WO2018120371A1

WO2018120371A1 - Bi-directional scraper apparatus for textile printing machine

Info

Publication number: WO2018120371A1
Application number: PCT/CN2017/073734
Authority: WO
Inventors: 钟博文
Original assignee: 长胜纺织科技发展(上海)有限公司; 钟博文
Priority date: 2016-12-27
Filing date: 2017-02-16
Publication date: 2018-07-05
Also published as: TW201823042A; TWI655099B; CN108237763B; CN108237763A

Abstract

A bi-directional scraper apparatus (1) for a textile printing machine, the bi-directional scraper apparatus (1) comprising: a scraper assembly (10), the scraper assembly (10) comprising a scraper holder (11), two scrapers (12), and corresponding scrapper pressing plates (13), the scraper holder (11) having a groove (14), the two scrapers (12) being obliquely mounted, with their blades opposing each other, on either side of an opening of the groove (14) and extending along a vertical direction, the scraper pressing plates (13) being used for tightly pressing the scrapers (12) onto the scraper holder (13); end seal parts (15) used for sealing the two vertical ends of the scraper assembly (10); a displacement mechanism (20) used for making the scraper assembly (10) to pivotally move between a working position and a non-working position, the displacement mechanism (20) having a pivot part; and an adjustment mechanism (30) used for adjusting a contact pressure between the scrapers (12) and a roller when the scraper assembly (10) is at the working position. Also provided is a textile printing machine comprising the bi-directional scraper apparatus (1).

Description

Two-way scraper device for textile printing machine

Technical field

The present invention relates to a bidirectional doctor apparatus for a textile printing machine. The invention also relates to a textile printing machine comprising the two-way doctor apparatus.

Background technique

There are many printing and dyeing processes and machinery, and there are a wide variety of products. At present, the main printing processes include screen printing, roller printing, plate printing, transfer printing and digital inkjet printing. The corresponding equipment is mainly rotary screen printing machine, flat screen printing machine, roller printing machine and platen. Printing machine, transfer printing machine, digital inkjet printing machine, etc.

Printing machines typically include an inking or sizing device for inking or sizing a printing plate roll or a coating roll (or anilox roll). Conventional inking or sizing devices typically include rollers, doctor blades, and liquid baths. The lower semicircle of the roller is immersed in the liquid bath, and the ink or slurry in the liquid bath is applied to the surface of the roller as the roller rotates. The doctor blade is usually a single blade for scraping off excess ink or slurry on the roller. Such an inking or sizing device may be referred to as an open inking or sizing device, and the blade used may be referred to as an open single blade.

Conventional inking or sizing devices using open single scrapers have problems such as uneven wiper flow, easy accumulation of liquid between the scraper and the roller, and residual liquid flow.

In addition, since the liquid tank is open, it also has the following defects: 1) The liquid in the liquid tank has a large amount of volatilization, and the air exhausted by the exhaust fan accelerates the flow of air around the printing unit, so that the liquid is easily deposited and cannot be smoothly transferred. To the printing material; 2) The liquid is volatilized in a large amount. If it is not replenished in time, it will change the viscosity of the liquid; 3) The liquid is susceptible to the influence of the ambient temperature, so that the printing quality is not stable enough.

Moreover, the prior art doctor apparatus does not finely adjust the contact pressure between the blade and the roller. Therefore, on the one hand, the quality of the feed liquid may be low due to the contact pressure being too small, and on the other hand, the wear of the roll surface may be caused by excessive contact pressure.

Summary of the invention

In view of this, the present invention provides a novel bidirectional doctor apparatus for a textile printing machine which can be used to solve the above technical problems.

The bidirectional doctor apparatus for a textile printing machine includes: a doctor blade assembly including a tool holder, Two doctor blades and a corresponding doctor blade press plate extending longitudinally, and the tool holder has a groove on a side facing the roller, the groove forming a space for accommodating liquid to be supplied to the roller, The two scrapers are obliquely mounted on opposite sides of the opening of the groove in the longitudinal direction of the groove and extend in the longitudinal direction, the blade presser for pressing the blade against the tool holder An end seal member disposed at both longitudinal ends of the tool holder for sealing the two longitudinal ends of the blade assembly; a shifting mechanism having the shifting mechanism a pivoting member for pivotally moving the scraper assembly between an operative position and a non-operating position, wherein in the operative position, the scraper is pressed against the roller and two of the scraper assemblies The doctor blade and the roller surface between the two doctor blades and the end seal member form a closed liquid receiving chamber in which the doctor blade assembly is separated from the roller; and an adjustment mechanism, the adjustment Mechanism for the scraper assembly Adjusting the contact pressure between the blade and the roller to said operative position.

Preferably, the pivoting member of the shifting mechanism is disposed at a lateral first end of the bi-directional doctor apparatus, and the adjustment mechanism is disposed at a lateral second end opposite the lateral first end.

Preferably, the adjustment mechanism includes a nut screw mechanism and an adjustment portion fixed to the blade assembly, and the adjustment of the contact pressure is performed by interaction of the nut screw mechanism with the adjustment portion.

Preferably, the nut screw mechanism includes a nut member and an adjusting screw, and the nut member is fixed to a mounting bracket of the bidirectional scraper device, and one end of the adjusting screw presses the adjusting portion, wherein The nut member screws the adjustment screw to interact with the adjustment portion to move the blade assembly relative to the roller, thereby effecting adjustment of the contact pressure between the blade and the roller.

Preferably, the adjustment screw presses the adjustment portion in a direction to move the blade assembly away from the roller.

Preferably, the two-way doctor apparatus further includes a locking mechanism for locking the working position of the doctor blade assembly.

Preferably, the locking mechanism includes a lock nut that is threadedly coupled to the adjustment screw to effect locking of the working position of the blade assembly in the locked position.

Preferably, the two scrapers are respectively an inverted scraper and a forward scraper, wherein the reverse scraper is used to scrape off excess liquid supplied to the roller, and the forward scraper is used for removing The impurities on the rolls are sealed.

Preferably, a pivoting member of the shifting mechanism is disposed at a lateral first end of the bidirectional doctor device, and the adjustment mechanism is disposed at a lateral second end opposite the lateral first end, And wherein the reverse scraper is disposed adjacent to a lateral first end of the bidirectional doctor apparatus, the forward scraper being adjacent to the two-way The lateral second end of the doctor apparatus is disposed.

Preferably, the reverse blade has a blade contact angle of between 120° and 160°.

Preferably, the positive blade has a blade contact angle of between 20° and 60°.

Preferably, the blade edge has an oblique angle of between 20 and 40 degrees.

Preferably, the roller is a printing plate roll, the blade edge of the blade is not parallel to the tangent plane of the printing plate roll.

Preferably, the roll is a coating roll or an anilox roll, the doctor blade edge being parallel to the tangent plane of the applicator roll or anilox roll.

Preferably, the doctor blade is made of a stainless steel material, and the thickness of the doctor blade is generally between 0.15 mm and 0.20 mm.

Preferably, the end seal member is mounted in the groove of the tool holder in an interference fit.

Preferably, the end seal member is composed of two clamping plates with a sealing material disposed between the two clamping plates.

Preferably, the sealing material is a urethane rubber.

Preferably, the two-way doctor apparatus further includes a constant temperature heating system for maintaining the temperature of the ink chamber between room temperature and 40 degrees Celsius.

The present invention also provides a textile printing machine comprising a two-way doctor apparatus according to the present invention.

Compared with the existing doctor device, the two-way doctor device of the invention has the following beneficial effects: since the liquid receiving chamber is completely closed, the evaporation of the water solvent during the use of the ink or the slurry is avoided, and the color hue of the long-time large-volume printing is stabilized. The problem of foam accompanying the use process is terminated; in addition, the ink scraping or squeegee is uniform and clean, and there is no problem of residual liquid flow; the liquid circulation in the liquid accommodating chamber is smoother, and can adapt to the production of high speed conditions.

In addition, the adjusting mechanism of the bidirectional doctor device of the present invention can finely adjust the contact pressure between the blade and the roller when the blade assembly is in the working position, thereby accurately adjusting the contact pressure to a desired pressure range; The adjustment mechanism has a small number of components and a simple structure, which not only facilitates the structural arrangement of the two-way scraper device but also saves cost.

DRAWINGS

The invention will now be further described with reference to the drawings and embodiments.

1 shows a schematic elevational view of a two-way doctor apparatus for a textile printing machine in accordance with one embodiment of the present invention.

Figure 2 shows a side cross-sectional view taken along section line A-A of Figure 1.

Figure 3 shows a side cross-sectional view taken along section line B-B of Figure 1.

detailed description

The technical solutions of the present invention are further described in detail below through the accompanying drawings and the embodiments shown. It should be noted that any technical features and any technical solutions in the embodiments do not limit the scope of protection of the present invention, and the scope of protection of the present invention should include any equivalent or alternative technology that can be conceived by those skilled in the art without any creative work. Program.

In the present specification, referring to Fig. 1, the longitudinal direction refers to a direction extending in the axial direction of the printing plate roller, and the lateral direction refers to a direction perpendicular to the longitudinal direction and located in the plane of the sheet in which Fig. 1 is located, laterally The direction refers to a direction perpendicular to the longitudinal direction and the lateral direction. In addition, the upper end and the lower end are only used to indicate the relative positions of the components in Fig. 1, and do not represent the positions during their actual use.

For convenience of description, the two-way doctor apparatus for a printing plate roll is described as an example in the following embodiments, but it should be understood that the two-way blade device according to the present invention can be applied to other rolls requiring surface liquid supply, for example, The coating roller (anibric roller) of the sizing of the fabric, or the humidifying roller for wetting the transfer carrier, etc., will not be described herein.

As shown in FIG. 1, a bidirectional doctor apparatus 1 of the present invention includes a doctor blade assembly 10, a shifting mechanism 20, an adjustment mechanism 30, and a locking mechanism 40, in accordance with an embodiment of the present invention.

The doctor blade assembly 10 includes a tool holder 11, two doctor blades 12, and two blade press plates 13.

As shown in Fig. 1, the tool holder 11 extends in the longitudinal direction. The holder 21 has a groove 14 extending in the longitudinal direction on the side facing the printing plate roller for forming an accommodation space for accommodating the ink. The opening of the groove 14 is rectangular and is formed centrally on the tool holder 11.

The two scrapers 12 extend in the longitudinal direction and are respectively disposed on both sides of the opening of the recess 14 of the holder 11. Specifically, as shown in FIG. 2, the two scrapers 12 are obliquely arranged in a blade-pointed manner such that the blade tip of the blade contacts the surface of the printing plate roller at a specific blade contact angle. Wherein, the blade contact angle refers to a circumferential tangential speed direction of the printing plate roller at the contact point between the blade and the printing plate roller and a blade extension line (which is perpendicular to the length extending direction of the blade and along the blade from the blade to the blade) The angle between the sharp directions).

Referring to Figure 3, the two scrapers 12 may be referred to as inverted (or inverse), respectively, depending on the size of the blade contact angle. The blade 121 and the forward blade 122 are oriented. The function of the reverse blade 121 is to scrape off excess ink on the printing plate roll to provide the supply of ink required for printing, while the positive blade 122 functions primarily to seal and remove residual ink and accumulated impurities.

The blade contact angle of the reverse blade 121 is greater than 90°, so that the blade can perform the cutting action on the ink on the printing plate roller, and the ink can apply pressure to the blade to abut against the surface of the printing plate roller, and scrape the ink. The effect is better and the wear of the doctor blade and the printing plate roller is alleviated. In addition, since the reverse blade is at an obtuse angle with the printing plate roll, ink between the blade and the plate roller is not accumulated, so that the ink circulation in the liquid accommodating chamber is made smoother.

In an embodiment of the invention, the blade contact angle of the forward blade 122 is between 20° and 60°. Preferably, the blade contact angle of the positive blade can be between 30° and 50°. More preferably, the blade contact angle of the forward blade may be 45.

In an embodiment of the invention, the blade contact angle of the reverse blade 121 is between 120° and 160°. Preferably, the blade contact angle of the reverse blade may be between 130° and 150°. More preferably, the blade contact angle of the reverse blade may be 135°.

At the end of the blade in contact with the printing plate roll (i.e., the end of the doctor blade), the blade has a longitudinally extending end face, i.e., a blade edge, said blade edge having an oblique angle of between 20 and 40 degrees. When the doctor blade is applied to the printing plate roller, the blade edge of the doctor blade is not parallel to the tangent plane of the printing plate roller, so that the effect of the point scraping or the wire scraping is formed to prevent the blade from being dirty and causing the knife wire and the like. When the doctor blade is applied to a coating roller or an anilox roller (ie, when applied to a coating or sizing function), the edge of the doctor blade is parallel to the tangent plane of the coating roller or the anilox roller, thereby forming a surface scraping effect, Make coating or sizing uniform. In this case, the width of the contact surface formed by the blade edge and the coating roller or the anilox roller is generally 1-2 mm.

Additionally, the scraper may be made of a stainless steel material. The thickness of the doctor blade is generally between 15 filaments and 20 filaments (between 0.15 mm and 0.20 mm).

Two blade pressers 13 are used to press the respective doctor blades 12 against the tool holder 11, respectively. In the embodiment of the invention, the blade presser 13 presses the blade 12 against the tool holder 11 by screws.

End seal members 15 are respectively mounted at the two longitudinal ends of the tool holder 11. The end seal member 15 is mounted in an interference fit in the recess 14 of the tool holder 11 for sealing the two longitudinal ends of the doctor assembly. The end seal member 15 comprises two clamping plates 3, between which a sealing material 4 is fixed. The sealing material can be fixed in the middle of the two clamping plates by bolting.

Traditionally, sealing materials have used foam sealing materials such as foamed plastics and the like. Foam sealing materials are fixed doors The presence of a defect with a short life span. In the embodiment of the invention, the sealing material 4 is a urethane rubber, so that the sealing material 4 can be repeatedly used for a long period of time and the width of the sealing material 4 can be adjusted.

According to the above configuration, when the doctor blade assembly is pressed against the printing plate roller, the surface of the printing plate roller between the two doctor blades 12, the two doctor blades 12, the groove 14 of the tool holder 11, and the tool holder 11 The two end seal members 15 at both ends together form a closed ink chamber.

According to an embodiment of the invention, the bidirectional doctor apparatus 1 of the invention further comprises two shifting mechanisms 20 respectively arranged at the two longitudinal ends of the doctor blade assembly 10 for enabling the doctor blade assembly 10 to work by pivoting movement Move between position and non-working position. Wherein in the working position, the doctor blade is pressed against the printing plate roll, and the doctor blade assembly forms a closed ink chamber together with the surface of the printing plate roller between the two doctor blades 12; In the working position, the doctor blade assembly is separated from the printing plate roll.

Each of the shifting mechanisms 20 includes a pivoting member for pivoting the scraper assembly 10 between a operative position and an inoperative position. In an embodiment of the invention, the pivoting member is a shaft and bearing assembly, each bearing assembly comprising a bearing 21, a bearing sleeve 22. In addition, the bearing assembly may further include a shaft end cover 23 and a squeak cover 24.

The bearing assembly is mounted at one end of the first pile head (shaft) 8. The other end of the first pile head 8 is fixed to the first end (the lower end in Fig. 1) of the support plate 6 in the lateral direction. The support plate 6 is fixed to a movable frame (not shown) by a bolt connection.

The pivoting member is coupled to the scraper assembly via a connector. In an embodiment of the invention, an adjustment plate 7 is fixed to the bearing sleeve 22. A first end (lower end in FIG. 1) of the regulating plate 7 in the lateral direction is fixed to the bearing sleeve 22 by a bolt connection. The longitudinal end of the doctor blade assembly 10 is fixed to the adjustment plate 7 via the end plate 2. In this way, the connection of the pivoting member to the doctor blade assembly is achieved.

Both ends of the second pile head (shaft) 9 are respectively connected to the second end of the regulating plate 7 in the lateral direction (the upper end in FIG. 1) and the second end of the support plate 6 in the lateral direction (in FIG. 1 Upper end). The second ends of the adjustment plate 7 and the support plate 6 are respectively opposed to their first ends in the lateral direction.

According to the above configuration, the scraper assembly 10 can be pivoted around the pivoting member (bearing assembly) via the regulating plate 7, thereby achieving movement between the working position and the inoperative position. When the doctor blade assembly is moved into its operative position, the doctor blade assembly can be secured in its operative position by a variety of conventional fastening devices. In an embodiment of the invention, the doctor blade assembly is secured in the operative position by a threaded bore for the fixed screw and doctor device and mating on the frame. When it is necessary to move the scraper assembly from the working position to the non-working position, unscrew the solid for the solid The fixed screw can be pivotally moved by the shifting mechanism.

According to an embodiment of the present invention, the bidirectional doctor apparatus 1 of the present invention further has two adjustment mechanisms 30 for adjusting the contact pressure between the doctor blade of the doctor blade assembly 10 and the printing plate roller. The two adjustment mechanisms 30 are located at the two longitudinal ends of the doctor blade assembly 10, respectively. Further, each of the adjustment mechanisms 30 is located at the other end opposite to the end where the pivoting member is located in the lateral direction, that is, the adjustment mechanism 30 is located at the second end of the adjustment plate 7 in the lateral direction.

As shown in FIGS. 1 and 3, the adjustment mechanism 30 includes an adjustment screw 31 and a fixing plate 32. The fixing plate 32 is located between the support plate 6 and the adjustment plate 7 in the longitudinal direction, and on the side away from the printing plate roller. The fixing plate 32 is fixed to the bidirectional doctor device, and is fixed to the second end (the upper end in Fig. 1) of the regulating plate 7 in the lateral direction, for example, by bolting.

The adjusting screw 31 penetrates the second pile head 9 in the lateral direction and is threadedly coupled to the second pile head 9. The front end of the adjusting screw 31 faces the fixing plate 32.

Thus, when it is necessary to adjust the contact pressure between the blade of the doctor blade assembly 10 and the printing plate roller, the adjusting screw 31 can be screwed clockwise or counterclockwise to move in the lateral direction toward or away from the fixing plate 32. .

For example, the contact pressure between the doctor blade and the printing plate roller is excessively large. At this time, the adjusting screw 31 is screwed to move in the lateral direction toward the fixing plate 32. The front end of the adjusting screw 31 presses against the fixing plate 32 and urges the fixing plate 32 in a direction to move the blade assembly away from the printing plate roller. Since the fixing plate 32 is fixed to the regulating plate 7, the adjusting plate 7 can be pivoted about the pivoting member in a direction away from the printing plate roller. Thus, the doctor blade assembly 10 is moved away from the printing plate roller by the pivoting of the regulating plate 7, thereby reducing the contact pressure between the blade and the printing plate roller.

The adjustment mechanism 30 of the present invention can be used to finely adjust the contact pressure between the doctor blade and the printing plate roll after the doctor blade assembly is moved into the working position by the shifting mechanism. By adjusting the pressing force of the screw 31 to the fixing plate 32 and combining the pivoting members of the shifting mechanism, the blade assembly can be rotated at a small angle around the pivoting member of the shifting mechanism, thereby accurately contacting the blade with the printing plate roller. Ground adjustment to the desired pressure range.

Further, the adjustment mechanism 30 of the present invention is adjusted using only two components of the adjustment screw 31 and the fixing plate 32 in combination with the existing pivoting members of the shifting mechanism. Therefore, the number of adjustment mechanism components of the present invention is small and the structure is very simple. In this way, the use of other separate and complicated adjustment mechanisms in the doctor apparatus is avoided, thereby facilitating both the structural arrangement of the two-way doctor apparatus and the cost.

In an embodiment of the invention, as shown in Figure 3, the two-way doctor apparatus 1 of the present invention further includes two locking mechanisms 40 for locking the adjusted working position of the doctor assembly. Each of the locking mechanisms 40 includes a lock nut 41. A handle bar 42 is mounted on the lock nut 41. The lock nut 41 is penetrated by the adjusting screw 31 and is threadedly coupled to the adjusting screw 31. The lock nut 41 is located on the opposite side of the fixed plate 32 with respect to the second pile head 9. In other words, the lock nut 41 and the fixing plate 32 are respectively located on both sides of the second pile head 9 in the lateral direction.

When the adjustment screw 31 is adjusted to the proper position, the lock nut 41 is rotated by the handlebar 42 so that the locking thread 41 abuts against the second pile head 9 to lock the adjusted working position.

Although not shown in the drawings, the bidirectional doctor apparatus 1 of the present invention may further include a constant temperature heating system for maintaining the ink chamber temperature between room temperature and 40 degrees Celsius. In this way, the ink can be kept at the required temperature, the influence of the seasonal ambient temperature on the ink is avoided, and the printing quality is stabilized. In addition, the preheated ink dries faster after exposure to outside air, thereby adapting to high speed conditions.

Although the pivoting member and the adjusting mechanism of the longitudinal end of the bidirectional doctor device are described with reference to the accompanying drawings, those skilled in the art may contemplate that a corresponding pivoting member and adjusting mechanism may be provided at the other longitudinal end of the bidirectional doctor device according to the present embodiment, I will not repeat them here.

Although the present invention has been described with reference to the specific exemplary embodiments, the invention is not limited by these exemplary embodiments. It will be appreciated that those skilled in the art can change and modify the exemplary embodiments without departing from the scope and spirit of the invention.

Claims

A bidirectional doctor apparatus (1) for a textile printing machine for supplying liquid to a roller, the bidirectional doctor apparatus comprising:

a doctor blade assembly (10) comprising a tool holder (11), two doctor blades (12) and a corresponding blade pressure plate (13) extending longitudinally, and the tool holder is facing the roller One side has a groove (14) which forms a space for accommodating the liquid to be supplied to the roller, and the two scrapers (12) are obliquely mounted in the groove in a knife-point opposite manner (14) a side of the opening in the lateral direction and extending in the longitudinal direction, the blade pressing plate (13) for pressing the blade (12) against the tool holder (13);

An end seal member (15), the end seal member being disposed at both longitudinal ends of the tool holder for sealing the two longitudinal ends of the scraper assembly (10);

a shifting mechanism (20) having a pivoting member for pivotally moving the scraper assembly (10) between a working position and a non-working position, wherein in the working position, The scraper (12) is pressed against the roller, and the two scrapers (12) of the scraper assembly (10) together with the roller surface between the two scrapers and the end seal member form a closed liquid receiving chamber. In the inoperative position, the doctor blade assembly (10) is separated from the roller; and

An adjustment mechanism (30) for adjusting the contact pressure between the blade and the roller when the blade assembly is in the working position.
A bidirectional doctor apparatus (1) according to claim 1, wherein a pivoting member of said shifting mechanism (20) is provided at a lateral first end of said bidirectional doctor apparatus, said adjustment mechanism (30) Provided at a lateral second end opposite the lateral first end.
A bidirectional doctor apparatus (1) according to claim 2, wherein said adjustment mechanism (30) includes a nut screw mechanism and an adjustment portion (32) fixed to said blade assembly (10) through a nut screw The interaction of the mechanism with the adjustment portion performs the adjustment of the contact pressure.
A bidirectional doctor apparatus (1) according to claim 3, wherein said nut screw mechanism comprises a nut member and an adjustment screw (31) fixed to a mounting bracket of said bidirectional doctor apparatus, One end of the adjusting screw (31) presses the adjusting portion (32),

Wherein, the adjusting screw (31) is screwed with respect to the nut member to interact with the adjusting portion (32), thereby moving the scraper assembly (10) relative to the roller, thereby realizing Between the scraper and the roller The adjustment of the contact pressure.
A bidirectional doctor apparatus (1) according to claim 4, wherein said adjustment screw (31) presses said adjustment portion (32) in a direction to move said blade assembly away from said roller.
The bidirectional doctor apparatus (1) of claim 1 further comprising a locking mechanism (40) for locking the working position of the doctor blade assembly (10).
A bidirectional doctor apparatus (1) according to claim 6, wherein said locking mechanism (40) includes a lock nut (41), said lock nut (41) being threadedly coupled to said adjustment screw (31), The locking of the working position of the doctor blade assembly is achieved in the locked position.
The bidirectional doctor apparatus (1) according to any one of claims 1 to 7, wherein the two scrapers (12) are an inverted scraper and a forward scraper, respectively, wherein the reverse scraper Used to scrape off excess liquid supplied to the roll, which is used to remove impurities from the roll and seal.
A bidirectional doctor apparatus (1) according to claim 8, wherein a pivoting member of said shifting mechanism (20) is provided at a lateral first end of said bidirectional doctor apparatus, said adjustment mechanism (30) Provided at a lateral second end opposite the lateral first end, and wherein the inverted scraper is disposed adjacent a lateral first end of the bi-directional scraper device, the positive scraper being proximate to The lateral second end portion of the bidirectional doctor device is disposed.
A bidirectional doctor apparatus (1) according to claim 8 or 9, wherein said reverse blade has a blade contact angle of between 120 and 160, wherein said blade contact angle is a roller at the blade The angle between the tangential velocity at the point of contact of the roller and the extension of the blade from the back of the blade to the tip.
A bidirectional doctor apparatus (1) according to claim 8 or 9, wherein said positive blade has a blade contact angle of between 20 and 60, wherein said blade contact angle is a roller at the blade The angle between the tangential velocity at the point of contact of the roller and the extension of the blade from the back of the blade to the tip.
A bidirectional doctor apparatus (1) according to claim 1 wherein the doctor blade edge of the doctor blade has an oblique angle of between 20 and 40 degrees.
A bidirectional doctor apparatus (1) according to claim 12, wherein said roller is a printing plate roll, said blade edge not being parallel to a tangent plane of said printing plate roll.
A bidirectional doctor apparatus (1) according to claim 12, wherein said roller is a coating roller or an anilox roller, said blade edge front being parallel to a tangent plane of said coating roller or anilox roller.
A bidirectional doctor apparatus (1) according to claim 1, wherein said doctor blade is made of a stainless steel material, and said blade has a thickness generally between 0.15 mm and 0.20 mm.
A bidirectional doctor apparatus (1) according to claim 1, wherein said end seal member (15) is mounted in an interference fit in a recess (14) of said tool holder (11).
A bidirectional doctor apparatus (1) according to claim 16, wherein said end seal member (15) is constituted by two clamping plates (3), and a sealing material is disposed between said two clamping plates (4).
The bidirectional doctor apparatus (1) according to claim 17, wherein the sealing material (4) is a urethane rubber.
The bidirectional doctor apparatus (1) according to any one of claims 1 to 7, further comprising a constant temperature heating system for maintaining the temperature of the ink chamber between room temperature and 40 degrees Celsius.
A textile printing machine comprising the two-way doctor apparatus according to any one of claims 1-19.