JPH0854730A - Plate making method and plate making device - Google Patents

Abstract

PURPOSE:To provide a plate making method and a plate making device which can be used even in a small factory or office so that easy and simple plate making is possible and a printing plate having high printing durability can be obtd. CONSTITUTION:A master plate 10 for printing having at least a hydrophilic layer, photosensitive resin layer which can be developed and removed, and ink accepting layer having peeling property is used. The plate making method and the device includes a process to form an ink image which influences the photosensitivity of the photosensitive layer by driving an ink-jet recording head by electric signals according to the image signals to inject an ink to the ink- accepting layer formed on the photosensitive resin layer of the master plate, a process to expose the printing master plate 10 with the ink image formed, and a process to develop while the ink accepting layer is peeled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate making method and a plate making apparatus for a printing plate, and more particularly to a simple printing plate making method and a plate making apparatus using an ink jet recording system.

[0002]

2. Description of the Related Art Conventionally, printing methods such as lithographic printing, letterpress printing and intaglio printing have been widely used as printing methods.
They are mainly used for factory mass printing.
The printing plate used in these printing methods is obtained by making a negative or positive mask pattern from a document by a silver salt photographic method, exposing the printing plate having a photosensitive resin layer through this mask pattern, and then developing. In particular, for full-color image printing, cyan, magenta, yellow and black plates are prepared respectively, and these plates reproduce the full-color image of the original document. Such a silver salt photographic method is preferable because a printing plate having sufficient printing durability can be obtained, but the plate making process is long and complicated, and the cost of silver is high. It is unsatisfactory as a simple printing method to be used in such cases.

Therefore, as a printing method used in small factories and various offices, the stencil method has been used for a long time. In recent years, the electrostatic printing method has been widely used as a quick and simple small-scale printing method that can be performed in these offices. Of the above simple printing methods,
The method using the electrostatic printing method is a quick and simple method, but since a toner image is formed using a zinc oxide coating sheet as a photoconductor and this is used as a printing plate (offset master), the toner is used. There is a problem that the image does not have sufficient strength for the offset printing method, and thus the printing durability is insufficient.

Further, the method of using various printers has an advantage that a printing plate is not used, but is not suitable for the use requiring a large amount of copies. In particular, the method using a thermal transfer type or sublimation type printer using an ink ribbon has a problem that the ribbon consumption becomes enormous. Therefore, it is possible to provide a printing plate with high printing durability, which can be used in small factories and various offices, can easily and easily make a plate, and can print several thousand to tens of thousands of sheets. There is a demand for a technology that can.

On the other hand, the present applicant has already proposed a plate-making method by utilizing a conventionally known ink jet recording system for plate-making in order to meet the above-mentioned demand (described in JP-A-63-109052). . In this method, an ink jet head is operated by an electric signal corresponding to an image signal to form an ink image on the printing plate having a photosensitive resin layer, which affects the photosensitivity of the photosensitive resin layer, and then the exposure is performed. Then, the plate making method is characterized in that development is carried out if necessary.

However, in the plate-making method described above, the photosensitive resin layer is directly subjected to ink jet recording and then developed as needed. In this case, the developing system is water or an alkaline developing solution. However, there is a problem that the non-crosslinked portion of is eluted. That is, since the developing process is a wet process using an organic solvent or water,
The solution management of the developing solution, the maintenance of the apparatus, the waste solution treatment, and the like are complicated, and there is a problem of environmental pollution due to the solvent. Further, the apparatus becomes large in size and costly.

As a printing plate for solving these problems, a tackiness produced by light irradiation to a printing plate precursor having a peelable and developable photosensitive layer provided on a support and a release layer made of polyester or the like provided thereon Development method that utilizes the difference between
A printing plate produced by using a dry development method by a so-called peel apart process is known, and is disclosed in Japanese Patent Publication No. 38-9663.
No. 4, JP-B-43-22901, JP-A-47-7728.
Japanese Patent Publication No. 48-43126, Japanese Patent Publication No. 55-5024.
6, JP-A-57-58141 and JP-A-57-620.
46, Japanese Patent Publication No. 64-10055 and Japanese Patent Publication No. 64-1
No. 0056, Japanese Patent Publication No. 1-45899 and the like. However, in the dry development method by peel apart treatment described in these, the process is complicated because the wet development is performed after the exposure is performed by further applying a mask by the silver salt photographic method on the release layer. In addition, there is a problem in that liquid management is inconvenient.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a printing plate which can be used easily in small factories and various offices, can be easily and easily manufactured, and has high printing durability. It is to provide a plate making method and a plate making apparatus provided.

[0009]

The above object can be achieved by the present invention described below. That is, the present invention uses a printing original plate comprising at least a hydrophilic layer, a peelable and developable photosensitive resin layer, and a releasable ink receiving layer, and is provided on the photosensitive resin layer of the printing original plate. A step of forming an ink image on the ink receiving layer by activating an ink jet recording head by an electric signal corresponding to an image signal to eject ink to form an ink image that affects the photosensitivity of the photosensitive resin layer; A plate making method and a plate making apparatus characterized by comprising: a step of exposing a printing original plate to be used; and a step of peeling off the ink receiving layer and developing at the same time.

[0010]

The present inventor, as a result of earnest research to solve the above-mentioned problems of the prior art, used a printing plate having an ink receiving layer having a peeling property on a photosensitive resin layer, An ink image that affects the photosensitivity of the photosensitive resin layer is formed on the ink receiving layer by driving an inkjet head with an image signal obtained by digitally processing input data from a scanner or the like by a computer, and then the ink image is formed. By exposing the printing original plate on which is formed, a polymerized and unpolymerized portion is formed in the photosensitive resin layer to form a portion having different adhesiveness (tackiness), and then the photosensitive resin layer is formed. The present invention was accomplished by discovering that a printing plate can be obtained easily and simply by peeling off the unpolymerized portion of the ink with the ink receiving layer and developing the same at the same time. That is, according to the present invention, since the dry development is performed without using the wet method, there are no problems such as liquid management and waste liquid that occur when the conventional wet development method is adopted, and the process is A simple plate-making method is provided, and a plate-making apparatus that is easy to maintain is provided.

[0011]

The present invention will be described in more detail below with reference to examples of the present invention. First, both FIG. 1 and FIG. 2 are schematic cross-sectional views showing an example of a printing original plate used in the present invention. The printing original plate used in the present invention comprises at least a hydrophilic layer, a peelable and developable photosensitive resin layer (hereinafter referred to as a photosensitive layer) containing a polymerizable compound, which is provided on the hydrophilic layer. And a releasable ink-receiving layer. As a concrete example of such an original plate for printing,
For example, as shown in FIG. 1, a hydrophilic layer 2, a peelable and developable photosensitive layer 3, and an ink receiving layer 4 having both a peeling supporting function and an ink receiving function are sequentially laminated on a support 1. It may be configured, or as shown in FIG.
The peeling support layer 5 is provided separately from the ink receiving layer 4, and the support 1
A hydrophilic layer 2, a peelable and developable photosensitive layer 3 thereon, a peeling support layer 5 thereon, and an ink receiving layer 4 thereon may be laminated in this order.

Next, materials and the like for each layer constituting the printing original plate used in the present invention will be described. The support 1 constituting the printing original plate used in the present invention includes the support 1
Any support may be used as long as the hydrophilic layer 2 to be laminated thereon can be strongly adhered, and a wide range of materials can be selected. For example, metals such as aluminum, zinc, copper, and steel; plastic films such as polyethylene terephthalate, polyvinyl chloride, and polycarbonate; resin-coated films; paper, wet-strength paper, resin-coated paper, metal foil of aluminum or copper Paper; Rubber; Glass; and composites thereof, for example, a metal plate having a rubber elastic layer, a plastic film, glass, paper; a metal such as aluminum, zinc, copper, nickel, chromium, and iron is plated, vapor-deposited, or sputtered. The metal plate, plastic film, glass, paper and the like which have been prepared can be preferably used. Further, for the purpose of improving the adhesive strength between the support 1 and the hydrophilic layer 2 as described above, an intermediate layer is provided between the support 1 and the hydrophilic layer 2 by means such as coating an anchor agent on the support 1. May be formed.

The hydrophilic layer 2 which is laminated on the above-mentioned support 1 and constitutes the printing plate for use in the present invention may contain at least a layer-forming polymer substance.
A polymerizable compound may be contained. The layer-forming polymer substance mentioned here is a polymer substance capable of forming a layered film and can be selected from a wide range of resins generally used as a binder. Among these, resins exhibiting hydrophilicity are particularly preferable, and specifically, for example, plant-based polymers such as guar gum, locust bean gum, gum arabic, tragacanth, carrageenan, bectin, mannan, starch; xanthan gum, dextrin, succinoglucan. , Microbial polymers such as curdlan; animal-based polymers such as gelatin, casein, albumin, collagen; methyl cellulose, ethyl cellulose,
Cellulosic polymers such as carboxymethyl cellulose and hydroxyethyl cellulose, or soluble starch,
Starch polymers such as carboxymethyl starch and methyl starch, alginate polymers such as propylene glycol alginate and alginate, and semi-synthetic polymers such as polysaccharide derivatives; polyvinyl alcohol, polyvinyl pyrrolidone, polyvinyl methyl ether, carboxy Vinyl-based polymers such as vinyl polymers, sodium polyacrylate, polyacrylamide, poly-methacrylic acid, polyacrylonitrile; other synthetic polymers such as polyethylene glycol and ethylene oxide / propylene oxide block copolymers; Those to which silicon, titanium dioxide, silica, clay, cross-linking agent (waterproofing agent), surfactant, etc. are added; JP-B-2-15383, JP-A-2-80472, JP-A-2-105873, JP-A-2-105873 1-238935 The hydrophilic polymers described in JP-A-2-110119, JP-A-2-107678, and JP-A-2-72, and the like, which themselves are hydrophobic, but which can be treated with an etchant or a fountain solution. Resins containing a functional group capable of generating a hydrophilic group by hydrolysis or hydrogenolysis are also preferable, and JP-A-1-306856 and JP-A-1-3068 are also preferable.
55, JP-A 1-267093, JP-A 1-269.
The resins and the like described in each publication of No. 593 can be mentioned. These can be used alone or in combination of two or more as required.

Most of the above-mentioned hydrophilic resins are water-soluble, and examples of the cross-linking agent for imparting water resistance include melamine-formalin resin, urea-formalin resin, polyamide polyaminoepichlorohydrin resin, ketone-formalin. Resin, methylolated polyamide resin,
Glyoxal or a polyvalent metal salt can be used.

In the peel apart developing method adopted in the present invention, the difference between the polymerization and non-polymerization of the photosensitive layer when irradiated with light is utilized, and the adhesive force between the photosensitive layer and the ink receiving layer (release support layer) is used. (Adhesive force) and the adhesive force (adhesive force) between the photosensitive layer and the hydrophilic layer cause a difference in strength and weakness, and when the ink receiving layer is peeled off, the unpolymerized portion of the photosensitive layer is peeled off at the same time. To form. Therefore, if an appropriate polymerizable compound is contained in the hydrophilic layer according to the selection of the materials of the ink receiving layer (release support layer) and the photosensitive layer, the polymerized portion of the hydrophilic layer and the photosensitive layer can be further increased. It becomes possible to strengthen the adhesive force with and to obtain a clear image. As the polymerizable compound used at this time, a compound having at least one reactive vinyl group in one molecule can be used,
For example, one or more selected from the group consisting of a reactive vinyl group-containing monomer, a reactive vinyl group-containing oligomer and a reactive vinyl group-containing polymer can be used. As the reactive vinyl group of these compounds, in addition to a styrene-based vinyl group, a (meth) acrylic acid-based vinyl group, an allyl-based vinyl group, vinyl ether, etc., there is a polymerization reactivity such as an ester-based vinyl group such as vinyl acetate. A substituent or an unsubstituted vinyl group is mentioned. Here, the term “(meth) acrylic acid type” means both methacrylic acid and acrylic acid.

Among the polymerizable compounds satisfying the above conditions,
First, as the polymerizable compound exhibiting hydrophilicity, those containing hydrophilicity such as a hydroxyl group, an alkoxy group, a galboxyl group, an amide group, an imide group, an amino nitrogen sulfone group, an ammonium group, and a phosphoric acid group can be mentioned. Specifically, for example, 2-hydroxyethyl (meth) acrylate, 2
Hydroxyl group-containing polymerizable compounds such as hydroxypropyl (meth) acrylate, butanediol monoacrylate, glycerol mono (meth) acrylate, glycerol di (meth) acrylate, glycerol methacrylate acrylate; 2-methoxyethyl (meth) acrylate, 2- Alkoxy group-containing polymerizable compounds such as ethoxyethyl (meth) acrylate; amino nitrogen-containing polymerizable compounds such as t-butylaminoethyl (meth) acrylate and N, N-dimethylaminoethyl (meth) acrylate; polyethylene glycol mono (Meth) acrylate, polypropylene glycol mono (meth) acrylate, polyethylene glycol di (meth) acrylate,
A 1: 1, 1: 2 adduct of diol such as neopentyl glycol di (meth) acrylate and (meth) acrylic acid;
Ethylene glycol diglycidyl ether di (meta)
Acrylate, polyethylene glycol diglycidyl ether di (meth) acrylate, polypropylene glycol diglycidyl ether di (meth) acrylate, neopentyl glycol diglycidyl ether di (meth) acrylate, glycerin diglycidyl ether di (meth) acrylate, bisphenol A, diol such as diglycidyl ether di (meth) acrylate, trimethylolpropane triglycidyl ether di (meth) acrylate, 1: 2 addition product of diglycidyl ether and acrylic acid; pentaerythritol mono (meth)
Acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol mono (meth) acrylate, dipentaerythritol di (meth) acrylate,
Pentaerythritol derivatives such as dipentaerythritol tri (meth) acrylate, dipentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate; (meth) acrylic acid,
(Meth) acrylic acid metal salt, acrylic acid dimer; (meth) acrylamide, dimethylaminopropyl (meth)
Acrylamide, N-methylol (meth) acrylamide, t-butyl (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N-ethoxymethyl (meth) acrylamide, Nn-butoxy (meth) acrylamide, N, N- Dimethylaminopropyl (meth) acrylamide, ethylenedi (meth) acrylamide, propylenedi (meth) acrylamide, 1,4 phenylenedi (meth) acrylamide, ethylenetetra (meth) acrylamide, propylenetetra (meth) acrylamide, methylenebis (meth) acrylamide , Acrylamide-glyoxal adduct, acrylamide
Methylol ethylene urea condensate, 1,3,5-triacryloylhexahydro-S-triazine, N, N-diallyl acrylamide, acrylamide / methylol melamine condensate, acrylamide / methylol triazine condensate, acrylamide / methylol hydantoin condensate, acrylamide -Acrylamido derivatives such as methylol urea and N, N-diallyl acrylamide; sulfo group-containing polymerizable compounds such as 2- (meth) acrylamido-2-methylpropanesulfonic acid; (meth) acrylamidopropyltrimethylammonium chloride; (meth) Ammonium base-containing polymerizable compounds such as acryloyloxyethyl trimethyl ammonium chloride;
Phosphoric acid group-containing polymerizable compound such as mono (2- (meth) acryloyloxyethyl) acid phosphate; N-
(Meth) acryloylmorpholine, tetrahydrofurfuryl (meth) acrylate, vinyl acetate, acrylonitrile, N-vinylcaprolactam, N-vinylpyrrolidone, and the like, as well as hydrophilic oligomers or polymers (for example, the hydrophilic binder described above). Etc.), a polymerizable compound having a reactive vinyl group remaining at the terminal, or a polymerizable compound having a reactive vinyl group attached to the side chain of a hydrophilic oligomer or polymer.

It is also possible to use a lipophilic polymerizable compound which is not hydrophilic, for example, styrene, methylstyrene, chlorostyrene, bromostyrene, methoxystyrene, dimethylaminostyrene, cyanostyrene, nitrostyrene, hydroxystyrene. , Aminostyrene, carboxystyrene, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate,
Cyclohexyl (meth) acrylate, phenyl (meth) acrylate, vinyl pyridine, propyl vinyl ether, butyl vinyl ether, isobutyl vinyl ether, β-chloroethyl vinyl ether, phenyl vinyl ether, (para) methyl phenyl vinyl ether,
Monovalent monomers such as (para) chlorophenyl vinyl ether; divinylbenzene, distyryl oxalate, distyryl malonate, distyryl succinate, distyryl glutarate, distyryl adipate, distyryl maleate, distyryl fumarate, β, β- Distyryl dimethyl glutarate, distyryl 2-bromoglutarate, distyryl α-dichloroglutarate, distyryl terephthalate, di (ethyl (meth) acrylate) oxalate, di (methylethyl (meth) acrylate) oxalate, di (malonate) Ethyl (meth) acrylate), malonic acid di (methylethyl (meth) acrylate), succinic acid di (ethyl (meth) acrylate), glutaric acid di (ethyl (meth) acrylate), adipic acid di (ethyl (meth) acrylate) ), Maleic acid di Diethyl (meth) acrylate), fumarate (ethyl (meth) acrylate), beta, beta-dimethyl glutaric acid di (ethyl (meth)
Acrylate), 1,4-phenylenebis (oxyethyl (meth) acrylate), 1,4-phenylenebis (oxymethylethyl (meth) acrylate), 1,4
-Bis ((meth) acryloyloxyethoxy) cyclohexane, 1,4-bis ((meth) acryloyloxyethoxycarbamoyl) benzene, 1,4-bis ((meth) acryloyloxymethylethoxycarbamoyl)
Divalent monomers such as benzene, 1,4-bis ((meth) acryloyloxyethoxycarbamoyl) cyclohexane and bis ((meth) acryloyloxyethoxycarbamoylcyclohexyl) methane; cyanuric acid tri (meth) acrylate, 1,1 , 1-trimethylolpropane tri (meth) acrylate, cyanuric acid tri (ethyl (meth) acrylate), 1,1,1-trimethylolpropane tri (ethyl acrylate), cyanuric acid tri (ethyl vinyl ether), 1,1, A condensate of a reaction product of 1-trimethylolpropane and 3 times mol of toluene diisocyanate and hydroxyethyl acrylate,
Trivalent monomers such as a condensate of (para) hydroxystyrene and a reaction product of 1,1,1-trimethylolpropane and 3 times mole of hexane diisocyanate; for example, tetravalent monomers such as pentaerythritol tetraacrylate Monomer;
A hexavalent monomer such as dipentaerythritol hexaacrylate, etc., or a polymerizable compound having a reactive vinyl group at the end of the oligomer or polymer, or a reactive vinyl group attached to the side chain of the oligomer or polymer A polymerizable compound etc. can be mentioned. It is also possible to use two or more of these polymerizable compounds in combination.

The above-mentioned polymerizable compound is exposed to a photosensitive layer 3 to be described later, which is laminated on the hydrophilic layer 2 containing these polymerizable compounds, and is polymerized by exposure to a portion, which is not clear but has a strong mutual bond. It is considered to have a role of producing an action and improving the adhesive force between the hydrophilic layer 2 and the polymerized portion of the photosensitive layer 3. The polymerizable compound in the hydrophilic layer 2 after peeling and removing the unpolymerized portion of the photosensitive layer 3 together with the ink receiving layer is in an unpolymerized state, but there is no particular influence at the time of printing even if it is left as it is. However, preferably, the unpolymerized polymerizable compound in the hydrophilic layer 2 is polymerized and / or crosslinked to form a polymer, so that the polymer interacts with the hydrophilic resin component of the hydrophilic layer 2. Since it can be entangled with, and the solubility in water can be reduced, it becomes possible to make it sparingly water-soluble or water-insoluble as in the case of using a waterproofing agent,
Depending on the degree, it may not be necessary to use the waterproofing agent. That is, the polymerizable compound contained in the hydrophilic layer 2 has a role of improving the adhesive force between the hydrophilic layer 2 and the polymerized portion of the photosensitive layer 3 and at the same time improves the water resistance of the hydrophilic layer 2. It also has a role.

However, when an unpolymerized polymerizable compound is polymerized and / or crosslinked for the purpose of improving the water resistance as described above, the hydrophilic layer 2 contains a polymerization initiator. There is a need. Examples of the photopolymerization initiator used in this case include a carbonyl compound, a sulfur compound, a halogen compound, and a redox photopolymerization initiator.

Examples of the carbonyl compound include diketones such as benzyl, 4,4-dimethoxybenzyl, diacetyl and camphorquinone; benzophenones such as 4,4-diethylaminobenzophenone and 4,4′-dimethoxybenzophenone; Acetophenones such as acetophenone and 4-methoxyacetophenone; for example, benzoin alkyl ethers; thioxanthones such as 2-dichlorothioxanthone, 2,5-diethylthioxanthone, thioxanthone-3-carboxylic acid-β-methoxyethyl ester; Chalcones and styryl ketones having a dialkylamino group;
Examples thereof include coumarins such as 3,3′-carbonylbis (7-methoxycoumarin) and 3,3′-carbonylbis (7-diethylaminocoumarin).

Examples of the sulfur compound include disulfides such as dibenzothiazolyl sulfide and decylphenyl sulfide. Examples of the halogen compound include carbon tetrabromide, quinolinesulfonyl chloride, S-triazines having a trihalomethyl group, and the like. The redox-based photopolymerization initiator is a combination of a trivalent iron ion compound (for example, ferric ammonium citrate) and a peroxide, a photoreducing substance such as riboflavin or methylene blue, and triethanol. Examples include a combination of reducing agents such as amine and ascorbic acid.

It is also possible to obtain a more efficient photopolymerization reaction by combining two or more of the above-mentioned photopolymerization initiators. Examples of combinations of such photopolymerization initiators include chalcones and styrylstyryl ketones having a dialkylamino group, coumarins and S-triazines having a trihalomethyl group, and a combination of camphorquinone. The addition amount of each of the various polymerization initiators as described above is preferably 0.1 to 30 parts by weight, more preferably 0.3 to 25 parts by weight with respect to 100 parts by weight of the polymerizable compound.

Further, as will be described later, when the photosensitive layer 3 is laminated (laminated) on the hydrophilic layer 2, the hydrophilic layer 2 has a smoothness such that it adheres when the photosensitive layer 3 is laminated. Is preferred. Further, the hydrophilic layer 2 may appropriately contain a thermal polymerization inhibitor, a preservative, an antihalation dye, an antifoaming agent, an antistatic agent, a dispersant, an emulsifier, etc., if necessary. When the hydrophilic layer 2 maintains its own strength,
Instead of using the support 1, a film or sheet-like material formed only by the hydrophilic layer 2 may be molded by including the polymerizable compound or the like.

Next, the peelable and developable photosensitive layer 3 constituting the printing original plate used in the present invention will be described. The photosensitive layer 3 includes a hydrophilic layer 2, which is a lower layer of the photosensitive layer 3, and a peeling layer, which is an upper layer of the photosensitive layer 3, in a polymerized portion and an unpolymerized portion generated in an exposed portion and an unexposed portion of the photosensitive layer 3 after image exposure. Using the difference in adhesiveness (adhesiveness) to the ink receiving layer 4 having a property (the peeling support layer 5 when the peeling support layer is separately provided),
A portion where the adhesive force between the photosensitive layer 3 and the upper layer is greater is peeled off together with the ink receiving layer 4 which is the upper layer of the photosensitive layer 3 to thereby remove the adhesive force between the photosensitive layer 3 and the lower layer (hydrophilic layer 2). A recorded image can be formed by leaving a large portion on the hydrophilic layer 2. The portion of the photosensitive layer 3 remaining on the hydrophilic layer 2 is an exposed portion or an unexposed portion depending on the composition of the photosensitive layer and the combination of materials used for the upper and lower layers of the photosensitive layer. In the present invention, it is necessary to select the composition of the photosensitive layer and the combination of the upper layer and the lower layer of the photosensitive layer so that the exposed portion remains on the hydrophilic layer.

The photosensitive layer 3 has at least a polymerizable compound.
Object, a layer-forming polymer substance and a photopolymerization initiator
And the materials listed when forming the hydrophilic layer 2 are used.
It can be widely used. As a layer-forming polymeric substance
Is, for example, the case of forming the hydrophilic layer 2 described above.
In addition to layer-forming polymeric substances, chlorinated polyethylene, salts
Chlorinated polyolefin such as chlorinated polypropylene; Polymer
Chill methacrylate, polyacrylic acid, polymethacrylic
Acid, polyacrylic acid alkyl ester (with alkyl group
, Methyl group, ethyl group, butyl group, etc.), acrylic acid
Alkyl ester (alkyl group is same as above) and acryloni
Trilyl, vinyl chloride, vinylidene chloride, styrene, pig
Copolymer with at least one monomer such as a diene; poly
Copolymerization of vinyl chloride, vinyl chloride and acrylonitrile
Products; polyvinylidene chloride, vinylidene chloride and acryloni
Copolymer of tolyl; polyvinyl acetate, vinyl acetate and chloride
Copolymer of vinyl; polyvinyl alcohol, polyvinyl
Pyrrolidone, polyacrylonitrile, acrylonitrile
And styrene copolymers; acrylonitrile and butadiene
And copolymers with styrene; polyvinyl alkyl ether
(Alkyl groups include methyl, ethyl, and
Ropyl group, butyl group, etc.), polyethylene, polypropylene
, Polybutene, polystyrene, poly-α-methylstyrene
Ren, polyamide (6-nylon, 6,6-nylon,
6,10-nylon, etc.), poly-1,3-butadiene,
Polyisoprene, polyurethane, polyester (polyester
Tylene terephthalate, polyethylene isophthalate,
Linear saturated polyester, etc.), chlorinated rubber, polychloropre
Polyvinyl butyral, polyvinyl formal, su
Tylene-butadiene rubber, poly (chlorosulfonated ethylene
Len) and other homopolymers or copolymers.

Of the above substances, preferred ones are:
Chlorinated polyolefin typified by chlorinated polyethylene and chlorinated polypropylene, polymethylmethacrylate, polyvinyl chloride, vinyl chloride-vinylidene chloride copolymer (vinyl chloride molar content 20 to 80%), vinylidene chloride-acrylonitrile copolymer (Acrylonitrile molar content 10 to 30%), vinyl chloride-acrylonitrile copolymer (Acrylonitrile molar content 10 to 30)
%), Polystyrene, polyvinyl butyral, polyvinyl acetate, polyvinyl formal, vinyl chloride-vinyl acetate copolymer, polychloroprene, polyisoprene, chlorinated rubber and poly (chlorosulfonated ethylene)
Etc., and particularly preferred are chlorinated polyolefins and polyvinyl butyral typified by chlorinated polyethylene and chlorinated polypropylene. These substances may be used alone or as a mixture of two or more kinds.

As the polymerizable compound and the photopolymerization initiator which are the constituents of the photosensitive layer 3, the same materials as the constituents of the hydrophilic layer 2 described above can be used. The amount of initiator is preferably polymerizable compound 1
0.1 parts by weight to 30 parts by weight, more preferably 0.3 parts by weight to 25 parts by weight, based on 100 polymerization parts, a thermal polymerization inhibitor for preventing dark polymerization during storage, and improved plate inspection property. For this purpose, various additives such as a coloring agent and a plasticizer, and an antihalation agent can be contained.

Examples of the thermal polymerization inhibitor used at this time include (para) methoxyphenol, hydroquinone, phenothiazine, pyrogallol, naphthylamine,
β-naphthol, tert-butylcatechol and the like can be used. As the plasticizer, for example, phthalic acid esters such as dicyclohexyl phthalate and dimethyl phthalate, glycol esters such as dimethyl glycol phthalate, and phosphoric acid esters such as triphenyl phosphate can be used. Naturally, the photosensitive layer 3 having the above-described structure needs to form a good image at the time of peeling and development, and at the same time, needs to have sufficient adhesive strength with the hydrophilic layer 2 in the image portion (exposed portion). .

The printing plate precursor used in the present invention is provided with an ink receiving layer 4 having a peeling property on the photosensitive layer 3 as described above, or a peeling supporting layer 5 separately, and further on it. An ink receiving layer is provided. The peeling support layer 5 means a layer serving as a support when the photosensitive layer 3 is peeled off, and the adhesive force between the polymerized portion (exposed portion) of the photosensitive layer 3 and the hydrophilic layer 2 is
At least under the condition that the adhesive strength between the peeling support layer 5 and the hydrophilic layer 2 is weaker than the adhesive strength between the peeling support layer 5 and the unpolymerized portion (unexposed portion) of the photosensitive layer 3. A wide range of materials can be appropriately selected as long as they satisfy the above conditions. Specifically, for example, polyethylene terephthalate, polypropylene, cellulose diacetate,
Cellulose triacetate, cellulose acetate butyrate, cellulose acetate propionate, cellulose acetate, cellophane, methyl cellulose, ethyl cellulose, polymethyl methacrylate, polyvinyl chloride,
Vinyl chloride-vinylidene chloride copolymer, vinyl chloride copolymer such as vinyl chloride-vinyl acetate copolymer, polyvinylidene chloride, polystyrene, polyvinyl alcohol, polycarbonate, gelatin, polyamide (for example, 6-nylon, 6,6- Nylon, 6,10-nylon, etc.) and the like. Furthermore, it is also possible to preferably use a mixture of two or more of these materials, or a laminate. The thickness of the peeling support layer 5 is preferably about 0.5 μm to about 300 μm, and more preferably about 2 μm to about 50 μm.

The ink receiving layer 4 constituting the printing original plate used in the present invention is made of a material used in a conventionally known ink jet image receiving paper and is transparent to the photosensitive wavelength of the photopolymerization initiator of the photosensitive layer 3. Is required. Specifically, as a material for forming the ink receiving layer 4, a hydrophilic polymer material is preferably used. Typical materials include polyvinyl alcohol, polyvinylpyrrolidone, partially saponified polyvinyl acetate, cellulose acetate butyrate, gelatin, and methyl methacrylate-2.
-Hydroxyethyl methacrylate copolymer or the like is used. When such a hydrophilic polymer material is used as a material for forming the ink receiving layer 4, the peeling support layer 5 as described above is used.
Need not be provided separately, and it is possible to provide both functions of peeling support and ink reception by using only the ink receiving layer 4. In addition, the ink receiving layer 4 is made of alumina (pseudo boehmite).
The addition of silica or silica accelerates the ink absorption rate, eliminates bleeding, and enables the formation of clear images.

Printing master plate 1 formed from the above-mentioned materials
0 was used to perform plate making with the plate making apparatus according to the present invention shown in FIG. The plate making apparatus of the present invention comprises means for forming an ink image by activating an ink jet recording head on the ink receiving layer of the printing original plate, means for exposing the printing original plate on which the ink image is formed, and ink. And a means for developing at the same time as peeling off the receptor layer. The process of making a plate with the plate making apparatus having the above structure will be described in detail with reference to FIGS. FIG. 3 is a schematic cross-sectional view showing an example of the plate making apparatus of the present invention, and FIG. 4 shows a flow of the plate making method of the present invention.

In the paper feed cartridge 11 of the paper feed unit 100 ,
When the printing original plate 10 having the configuration described above is put in and a recording start (S2) signal is sent from the controller outside the apparatus exterior 41, the exhaust fan 30, the light source 23, and the heater 2
The power supplies 8 are turned on (S3 to S5). Next, the peeling rollers 32a and 32b and the paper discharge rollers 33a and 33b are driven (S6 to S7). Subsequently, the paper feed roller 12, the transport rollers 13a and 13b, and a drive roller (hereinafter, referred to as a drive roller driven by a stepping motor for transporting recording).
It is called a step drive roller. ) 15a and 15b are driven, and the printing original plate 10 is sent to the inkjet recording unit 200 (S8 to S10).

When the leading edge of the printing original plate 10 is detected by the sensor 19 (S11), the paper feed roller 12, the transport rollers 13a and 13b, and the step drive roller 15a.
And 15b are stopped (S12 to S14). The inkjet recording unit 200 includes step driving rollers 15a and 15b, an inkjet cartridge 16 (BJ10 bubble jet manufactured by Canon), a platen guide 17, and a heater (Sakaguchi Denritsu Silicon Rubber Heater 100).
W) 18, sensor 1 for detecting the leading edge of printing plate 10
9 and 9.

The ink jet cartridge 16 has an ink jet recording head (nozzle) 20 and an ink tank 21 for storing ink. The inkjet recording head 20 corresponds to the inkjet recording head 2 according to an image signal from an external controller.
Ink is ejected onto the surface of the printing original plate 10 from a nozzle provided in 0, and an image serving as a mask for the next exposure is recorded on the ink receiving layer of the printing original plate 10. The inkjet recording head 20 is a serial type head, and recording is sequentially performed while operating the head perpendicularly to the transport direction of the printing original plate 10 for each head width.

Here, the ink filled in the ink tank 21 will be described. In the present invention, any ink that can form an ink image that affects the photosensitivity of the photosensitive layer 3 forming the printing original plate 10 is preferably used. For example, as a component that inhibits, reduces or eliminates the photosensitivity of the photosensitive layer 3, a dye or pigment that absorbs light such as a black dye or a pigment, a metal pigment that reflects light such as a white pigment, or a light that absorbs light such as an ultraviolet absorber. An ink containing the material is included. In addition, an ink appropriately containing a polymerization initiation material that accelerates the polymerization and curing of the photosensitive resin that is a constituent material of the photosensitive layer 3 or a material that inhibits the polymerization and curing such as an alkali or an acid is used.

Ink jet using such an ink
Recording section200To print the desired ink image on the printing plate 10.
After forming,400With ink image
By exposing, only the ink image portion of the photosensitive layer 3 is erased.
Contained in ink, for example, contained in ink
Due to the photosensitivity inhibiting component, cross-linking and curing does not occur
And the other part is crosslinked and cured to become a polymerized part. This result
As a result, the photosensitive layer 3 in the polymerized portion and the hydrophilic layer 2 thereunder
Since the adhesiveness (tackiness) with
This part is not stripped and removed by the
Only the ink image portion, which is the unpolymerized portion of the photosensitive layer 3, is the upper layer.
Ink receiving layer 4 (or peeling supporting layer 5 and ink receiving layer)
As a result of being peeled off together with 4), the hydrophilic layer 2 on the support 1 is removed.
The photopolymerizable layer 3 is formed on the top of the photosensitive layer 3 to form the printing original plate 10.
A usable relief image is formed. Book as above
The ink used in the invention is a conventional inkjet ink.
In contrast to the black ink, the ink has a unique action as described above.
The only difference is that the material to be included is appropriately selected and included.
Others are the same as the conventionally known inkjet ink.
Yes. For example, the ink medium that makes up the ink is water.
And hydrophilic organic solvent mixture, hydrophilic organic solvent, hydrophobic
Any organic solvent or the like can be preferably used.

In the ink jet recording section 200 , the transmission section
An image signal is sent from 300 (S15). Ink is projected from the inkjet recording head 20 in response to this signal, and an ink image is recorded on the printing original plate 10 (S16). The inkjet recording unit 200 that constitutes the recording apparatus of the present invention is a commonly used serial type recording unit, and the inkjet nozzles are arranged side by side in the printing plate transport direction. Further, the inkjet cartridge 16 is moved in the direction perpendicular to the paper surface of FIG. 3 to scan the printing original plate 10. Therefore, when an image signal comes in, the ink jet nozzle causes the printing plate 10 to
When the upper side is scanned and the recording of one line of the width of the inkjet nozzle is completed, the inkjet cartridge 16 returns to the initial position and the recording of one line is completed (S20).

Next, when the completion is confirmed, the step driving rollers 15a and 15b, the conveying rollers 25a and 25b, etc. are driven (S18, S19), and the printing original plate 10 is sent out by the width of one line of the ink jet nozzle. The driving of the step drive rollers 15a and 15b, the transport rollers 25a and 25b, etc. is stopped (S20 to S22). If the image signal is not finished,
The recording (S16 to S22) is repeated. When the image signal ends (S23), the step drive roller 15a
15b and the conveying rollers 25a and 25b are driven (S24, S25) to convey the printing original plate 10 to the exposure unit 400 . The printing original plate 10 on which the ink image is recorded by the inkjet recording unit 200 is conveyed by the conveyance guides 22a and 22a.
2b, transport rollers 25a and 25b, 26a
And 26b and the conveyor belt 27 to convey to the exposure unit 400 . At this time, the printing original plate 10 is transported in the same manner as the inkjet recording unit 200 .

In the exposure section 400 , as described above, the printing original plate 10 on which an image is formed on the ink receiving layer 4 is exposed to light except for the ink image section formed by the ink containing the photosensitivity-inhibiting substance. Polymerize and cure. As the exposure light source 23, a high pressure mercury lamp (500 W) was used.
The mirror 24 of the exposure unit 400 is for efficiently irradiating the printing original plate 10 with the light of the light source 23. Conveyor belt 2
A platen guide / heater 28 is provided inside 7. The heater 28 (100 W rubber heater manufactured by Sakaguchi Denki) is configured by a nickel-chromium wire as a heating element and covered with silicon rubber.
It has the effect of accelerating the polymerization of the printing original plate 10 at 100 ° C.
Set to. It is also a means for assisting the drying of the ink as soon as it is recorded, and is set to about 50 ° C. By this method, the ink on the printing original plate 10 dries quickly, so that the ink is prevented from diffusing, the recording dots are well cut, and a clear image with high resolution can be obtained.

The printing plate 10, after being exposed, peeled portion 5 conveying rollers 25a and 25b, 26a and 26b, the conveying belt 27 and the conveyance guide 31a and 31b
Sent to 00 . The peeling unit 500 includes the peeling roller 32.
a and 32b, discharge rollers 33a and 33b, a scraper 34, and guides 35a and 35b. The surface of the peeling rollers 32a and 32b is coated with an adhesive, which separates the support 1 and the hydrophilic layer 2 of the printing original plate 10 from the ink receiving layer 4, and the polymerized portion of the photosensitive layer 3 is separated. It has a function of separating the unpolymerized portion. The original printing plate 10 is sent to the lower sheet discharge cassette 37 by the sheet discharge roller 33b. The separated ink receiving layer 4 is sent to the upper sheet discharge cassette 36 by the sheet discharge roller 33a.

As described above, the photosensitive layer 3 of the printing original plate 10
Is separated into a polymerized portion and a non-polymerized portion by the peeling rollers 32a and 32b, and a peeling end is provided at the tip thereof so as to facilitate the separation. That is, at the tip of the printing original plate 10,
By providing the region without the photosensitive layer, the printing original plate 10 having the peeled edge can be easily prepared. The printing original plate 10 in which the polymerized portion of the photosensitive layer 3 is formed on the support 1 and the hydrophilic layer 2 is installed in a printing press plate cylinder to perform printing.

The separating plates 42a and 42b in the plate making apparatus are
A threshold that separates the inkjet recording unit 200 and the exposure unit 400, and prevents heat generated in the exposure unit 400 from flowing directly toward the inkjet recording head and drying the ink in the head to cause nozzle clogging. Is.
Further, as shown in FIG. 3, in order to prevent a large amount of heat from flowing into the inkjet recording unit side, it is preferable to provide the exhaust fan 30 on the downstream side of the inkjet recording unit 200 . The ink jet recording method may be a method in which a nozzle is deformed by using a piezoelectric element and the ink is projected by a change in the pressure, or bubbles are generated in the ink by heat (a bubble jet method). It may be a method of projecting from the tip of the nozzle by utilizing volume change.

The ink jet recording head 20 may be a serial type head or a line type head in which nozzles are arranged perpendicularly to the carrying direction. Also, the heater 18 is
A platen roller may be provided with a heater, or a means for blowing air may be provided on the printing original plate 10 immediately after recording. The light source 23 of the exposure unit may be provided according to a conventionally known method and conditions, and examples thereof include an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a medium to low pressure mercury lamp, a xenon lamp, an arc lamp, a metal halide lamp, and a fluorescent lamp. Any of the ultraviolet rays generated from the light source can be used. The irradiation time may be a short time of about several seconds to several minutes.

When the printing original plate 10 is discharged, the sensor 29 detects the end of the printing original plate 10 (S26), so that the transport rollers 13a and 13b are stopped (S27), and the step driving rollers 15a and 15b
After stopping (S28), the heater 28, the light source 23, and the exhaust fan 30 are stopped (S29 to S31), and the apparatus is stopped (S32).

[0045]

[Effects] According to the present invention, there is provided a plate making method which can be used in a small factory or various offices and which can easily and easily make a plate, and a printing plate having high printing durability. To be done. Further, according to the present invention, since the dry development is performed, there are no problems of liquid management and waste liquid treatment as in the case of using the wet development, and the plate making process is simple and the apparatus It is possible to provide an excellent plate making apparatus that is easy to maintain.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a printing original plate used in the present invention.

FIG. 2 is a schematic cross-sectional view showing an example of a printing original plate used in the present invention.

FIG. 3 is a schematic cross-sectional view showing an example of a plate making apparatus of the present invention.

FIG. 4 is a flowchart showing a flow of manufacturing steps of the plate making method of the present invention.

[Explanation of symbols]

1: Support 2: Hydrophilic layer 3: Photosensitive layer 4: Ink receiving layer 5: Peeling support layer 10: Printing plate 11: Paper feeding cartridge 12: Paper feeding roller 13a and 13b: Conveying roller 14: Conveying guide 15a and 15b : Step driving roller 16: Inkjet cartridge 17: Guide 18: Heater 19: Sensor 20: Inkjet recording head 21: Ink tank 22a and 22b: Guide 23: Light source 24: Mirror 25a and 25b: Conveying roller 26a and 26b: Conveying roller 27: Conveying belt 28: Heater 29: Sensor 30: Exhaust fan 31a and 31b: Conveying guide 32a and 32b: Peeling roller 33a and 33b: Paper discharging roller 34: Scraper 35a and 35b: Guide 36: Paper discharging cassette 37: Discharging Cassette 41: outer 42a and 42b: the separation plate 100: paper feed unit 200: ink jet recording unit 300: electrical transmission unit 400: an exposure unit 500: Peeling unit

Claims (5)

[Claims] 1. An ink provided on a photosensitive resin layer of a printing original plate, using a printing original plate comprising at least a hydrophilic layer, a peelable and developable photosensitive resin layer and a releasable ink receiving layer. A step of forming an ink image on the receiving layer by activating an inkjet recording head by an electric signal corresponding to the image signal to eject ink to form an ink image that affects the photosensitivity of the photosensitive resin layer, and the ink image is formed. And a step of exposing the printing original plate to light and developing the ink receiving layer at the same time. 2. At least one substance selected from the group consisting of black dyes, black pigments, white pigments, ultraviolet absorbers, polymerization initiators that accelerate polymerization and curing, and polymerization inhibitors that inhibit polymerization and curing is contained. The plate making method according to claim 1, wherein an ink is used. 3. A means for forming an ink image by activating an inkjet recording head on the ink receiving layer of the printing original plate, a means for exposing the printing original plate on which the ink image is formed, and an ink receiving layer. And a means for performing development at the same time as peeling. 4. The plate making according to claim 3, wherein the means for activating the ink jet recording head to form an ink image and the means for exposing the printing original plate are provided at positions divided by the separating plate. apparatus. 5. The plate making apparatus according to claim 3, wherein an exhaust fan for maintaining the temperature inside the apparatus is provided on the downstream side of the apparatus provided with the ink jet recording means.