EP0281727B1 - Procédé de fabrication d'une plaque lithographique, l'utilisation d'une telle plaque pour l'impression et procédé d'impression avec une telle plaque d'impression - Google Patents

Procédé de fabrication d'une plaque lithographique, l'utilisation d'une telle plaque pour l'impression et procédé d'impression avec une telle plaque d'impression Download PDF

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Publication number
EP0281727B1
EP0281727B1 EP19880100453 EP88100453A EP0281727B1 EP 0281727 B1 EP0281727 B1 EP 0281727B1 EP 19880100453 EP19880100453 EP 19880100453 EP 88100453 A EP88100453 A EP 88100453A EP 0281727 B1 EP0281727 B1 EP 0281727B1
Authority
EP
European Patent Office
Prior art keywords
printing
layer
photoreceptor
photosensitive layer
printing plate
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP19880100453
Other languages
German (de)
English (en)
Other versions
EP0281727A2 (fr
EP0281727A3 (en
Inventor
Shigeyoshi Suzuki
Akira Furukawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Paper Mills Ltd
Original Assignee
Mitsubishi Paper Mills Ltd
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
Priority claimed from JP62054450A external-priority patent/JPH0750339B2/ja
Priority claimed from JP62092436A external-priority patent/JPH0814728B2/ja
Application filed by Mitsubishi Paper Mills Ltd filed Critical Mitsubishi Paper Mills Ltd
Publication of EP0281727A2 publication Critical patent/EP0281727A2/fr
Publication of EP0281727A3 publication Critical patent/EP0281727A3/en
Application granted granted Critical
Publication of EP0281727B1 publication Critical patent/EP0281727B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G13/00—Electrographic processes using a charge pattern
    • G03G13/26—Electrographic processes using a charge pattern for the production of printing plates for non-xerographic printing processes
    • G03G13/28—Planographic printing plates
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G5/00—Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor
    • G03G5/02—Charge-receiving layers
    • G03G5/0202—Dielectric layers for electrography

Definitions

  • This invention relates to a method for making a printing plate and a method of printing.
  • PS presensitized
  • printing plates of high sensitivity and high printing endurance those comprising an aluminum plate on which an organic photoconductive compound is coated are disclosed, for example, in Japanese Patent Examined Publication Nos. 17162/62, 6961/63, 2426/66 and 39405/71 and Japanese Patent Unexamined Publication Nos. 19509/75, 19510/75, 145538/79, 89801/79, 134632/79, 19803/79, 105254/80, 161863/82, 76843/83, 76844/83, 118658/83 and 244959/85.
  • These printing plates are made through the steps of corona charging, camera exposure or laser exposure, wet or dry-type development, fixation and etching of the non-image area with alkaline solution.
  • the prior art printing sheets comprise a conductive support having thereon a polymer layer placed opposite to a phototransducer having also a conductive layer. Voltage is applied to said conductive supports to generate electric charge at the phototransducer, which is exposed to light to produce discharge between the phototransducer and the polymer layer thereby to allow a chemical reaction to take place on the surface of the polymer layer. The voltage applied is rather high.
  • the gist of this invention resides in a method for making a lithographic printing plate, characterized by forming a positive electrostatic latent image on a dielectric non-photosensitive layer provided on a conductive support of printing sheet for lithographic printing plate by the process mentioned hereinafter and then subjecting the latent image to at least development and fixation.
  • the characteristics of the plate are stable to the changes of circumstances where the plate is made and further, uniform printed images can be obtained even if a printing plate of large size such as the whole kiku size (636 mm x 939 mm) is made by laser scanner exposure method.
  • said non-photosensitive layer namely, printing layer can be made as thin as possible i.e. 5 ⁇ m or less and thus resist property of the printing plate of which non-image area is removed by etching with alkaline solution can be improved and printing plates of high printing endurance can be obtained.
  • the photoreceptor which is separated from the printing sheet is used and not only this photoreceptor can be repeatedly used, but the printing sheet can also be reused by removing toner or printing layer of the once used printing plate (in the latter case, only by coating a dielectric non-photosensitive layer on the support of the printing plate once used).
  • the economical advantage is great.
  • a printing sheet comprising a conductive support having thereon a dielectric non-photosensitive layer and a photoreceptor having a conductive layer are placed opposite to each other and this assembly is subjected to imagewise exposure from a light transmitting side, generally, light transmitting photoreceptor side while applying a direct voltage between the conductive support of the printing sheet and the conductive layer of the photoreceptor from a direct current source, to thereby form a positive electrostatic latent image on said non-photosensitive layer, which is then developed with a developer having polarity opposite to that of the latent image and is fixed.
  • this positive electrostatic latent image is not necessarily clear, but some mechanism can be thought of. That is, one is that in the area irradiated with light, internal discharge occurs at the air-gap between the printing sheet and the photoreceptor where the voltage is above the break-down voltage due to the decrease in resistivity of photoreceptor, whereby charge is accumulated on said non-photosensitive layer resulting in formation of an electrostatic latent image. Another one is that movable carrier formed in the area irradiated with light is injected and transferred into the dielectric surface by the action of external electrical field or charge is injected into said area from electrode surface and transfers to the dielectric surface, whereby an electrostatic image is formed thereon.
  • This invention is not limited to the mechanism of image formation and forms a positive electrostatic image on the exposed area by laser exposure or exposure to a negative original through the above mentioned processes.
  • Examples of the conductive supports used in the printing plate of this invention are preferably metal sheets such as aluminum sheet, zinc sheet, iron sheet, copper sheet. Further, metal-deposited films, metal foil-laminated films or films subjected to conductive treatment may also be used.
  • the non-photosensitive layer coated on the support comprises a resin which can trap the charge transferred from photoreceptor as dielectric or insulator and can be etched with alkaline solutions.
  • resins mention may be made of, for example, those which contain at least one component of a copolymer, a monomer containing acidic group such as acrylic acid, methacrylic acid, crotonic acid, for example, styrene-maleic anhydride copolymer, maleic ester resin, vinyl acetate-crotonic acid copolymer, vinyl acetate-maleic anhydride copolymer, (meth)acrylic ester-(meth)acrylic acid copolymer, acrylic acid half ester, and furthermore, phenolic resin.
  • a monomer containing acidic group such as acrylic acid, methacrylic acid, crotonic acid, for example, styrene-maleic anhydride copolymer, maleic ester resin, vinyl acetate-crotonic acid copolymer, vinyl acetate-maleic anhydride copolymer, (meth)acrylic ester-(meth)acrylic acid copolymer, acrylic acid half ester, and
  • a layer of these resins can be made as thin as 5 ⁇ m or less, sometimes as thin as 2 ⁇ m or less, even a tough film required for the printing plate can be easily etched.
  • the printing plate of this invention is an anodized aluminum sheet and in this case the aluminum oxide layer constitutes the dielectric non-photosensitive layer, which also serves as hydrophilic surface. That is, according to this invention, when the dielectric non-photosensitive layer on the conductive support per se has a sufficient hydrophilicity or can be converted to a hydrophilic layer, the printing plate can be made without removing the non-image area by etching.
  • An example referring to the possibility of rendering the non-image area hydrophilic after development and fixation is to use a non-photosensitive layer comprising an insulating resin having dispersed therein zinc oxide which undergoes substantially no exposure due to the difference in sensitivity or sensitive wavelength when the photoreceptor is exposed and to hydrophilize this layer, for example, with a hydrophilizing solution containing, for example, potassium ferrocyanide.
  • a printing sheet comprising a conductive support on which a compound or a web such as film which is per se hydrophilic and insulating is coated or laminated.
  • photoreceptors in this invention there may be used those which are generally used for electrophotographic systems, but since non-light transmitting printing sheets are often used, a light transmitting support such as film or glass is used as support for the photoreceptor and besides this support for the photoreceptor must have conductivity for forming an electrode with the printing sheet.
  • a photoconductive compound sensitive to laser beam as mentioned before is preferred as the photoreceptor component.
  • organic photoconductors such as azo pigments, copper-phthalocyanine, PVK-TNF, or inorganic photoconductors such as non-crystalline selenium and cadmium sulfide. These may be of function-separated type.
  • a printing sheet and a photoreceptor placed opposite to each other are subjected to imagewise exposure while applying a suitable voltage (generally 400 V or higher) between the printing sheet and the photoreceptor.
  • the printing sheet and the photoreceptor may be brought into close contact with each other or they may be positioned with providing a suitable air space therebetween (generally, about 1-20 ⁇ m) when the voltage of the latent image is to be increased.
  • the air space can be provided by forming a uniform irregularity on the surface of the printing sheet or the photoreceptor. Specifically, the air space can be provided by allowing fine particles of suitable particle size to be exposed on the surface of the printing sheet or the photoreceptor and bringing them in contact with each other.
  • the surface of the non-photosensitive layer namely, the printing sheet is roughened by fine particles, resist property or etching speed of etching non-image area with alkaline solution are improved and a printing plate of high resolving power and high alkaline endurance can be obtained.
  • a non-photosensitive layer having a surface roughened by fine particles forms a uniform space with the photoreceptor placed opposite to the roughened surface of the non-image layer at the time of exposure, whereby the applied voltage can be made uniform and reproducibility can be enhanced.
  • the fine particles used for the above purpose are of organic or inorganic compounds and of about 1 to about 20 ⁇ m, preferably about 3 to about 15 ⁇ m in average particle size.
  • These fine particles are dispersed in the dielectric and alkali-soluble non-photosensitive layer and must not be those which are dissolved or molten during the preparation of the coating liquid for the non-photosensitive layer and formation of the coating film to become miscible with the alkali-soluble resin.
  • organic fine particles such as of polystyrene; crosslinked copolymers of styrene and divinylbenzene; copolymers of styrene and unsaturated carboxylic acids such as acrylic acid; copolymers of styrene and (meth)acrylic acid lower alkyl esters or styrene, (meth)acrylic acid lower alkyl esters and unsaturated carboxylic acid such as acrylic acid; polymethyl methacrylate; copolymers of methyl methacrylate and (meth)acrylic acid lower alkyl esters or methyl methacrylate, (meth)acrylic acid lower alkyl ester and unsaturated carboxylic acid such as acrylic acid, inorganic fine particles such as of silicon dioxide, titanium dioxide, zinc oxide, calcium carbonate, composite fine particles of organic and inorganic materials, crosslinked organic fine particles.
  • organic fine particles such as of polystyrene; crosslinked copolymers of styrene and divinylbenz
  • one or more kinds of these fine particles are contained in the non-photosensitive layer in an amount of about 0.1 to about 5% by weight, but they may be used in an amount outside said range.
  • Height of irregularity on the roughened surface is preferably about 0.5 to about 10 ⁇ m, but it may be outside this range.
  • Toners used for image formation may be either dry or wet toners, but wet toners for liquid developing are more preferred than dry toners for obtaining printing plates of superior resolving power. Further, the toner is required to be hydrophobic and ink receptive and have enough adhesiveness to stand printing. The toner is further required to have resist property when etching with alkali and/or alcohol solution is carried out.
  • alkalis used for the etching solution mention may be made of, for example, sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium phosphate, potassium phosphate and ammonia.
  • alcohols mention may be made of, for example, lower alcohols or aromatic alcohols such as menthanol, ethanol, propanol and benzyl alcohol; ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol and cellosolve.
  • the etching treatment can also be effected with aqueous alkali solution alone or alcohol alone.
  • a dispersion of copper-phthalocyanine in an acrylic resin was coated on a transparent conductive film (IP-001 of Mitsubishi Chemical Industries, Ltd.) and dried to obtain a photoreceptor.
  • phenolic resin was coated on an anodized aluminum sheet at 2 g/m2 and dried to obtain a printing sheet.
  • Said photoreceptor and printing sheet (both in B5 size) were put together so that the coated sides contacted with each other and imagewise exposure was effected from backside of the photoreceptor through a transparent negative original while applying externally a voltage of 400 V between the photoreceptor and printing sheet from a direct current source.
  • this printing sheet After switching off the voltage, this printing sheet was subjected to development with liquid toner and fixation to obtain a positive image having a maximum image density of 1.5 and free from fog. Further, this printing sheet was subjected to etching with the above etching solution resulting in removal of non-image area in 15 seconds to obtain a printing plate having a resist image of good resolving power. A lot of prints could be made on a printing machine by this printing plate.
  • This example was repeated using this printing sheet and the same photoreceptor used above to obtain a printing plate of similarly high printing endurance.
  • a printing plate was made by exposure, development and fixation in the same manner as in Example 1 except that fine particles were dispersed in the photoreceptor and an anodized aluminum sheet per se was used as the printing sheet.
  • This printing plate had maximum image density of 0.7 and was free from fog.
  • This printing plate can be used again as a printing sheet by removing only the toner image with a solvent after used for printing.
  • a dispersion of copper-phthalocyanine in acrylic resin was coated on a transparent conductive film (IP-001 of Mitsubishi Chemical Industries, Ltd.) and dried to make a photoreceptor.
  • phenolic resin at 2 g/m2 and monodispersing polystyrene fine particles of 4 ⁇ m in average particle size at 0.04 g/m2 and the coat was dried to obtain a printing sheet.
  • the photoreceptor and printing sheet (both in A3 size) were put together so that the coated sides thereof contacted with each other and subjected to exposure, development and fixation in the same manner as in Example 1 to obtain a good positive image of high density and free of fog without causing unsatisfactory contact in spite of the large size.
  • the image carrying printing sheet was subjected to etching with said etching solution to remove the non-image area in 9 seconds.
  • the resulting printing plate had a high printing endurance of such a degree that printing of 100,000 printed copies can be performed.
  • Example 3 was repeated except that 5 g/m2 of styrene-butyl methacrylate-acrylic acid (60:20:20 by weight) copolymer was used in place of phenolic resin and 0.1 g/m2 of polymethyl acrylate of 10 ⁇ m in average particle size was used in place of polystyrene fine particles.
  • the photoreceptor used in Example 3 was reused here.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Printing Plates And Materials Therefor (AREA)

Claims (9)

  1. Procédé pour la fabrication d'une plaque d'impression lithographique qui comprend la mise en place d'une feuille d'impression incorporant un support conducteur sur lequel est appliqué une couche non photosensible diélectrique et un photorécepteur ayant une couche de photorécepteur et une couche conductrice de sorte que la couche non photosensible et la couche de photorécepteur sont opposées l'une à l'autre, la mise en exposition par image de la couche du photorécepteur à travers la feuille d'impression ou du photorécepteur selon que la feuille d'impression ou le photorécepteur transmet la lumière tout en appliquant une tension continue entre le support conducteur et la couche conductrice au moyen d'une source de courant continu pour former une image latente électrostatique positive sur la couche non photosensible de la feuille d'impression et, après séparation du photorécepteur de la feuille d'impression, soumettre l'image à au moins un développement et une fixation, procédé caractérisé en ce que l'on utilise une couche non photosensible diélectrique ayant une épaisseur de 5 µm ou moins.
  2. Procédé selon la revendication 1, dans lequel le support conducteur est une feuille d'aluminium anodisée et la couche non photosensible comprend une résine soluble en solution alcaline.
  3. Procédé selon la revendication 2, dans lequel la zone de non-image est enlevée par attaque après développement et fixation.
  4. Procédé selon la revendication 1, dans lequel la couche non photosensible est une couche de résine dont la surface a été rendue rugueuse par des particules fines.
  5. Procédé selon la revendication 1, dans lequel la couche non photosensible est une couche hydrophile ou une couche pouvant être convertie en une couche hydrophile.
  6. Procédé selon la revendication 4, dans lequel les particules fines ont une granulométrie moyenne d'environ 3 à environ 15 µm.
  7. Procédé selon la revendication 4, dans lequel la quantité de particules fines est d'environ 0,1 jusqu'à environ 5 % en poids de la couche non photosensible.
  8. Procédé d'impression qui comprend le montage d'une plaque d'impression lithographique réalisée selon le procédé de l'une quelconque des revendications précédentes sur une machine d'impression et réalisation de l'impression.
  9. Utilisation d'une plaque d'impression réalisée selon le procédé de l'une quelconque des revendications 1 à 7, pour l'impression d'une image sur un substrat.
EP19880100453 1987-03-09 1988-01-14 Procédé de fabrication d'une plaque lithographique, l'utilisation d'une telle plaque pour l'impression et procédé d'impression avec une telle plaque d'impression Expired - Lifetime EP0281727B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP54450/87 1987-03-09
JP62054450A JPH0750339B2 (ja) 1987-03-09 1987-03-09 平版印刷版の作成方法
JP92436/87 1987-04-14
JP62092436A JPH0814728B2 (ja) 1987-04-14 1987-04-14 平版印刷版の作成方法

Publications (3)

Publication Number Publication Date
EP0281727A2 EP0281727A2 (fr) 1988-09-14
EP0281727A3 EP0281727A3 (en) 1990-01-31
EP0281727B1 true EP0281727B1 (fr) 1993-09-08

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Application Number Title Priority Date Filing Date
EP19880100453 Expired - Lifetime EP0281727B1 (fr) 1987-03-09 1988-01-14 Procédé de fabrication d'une plaque lithographique, l'utilisation d'une telle plaque pour l'impression et procédé d'impression avec une telle plaque d'impression

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EP (1) EP0281727B1 (fr)
DE (1) DE3883811T2 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991004518A1 (fr) * 1989-09-21 1991-04-04 Dai Nippon Printing Co., Ltd. Presse d'imprimerie utilisant un milieu de retention de charge, son procede de fabrication et systeme de depouillement utilisant le milieu de retention de charge
JP2000098831A (ja) * 1998-09-21 2000-04-07 Mitsubishi Heavy Ind Ltd 印刷用版材の再生方法及び印刷機
JP3504158B2 (ja) 1998-09-29 2004-03-08 株式会社東芝 周波数変換機能を有するａ／ｄ変換装置及びこれを用いた無線機

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3554125A (en) * 1967-04-26 1971-01-12 Xerox Corp Method of making a lithographic master and method of printing therewith

Also Published As

Publication number Publication date
DE3883811D1 (de) 1993-10-14
EP0281727A2 (fr) 1988-09-14
EP0281727A3 (en) 1990-01-31
DE3883811T2 (de) 1994-02-24

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