform generation unit, a waveform storage unit, and a drive circuit (not shown).
  • the waveform generator generates a drive voltage waveform.
  • the waveform storage unit stores the waveform of the drive voltage.
  • the drive circuit generates a drive voltage having a drive waveform corresponding to the dot data.
  • the drive circuit supplies drive voltage to the inkjet head 46C, inkjet head 46M, inkjet head 46Y, and inkjet head 46K shown in FIG.
  • the ejection timing and the ink ejection amount at each pixel position are determined, the ejection timing at each pixel position, the drive voltage corresponding to the ink ejection amount, A control signal for determining the ejection timing of each pixel is generated, this drive voltage is supplied to the inkjet head, and dots are formed using the ink ejected from the inkjet head.
  • the ink drying control unit 120 operates the ink drying unit 50 in response to a command from the system controller 100.
  • the ink drying control unit 120 controls the drying gas temperature, the flow rate of the drying gas, or the ejection timing of the drying gas.
  • the ink drying control unit 120 controls the operation of the suction belt conveyance device provided in the ink drying unit 50.
  • the suction belt conveyance device is illustrated with reference numeral 302 in FIG.
  • the ink drying control unit 120 corresponds to an example of a belt movement control unit that controls the operation of the belt moving unit and moves the conveyance belt in the medium conveyance direction in synchronization with the movement of the gripper in the medium conveyance direction.
  • the accumulation control unit 124 operates the accumulation unit 60 in response to a command from the system controller 100.
  • the stacking control unit 124 controls the operation of the lifting mechanism according to the increase or decrease of the paper P when the stacking tray 62A shown in FIG.
  • the pressure control unit 126 controls the operation of the pressure generation unit 128 according to a command from the system controller 100.
  • a vacuum pump can be applied to the pressure generating unit 128.
  • the pressure generator 128 is connected to a suction hole formed on the peripheral surface of the drawing drum 42 via a vacuum channel inside the drawing drum 42 shown in FIG.
  • the pressure generator 128 shown in FIG. 2 is connected to the suction hole formed on the first surface of the transport belt through the vacuum flow path inside the transport belt constituting the first paper guide 82 shown in FIG. Is done.
  • the pressure control unit 126 shown in FIG. 2 operates the pressure generation unit 128 based on the adsorption pressure of the paper P set using the pressure setting unit 140, and is supported by the drawing drum 42 shown in FIG. The adsorption pressure of P is controlled.
  • the pressure control unit 126 shown in FIG. 2 operates the pressure generating unit 128 based on the adsorption pressure of the paper P set using the pressure setting unit 140, and constitutes the first paper guide 82 shown in FIG. The suction pressure of the paper P supported by the transport belt is controlled.
  • FIG. 2 the pressure generating unit that generates the suction pressure of the paper P supported by the drawing drum 42 illustrated in FIG. 1 and the pressure generation unit that generates the suction pressure of the paper P supported by the first paper guide 82 are illustrated. Collectively, the pressure generator 128 is illustrated.
  • the pressure control unit 126 shown in FIG. 2 is supported by the first pressure control unit that controls the adsorption pressure of the paper P supported by the drawing drum 42 shown in FIG.
  • a second pressure control unit that controls the suction pressure of the sheet P to be printed may be provided.
  • the first pressure control unit may be included in the transport control unit 110.
  • the second pressure control unit may be included in the ink drying control unit 120.
  • 2A includes an operation unit 130, a display unit 132, a parameter storage unit 134, and a program storage unit 136.
  • the operation unit 130 includes operation members such as operation buttons, a keyboard, or a touch panel.
  • the operation unit 130 may include a plurality of types of operation members. The illustration of the operation member is omitted.
  • Information input via the operation unit 130 is sent to the system controller 100.
  • the system controller 100 executes various processes in accordance with information sent from the operation unit 130.
  • the display unit 132 includes a display device such as a liquid crystal panel and a display driver. Illustration of the display device and the display driver is omitted. In response to a command from the system controller 100, the display unit 132 causes the display device to display various information such as various setting information of the device or abnormality information.
  • the parameter storage unit 134 stores various parameters used in the inkjet printing apparatus 1A. Various parameters stored in the parameter storage unit 134 are read out via the system controller 100 and set in each unit of the apparatus.
  • the program storage unit 136 stores a program used for each unit of the inkjet printing apparatus 1A. Various programs stored in the program storage unit 136 are read out via the system controller 100 and executed in each unit of the apparatus.
  • the pressure setting unit 140 sends out the pressure setting value input using the operation unit 130 or the pressure setting value read from the parameter storage unit 134 to the pressure control unit 126 via the system controller 100.
  • the temperature setting unit 142 receives the temperature setting value input using the operation unit 130 via the system controller 100 or the temperature setting value read from the parameter storage unit 134, or the drying process liquid 120. The data is sent to the control unit 116.
  • the temperature setting unit 142 corresponds to an example of a temperature condition setting unit that sets the temperature condition of the drying unit.
  • the temperature sensor 144 shown in FIG. 2 is a collective illustration of a plurality of temperature sensors arranged in each part of the apparatus.
  • Temperature information detected using the temperature sensor 144 is sent to the processing liquid drying control unit 116 and the ink drying control unit 120 via the system controller 100.
  • the processing liquid drying control unit 116 controls the operation of the processing liquid drying unit 30 based on the temperature setting value and the temperature information.
  • the ink drying control unit 120 controls the operation of the ink drying unit 50 based on the temperature setting value and the temperature information.
  • Fig. 2 lists each part for each function. Each part shown in FIG. 2 can be appropriately integrated, separated, combined, or omitted. Further, each unit shown in FIG. 2 can be configured by appropriately combining hardware and software.
  • FIG. 3 is a perspective plan view showing an example of the structure of an inkjet head.
  • the ink jet head 46 shown in FIG. 3 has a structure in which a plurality of head modules 200 are connected in the width direction of the paper P, which is a direction orthogonal to the transport direction of the paper P.
  • FIG. 3 is an arbitrary one of the inkjet head 46C, the inkjet head 46M, the inkjet head 46Y, and the inkjet head 46K illustrated in FIG.
  • the width direction of the paper P is illustrated using an arrow line with a symbol X.
  • the transport direction of the paper P is illustrated using an arrow line with a symbol Y.
  • a line-type inkjet head in which a plurality of nozzle portions are arranged over a length equal to or longer than the total length Lmax of the paper P in the width direction of the paper P.
  • the inkjet head 46 shown in FIG. A line-type inkjet head is synonymous with a line head and a line-type head.
  • a nozzle portion not shown in FIG. 3 is shown in FIG.
  • the same structure can be applied to the plurality of head modules 200 constituting the inkjet head 46. Further, the head module 200 can function as an ink jet head alone. In addition, although the same term in this specification has a different point, the substantially same which can acquire the same effect is included.
  • the ink-jet head 46 is a line type having nozzle rows that can record an image with a specified recording resolution in a single scan over the entire recording area of the paper P with respect to the width direction of the paper P perpendicular to the conveyance direction of the paper P. It is an inkjet head. Such an ink jet head is also called a full line type head or a page wide head.
  • the prescribed recording resolution may be a recording resolution predetermined in the ink jet printing apparatus 1A, or may be a recording resolution set by a user's selection or automatic selection by a program corresponding to a printing mode. Good.
  • the recording resolution can be, for example, 1200 dots per inch.
  • the dot per inch which is the unit notation of resolution, may be expressed as dpi.
  • dpi means dot per inch.
  • the dot per inch is a unit notation representing the number of dots per inch. One inch is 25.4 millimeters.
  • the transport direction of the paper P may be referred to as a paper transport direction, a medium transport direction, or a transport direction.
  • the width direction of the paper P may be referred to as a paper width direction, a medium width direction, or a width direction.
  • FIG. 4 is a perspective view of the head module including a partial cross-sectional view.
  • the head module 200 has an ink supply unit including an ink supply chamber 232 and an ink circulation chamber 236 on the upper surface side in FIG. 4, which is the opposite side of the liquid ejection surface 277 of the nozzle plate 275.
  • the ink supply chamber 232 is connected to an ink tank (not shown) via a supply-side individual flow path 252, and the ink circulation chamber 236 is connected to a recovery tank (not shown) via a recovery-side individual flow path 256.
  • FIG. 5 is a perspective plan view of the liquid ejection surface of the head module.
  • the number of nozzle openings 280 arranged on the liquid discharge surface 277 is omitted, but a two-dimensional arrangement is applied to the liquid discharge surface 277 of one head module 200 to form a plurality of nozzle openings. 280 is arranged.
  • the head module 200 has an end face on the long side along the V direction having an inclination of an angle ⁇ with respect to a direction orthogonal to the conveyance direction of the paper P, and a W having an inclination of an angle ⁇ with respect to the conveyance direction of the paper P.
  • a parallelogram planar shape having an end surface on the short side along the direction, and a plurality of nozzle openings 280 are arranged in a matrix in the row direction along the V direction and the column direction along the W direction. .
  • the arrangement of the nozzle openings 280 is not limited to the mode illustrated in FIG. 5, and is oblique to the row direction along the direction perpendicular to the conveyance direction of the paper P and the width direction of the paper P perpendicular to the conveyance direction of the paper P.
  • a plurality of nozzle openings 280 may be arranged along the column direction intersecting with the.
  • the projected nozzle array obtained by orthogonally projecting each nozzle portion in the two-dimensional nozzle array has a nozzle density that achieves the maximum recording resolution in the nozzle array direction, and the nozzles are approximately equally spaced. It can be considered that it is equivalent to a single nozzle row arranged in a row.
  • the orthogonal projection is a projection in which the nozzle portions are arranged along the nozzle row direction.
  • “Almost equal intervals” means substantially equal intervals as droplet ejection points that can be recorded by an inkjet printing apparatus.
  • the concept of equal spacing may be used if the spacing is slightly different in consideration of manufacturing errors and / or movement of droplets on the medium due to landing interference. included.
  • the projection nozzle row corresponds to a substantial nozzle row. Considering the projection nozzle row, it is possible to associate a nozzle number representing the nozzle position with each nozzle in the arrangement order of the projection nozzles arranged along the nozzle row direction.
  • the nozzle array form in the inkjet head 46 is not limited, and various nozzle array forms can be employed. For example, instead of a matrix-like two-dimensional array, a linear array of lines, a V-shaped nozzle array, a polygonal nozzle array such as a W-shape with a V-shaped array as a repeating unit, and the like are also possible. It is.
  • FIG. 6 is a cross-sectional view showing the internal structure of the inkjet head.
  • Reference numeral 214 is an ink supply path
  • reference numeral 218 is a pressure chamber
  • reference numeral 216 is an individual supply path that connects each pressure chamber 218 and the ink supply path 214
  • reference numeral 220 is a nozzle communication path that connects the pressure chamber 218 to the nozzle opening 280, and reference numeral 226.
  • the pressure chamber 218 may be referred to as a liquid chamber.
  • the vibration plate 266 is provided on the flow path structure 210 that forms the ink supply path 214, the individual supply path 216, the pressure chamber 218, the nozzle communication path 220, the circulation individual flow path 226, and the circulation common flow path 228.
  • a piezoelectric element 230 having a laminated structure of a lower electrode 265, a piezoelectric layer 231, and an upper electrode 264 is disposed on the vibration plate 266 via an adhesive layer 267.
  • the lower electrode 265 may be referred to as a common electrode, and the upper electrode 264 may be referred to as an individual electrode.
  • the upper electrode 264 is an individual electrode patterned according to the shape of each pressure chamber 218, and a piezoelectric element 230 is provided for each pressure chamber 218.
  • the ink supply path 214 is connected to the ink supply chamber 232 shown in FIG. 4, and ink is supplied from the ink supply path 214 shown in FIG. 6 to the pressure chamber 218 via the individual supply path 216.
  • the piezoelectric element 230 and the diaphragm 266 are deformed due to the application of a driving voltage to the upper electrode 264 of the piezoelectric element 230 provided in the corresponding pressure chamber 218.
  • the volume changes, and ink is ejected from the nozzle opening 280 via the nozzle communication path 220 due to a pressure change accompanying this.
  • Ink can be ejected from the nozzle openings 280 due to controlling the driving of the piezoelectric elements 230 corresponding to the respective nozzle openings 280 according to the dot arrangement data generated from the input image data.
  • the ink ejection timing from each nozzle opening 280 is controlled in accordance with the transport speed, so that a desired image is formed on the paper P. Can be formed.
  • the pressure chamber 218 provided corresponding to each nozzle opening 280 has a substantially square planar shape, and an outlet to the nozzle opening 280 is provided at one of the diagonal corners, and the other is provided at the other.
  • An individual supply path 216 serving as an inlet for the supply ink is provided. Illustration of the planar shape of the pressure chamber 218 is omitted.
  • planar shape of the pressure chamber is not limited to a square.
  • the planar shape of the pressure chamber may have various forms such as a rhombus, a quadrangle such as a rectangle, a pentagon, a hexagon and other polygons, a circle, and an ellipse.
  • a circulation outlet is formed in the nozzle portion 281 including the nozzle opening 280 and the nozzle communication path 220, and the nozzle portion 281 communicates with the circulation individual flow path 226 via the circulation outlet.
  • ink that is not used for droplet ejection is collected into the circulation common flow path 228 via the circulation individual flow path 226.
  • the circulation common flow path 228 is connected to the ink circulation chamber 236 shown in FIG. 4, and the ink is always collected to the circulation common flow path 228 through the circulation individual flow path 226. The thickening of the ink in the vicinity of the nozzle opening 280 at the time of dropping is prevented.
  • a flow path such as a pressure chamber 218 communicated with one nozzle portion 281, and a piezoelectric element 230 corresponding to the nozzle portion 281 are included. Can be mentioned.
  • the nozzle portion represents a concept including a nozzle opening.
  • the terms “nozzle opening” and “nozzle part” can be appropriately replaced.
  • the piezoelectric element 230 there is a piezoelectric element 230 having a structure separated individually corresponding to the nozzle portion 281.
  • a structure in which the piezoelectric layer 231 is integrally formed with respect to the plurality of nozzle portions 281, individual electrodes are formed corresponding to the respective nozzle portions 281, and an active region is formed for each nozzle portion 281 is applied. Also good.
  • a heater is provided in the pressure chamber 218 as a pressure generating element instead of a piezoelectric element, and a drive voltage is supplied to the heater to generate heat, and ink in the pressure chamber 218 is ejected from the nozzle opening 280 using a film boiling phenomenon.
  • a thermal method may be applied.
  • FIG. 7 is a configuration diagram showing an outline of the ink drying unit.
  • the image reading device 48, the first sprocket 71A, and the second sprocket 71B are not shown for simplification.
  • the drying device 300 applied to the ink drying unit 50 includes a heat drying processing unit 90 and an adsorption belt conveyance device 302.
  • the suction belt conveyance device 302 is disposed in the drying processing area of the heat drying processing unit 90.
  • the suction belt conveyance device 302 includes a conveyance belt 310, a driving roller 312, a driven roller 314, and a suction chamber 316.
  • the suction belt conveyance device 302 corresponds to an example of a dry conveyance unit.
  • the driving roller 312 and the driven roller 314 correspond to an example of a belt moving unit.
  • the conveyance belt 310 is an endless belt.
  • the conveyor belt 310 is wound between the driving roller 312 and the driven roller 314.
  • the conveyance belt 310 may be simply referred to as a belt.
  • the belt surface facing the outside of the conveying belt 310 wound around the driving roller 312 and the driven roller 314 is referred to as a first surface of the conveying belt 310.
  • the first surface of the conveyance belt 310 can be a paper support surface that can come into contact with the paper P.
  • a surface opposite to the first surface of the conveyor belt 310, that is, a belt surface facing the inside of the conveyor belt 310 wound around the driving roller 312 and the driven roller 314 is referred to as a second surface of the conveyor belt 310.
  • the first surface of the conveyance belt 310 is provided with a suction hole (not shown in FIG. 7) in a paper support area that is an area for supporting the paper P.
  • the suction holes are illustrated with reference numeral 311 in FIG.
  • the non-arrangement region of the suction holes on the first surface of the conveyor belt 310 is coated with a fluororesin.
  • the first surface of the conveyor belt 310 corresponds to an example of a medium support surface.
  • the non-arrangement region of the suction holes includes a portion that forms the periphery of the suction holes in the paper support region and contacts the paper P.
  • the non-arrangement region of the suction holes on the first surface of the conveyor belt 310 is covered with a fluororesin film.
  • first surface of the conveyor belt 310 represents a fluororesin film on the first surface of the conveyor belt 310.
  • the paper support area corresponds to an example of a medium support area.
  • the non-arrangement area of the suction holes corresponds to an example of the non-hole arrangement area.
  • the suction chamber 316 is disposed on the second surface side of the conveyor belt 310. In other words, the suction chamber 316 is disposed on the back side of the transport belt 310.
  • the suction chamber 316 is connected to the pressure generator 128 shown in FIG.
  • the sheet P is caused by sucking air from the suction chamber 316 using the pressure generation unit 128 to make the inside of the suction chamber 316 negative pressure and sucking air from a suction hole not shown in FIG. Air pressure acts and is attracted to the first surface of the conveyor belt 310.
  • the suction chamber 316 corresponds to an example of an adsorption unit.
  • the paper P on which an image is formed using the drawing unit 40 is transferred from the drawing drum 42 to the chain gripper 70.
  • the paper P delivered to the chain gripper 70 is placed on the transport belt 310 and adsorbed to the transport belt 310 with the leading end gripped by the gripper 74.
  • the chain gripper 70 corresponds to an example of a gripper moving unit.
  • the chain gripper 70 conveys the gripper 74 in synchronization with the rotation speed of the drawing drum 42.
  • the drive roller 312 is rotationally driven so that the conveyor belt 310 travels in accordance with the feed speed of the gripper 74 by the chain gripper 70.
  • the conveyor belt 310 is fed at approximately the same speed as the gripper 74.
  • the feed speed of the conveyor belt 310 and the feed speed of the gripper 74 do not necessarily need to be completely matched, and there may be a slight speed difference.
  • the speed difference between the conveyor belt 310 and the gripper 74 may be different. If the speed of the transport belt 310 is slightly slower than the speed of the gripper 74, the paper P can be transported while applying a pulling force. Conversely, when the speed of the transport belt 310 becomes faster than the speed of the gripper 74, the transport belt 310 advances while pushing the paper P in the transport direction.
  • the conveyance belt 310 has a belt length that can adsorb a plurality of sheets P at the same time.
  • the conveyance belt 310 shown in FIG. 2 has a belt length that can adsorb two sheets of paper P at the same time, but the belt length of the conveyance belt 310 can be designed as appropriate, and three sheets at the same time. A form capable of adsorbing the above paper P is also possible.
  • FIG. 8 is a schematic diagram of double-sided printing. In the double-sided printing method shown in FIG. 8, each process proceeds from right to left.
  • FIG. 8 illustrates, from the right, a first surface drawing process, a first surface ink drying process, a paper reversing process, a second surface drawing process, a second surface ink drying process, and an accumulation process.
  • an image having a blue stripe pattern is formed on the first surface of the paper P using the head unit 44.
  • any image can be applied to the image formed on the paper P in the first surface drawing process.
  • the leading edge of the paper P may be gripped using the gripper 43 shown in FIG. At that time, in the first surface drawing step shown in FIG. 8, the non-tip portion of the paper P is attracted to the peripheral surface of the drawing drum 42 shown in FIG.
  • the non-tip portion of the paper P is an area excluding the front end portion of the paper P.
  • the non-tip portion of the paper P includes at least one of the central portion and the rear end portion of the paper P.
  • the central portion of the paper P is an area including the center of the paper P.
  • the central portion of the paper P may be an area excluding the leading edge of the paper P and the trailing edge of the paper P.
  • the first surface ink drying process is executed.
  • the paper P having the blue stripe pattern image formed on the first surface is subjected to a heat drying process using the heat drying processing unit 90.
  • the second surface which is the surface opposite to the first surface of the paper P, is adsorbed and supported using the transport belt 310.
  • the conveyance belt 310 is heated to heat the paper P.
  • the conveyance belt 310 is heated to heat the paper P.
  • FIG. 8 illustrates a mode in which the entire surface of the paper P is supported on the first surface of the transport belt 310 as a mode for supporting the paper P. As shown in FIG. 7, the leading end portion of the paper P may be gripped and the non-leading end portion of the paper P may be supported on the first surface of the transport belt 310.
  • the paper reversing process is performed after the first surface ink drying process.
  • the paper P is turned over.
  • the broken line shown on the paper P represents a blue stripe pattern image formed on the first surface.
  • the second surface drawing process is executed after the paper reversing process.
  • an image is formed on the second surface of the paper P using the head unit 44.
  • FIG. 8 as an image formed on the second surface of the paper P, a blue stripe pattern image similar to the first surface is shown.
  • the second surface ink drying process is executed.
  • the first surface of the paper P is adsorbed and supported using the conveyance belt 310.
  • the second side ink drying step the second side of the paper P is dried.
  • the paper P that has been subjected to the drying process is conveyed to the stacking unit 60 shown in FIG. 7 in the paper stacking process.
  • the first treatment liquid application step for applying the treatment liquid to the first surface of the paper P using the treatment liquid application unit 20 shown in FIG. 1 and the second surface of the paper P are processed. You may perform the 2nd process liquid provision process which provides a liquid.
  • the first treatment liquid drying step for drying the treatment liquid applied to the first surface of the paper P may be performed using the treatment liquid drying unit 30.
  • a second treatment liquid drying step for drying the treatment liquid applied to the second surface of the paper P may be performed using the treatment liquid drying unit 30.
  • the second surface drawing step corresponds to an example of an image forming step of forming an image using ink on the first surface of the medium and the second surface opposite to the first surface.
  • the second surface ink drying process corresponds to an example of a drying process.
  • the process of transporting the paper P using the transport belt 310 corresponds to an example of a drying transport process.
  • the process of sucking and supporting the paper P using the transport belt 310 corresponds to an example of the suction process.
  • FIG. 9 is an explanatory diagram of a fogging failure.
  • FIG. 9 is a photograph of the first surface of the conveyance belt 310 and the first surface of the paper P after the second-surface ink drying step shown in FIG.
  • FIG. 9 shows a photograph in which the first surface of the conveyance belt 310 and the first surface of the paper P are arranged vertically.
  • the image formed on the first surface of the paper P shown in FIG. 9 is a solid black image.
  • Reference numeral 311 in FIG. 9 is a suction hole formed in the first surface of the conveyor belt 310.
  • the black solid image is a solid image formed using black ink containing colorant particles representing black.
  • the clouding failure is a heat-bonding mark generated due to heating or a pressure-bonding mark generated due to application of adsorption pressure.
  • the fogging failure is a heat fusion mark in which a part of the image component is peeled off due to heating, or an adsorption mark in which a part of the image component is peeled off due to application of the adsorption pressure.
  • the clouding failure corresponds to an example of an image failure in which the medium is not exposed.
  • the fogging failure can be quantified using the glossiness as an index.
  • FIG. 10 is an explanatory diagram of white spot failure.
  • FIG. 10 is a photograph of the first surface of the conveyance belt 310 and the first surface of the paper P after the second-surface ink drying step shown in FIG.
  • the white spot failure that occurred on the first surface of the paper P is a state in which the ink has been peeled off due to heating and pressurization.
  • the ink constituting the solid black image has been peeled off in the form of dots
  • the position where the ink has been removed is the state where the first surface of the paper P is exposed in the form of dots. is there.
  • the white spot failure corresponds to an example of an image failure in which the medium is exposed in the area where the ink is peeled off.
  • the generation factors of the clouding failure shown in FIG. 9 and the white spot failure shown in FIG. 10 are as follows. If the first surface of the conveyor belt 310 shown in FIG. 8 is not contaminated by using at least one of the ink component and the component of the paper P, the first surface of the conveyor belt 310 and the paper P It is at least one of thermal fusion and pressure bonding with the ink that forms the formed paper P image.
  • the ink component latex, wax and the like can be mentioned.
  • a component of the paper P when the paper P is a coated paper, kaolinite or the like is used.
  • drying temperature of the ink drying unit 50 When the drying temperature of the ink drying unit 50 is relatively high, a clouding failure occurs. If the drying processing temperature is set higher than the drying processing temperature of the ink drying unit 50 where the fogging failure may occur, white spot failure may occur. A cloudy fault may occur around an area where a white spot fault has occurred.
  • the conditions of the transport belt 310 are the static contact angle of the ink on the first surface of the transport belt 310 and the arithmetic average surface roughness Ra of the first surface of the transport belt 310.
  • surface roughness refers to the arithmetic average surface roughness Ra.
  • ink contact angle and the term “contact angle” indicate the static contact angle of ink.
  • FIG. 11 is a schematic diagram of the experiment.
  • a test piece 332 simulating the conveyor belt 310 is used instead of the conveyor belt 310.
  • the test piece 332 has a fluororesin film formed on one surface of a flat substrate.
  • the first surface of the test piece 332 is not formed with the suction holes 311 shown in FIGS. 9 and 10.
  • the test piece 332 shown in FIG. 11 and the conveyor belt 310 shown in FIGS. 9 and 10 are exactly the same in the base material, the fluororesin film material, and the fluororesin film formation method.
  • the experimental result using the test piece 332 shown in FIG. 11 can be regarded as the experimental result using the conveying belt 310 shown in FIGS.
  • the presence or absence of the suction hole is determined by the contact angle. It is considered that it does not depend on the measurement result and the measurement result of the surface roughness.
  • test pieces 332 There are 14 types of test pieces 332 used in the experiment.
  • the measurement values of the contact angle and the surface roughness of each test piece 332 are as shown in Table 1 below.
  • Reference numeral 1 denotes a steel plate on which no fluororesin film is formed.
  • Ra in Table 1 above represents the surface roughness.
  • the unit of surface roughness is micrometers.
  • the unit of contact angle is degrees.
  • Reference numeral 14 denotes a steel plate on which a fluororesin film is formed.
  • the test piece 332 is placed on the hot plate 330 with the surface on which the fluororesin film 334 is formed facing up.
  • a ceramic hot stirrer CHPS-170DN manufactured by AS ONE was used as the hot plate 330.
  • the test piece 332 is heated by operating a hot plate. There are six test temperatures of 80 ° C, 100 ° C, 110 ° C, 120 ° C, 140 ° C, and 160 ° C. If the temperature of the first surface of the conveyor belt 310 shown in FIG. 7 exceeds 160 ° C., there is a concern that the paper P may be deformed or yellowed due to heating.
  • the temperature condition of the ink drying process is set to 160 ° C. or less.
  • the test temperature was set to 160 ° C. or less corresponding to the temperature condition of the ink drying process. Note that the yellowing of the paper P indicates a state in which the paper P has turned yellow.
  • the test temperature was the surface temperature of the fluororesin film 334 of the test piece 332 using a digital thermometer TX1003 manufactured by Yokogawa Instruments.
  • the temperature of the first surface of the conveyance belt 310 in the adsorption belt conveyance device 302 shown in FIG. 7 can be measured by installing a thermocouple on the first surface of the conveyance belt 310.
  • test paper 336 having a solid image formed on one side was used instead of the paper P on which the image was formed on the first side and the second side.
  • the size of the test paper 336 is 5 centimeters in length and 5 centimeters in width.
  • the surface of the test paper 336 on which the solid image is formed is brought into contact with the fluororesin film 334 of the test piece 332.
  • the test paper 336 has a weight 338 placed on the surface opposite to the surface on which the black solid image is formed.
  • the weight 338 imitates the adsorption pressure applied to the paper P.
  • the weight 338 had a mass corresponding to 11.3 kilopascals. After maintaining the state where the weight 338 was placed on the test paper 336 for 10 seconds, the solid image formed on the test paper 336 was observed to determine the presence or absence of an image failure.
  • the generated phenomenon is the same between the state in which the weight 338 is placed on the test paper 336 and the state in which the adsorption pressure is applied to the paper P.
  • the reason is that one of the dominant factors of the phenomenon that occurs is pressurization and adhesion between the first surface of the conveyor belt 310 and the image formed on the first surface of the paper P.
  • the surface roughness of the fluororesin film 334 of the test piece 332 shown in FIG. 11 was measured using a small surface roughness measuring machine Surf Test SJ-210 manufactured by Mitutoyo Corporation. The measurement mode was set to JIS 1994 and auto setting. The surface roughness of the conveyor belt 310 shown in FIG. 7 can be measured using the same measuring instrument as the measurement of the surface roughness of the test piece 332 shown in FIG.
  • the contact angle of the fluororesin film 334 of the test piece 332 shown in FIG. 11 was measured using a contact angle solid-liquid interface analyzer DropMaster500 manufactured by Kyowa Interface Chemical Co., Ltd.
  • the ink used in the experiment is a water-based ink. Specifically, the ink is described in paragraph [0172], paragraph [0184], and paragraphs [0208] to [0211] of JP-A No. 2014-141035.
  • the determination of the presence or absence of a fogging failure was made using a measured value obtained by measuring the glossiness of a solid black image on the test paper 336 using a gloss meter.
  • the gloss meter used for the measurement is Micro-TRI-Gloss manufactured by BYK Gardner GmbH.
  • the measurement angle is 60 degrees.
  • Evaluation A is a level close to that of an offset printing press. Evaluation A is a level applicable to many printed products.
  • cockling in the present specification is a concept including a state in which unevenness is generated on the paper P, which is called wrinkles and undulations.
  • Evaluation B is an intermediate level between the level where no adsorption drying is performed and the level of the offset printing press. Evaluation B is a level that can be applied to some printed products.
  • the adsorption drying is a drying process performed on the adsorption-supported paper P.
  • Evaluation C is a level equivalent to the level not adsorbed and dried.
  • the evaluation C is a level that can be applied to limited print products.
  • FIG. 12 is a photograph of the state of the paper when the temperature of the first surface of the conveyor belt is 42 ° C.
  • FIG. 13 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 58 ° C.
  • FIG. 14 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 72 ° C.
  • FIG. 15 is a photograph taken of the state of the paper when the temperature of the first surface of the conveyor belt is 92 ° C.
  • the conveyance belt here is the conveyance belt 310 shown in FIG.
  • the paper P shown in FIG. 15 corresponds to the evaluation A in Table 1 above. Although illustration is omitted, the state of the paper P when the temperature of the first surface of the conveyor belt 310 shown in FIG. 7 is 80 ° C. corresponds to the evaluation B in Table 1 above. From the viewpoint of cockling, the temperature of the first surface of the conveyor belt 310 shown in FIG.
  • FIGS. 16 to 21 are graphs showing the surface roughness and contact angle of each test piece.
  • the horizontal axis in FIGS. 16 to 21 is the surface roughness.
  • the vertical axis in FIGS. 16 to 21 is the contact angle.
  • the numerical values 1 to 14 shown in FIGS. 16 to 21 correspond to the numbers of the test pieces.
  • FIG. 16 is a graph when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 80 ° C.
  • the graph shown in FIG. 17 is the case where the temperature of the fluororesin film 334 of the test piece 332 shown in FIG.
  • the graph shown in FIG. 18 is the case where the temperature of the fluororesin film 334 of the test piece 332 shown in FIG.
  • the graph shown in FIG. 19 is the case where the temperature of the fluororesin film 334 of the test piece 332 shown in FIG.
  • the graph shown in FIG. 20 is the case where the temperature of the fluororesin film 334 of the test piece 332 shown in FIG.
  • the graph shown in FIG. 21 is a case where the temperature of the fluororesin film 334 of the test piece 332 shown in FIG.
  • a broken line indicating a meter represents a lower limit value of the surface roughness in which neither a clouding failure nor a white point failure has occurred.
  • the lower limit of the surface roughness when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 100 ° C. is 1.06 micrometers.
  • the lower limit of the surface roughness when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 110 ° C. is 2.0 micrometers.
  • the lower limit value of the contact angle is 83 .5 degrees.
  • the lower limit value of the contact angle is 83.9 degrees.
  • the value of the surface roughness is a value obtained by rounding off the value of the third decimal place of the measured value shown in Table 1 above.
  • the value of the contact angle is a value obtained by rounding off the value of the second decimal place of the measured value shown in Table 1 above. The same applies to the following description.
  • a fluororesin film having a surface roughness of the first surface of 2.0 micrometers or more and a contact angle of 83.9 degrees or more is formed. Due to the use of the transported belt, occurrence of fogging failure and white spot failure is suppressed.
  • a fluororesin film having a surface roughness of the first surface of 1.06 micrometers or more and a contact angle of 83.5 degrees or more is formed. Due to the use of the transported belt, occurrence of fogging failure and white spot failure is suppressed.
  • the conveyance belt on which the fluororesin film having the surface roughness of the first surface of 0.83 micrometers or more and the contact angle of 83.5 degrees or more is formed. As a result, the occurrence of clouding failure and white point failure is suppressed.
  • the broken line representing the contact angle of 83.5 degrees shown in FIGS. 18 to 20 and the broken line representing the contact angle of 83.9 degrees shown in FIG. 21 represent the lower limit value of the contact angle at which white spot failure does not occur. To express.
  • the broken line representing the contact angle of 83.5 degrees shown in FIG. Based on 4 specimen data.
  • the data of the test piece No. 4 is not shown, No. 4 shown in Table 1 is shown.
  • the temperature of the fluororesin film 334 is 110 ° C. using the evaluation result when the temperature of the fluororesin film 334 in the test piece 4 is 100 ° C. and the evaluation result when the temperature of the fluororesin film 334 is 120 ° C. No. It is possible to estimate the evaluation result of 4 test pieces.
  • the evaluation result when the temperature of the fluororesin film 334 is 110 ° C. may correspond to either evaluation A or evaluation B. Both evaluation A and evaluation B can obtain the effect of suppressing the occurrence of white spot failure. If a clouding failure occurs when the temperature of the fluororesin film 334 is 110 ° C., an evaluation A results in inconsistency with the evaluation results, but an evaluation B results in inconsistencies with the evaluation results. .
  • the broken line in which the surface roughness shown in FIGS. 18 to 20 represents 0.83 micrometers and the broken line in which the surface roughness shown in FIG. 21 represents 2.0 micrometers does not cause white spot failure. Represents the lower limit of surface roughness.
  • the lower limit of the surface roughness when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 110 ° C. is 0.83 micrometers.
  • the lower limit of the contact angle is 83.5 degrees.
  • the lower limit of the surface roughness is 0.83 micrometers.
  • the lower limit of the contact angle is 83.5 degrees.
  • the lower limit of the surface roughness is 0.83 micrometers.
  • the lower limit of the contact angle is 83.5 degrees.
  • the lower limit value of the surface roughness is 2.0 micrometers.
  • the lower limit value of the contact angle is 83.9 degrees.
  • a fluororesin film having a surface roughness of the first surface of 2.0 micrometers or more and a contact angle of 83.9 degrees or more is formed. Due to the use of the transported belt, the occurrence of white spot failure is suppressed.
  • a fluororesin film having a surface roughness of the first surface of 0.83 micrometers or more and a contact angle of 83.5 degrees or more is formed. Due to the use of the transported belt, the occurrence of white spot failure is suppressed.
  • the upper limit of the surface roughness is preferably 6.0 micrometers or less. Due to the surface roughness of the conveyor belt exceeding 6.0 micrometers, unevenness of the conveyor belt is generated on the paper. Uneven marks on the paper P are not preferable from the viewpoint of image quality.
  • the upper limit value of the contact angle can be 90.5 degrees or less. Accordingly, when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 80 ° C., 100 ° C., 110 ° C., and 120 ° C., the occurrence of clouding failure and white spot failure occurs. Is suppressed. Further, when the temperature of the fluororesin film 334 of the test piece 332 shown in FIG. 11 is 140 ° C. and 160 ° C., the occurrence of white spot failure is suppressed. From the viewpoint of water repellency of the fluororesin film of the transport belt, the upper limit value of the contact angle is preferably 90.0 degrees or less.
  • the suction pressure for the paper P applicable to the ink jet printing apparatus can determine the lower limit value of the suction pressure from the viewpoint of suction support of the paper P and the suppression of cockling.
  • the lower limit value of the adsorption pressure of the paper P can be set to 3.0 kilopascals.
  • the suction pressure on the paper P When the suction pressure on the paper P is 3.0 kilopascals or more, the paper P can be sucked and supported and conveyed, and the occurrence of cockling can be suppressed. On the other hand, when the suction pressure on the paper is less than 3.0 kilopascals, the suction pressure on the paper P may be insufficient, and cockling may occur.
  • the upper limit value of the suction pressure of the paper P can be determined from the viewpoint of whether or not suction marks are generated, whether or not the suction effect is saturated, or the cost of the apparatus.
  • the suction effect is whether or not the paper P can be sucked and supported and transported, and whether or not cockling occurs. Whether or not the adsorption effect is saturated can be read as whether or not the suction effect is sufficiently obtained.
  • the upper limit value of the suction pressure of the paper P can be set to 11.3 kilopascals. That is, the adsorption pressure of the paper P can be set to 3.0 kilopascals or more and 11.3 kilopascals or less.
  • Black is considered to have higher visibility of fogging failure and whitening failure than other color inks. In other words, black is the strictest color condition. Then, the result of the experiment using black ink can be applied to inks of other colors.
  • colors include cyan, magenta, and yellow.
  • examples of other inks include light inks such as light cyan and light magenta, and special colors such as orange, green, and violet.
  • the cause of the image failure is considered to be at least one of the polymer component of the ink constituting the image and the adhesive component. Therefore, the above-described conditions for water-based ink can be applied to an ink containing at least one of a high-molecular component that generates adhesiveness or elasticity due to heating and an adhesive component.
  • inks in which the polymer component and the adhesive component are used include cellulose acetate butyrate, cellulose acetate propionate, chlorinated polyolefin resin, acid-modified chlorinated polyolefin resin, and graft-modified chlorinated polyolefin resin.
  • examples include oil-based inks.
  • Examples of inks using other polymer components and adhesive components include oil-based inks using acrylic resins, ultraviolet curable inks using 1,2-alkanediol, and ultraviolet curable resin emulsions, and examples of the ultraviolet curable resin include an ultraviolet curable ink using a compound having a radical polymerizable carbon-carbon double bond as the ultraviolet curable resin.
  • the above compound is a concept including at least one of a low molecular compound and a high molecular compound.
  • FIG. 22 is a plan view showing an example of the surface shape of the conveyor belt.
  • FIG. 23 is a plan view showing another example of the surface shape of the conveyor belt. 22 shows the test piece No. A part of the conveyor belt 310 corresponding to 12 is shown enlarged to 8 times. 23 shows the test piece No. A part of the conveyor belt 310 corresponding to 14 is shown enlarged to 8 times. Note that the holes of the conveyor belt 310 shown in FIG. 23 may be closed, and the structure is not necessary for the conveyor belt 310.
  • FIGS. 22 and 23 a large number of fine convex portions 310A are formed on the surface of the conveyor belt 310.
  • it is arbitrary convex part 310A, and the code
  • FIG. 24 is a schematic view of a cross section taken along the line XXIV-XXIV of the test piece shown in FIG.
  • the distance between the apexes of adjacent convex portions 310A is not less than 5 micrometers and not more than 200 micrometers.
  • the surface of the conveyor belt 310 has a shape in which convex portions 310A having a distance between vertices of 5 micrometers or more and 200 micrometers or less are repeated.
  • the height of the apex of the convex portion 310A is not limited.
  • the shape of the convex portion 310A is not limited.
  • the conveyor belt 310 has various shapes and a plurality of convex portions 310A having various heights.
  • the specific example was shown about the conveyance belt 310 equivalent to 14, it has the shape which repeated the convex part 310A whose distance between vertices is 5 micrometers or more and 200 micrometers or less also about the other test piece of Table 1. It has been confirmed that
  • the first surface of the paper on which the image is formed on the first surface is sucked and supported, and is conveyed at 80 ° C. or higher and 140 ° C. or lower.
  • the surface roughness of the fluororesin film is 0.83 micrometers or more and 6.0 micrometers or less, and the contact angle of the fluororesin film is 83.5 degrees or more and 90.5. Less than
  • the temperature condition of the paper drying process is 80 ° C. or more and 160 ° C. or less
  • the surface roughness of the fluororesin film is 2.0 ⁇ m or more and 6.0 ⁇ m or less
  • the contact angle of the fluororesin film is A similar effect can be obtained when the angle is 83.9 degrees or more and 90.5 degrees or less.
  • the temperature condition of the ink drying processing unit is 80 ° C. or more and 100 ° C. or less
  • the surface roughness of the fluororesin film is 1.06 ⁇ m or more and 6.0 ⁇ m or less
  • the contact angle of the fluororesin film is 83.
  • the angle is 5 degrees or more and 90.5 degrees or less, occurrence of a clouding failure can be suppressed.
  • cockling is suppressed due to the temperature condition being 80 ° C. or higher, it is possible to suppress both cloudy image failure and cockling.
  • the surface roughness of the conveying belt is set to 2.0 ⁇ m or more and 6.0 ⁇ m or less, and the ink contact angle is 83.9 ° or more and 90 ° or less. Similar effects can be obtained when the angle is less than 5 degrees.
  • the surface roughness of the fluororesin film is 0.83 ⁇ m or more and 6.0 ⁇ m or less, and the contact angle of the fluororesin film is 83.5 degrees. Similar effects can be obtained when the angle is 90.5 degrees or less.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ink Jet (AREA)

Abstract

L'invention concerne un dispositif de formation d'image et un procédé de formation d'image grâce auxquels la suppression du gondolage et la suppression de la décomposition d'image peuvent toutes deux être réalisées en impression double face. La présente invention comprend une unité de formation d'image pour former une image sur les deux surfaces d'un support, une unité de séchage par laquelle un traitement de séchage est effectué sur le support sur lequel l'image est formée et moyennant quoi une condition de température de 80 °C à 140 °C est appliquée, une unité de transport de séchage pourvue d'une courroie de transport pour transporter le support dans une région de traitement de séchage, et une unité de serrage par aspiration pour générer une pression de serrage par aspiration de 3,0 kilopascals à 11,3 kilopascals et serrer par aspiration le support, une région d'agencement sans trou dans laquelle des trous de serrage par aspiration ne sont pas agencés ayant une rugosité de surface moyenne arithmétique de 0,83 micromètres à 6,0 micromètres, et un film de résine fluorée ayant un angle de contact statique de 83,5 degrés à 90,5 degrés étant formé.
PCT/JP2018/002728 2017-02-01 2018-01-29 Dispositif de formation d'image et procédé de formation d'image WO2018143125A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7630408B2 (ja) 2021-10-25 2025-02-17 富士フイルム株式会社 画像記録方法及び画像記録装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001130775A (ja) * 1999-11-08 2001-05-15 Sharp Corp 記録媒体搬送装置
JP2010208803A (ja) * 2009-03-10 2010-09-24 Nitto Denko Corp 搬送用ベルト
JP2014181130A (ja) * 2013-03-21 2014-09-29 Fujifilm Corp 画像形成装置
JP2017013507A (ja) * 2016-08-17 2017-01-19 セイコーエプソン株式会社 印刷装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001130775A (ja) * 1999-11-08 2001-05-15 Sharp Corp 記録媒体搬送装置
JP2010208803A (ja) * 2009-03-10 2010-09-24 Nitto Denko Corp 搬送用ベルト
JP2014181130A (ja) * 2013-03-21 2014-09-29 Fujifilm Corp 画像形成装置
JP2017013507A (ja) * 2016-08-17 2017-01-19 セイコーエプソン株式会社 印刷装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7630408B2 (ja) 2021-10-25 2025-02-17 富士フイルム株式会社 画像記録方法及び画像記録装置

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