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WO2013134390A2 - Procédé et processeur de développement d'une plaque d'impression lithographique porteuse d'image en lumière violette - Google Patents

Procédé et processeur de développement d'une plaque d'impression lithographique porteuse d'image en lumière violette Download PDF

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Publication number
WO2013134390A2
WO2013134390A2 PCT/US2013/029378 US2013029378W WO2013134390A2 WO 2013134390 A2 WO2013134390 A2 WO 2013134390A2 US 2013029378 W US2013029378 W US 2013029378W WO 2013134390 A2 WO2013134390 A2 WO 2013134390A2
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WIPO (PCT)
Prior art keywords
plate
coating
radiation
imaged
areas
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PCT/US2013/029378
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English (en)
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WO2013134390A3 (fr
Inventor
Howard A. Fromson
William J. Ryan
Anthony Paul Kitson
Brian L. Anderson
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Anocoil Corporation
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Filing date
Publication date
Priority claimed from US13/413,280 external-priority patent/US8785109B2/en
Application filed by Anocoil Corporation filed Critical Anocoil Corporation
Publication of WO2013134390A2 publication Critical patent/WO2013134390A2/fr
Publication of WO2013134390A3 publication Critical patent/WO2013134390A3/fr
Priority to US14/478,312 priority Critical patent/US20150053103A1/en

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/40—Treatment after imagewise removal, e.g. baking
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/004—Photosensitive materials
    • G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/26—Processing photosensitive materials; Apparatus therefor
    • G03F7/30—Imagewise removal using liquid means
    • G03F7/3042—Imagewise removal using liquid means from printing plates transported horizontally through the processing stations
    • G03F7/305—Imagewise removal using liquid means from printing plates transported horizontally through the processing stations characterised by the brushing or rubbing means

Definitions

  • the present invention relates to lithographic printing plates.
  • Plates of interest have a solvent-soluble, radiation- polymerizable, oleophilic resin coating on a hydrophilic substrate.
  • UV ultraviolet
  • UV visible
  • IR infrared
  • the plates are developed with solvent to remove the unexposed areas of the coating by dissolution, thereby producing a substantially planographic pattern of oleophilic and hydrophilic areas.
  • the developed plates are then ready for mounting on a cylinder of a printing press, where the plates are subjected to fountain fluid and ink for transfer of ink to a target surface according to the pattern of oleophilic and hydrophilic areas on the plate.
  • the imaging radiation produces a cross-linking reaction in the imaged areas, which increases the mechanical adhesion of the image areas to the grained surface of the substrate, and also increases the cohesion (hardening) of the image area so that it can withstand the abrasive effect of receiving and transferring ink during the production run on-press.
  • Thermally imageable plates are commercially available, which require no pre-heat step prior to development. These plates usually have relatively low resolution and short press lives. The main reason for this is that they need more imaging exposure energy in order to gain integrity for the image. When an image is created in this manner it causes the “dots” or pixels that form the image to gain surface area. This phenomenon is called “dot gain” and causes degradation in the resolution of the plate.
  • the plate can be exposed at lower imaging energy and then pre-heated before development, but "dot gain” still occurs. However, in this case it is the excess energy of the heater that is causes the "dot gain”. This energy (in the form of heat) forces the polymerization to continue not only in the center of the dots (which is needed for longer press life) but it also causes the dots to grow out from the edges.
  • the present invention addresses and minimizes the necessity of such tradeoff for plates actinically imaged, especially with violet but including UV radiation and reduces processing and equipment costs.
  • the disclosed method achieves the remarkable combination of significantly reducing the imaging time, increasing the resolution, and increasing the hardness and thus on-press life of the printable plate.
  • the method produces a plate with high resolution, long press life, using low power imaging, and low energy post treatment.
  • This method is based on the combination of (i) a coating formulation that yields an image of high resolution when image-wise exposed one of more of IR, visible, or UV energy; (ii) a coating formulation that when exposed to such imaging would have sufficient image integrity to survive the development step with negligible loss of the active ingredients; (iii) a developer that would not leach out or destroy the active ingredients of the image areas; (iv) a low power post treatment of IR and/or UV energy to the surface of the plate to further react the active ingredients in the image areas; and (v) using compact processor equipment.
  • the disclosure is directed to a method for producing a lithographic printing plate from a negative working, radiation imageable plate having an upper surface covered with an oleophilic resin coating having active ingredients that react to radiation by participating in cross linking and which is non-ionically adhered to a hydrophilic substrate, comprising in uninterrupted sequence: (a) imagewise exposing the coating with violet or UV radiation to produce an imaged plate having partially reacted image areas including unreacted coating material, and completely unreacted nonimage areas; (b) without preheating the imaged plate, developing the plate with brushes in an aqueous solution to remove the nonimage areas while retaining all the unreacted active ingredients in the image areas; and (c) subjecting the upper surface of the developed plate to blanket exposure with an external source of UV or IR energy which further reacts the retained unreacted material in the image areas.
  • the disclosure is directed to a method for producing a lithographic printing plate from a negative working, radiation imageable plate having an oleophilic resin coating that reacts to radiation by cross linking, non-ionically adhered to a hydrophilic substrate, and covered by a water soluble oxygen barrier top coat, comprising: (a) imagewise radiation exposing the plate to produce an imaged plate having partially reacted image areas including unreacted coating material, and completely unreacted nonimage areas; (b) without preheating the imaged plate, delivering the imaged plate to a developing station containing a single developing tank where an aqueous solution is delivered at rotating brushes; (c) conveying the imaged plate through the tank while contacting the plate with the aqueous solution and brushes, thereby (i) dissolving the top coat, (ii) developing the plate by substantially completely removing only the unreacted, nonimage areas from the substrate while retaining unreacted material in the image areas and (iii) conditioning the upper surface of the plate, all
  • the disclosure is directed to a system for producing lithographic printing plates from negative working, radiation imageable plates having a hydrophilic substrate with an upper surface covered with a non-ionically adhered oleophilic resin coating that reacts to radiation by cross linking, comprising: an imaging station including a violet or UV laser for imagewise exposing said imageable plates; a wash out station having (i) an upstream conveyor for receiving an imaged plate and conveying the plate in a process direction; (ii) a tank beneath the conveyor; (iii) brushes rotatable against the plate as the plate is conveyed; source of wash out solution including a conditioning agent, for deposit on the plate as the brushes rotate against the conveyed plate to remove unimaged areas from the plate; and (iv) a downstream conveyor following the brushes in the process direction, for discharging the plate from the wash out station with a film of said aqueous wash solution on the plate.
  • a post treatment station immediately follows the wash out unit, for receiving the plates from the downstream conveyor and
  • the imaging radiation is slightly above the minimum level that provides sufficient cross-linking to prevent removal of the imaged areas during development. Post-treating is then relied on to maximize the cross-linking and thereby achieve improved plate life on- press.
  • conventional infrared (IR) imaging energy is about 125 mj/cm 2 , after preheating at 102° C.
  • imaging can be achieved at up to three or more times the speed, i.e., in the range of about 80-40 mj/cm 2 .
  • the per cent of cross linking resulting from the post-heating and UV exposure can be greater than the per cent of cross linking from the imaging radiation.
  • Imaging at this much lower energy level has another advantage beyond increased production speed.
  • Imaging at a relatively high but common resolution of 2400 dpi at 200 lines per inch requires that each "dot" or "pixel” of imaged coating have the desired area as imaged and that the surrounding unimaged material be cleaned out.
  • the use of the common energy level of 125 mj/cm 2 can produce dot gain in which coating material surrounding the nominal area of dot exposed to the radiation, experiences residual or ancillary cross-linking at the edge of the dot, thereby degrading the resolution.
  • At less than 100 mj/cm 2 especially at 70 mj/cm 2 , resolution degradation due to dot gain is negligible, if not avoided all together.
  • the present inventors have recognized the especially suitable applicability of mechanical development for implementing the present invention. Unlike with chemical development, all unreacted material remains in the image areas even after development is complete, so that post-treatment produces additional, if not maximum, cross-linking. Development using only mechanical forces, is described in U.S. Pat. No. 8,137,897 "Processless Development of Printing Plate” (the disclosure of which is hereby incorporated by reference).
  • the mechanical development of imaged plates has numerous advantages over known techniques that rely on solubilization or dispersion for removal of the unimaged areas. These advantages include retention of the full integrity of the imaged areas, and avoiding the handling of chemical waste product.
  • the plate is preferably developed by removing the nonimage areas from the substrate without dissolution or dispersion of any of the nonimage and image areas, but the advantages over previously known techniques are achievable in a practical implementation even if the coating experiences minor, incidental dissolution or dispersion.
  • the plate is developed by application of mechanical force on all the coating to mechanically dislodge only the nonimage areas as particles from the substrate without dissolution or dispersion of any coating material, such that the integrity of the image areas remains intact.
  • the nominal coating weight is retained in the image areas through completion of the blanket exposure.
  • the preferred plate as imaged comprises (i) a substrate with a grained, anodized, hydrophilic surface and (ii) a negative working, organic, polymerizable coating in which all active components for polymerization are not soluble or dispersible in water.
  • active means an ingredient that participates in the radiation induced polymerization in the imaged areas. This generally means the active ingredients are a polymer, a monomer and/or oligomer, at least one polymerization or cross link initiator, and a dye.
  • Effective imaging produces no cross linking in the nonimage areas and as little as half of the ultimate cross linking in the image areas.
  • Development removes at least 95 per cent and preferably at least 98 per cent of nonimage material on the plate, while retaining at least about 98 per cent of the initial coating weight in the image areas.
  • a small degree of dissolution or dispersion of the binder or stabilizer might occur in image areas, none of the active ingredients in the image areas are dissolved or dispersed. For this reason, the post-treatment can produce the majority of the ultimate cross linking.
  • mechanical removal means that the coating is not water soluble and is at least about 95 per cent removable with brushes and flushing water.
  • the developing fluid can include a component, such as a surfactant, that is not necessary for the brushes to mechanically remove most of the nonimage material but which helps the brushes pull off remnants adjacent to imaged pixels or dots.
  • the composition of the coating can include a component that interacts with an agent, such as a surfactant, in the aqueous developing fluid, for achieving removal of at least about 98 per cent. But under all circumstances, the active ingredients in the imaged areas are unaffected and can be further cross linked.
  • Figure 1 is a schematic of one embodiment of a pre-press water processor.
  • FIG. 1 is a schematic of the operative components of a representative system for implementing the invention, comprising an exposure unit 100, a developing wash out section 102 and a post treatment section 104.
  • An imaged plate having partially cross-linked image areas and non-image (non-cross linked) areas follows process path 106 to upstream conveying rollers 108 and is thereby conveyed through a tank 110 where the plate is subjected to a developing solution or washout solution 1 12 and heavy brushes 114.
  • the brushes remove the non-image areas from plate while the active ingredients for cross- linking remain intact in the image areas on the plate.
  • the developed plate emerges at 106' from discharge rollers 116 for entering the post treatment station 104, onto an endless belt conveyor 1 18.
  • the plate is guided at 106", under a heater 120 such as an IR lamp which dries and heats the plate.
  • the plate is continuously conveyed under the immediately adjacent a UV lamp 122.
  • the dual or combined post treatment further cross-links the image areas, thereby producing a finished plate that emerges onto ramp 124 for stacking.
  • the hardware for implementing the invention can take a variety of forms, it is represented in the figure as elevated on front and rear legs 126, 128 with room between the legs for components to circulate and filter the wash out solution 1 12. These are shown schematically as a drain 130 leading to a pump 132 which is supported beneath the tank. The pump delivers flow to a filter 134 which is likewise supported, with the filtered solution returned to spray bar 1 12 on line 136.
  • an aqueous developing fluid alone will not remove material to any significant degree. Rather, removal is entirely or substantially entirely due to the mechanical dislodging of non-imaged coating material by the brushes 1 14.
  • any combination of brushes and developer solution that retains at least 95% of the coating weight of the image areas while removing at least 95% of the nonimage areas from the plate may be suitable, whereas retaining at least 98% of the coating weight of the image areas while removing at least 98% of the nonimage areas from the plate is preferable.
  • the coating comprises from about 5 to about 30 wt% based on solids content, of a polymer that is generally considered by practitioners of applied chemistry, as insoluble in water.
  • the polymer material may be selected from a wide range of types such as but not limited to acrylates (especially urethane acylates), siloxanes, and styrene maleic anhydrides.
  • the coating comprises from about 35 to about 75 wt% based on solids content, of a polymerizable monomer, a polymerizable oligomer, or combination thereof that is similarly insoluble in water.
  • a polymerizable monomer e.g., polyethylene glycol dimethacrylate
  • a polymerizable oligomer e.g., polyethylene glycol dimethacrylate
  • radically polymerizable (cross linkable) materials are a multifunctional acrylate such as Sartomer 399 and Sartomer 295 commercially available from Sartomer Co.
  • the coating comprises a non-water-soluble initiator system capable of initiating a polymerization reaction upon exposure to imaging radiation.
  • a non-water-soluble initiator system capable of initiating a polymerization reaction upon exposure to imaging radiation.
  • Some suitable initiator systems comprise a free radical generator such as a triazine or an onium salt.
  • the coating could include from about 5 to about 15 wt% based on solids content of an organic compound that is soluble in organic solvents and only partially soluble in water.
  • Some suitable compounds include a substituted aromatic compound, such as DTTDA (an allyl amide derived from tartaric acid) and tetra methyl tartaramide.
  • DTTDA an allyl amide derived from tartaric acid
  • tetra methyl tartaramide tetra methyl tartaramide.
  • Additional optional components include dyes that absorb the imaging radiation (e.g. infrared absorbing dyes) and pigments or dyes that serve as colorants in the coating.
  • dyes that absorb the imaging radiation e.g. infrared absorbing dyes
  • pigments or dyes that serve as colorants in the coating e.g. infrared absorbing dyes
  • Types of resins can include poly vinyls (poly vinyl acetate, poly vinyl butyral, etc), cellulosic, epoxies, acrylics and others as long as the resin does not produce a strong adhesive bond with the substrate.
  • Monomers and oligomers should be somewhat viscous liquids and can be polyester/polyether, epoxy, urethane acrylates or methacrylates (such as polyether acrylate, polyester acrylate, modified epoxy acrylate, aliphatic urethane methacrylate, aliphatic urethane acrylate oligomers, polyester acrylate oligomers, aromatic urethane acrylate, dipentaerythritol pentaacrylate, pentaacrylate ester, etc.).
  • Formulations #1-3 are consistent with the preferred implementation of the present invention, to the effect that a wide range of ingredients can be used in order to produce a lithographic printing that can be developed using only a mechanical force applied to the coating, without reliance on dissolution or dispersion of the coating in water.
  • All plates having coating formulations #1 -3 are comprised of a substrate with a hydrophilic surface and a very oleophilic radiation sensitive layer, but the mode of development of coating formulations #1-3 relies strictly on the adhesive and cohesive properties of the coating. These coatings as applied and prior to imaging exposure have better cohesive strength than adhesive strength. When the coating is exposed to radiation it undergoes polymerization which greatly amplifies its adhesive and cohesive strengths. [0039] The following list of representative ingredients will enable practitioners in this field to formulate coating compositions that are adapted to a meet targeted performance that balance cost of ingredients, coating process control, shelf life, range of imaging radiation wavelength, type or types of mechanical forces to be used for development, type of fountain and ink on press, and ease of achieving target resolution.
  • non-active water insoluble ingredients can be included such as viscosity agents for facilitating coating of the plate, shelf life stabilizers, and agents for reducing any tendency for removed coating particles to build up in, e.g., a water and rotary brush processor.
  • the solvent can be Arcosolve PM, DMF, and MEK; non-active stabilizers, pigments and the like can include Karenz PE1 and 29S1657 as well as the ACA Z 250.
  • Urethane acrylate resins with active ingredients similar to formulation #2 and various water-insoluble inactive ingredients are presently preferred.
  • residual unimaged material at the base of the image dots can be removed by the action of one or two additional, non ionic surfactants that have high HLB values.
  • the surfactant molecule has one end that has an affinity to water and another end that has an affinity to the oleophilic coating, so the action of the brushes and water turbulence removes the residual coating as if by pulling it off the substrate (as distinguished from dissolving the residual coating).
  • Increased cleanout can also be achieved only with brushes and tap water if the brush impact duration is extended by decreasing the throughput rate.
  • the coating includes a partially water soluble compound
  • the water penetrates the unimaged coating to the substrate whereby the coating separates from the substrate in particulate form with less mechanical action than in the preferred embodiment.
  • the imaged areas have been exposed to sufficient energy to enhance the adhesion to the substrate and the internal cohesion and thereby resist removal during development. This enhancement in the image areas minimizes the penetration of water due to the presence of the partially water soluble compound. Even if some of the material in the image areas is lost during development, enough partially cross linked material remains such that the additional cross linking reactions during post heating provide the desired advantages.
  • Table C shows that over a wide range of IR imaging energy, the hardening of the imaged areas is predominantly dependent on the post heating energy. Even without the UV, one can obtain the advantage of imaging at a low energy/high speed (e.g. 40 to 80- mj), while easily achieving higher durability using post heat temperatures (e.g., 160 C) well above the practical pre-heat limit of 105 deg. C.
  • the table shows that 40 mj imaging with 160 C post heat produces higher cross linking (50% vs. 40%) and much more plate life (1.76% vs. 5.08% color loss) than imaging at 200 mj without pre or post heat.
  • the table also shows that initial radiation imaging at 40 mj or 80 mj, produces 16% and 24% cross linking, respectively. Post heating increases the cross linking to 50% and 52% respectively. As will be shown below, an even higher per cent cross linking can be achieved at a lower post-treatment temperature when combined with UV blanket exposure.
  • O-CI-HABI 2.2'-bis (2-chlorophenyl)-4,4',5,5'-tetraphenyl 1 ,1'- biimidazole, CAS7189-82-4, available from Hampford Research, Stratford, CT.
  • Ethyl Michler's Ketone 4,4 -Bis(diethylamino) benzophenone, CAS90-93-7, available from Signa-Aldrich, Milwaukee, Wl.
  • N-Phenylglycine CAS 103-01-5. available from Sigma- Aldrich, Milwaukee, Wl.
  • Joncryl HPD 671 A high molecular weignt styrene acrylic resin available from BASF Corporation, Florham Park, NJ.
  • Binder A A 33% by weight solution of acrylic resin in 2- butanone, supplied by ZA Chemicals, Wiesbaden, Germany.
  • Cyclomer Z250 A 45% by weight solution of acrylic resin in diprophylene glycol methyl ether, supplied by Cytec Surface Specialities
  • BYK 344 A silicone surface additive supplied by BYK USA Inc., Wallingford, CT.
  • 29S1657 A pigment dispersion comprising phthalocyanine blue 15-4, (59.5 parts), Cyclomer Z250, (87.8 parts), BYK344 (1 part), 1- methoxy-2propanol, (251.7 parts), prepared by Penn Color, Doylestown, PA.
  • SR399 Dispentaerythritol pentaacrylate, available from Sartomer, Exton, PA.
  • FST510 A preparation of >82% Diurethanedimethacrylate in 2-butanone, as supplied by AZ Chemicals, Weisbaden, Germany.
  • Selvol 107 A 10% by weight solution of polyvinylalcohol in water, as supplied by Sekisui America, Mount Laurel, NJ.
  • Selvol 205 A 21 % by weight solution of polyvinylacohol in water, as supplied by Sekisui America, Mount Laurel, NJ.
  • Capstone FS-30 A 25% solution by weight of an ethoxylated nonionic fluorosurfactant in water, as supplied by DuPont, Wilmington, DE.
  • Substrate A 0.012" x 12'x19' aluminum sheet that has been electro-grained, anodized and post-treated with sodium meta silicate.
  • Verti Wash A non-solvent based processing fluid having a slightly alkaline pH, as supplied by Anocoil Corporation, Rockville, CT.
  • N200 developer A conventional subtractive developer, as supplied by Anocoil Corporation, Rockville, CT.
  • NES Opal 850 A cleanout unit used to process and gum plates in a single step, as supplied by NES Worldwide Inc, Westfield, MA.
  • Protek XPH85 A conventional plate processor as supplied by Proteck, Sholinganallur, India.
  • ECRM Mako 4 A violet computer-to-plate setter as supplied by ECRM, Tewksbury, MA.
  • UV Light Frame As supplied by Thiemer Gmbh, Birstein, Germany, using a THS3007 UV bulb for a time and intensity sufficient to produce radiation of 250 mJ/cm 2 , measure using a photometer supplied by International Light of Newburyport, MA.
  • Coatings A and B were applied to Substrate A with a 0.0012" wire- wound bar. The resulting plates were dried in an oven at 90°C for 120 sec. The weight of the dry coating was approximately 1.0gm "2 .
  • Topcoat A was applied to both coatings A and B with a 0.008" wire-wound bar. The topcoat was dried for 120 sec at 90°C. The weight of the dry topcoat was approximately 0.80gm "2 . [0071] The resulting plates were exposed with a test pattern using an ECRM Mako4 set to 100mW laser power (approximately 62 pJ/cm 2 exposure on coating).
  • Example 1 After laser exposure, a plate comprising Coating A was processed through an NES Opal processing unit containing Verti wash at 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the wash and brushes to produce a high definition image. This plate received a score of 4 for the polymerization test.
  • Example 2 After laser exposure, a plate comprising Coating B was processed through an NES Opal processing unit containing Verti wash at 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the wash and brushes to produce a high definition image. This plate received a score of 2 for the polymerization test.
  • Example 3 After laser exposure, a plate comprising Coating A was processed through an NES Opal processing unit containing Verti wash at 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the wash and brushes to produce a high definition image. The plate was the subject to 250 mJ/cm 2 post development UV exposure. This plate received a score of 10 for the polymerization test.
  • Example 4 After laser exposure, a plate comprising Coating B was processed through a NES Opal processing unit containing Verti wash at 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the Verti wash and brushes to produce a high definition image. The plate was then subject to the 250 mJ/cm 2 post development UV exposure. This plate received a score of 10 for the polymerization test.
  • Comparative Example 5 After laser exposure, a plate comprising Coating A was pre-heated at 105°C for 40 seconds, then processed through a NES Opal processing unit containing Verti wash 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the wash and brushes to produce a high definition image. This plate received a score of 7 for the polymerization test.
  • Comparative Example 6 After laser exposure, a plate comprising Coating A was pre-heated at 105°C for 40 seconds, then processed through a NES Opal processing unit containing Verti wash at 72°F. The processing speed was set at 2 feet per minute. Any coating not addressed by the laser was easily removed by the wash and brushes to produce a high definition image. The plate was then subject to the 250 mJ/cm 2 post development UV exposure. This plate received a score of 10 for the polymerization test.
  • Comparative Example 7 After laser exposure, a plate comprising Coating A was processed through a Protek XPH85 processor containing N200 developer at 78°F. The processing speed was set at 4 feet per minute. Any coating not addressed by the laser was easily removed by the developer to produce a high definition image. This plate received a score of 4 or the polymerization test.
  • Comparative Example 8 After laser exposure, a plate comprising Coating A was processed through a Protek XPH85 processor containing N200 developer at 78°F. The processing speed was set at 4 feet per minute. Any coating not addressed by the laser was easily removed by the developer to produce a high definition image. The plate was then subject to 250 mJ/cm 2 post development UV exposure. This plate received a score of 4 for the polymerization test.
  • Comparative Example 9 After laser exposure, a plate comprising Coating A was pre-heated at 105°C for 40 seconds, then processed through a Protek XPH85 processor containing N200 developer at 78°F. The processing speed was set at 4 feet per minute. Any coating not addressed by the laser was easily removed by the developer to produce a high definition image. This plate received a score of 6 for the polymerization test.
  • Comparative Example 10 After laser exposure, a plate comprising Coating A was pre-heated at 105°C for 40 seconds, then processed through a Protek XPH85 processor containing N200 developer at 78°F. The processing speed was set at 4 feet per minute. Any coating not addressed by the laser was easily removed by the developer. The plate was then subject to the 250 mJ/cm 2 post development UV exposure. This plate received a score of 6 for the polymerization test.
  • Example 3 Comparing Example 3 with Example 6: A pre-heat step is unnecessary for satisfactory practice of the present invention.
  • Conventional violet plates utilize a pre-heat step, which is an energy intensive process.
  • Example 7 Comparing Example 7 with Example 8: When the plate is processed in strong chemical developer, the image becomes much less susceptible to post UV exposure.
  • reactions refer to cross linking.
  • the invention can be practiced even if the coating resin is partially dissolved during development, as long as enough unreacted material remains so that the post treatment increases the cross linking The additional cross linking is achieved after all the unimaged coating areas have been removed from the substrate.
  • the unimaged coating areas are removed in part by a chemical effect, such as dispersion or dissolution.
  • the reason for this is that the Verti wash has a mildly alkaline pH.
  • the binder resin is a highly carboxylated styrene/acrylic resin that is soluble at the pH of the Verti wash .
  • the binder resin is not changed; it (and all the other components) are held in place by the matrix formed by the partially cross linked monomer. Since the binder resin is the only component that is alkali soluble (and it is being prevented from solubilizing due to the matrix formed by the partially cross linked monomer) all of the reactive ingredients remain to undergo further cross linking by the post exposure to violet radiation.
  • the coating could have an adhesive promoter to help keep the coating on the substrate before imaging, and the wash could have a surfactant or similar agent for emulsifying the adhesive promoter and thereby helping the mechanical action of the brushes remove the unimaged areas during development.
  • This is in essence, a modified mechanical development.
  • Imaging enables the cross linking of the material in the image areas to become entangled with the rough surface of the substrate and thereby prevent the surfactant from undermining the integrity and active ingredients in the imaged areas. Any loss in coating weight was found to be no more than about one percent, i.e., at least 98% of coating weight is retained.
  • the UV post treatment described above is enhanced by combining it with elevating the temperature of the surface of the plate.
  • Table G shows the resulting benefit. TABLE G
  • the process steps can be implemented in a very compact equipment line.
  • the wash out station 102 including upstream conveyor 108, tank 1 10, brushes 1 14, source 112 of wash out solution, and downstream conveyor 1 16 can be provided within a washout unit having a length ⁇ " less than about two feet in the process direction, preferably only about 18 inches.
  • the overall system of exposure section 100, washout section 102, and post treatment section 104 including ramp 124 with stacking location, can be provided on a footprint measuring less than ten feet, preferably about nine feet, in the process direction.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

L'invention concerne un procédé et un équipement destinés à produire une plaque lithographique, comprenant les étapes consistant à produire une plaque porteuse d'image dotée de zones d'image ayant partiellement réagi comprenant du matériau de revêtement n'ayant pas réagi, ainsi que des zones hors image n'ayant pas du tout réagi ; sans préchauffer la plaque porteuse d'image, amener la plaque porteuse d'image jusqu'à un poste de développement contenant une cuve de développement unique où des brosses rotatives dans une solution aqueuse (i) de lavage dissolvent la couche supérieure, (ii) éliminer uniquement les zones hors image n'ayant pas réagi du substrat tout en conservant du matériau n'ayant pas réagi dans les zones d'image et (iii) condition la surface supérieure de la plaque. La plaque conditionnée est acheminée hors de la cuve et immédiatement soumise à une source externe d'énergie IR et / ou UV qui fait se poursuivre la réaction du matériau n'ayant pas réagi conservé dans les zones d'image.
PCT/US2013/029378 2012-03-06 2013-03-06 Procédé et processeur de développement d'une plaque d'impression lithographique porteuse d'image en lumière violette WO2013134390A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/478,312 US20150053103A1 (en) 2013-03-06 2014-09-05 Method of Developing a Lithographic Printing Plate Including Post Treatment

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US13/413,280 US8785109B2 (en) 2009-09-28 2012-03-06 Method of developing a lithographic printing plate including post heating
US13/413,280 2012-03-06
US201213525445A 2012-06-18 2012-06-18
US13/525,445 2012-06-18

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/478,312 Continuation-In-Part US20150053103A1 (en) 2013-03-06 2014-09-05 Method of Developing a Lithographic Printing Plate Including Post Treatment

Publications (2)

Publication Number Publication Date
WO2013134390A2 true WO2013134390A2 (fr) 2013-09-12
WO2013134390A3 WO2013134390A3 (fr) 2014-03-20

Family

ID=49117297

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/US2013/029378 WO2013134390A2 (fr) 2012-03-06 2013-03-06 Procédé et processeur de développement d'une plaque d'impression lithographique porteuse d'image en lumière violette
PCT/US2013/029387 WO2013134395A1 (fr) 2012-03-06 2013-03-06 Procédé de développement d'une plaque d'impression lithographique comprenant un double post-traitement

Family Applications After (1)

Application Number Title Priority Date Filing Date
PCT/US2013/029387 WO2013134395A1 (fr) 2012-03-06 2013-03-06 Procédé de développement d'une plaque d'impression lithographique comprenant un double post-traitement

Country Status (1)

Country Link
WO (2) WO2013134390A2 (fr)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5223041A (en) * 1988-05-31 1993-06-29 Cerney Donald E Apparatus and process for processing printing plates
US5091287A (en) * 1990-04-10 1992-02-25 Minnesota Mining And Manufacturing Company Photoreactive oligomer composition and printing plate
US6943124B1 (en) * 2002-07-17 2005-09-13 Taiwan Semiconductor Manufacturing Company Two step exposure to strengthen structure of polyimide or negative tone photosensitive material
US7013806B2 (en) * 2003-05-28 2006-03-21 Anocoil Corporation Method and apparatus for applying a film of developer fluid onto a lithographic printing plate in a developing station
US8137897B2 (en) * 2005-07-29 2012-03-20 Anocoil Corporation Processless development of printing plate
JP2007101693A (ja) * 2005-09-30 2007-04-19 Fujifilm Corp 平版印刷版原版
EP1952201B1 (fr) * 2005-11-18 2011-01-12 Agfa Graphics N.V. Procede de fabrication d'une plaque d'impression photopolymere
US8354216B2 (en) * 2008-07-15 2013-01-15 Eastman Kodak Company Negative-working imaging elements and methods of use
US8304170B2 (en) * 2008-09-04 2012-11-06 Eastman Kodak Company Negative-working imageable element and method of use

Also Published As

Publication number Publication date
WO2013134390A3 (fr) 2014-03-20
WO2013134395A1 (fr) 2013-09-12

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