JPH04172351A - Formation of printing plate - Google Patents

Abstract

PURPOSE:To ensure easy operation by exposing an image pattern to an image formation material having a sensitive layer laid on a base material, and transferring an unexposed section onto a pebbled aluminum plate for exposure to active light. CONSTITUTION:An image formation material having a sensitive layer laid on a base material is used for forming a printing plate. Image patter exposure is applied to the aforesaid image formation material, and an unexposed section is transferred to a pebbled aluminum plate. Furthermore, active light is applied thereto for exposure, thereby forming a printing plate. In this case, a suitable exposure light source may be used for the image pattern exposure of the image formation material, depending on the type of a photosensitive compound. For example, suitable original images are superposed and a high pressure mercury lamp is used for the exposure thereof. Also, pressurized transfer of the unexposed section of the image formation material. For example, the surface of the image and the pebbled aluminum plate are kept in close contact with each other and subjected to pressure for image transfer. According to the aforesaid constitution, development by means of liquid developer is not required, thereby ensuring easy operation.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a printing plate forming method.The present invention provides a printing plate forming method that does not require development with a liquid developer and can be easily carried out.

[Background of the invention] In a conventional printing plate forming process, for example, a plate making process in conventional planographic printing, a photosensitive planographic printing plate (hereinafter sometimes referred to as a PS plate) is subjected to imagewise exposure, followed by development (usually liquid development). The process of developing the printing plate with liquid), rinsing with water, and drying is necessary, and the process up to the production of the printing plate takes time, making the operation complicated. For this reason, there is a desire to develop a technique for creating printing plates more easily. [Purpose of the invention]

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a printing plate forming method that is easy to operate, and in particular, it is an object of the present invention to provide a printing plate forming method that does not require development with a liquid developer and can therefore be easily performed. The present invention aims to provide a printing plate forming method.

[Structure and operation of the invention]

The above object of the present invention is to imagewise expose an image forming material having a photosensitive layer on a support, transfer the unexposed area onto a grained aluminum plate, and expose it to actinic light to form a printing plate. This is achieved by a printing plate forming method. According to the above configuration, as will be specifically explained later, a printing plate can be formed without using a liquid developer, and without using a complicated and time-consuming process, especially during development. A printing plate can be easily formed without the need for accompanying. The present invention will be explained in more detail below. The printing plate forming method of the present invention uses an image forming material having a photosensitive layer provided on a support (hereinafter, this may be appropriately referred to as "image forming material of the present invention"). The support for constructing the imaging material of the invention may be made of any material, for example preferably polyethylene terephthalate. It is preferable to form a back coat layer on the opposite side of the support from the photosensitive layer. The back coat layer can be formed of silicone resin or the like. The photosensitive layer of the image forming material of the present invention may be any colored layer (for example, a colored layer) as long as it is imparted with photosensitivity (for example, made photopolymerizable by containing a photopolymerizable compound). It is preferable from the point of view of handling convenience that the material be colored with a coloring agent or the like, but it is not necessarily colored. The photosensitive layer preferably has adhesive properties. The photosensitive layer preferably has the above-mentioned properties by appropriately using a photopolymerizable compound, an organic polymer binder, a photopolymerization initiator, a thermal polymerization inhibitor, a coloring agent (for example, a dye or a pigment), etc. It can be configured as The photosensitive layer may be composed of a single layer or a stack of two or more layers. For example, it may consist of two layers: a photosensitive layer containing a photopolymerizable compound and a colored layer containing a coloring agent. When composed of two or more layers, any layer may be formed on the side of the support. Preferred compositions for forming the photosensitive layer include monomers,
It consists of a photopolymerizable compound of an oligomer and/or a prepolymer; an organic polymer bonding side that is not photopolymerizable if necessary; a photopolymerization initiator activated by actinic rays; a coloring agent such as a pigment and/or dye; It is also good to contain a thermal polymerization inhibitor if necessary. Preferred photopolymerizable compounds include, for example, (meth)acrylic acid, methyl (meth)acrylate, butyl (meth)acrylate, cyclohexyl (meth)acrylate, dimethylaminoethyl (meth)acrylate, benzyl (meth)acrylate, calpitol ( meth)acrylate, 2-ethylhexyl(meth)acrylate, lauryl(meth)acrylate, 2-hydroxyethyl(
meth)acrylate, 2-hydroxypropyl(meth)
Acrylate, glycidyl (meth)acrylate, (meth)acrylamide, N-methylol (meth)acrylamide, styrene, acrylonitrile, N-vinylpyrrolidone, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol di(meth) ) acrylate, polypropylene glycol di(meth)acrylate, butylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, 1
．． 4-butanediol diacrylate, 1,6-hexanethiol di(meth)acrylate, pentaerythritol diacrylate, pentaerythritol triacrylate, trimethylolpropane triacrylate, dipentaerythritol hexaacrylate, alkylene oxide adduct of phenol ( Examples include low molecular weight photopolymerizable compounds such as meth)acrylates. In addition, epoxy acrylate, urethane acrylate,
polyester acrylate, alkyd acrylate,
Examples include high molecular weight photopolymerizable compounds such as acrylate modified products of petroleum resins and unsaturated polyesters. The photopolymerizable compounds may be used alone or in a mixture of two or more. Preferred organic polymer binders include 1. Examples include thermoplastic, non-photopolymerizable polymers that have excellent compatibility with photopolymerizable compounds. For example, polyvinyl chloride, poly(meth)acrylic acid, poly(meth)acrylic acid ester, polyvinyl ethyl, polyvinyl acetal,
Urethane resin, epoxy resin, polyamide, diacryl phthalate resin, etc. can be used. Preferred photopolymerization initiators include those with low absorption in the visible light region, such as benzophenone, 4,4-bis(diethylamino)benzophenone, 4-bis(diethylamino)benzophenone,
-Methoxy-4-dimethylaminobenzophenone, 2-
Ethyl anthraquinone, fechinthraquinone, benzoin, benzoin methyl ether, and preferred thermal polymerization inhibitors include p-methoxyphenol, hydroquinone, t-butylcatechol, pyrogallol, pyridine, and arylphosphite. The thickness of the photosensitive layer is not particularly limited, and may be, for example, about 0.5 μm. The appropriate amount to apply varies depending on the colorant (dye or pigment) contained, but for example, 0.5g/rrT~3
0g/rrr is appropriate. For coating, a bar coater or the like may be used, and a spin coater or a 1[(U) coater may also be used, which is optional. When forming a colored layer separate from the photosensitive layer, dye and /
Alternatively, it can be used by appropriately selecting from paints, printing inks, etc. that contain pigments and do not normally have photopolymerizability. For example, thermoplastic resins, dyes and/or pigments, solvents,
It is sufficient to use a material containing other additives that can be transferred according to the image along with the transfer of the photosensitive layer. It is preferable to form a cover sheet on the upper layer of the photosensitive layer (on the side opposite to the support). Materials for the cover sheet include, but are not limited to, polyethylene film, polyethylene terephthalate film, and acetate film. In a preferred embodiment, the photosensitive layer can be colored using a colorant, and various dyes and pigments can be used as the colorant. In the present invention, pigments of a tone corresponding to various colors for use in printing plates, for example 1, yellow, magenta, cyan, black,
Dyes, blue, green, and red pigments and dyes can be used. Other metals, white pigments, fluorescent pigments, etc. can also be used. Below are some examples of the various pigments and dyes that can be used in the present invention. These are organic pigments or dyes such as azo-based, phthalocyanine-based, quinacridone-based, anthraquinone-based, indigo-based, and methine-based pigments, or inorganic pigments, and some specific examples of these are described below. (C,1, means color index). Lemon Chrome Yellow M35 (C, 1,77603
) Medium Chrome Yellow (C, 1,77600)
Molybdate Orange (C, 1,77605) Milori Blue 671 (C, 1,77510)
Seicalite Blue (C, 1,74200) Seicalite Rose (C, 1,45160:1
) Seicalite Magenta (C, 1,45170
:2) Seiki Light Blue (C, 1,4259
5:2) Seicalite Violet B800 (C, 1,42535:2) Seika First Lake Red CZ A665 (C, 1
, 15585:1) Seika Fast Red LR116 (C, 1, 15630: 1) Seika Fast Carmine 6B148B (C, 1, 15
850:1) Seiriki First Red 8040 (C,1,15865:1) Seiriki First Yellow 10GH (C,1,11710) Seika First Yellow GH (C,1,11680) Seika First Yellow 2015 (C,1, 11741) Seika First Yellow A-3 (C, 1, 11737) Seika First Yellow 2300 (c, ■, 21090) Seiriki First Yellow 2200 (C, 1, 21095) Seiriki First Yellow 2400 (C, 1, 21105) Seiriki First Yellow 2600 (C01,21100) Seiriki First Yellow 2500 (C,1,21096) Seika First Yellow 2720 (C,1,21108) Seika First Orange 2900 (C91,21160) Seika First Orange 900 (C,1 , 21110) Seiriki First Orange 3044 (C, 1, 12075) Seiriki First Red 930 (B) (C, 1, 21120) Seiriki First Scarlet G conc (C, 1,
12315) Seika First Carmine 3840 (C, 1, 12490) Seiriki First Carmine 3870 (c, ■, 12485) Seika Fast Carmine RK-1 (C, 1, 12317) Seika First Hiolenoto FR (C, 1, 12322 ) Chromofine Blue 4920 (C, 174160
) Chromofine Green 2GO (C,'I, 74260) Chromofine Yellow 5910 (C, 1, 2003
5) Chromofine Orange 6726 (C, 1, not 1isted,) Chromofine Blue Lett 6750 (C, L not 1isted,) Chromofine Red 6820 (C, 1, 4650
0) Chromofine Violet (C, 1,51319
) Shimla First Yellow 8GTF (C, 1, 21105) Shimla First Yellow 4186 (C, 1, 11767) Shimla Fast Yellow 4193G (C, 1, 21) manufactured by Dainichiseika Chemical Co., Ltd.
100) Shimla Fast Yellow GHK-N4 (C, 1, 2
1090) Shimla Fast Yellow GTF230T (C, 1,
not 1isted, ) Shimla First Yellow RF (C,1,21096) Shimla First Yellow 4181 (C,1,21108) First Gen Super Yellow GRO (C,1,56
280) Shimla Fast Virazolone Orange G (c, ■,
21110) Shimla First Orange (C, 1, 21160) Shimla First Orange 4183H (C, 1, 11
780) Shimla Lake Red Cconc 130 (C, 1, 1
5585:1) Shimla Neotall Red 2BY (C,1,15565:1) Shimla Red 2BS (C,1,15865:I) First Gen Super Red 2Y (C,1,73905) First Gen Super Red 7083 Y (C ,1,
46500) Shimlare Ndo 3013 (C, 1,1586
5:2) Shimla Brilliant Carmine 6B246 (C
, 1,15850:1) First Gen Super Magenta R (C, 1,73915) First Gen Super Violet RNS (C, 1,
51319) First Gen Super Blue 6016 (C, [698
00) First Gen Blue BSF-A (C, 1,74160) First Gen Blue TGR-L (C, 1,74160) First Gen Green S (C, 1,74260)
First Gen Green 2YK (C, 1,74265) Oriental Yellow C, T (C, 1,11680) manufactured by Dainippon Ink ■
) Victoria Pure Blue (C01,42595)
Lionor Red 7 B4401 (C, 1,158
30) Lionor Red 3901 (C, 1,
12120) Lionor Red F B5500 (C
,1,12490) Lionor Red F B K
(C, 1, 12490) Nl17100 Lionol Yellow - (C, I, 21096) Lionol Yellow F
CG-3 (C, 1, 21127) Lionor Yellow NBR (C, 1, 21108) Lionor Yellow-1806-G (C, 1, 21127)
Lionor Red 28K (C, 1,15865:
4) Lionol Yellow K-50 (C, 1,1396
0) Lionol Yellow K-2R (C, 1,1395
5) Lionol Yellow FCG-3 (C, 1,21127) Lionol Blue 7210-V (C, 1,7416
0) Lionor Blue SM (C, 1,741
60) Lionor Blue FG-7330 (C, 1,
74160) Lionor Blue SP G-8 (C,
1,74160) Lionor Blue E S P -S
(C, 1,74160) Lionor Blue E S
(C, 1,74160) Lionor Green B-20
1 (C, 1,74260) Lionol Green Y-10
1 (C, 174260) Lionor Green 6Y-50
1 (C01,74160) Lionogen Yellow GF (C,1,70600
) Lionogen Yellow 3G-F (C, 1, not 1isted,) Lionogen Yellow RX -F (C, ■, 66280
) Lionogen Orange R-F (C,1,11780
) Lionogen Orange G R-F (C, 1,7110
5) Lionogen Brown R-F (C, 112510
) Lionogen Red Y-F (C, 1,4650
0) Lionogen Red 6 B -F (C,1,46
500) Lionogen Red G D -F (c, r
, 53900) Lionogen Magenta R-F (C,1
,73915) Lionogen Violet RL-F (C,1,51319) Lionogen Blue RF (C,1,69800)
Lionogen Blue R3-F (c, ■, 69800)
Auramine manufactured by Toyo Ink (C11,41000)
Carotene brilliant flavin (C, 1, basic 13) Rhodamine 6 G CP (C, 1,451
60) Rhodamine B (C,1,45
170) Safranin OK 70:100 (C,
1,50240) Erioglaucine X (C,
1,42080) First Black HB (C
, 1,26150) Benzidine Yellow 4T-564D (C, 1,21095) Mitsubishi Carbon Black M A-100 Mitsubishi Carbon Black #30. #40. #50 In carrying out the present invention, when the photosensitive layer contains a colorant,
The content of the colorant in the layer can be determined as appropriate depending on desired performance. For example, the content of the colorant is 5~
It is preferably in the range of 40% by weight, particularly preferably in the range of 10 to 30% by weight. In the practice of the present invention, when using a coloring agent, two or more kinds of pigments and dyes can be used as a mixture. a support for forming an image forming material by providing a photosensitive layer;
The support for constructing the imaging material, eg, provided with a colored photopolymerizable adhesive, may be of any material, although transparent supports are generally used when back exposure is required. As the support, a polyester film, especially a polyethylene terephthalate film, especially a two-wheel stretched polyethylene terephthalate film is preferable from the viewpoint of dimensional stability against water and heat. In addition, acetate film, polyvinyl chloride film, polystyrene film,
Polypropylene films may also be preferably used. In the image forming material of the present invention, it is preferable that a heat-softening release layer is provided on the surface of the support. Here, the heat-softening release layer is a general term for a layer that functions as a heat-softening layer and/or a layer that functions as a release layer, and is used when a colored image formed on a support is transferred to a transfer material. This is a general term for those provided so that the colored image can be easily peeled off from the support. For example, a layer that facilitates the peeling by being softened by heat (referred to as a heat-softened layer), or a layer formed by mold release treatment of the surface of the support with a deformable substance (referred to as a mold release treatment layer) ), etc. For example, when carrying out the present invention, a release layer is provided on the support by a heat-softening layer (it is preferable that a release treatment layer is further formed thereon), and a colored photosensitive layer is formed on this. structure can be taken. Such a heat softening layer can be made of, for example, vinyl acetate-ethylene copolymer. The release treatment layer is made of, for example, silicone resin, fluororesin,
Polyethylene, polypropylene ethylene-α-olefin copolymer, propylene-α-olefin copolymer, ethylene-propylene copolymer, ethylene-propylene-
It can be formed from diene copolymer, ethylene-acrylic acid copolymer, ethylene-vinyl acetate copolymer, ionomer resin, wax, polyamide resin such as nylon, copolymerized nylon, and the like. Furthermore, silicone resin or fluororesin may be added to melamine resin or polyacrylate urethane resin. In addition, polypropylene film, polyethylene film, etc. exhibit good mold release properties without special mold release treatment, so in a preferred embodiment, the film is thinner than the thickness of the support.
A polypropylene layer or a polyethylene layer can be provided as a release layer. The method for forming a polypropylene layer or polyethylene layer on a support is as follows: (1) A solution of polyvinyl acetate, polyvinyl chloride, epoxy resin, polyurethane resin, natural rubber, synthetic rubber, etc. dissolved in an organic solvent is used as an adhesive. After applying these adhesives on a support and drying with hot air or heating, a polypropylene film or a polyethylene film is overlaid and laminated by pressing under heat.
So-called dry lamination method; (2) Using a copolymer of ethylene and vinyl acetate, a copolymer of ethylene and acrylic ester, polyamide resin, petroleum resin, rosin, wax, or a mixture thereof as an adhesive, these adhesives After applying the material onto a support by a doctor blade method, roll coating method, gravure method, reverse roll method, etc. while keeping it in a molten state by heating it as it is,
The so-called hot-melt lamination method, in which polypropylene or polyethylene films are immediately laminated together and laminated by heating at a high temperature if necessary and then cooling; (3) The polypropylene or polyethylene is kept in a molten state and then extruded. This is the so-called extrusion lamination method, in which the film is extruded into a film, and while it is still in a molten state, a support is bonded and laminated. Examples include a so-called coextrusion method in which a polypropylene layer or a polyethylene layer is formed on a support film by multiple moldings using polypropylene or polyethylene in a molten state. The thickness of the release treatment layer is suitably in the range of 0.01 to 30 μm, particularly preferably in the range of 0.1 to 5 μm. The thermosoftening layer has a property of softening at the temperature during thermal transfer, and can be formed from a thermoplastic resin. The thermoplastic resin preferably has a softening point of 130°C to 150°C. The softening point temperature referred to here is VI CA
T is the softening point or the value shown by the ring and ball method. In the present invention,
Specifically, the following can be mentioned as preferred resins. Polyolefins such as polyethylene and polypropylene. Ethylene copolymers such as ethylene and vinyl acetate, ethylene and acrylic ester, and ethylene and acrylic acid. PVC. Vinyl chloride copolymers such as vinyl chloride and vinyl acetate. Polyvinylidene chloride. Vinylidene chloride copolymer. polystyrene. Styrene copolymers such as styrene and maleic anhydride. Polyacrylic acid ester. Polyester resin. Polyurethane resin. Acrylic ester copolymers such as acrylic ester and vinyl acetate. Polymethacrylic acid ester. Methacrylate ester copolymers such as methyl methacrylate and vinyl acetate, and methyl methacrylate and acrylic acid. Polyvinyl acetate. Vinyl acetate copolymer. Vinyl butyral resin. Polyamide resins such as nylon, copolymerized nylon, and N-alkoxymethylated nylon. synthetic rubber. Petroleum resin. Chlorinated rubber. Polyethylene glycol. Polyvinyl alcohol hydrozine phthalate. cellulose derivative, cellulose acetate phthalate,
Cellulose acetate succinate. Schlatsk. wax. The heat-softening layer can be provided on the support using a known method. The thickness of the heat softening layer is preferably in the range of 1 to 50 μm, particularly preferably in the range of 5 to 30 μm. The above-mentioned release treatment layer can also be provided on the heat softening layer,
This method includes a method in which a solution or an emulsion obtained by dissolving the resin for forming the release treatment layer in an organic solvent is applied onto the heat-softening layer, and a method in which a polypropylene film,
Alternatively, a method of laminating a polyethylene film on a heat-softening layer can be mentioned. In the printing plate forming method of the present invention, the image forming material of the present invention is imagewise exposed, the unexposed areas are transferred onto a grained aluminum plate, and exposed to actinic light to form a printing plate. Image-wise exposure of the image-forming material may be carried out using an appropriate exposure light source depending on the type of photosensitive compound (photopolymerizable compound). The exposure can be performed using a mercury lamp. Transfer of the unexposed area (image area) of the image forming material may be performed using pressure transfer, thermal transfer, etc., as appropriate. For example, the image surface is brought into close contact with a grained aluminum plate, and the transfer is performed by applying pressure. You can do it like this. - After the transfer, the aluminum plate is exposed again to actinic light, and this exposure can be performed in the same manner as the exposure of the image forming material described above. This exposure can make the reproduced image stronger. As described above, according to the present invention, there is no need for development using a developer, and therefore a printing plate can be obtained through a simple and easy process. The aluminum plate used as a support for the printing plate may be of any grained type. After degreasing the surface of the aluminum plate (including the alumina laminate, the same shall apply hereinafter) used in the present invention, graining is performed using a brush polishing method, a ball polishing method, a chemical polishing method, an electrolytic etching method, etc., and preferably, It is grained using an electrolytic etching method that produces deep and uniform grains. The anodizing treatment is carried out in an aqueous solution of an inorganic salt such as phosphoric acid, chromic acid, boric acid, or sulfuric acid, or an organic acid such as oxalic acid, or a mixture of two or more of these acids, preferably in an aqueous sulfuric acid solution. This is done by passing an electric current through an aluminum plate as an anode. The amount of anodic oxide film is 5 to 60 ■/drr
f is preferable, and more preferably 5 to 30 .mu./dpo. When carrying out the pore sealing treatment in carrying out the present invention, preferably a sodium silicate aqueous solution with a concentration of 0.1 to 3% is added at a temperature of 8.
This treatment is carried out by immersion at 0°C to 95°C for 10 seconds to 2 minutes. More preferably, it is then added to water at 40 to 95°C.
Process by immersing for 0 seconds to 2 minutes. For example, a method of graining the surface of an aluminum plate and then treating it with silicate (US Pat. No. 2.714,0
No. 66), a method of treatment with organic acid salts (U.S. Pat. No. 2,7
14,066), treatment with phosphonic acids and their derivatives (U.S. Pat. No. 3,220,832), treatment with potassium hexafluorozirconate (U.S. Pat. No. 2,946,683), anodes. Methods of oxidation and treatment with an aqueous solution of alkali metal silicate after anodization (US Pat. No. 3,181,461) can also be used.

【Example】

Examples of the present invention will be described below along with comparative examples. However, it goes without saying that the present invention is not limited to the examples described below. Example 1 In this example, a printing plate was formed as shown below. First, a colored photosensitive layer dispersion was prepared according to the following formulation. That is, 3 of polyester (Byron 300, manufactured by Toyobo)
A 0% methyl ethyl ketone solution was prepared and dissolved by shaking for 48 hours to obtain a polymer solution. Using this polymer solution, a photosensitive solution having the following composition was prepared. Photosensitive polymer solution 400g tetraethylene glycol diacrylate (1-4EC1 manufactured by Shin-Nakamura Chemical) 6g trimethylolpropane triacrylate (ATMPT, manufactured by Shin-Nakamura Chemical) 18g 2-hydroxy-2-methyl-propiophenone (Darocur 1173, Merck & Co., Ltd.) 4.3 g of cyan pigment was added to this photosensitive solution, and shaking with a red devil was repeated five times using the following composition to mix the pigment into the photosensitive solution to prepare a photosensitive layer solution. Saratomo I Sanbujo photosensitive liquid 136g Lionol Blue FG7330 (manufactured by Toyo Ink Co., Ltd.) 6.5g Separately, the support shown below was prepared. Ethylene-vinyl acetate copolymer (trade name: Evaflex, manufactured by DuPont Mitsui Chemicals) was coated on a polyethylene terephthalate film by an extrusion lamination method.
The coating was applied to a thickness of 0 μm to prepare a support having a heat-softened layer. The photosensitive layer solution obtained above was applied onto the support having the heat-softened layer obtained above to a dry film thickness of 3 μm, and then heated under an infrared lamp (3 kW) for 30 minutes.
It was dried by irradiation for 0 seconds. A polyethylene film was laminated on the dried photosensitive layer to prepare an image forming material. On the other hand, an aluminum plate as a transfer material was grained as follows. A 0.24 m thick aluminum plate (material 1050, tempered H16) was degreased in a 5% by weight aqueous sodium hydroxide solution at 60°C for 1 minute, and then degreased in a 0.5 molar hydrochloric acid aqueous solution of 11 J torr. At, temperature: 25°C
1. Electrolytic etching was performed at a current density of 60 A/d and a processing time of 30 seconds. Then, after desmutting in a 5% by weight aqueous sodium hydroxide solution at 60°C for 110 seconds, desmutting was performed in a 20% by weight sulfuric acid aqueous solution at a temperature of 20°C.
Anodization treatment was performed under the conditions of °C1 current density: 3A/drrf and treatment time: 1 minute. Furthermore, a hot water sealing treatment was performed for 20 seconds with hot water at 30° C. to produce an aluminum plate as a support for a lithographic printing plate material. A mesh positive film was superimposed on the polyethylene terephthalate film surface of the image forming material obtained earlier, and 1.
Image exposure was performed for 20 seconds using a 5 kW ultra-high pressure mercury lamp (manufactured by Kamo Denken) to form an image. Next, the polyethylene film of the image sheet was peeled off, and the image surface was closely attached to a grained aluminum plate.
Transfer was performed under pressure conditions of g/c-J, and the support was peeled off. Peeling was carried out easily, and only the image area was transferred onto the aluminum plate. Furthermore, the reproduced image transferred onto the aluminum plate was exposed again using a high-pressure mercury lamp to make the reproduced image stronger. When the aluminum plate with the image obtained here was used as a printing plate and printing was performed under the following printing conditions, a printed matter equivalent to that obtained with a positive PS plate was obtained, and the stiffness was 300,000 sheets. Ta. Printing conditions: Printing machine: Heidel GTO Paper: High quality paper Ink: Toyo Prite Red (manufactured by Toyo Ink Co., Ltd.) Dampening water: 50 times diluted solution of "'5EU-1" (manufactured by Konica Corporation) Printing speed: 5000 sheets/hour Comparative Example-1 The following photosensitive liquid was coated on the previously prepared aluminum plate using an extrusion coater, and primary drying was performed under the conditions of temperature: 100°C, air flow: 10rrr/sin, and processing time: 2 minutes, and further , temperature = 50°C1 humidity = 3%,
A photosensitive lithographic printing plate was prepared by heat treatment under conditions of treatment time = 24 hours. Condensation compound of naphthoquinone (1,2)-diazide (2)-5-sulfonyl chloride and pyrogallol acetone resin (weight average molecular weight (Mw) = 1.800, number average molecular weight (Mn) = 1,100) <Molar condensation rate of OH group = 33 mol%> 2 parts by weight phenol/m-cresol/p-cresol [composition ratio (weight ratio) = 4:3.6:2.43] Formalin novolac resin (Mw = 11, 000, Mn=6.800)
7 parts by weight 2-trichloromethyl-[β(2'-benzofuryl)vinyl)-1,3゜4-oxadiazole 0.06 parts by weight naphthoquinone (1,2)-diazide (2)-5-sulfonyl chloride p-octylphenol formalin novolak resin (MW = 2.000, M n = 1
．． Condensation compound of 400) <Molar condensation rate of OH group = 50 mol%> 0.11 parts by weight Victoria Pure Blue BOH (manufactured by Odugaya Chemical Co., Ltd.) 0.08 parts by weight Methyl cellosolve/Ethyl cellosolve = 4/6 53 parts by weight Using the photosensitive lithographic printing plate thus obtained and a halftone positive film, the operation was evaluated under the following exposure conditions, plate making conditions, and printing conditions. Exposure conditions: Exposure machine: Metal halide lamp “Idol Fin 200”
0” (manufactured by Iwasaki Electric) 8 mW/rd Time: 92 seconds Development conditions: Developer: 6 times diluted solution of Konica PS plate developer “5DR-1” (manufactured by Konica) Gum solution: 5GW-1” (manufactured by Konica) (manufactured by) Development temperature: 25
°C Development time: 45 seconds Printing conditions: Printing machine: Heidel GTO GIO: High quality paper Ink: Toyo Prite Beni (manufactured by Toyo Ink Co., Ltd.) Dampening water:
50 times diluted solution of “5EU-1” (manufactured by Konica) Printing speed: 500 sheets/hour The printed matter obtained by this method showed image reproducibility equivalent to that of the example, but the development process was complicated; The stiffness resistance was also 210,000 sheets, which was inferior to the examples.

【Effect of the invention】

As described above, the printing plate forming method of the present invention has the advantage of being easy to operate, and in particular does not require development with a liquid developer, and therefore can be easily implemented.

Claims (1)

[Claims] [Claim 1] Printing in which an image forming material having a photosensitive layer provided on a support is imagewise exposed, the unexposed areas are transferred onto a grained aluminum plate, and exposed to actinic light to form a printing plate. Plate forming method.