JP2005088407A - Manufacturing method of original plate for lithography and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an original plate for lithography and a printing method which enable attainment a stable printed matter free of a coating defect, without any trouble in manufacture. <P>SOLUTION: The original plate for lithography is manufactured by the method wherein a hydrophilic layer having particulates and an image forming layer are provided sequentially by coating on a plastic film support conveyed continuously. In the case that the conveying speed of the plastic film support is set at V1(m/min) and that of a conveying roll coming into surface touch with a coat after application and drying is set at V2(m/min) and when the coefficient of dynamic friction of the conveying roll and the coat is set at P and the tension for a base width cm on the occasion of the coat coming into surface touch with the conveying roll coming thereinto is set at T(g/cm), in this manufacturing method, at least one of the hydrophilic layers and at least one of the image forming layers satisfy the relation formula: 0.005V1<V2<2V1, 0.10<P<0.95 and 5<T<1,500. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for producing an original plate for lithographic printing, and more specifically, lithographic printing capable of image recording based on a digital signal and capable of obtaining a stable printed matter without any manufacturing troubles. The present invention relates to an original plate manufacturing method and a printing method.

  In the conventional printing process, a negative or positive film is produced from an original image, and the image is exposed to a lithographic printing plate material (lithographic printing original plate) having a photosensitive layer on an aluminum grain support through the film, and an alkaline development is performed. A lithographic printing plate is produced by developing with a liquid, and this is carried out by a procedure of attaching it to a printing machine and printing.

  In recent years, with the spread of computers, computer-to-plate (CTP) technology that draws original image data directly on a printing plate without using a film is becoming widespread, reducing the time and cost required for film production. Is becoming possible. Also, as a need for printed materials, there is a tendency for a small number of various types of products to print various kinds of high-quality images with the number of printed sheets of about several thousand to 10,000 sheets. For this reason, plate making using heat mode laser recording, which has a short drawing time and high resolution, is becoming the mainstream of CTP.

  Synchronizing with the spread of CTP, the printing environment has become an office, and lithographic printing plate materials that do not require an alkaline developer and that do not require any development treatment from the viewpoint of environmental suitability have been desired. It was.

  For example, a lithographic printing plate containing thermoplastic particles dispersed in a hydrophilic binder is attached to a printing machine, and developed on the printing machine to produce a lithographic printing plate (for example, a patent document) 1-3.) According to these techniques, it is possible to produce a printing plate without performing alkali development and without requiring a developing machine, and it is possible to provide a lithographic printing plate that does not require development processing in a pseudo manner.

  In the lithographic printing original plate, it is described that a plastic film can be used as a support in recent years without using a hydrophilic aluminum substrate as a support. Plastic film has lower thermal conductivity than metal, and can be efficiently used for image formation without diffusing heat generated in the heat-sensitive layer by laser exposure during image formation to the support. It has the advantage of being inexpensive compared to the body.

  Examples of the use of a support having a corona-treated surface as a printing plate using these plastic films as a support are mentioned (for example, see Patent Document 4), and a plasma-treated support is disclosed (for example, (See Patent Document 5).

  Various apparatuses are known as a coating apparatus. For example, dip coating, roller coating, fountain coating, air knife, blade coating, bar coating, slide hopper, etc.

  In the production of an original for lithographic printing using the coating apparatus, the transport speed of the plastic film support, the transport speed of the transport roll that touches the coating film after coating and drying, the transport roll that touches the coating film after coating and drying, and There has been no description of a method for producing a stable lithographic printing plate and a stable lithographic printing plate having a stable coefficient of friction with a coating film.

The removal of unnecessary substances on the lithographic printing plate without damaging the surface of the lithographic printing plate is described (see, for example, Patent Document 6), but is a lithographic printing plate using a plastic film support and a lithographic printing plate for production. It does not describe the stability of the surface.
JP-A-9-123387 JP-A-9-123388 JP-A-9-131850 JP-A-9-314794 JP 11-245530 A JP-A-10-161322 (Example)

  An object of the present invention is to provide a method and a printing method for a lithographic printing plate precursor capable of recording an image based on a digital signal, and capable of obtaining a stable printed matter without any manufacturing troubles. is there.

The above object of the present invention can be achieved by the following configuration.
(Claim 1)
In a method for producing a lithographic printing original plate in which a hydrophilic layer having particles and an image forming layer are sequentially provided on a plastic film support that is continuously conveyed, the conveyance speed of the plastic film support is V1 (m / Min), the conveyance speed of the conveyance roll that touches the coating film after coating and drying is V2 (m / min), the dynamic friction coefficient between the conveyance roll and the coating film is P, and the coating film is on the conveyance roll that touches the surface. Lithographic printing, characterized in that at least one layer of the hydrophilic layer and at least one layer of the image forming layer satisfy the following relational expression when T (g / cm) is applied to the base width cm when touching A method for producing an original plate.

0.005V1 <V2 <2V1
0.10 <P <0.95
5 <T <1500
(Claim 2)
A printing method comprising: printing a lithographic printing plate precursor obtained by the production method according to claim 1 after performing laser exposure based on image information, performing on-machine development, and printing.

  According to the present invention, it is possible to provide a lithographic printing plate manufacturing method and a printing method capable of recording an image based on a digital signal and capable of obtaining a stable printed matter without manufacturing defects and without trouble in manufacturing. .

  The present invention will be described in more detail. In the present invention, it is important to satisfy the relational expression of claim 1.

  In the present invention having the particles in the hydrophilic layer, it can be seen that the production stability and performance largely vary depending on the state of the transport roll that touches the coating film after coating and drying, and within the scope of the present invention. It was found that it can be manufactured stably and the performance can be secured stably.

  The coated film immediately after coating and drying is not sufficiently stable on the film surface itself, and particularly in the layer having particles in the hydrophilic layer, particles are detached, which may cause other materials to be detached. It has become clear from the present invention that the conveying roll itself touching the surface is contaminated and the surface roughness of the coating film varies.

  In the present invention, it was found that if the above-mentioned claims are satisfied, the coated film surface is stably manufactured and the performance is also stable.

  The material of the transport roll is not particularly limited to metal and rubber. Examples of the metal include stainless steel, aluminum, nickel, iron, copper, titanium, and alloys thereof. Stainless steel that is resistant to wear, rust, or chemicals is preferable.

  Examples of the rubber material include, but are not limited to, silicone rubber, polybutadiene rubber, ethylene propylene rubber, nitrile rubber, styrene butadiene rubber, and butyl rubber.

  The particulate matter of the present invention is defined as follows. The particulate matter indicates a filler having a particle size, a matting agent, a dispersion, and a binder (undissolved matter, polymer) that is insoluble in a solvent, and these may be used in combination. The shape may be spherical, acicular, or indefinite.

Examples of the filler that can be cited as the particulate matter of the present invention include carbon black, graphite, TiO ₂ , BaSO ₄ , ZnS, MgCO ₃ , CaCO ₃ , ZnO, CaO, WS ₂ , MoS ₂ , MgO, SnO ₂ , Al _2. O ₃ , α-Fe ₂ O ₃ , α-FeOOH, SiC, CeO ₂ , BN, SiN, MoC, BC, WC, titanium carbide, corundum, artificial diamond, garnet, garnet, quartzite, triboli, diatomaceous earth, Examples thereof include inorganic fillers such as dolomite and organic fillers such as polyethylene resin particles, fluororesin particles, guanamine resin particles, acrylic resin particles, silicon resin particles, and melamine resin particles.

  As the matting agent that can be cited as the particulate matter of the present invention, a matting agent having a core-shell structure is preferable. The particles having a core-shell structure are particles obtained by fixing particles to a portion that becomes a shell on the surface of the core particles. The core particles and the particles that become the shell may be inorganic particles or organic particles. The core particles may be fixed (coated) in a number of layers with the shell particles. The average particle diameter of the core particles is preferably from 0.1 to 15 μm, more preferably from 1 to 10 μm. In particular, surface irregular particles are preferable.

  In the surface uneven particles, the average particle size of the small particles is preferably 1/3 or less, more preferably 1/10 or less, of the average particle size of the core particles. The average particle diameter of the surface irregular particles is preferably not more than 15 μm, and preferably 0.1 μm or more. The coverage of the small particles fixed on the surface of the core particles can be arbitrarily selected within the range in which the effect of the present invention appears.

  For example, the surface irregularity particles may be obtained by, for example, a method using the hetero-aggregation method described in “New Development of Fine Particle Polymer” edited by Toray Research Center Co., Ltd., a method using a polymerization reaction from the core particle surface, “Particle Design” It can be easily produced using a dry agglomeration stirring method using a hybridizer described in “Engineering”. Certain core-shell particles can be produced by precipitating small particles on the surface of the core particles.

  The compound that can be cited as the particulate matter of the present invention includes wax, and specific compounds include beeswax, candelilla wax, paraffin wax, ester wax, montan wax, carnauba wax, amide wax, polyethylene wax, microcrystalline wax, and the like. Solid waxes.

  Silicon compounds can also be used as the particles of the present invention. Specific compounds as silicon compounds (including wax-like compounds) include straight silicone oils such as dimethyl silicone oil, methylphenyl silicone oil, and methylhydrogen silicone oil, olefin-modified silicone oil, polyether-modified silicone oil, and epoxy. Modified silicone oil, epoxy / polyether modified silicone oil, alcohol modified silicone oil, fluorine modified silicone oil, amino modified silicone oil, phenol modified silicone oil, mercapto modified silicone oil, carboxy modified silicone oil, higher fatty acid modified silicone oil, carnauba modified Silicone oil, amide-modified silicone oil, radical-reactive silicone oil such as (meth) acrylic-modified silicone oil, silicone diol, silicon Terminal reactive silicone oil diamine, a halogen group, an alkoxy group, and an ester group, an amide group, an organic modified silicone oil modified with an imide group.

  In the present invention, metal atom-containing particles can be used as the particulate matter. The metal atom-containing particles are a general term for compounds such as metals such as iron, chromium, manganese, cobalt, nickel, copper, zinc, titanium, silver, aluminum, gold, and platinum, or oxides thereof.

  Examples of the metal atom-containing particles include ferromagnetic iron oxide powder, ferromagnetic metal powder, and cubic plate powder.

Examples of the ferromagnetic iron oxide include γ-Fe ₂ O ₃ , Fe ₃ O ₄ , or intermediate iron oxides represented by FeO _x (1.33 <x <1.50). Ferromagnetic metal powders include Fe, Co, Fe—Al, Fe—Al—Ni, Fe—Al—Zn, Fe—Al—Co, Fe—Al—Ca, Fe—Ni. Fe-Ni-Al, Fe-Ni-Co, Fe-Ni-Zn, Fe-Ni-Mn, Fe-Ni-Si, Fe-Ni-Si-Al-Mn, Fe-Ni -Si-Al-Zn, Fe-Ni-Si-Al-Co, Fe-Al-Si, Fe-Al-Zn, Fe-Co-Ni-P, Fe-Co-Al-Ca Ferromagnetic metal powders such as metal magnetic powders mainly composed of Ni, Co, Fe, Ni, Co, etc. Among them, Fe metal powders are preferred, for example, Co-containing γ-Fe ₂ O ₃ , Co coated Adhered γ-Fe ₂ O ₃ , Co-containing Fe ₃ O ₄ , Co-coated Fe ₃ O ₄ , Co-containing magnetic Fe Examples include cobalt-containing iron oxide magnetic powders such as O _x (4/3 <x <3/2) powders.

  The support used in the present invention is not particularly limited, and a plastic support, paper treated with polyolefin or the like, and a composite support obtained by appropriately bonding these materials can also be used.

  Examples of the plastic film include polyethylene terephthalate, polyethylene naphthalate, polyimide, polyamide, polypropylene, polyethylene, polyvinyl chloride, acetate, nylon, polyetherimide, polycarbonate, polysulfone, polyphenylene oxide, polyphenylene sulfide, and cellulose esters. it can. These plastic films are preferably subjected to easy adhesion treatment or undercoat layer coating on the coated surface in order to improve the adhesion to the coated layer. Examples of the easy adhesion treatment include corona discharge treatment, flame treatment, and ultraviolet irradiation treatment. Examples of the undercoat layer include a layer containing gelatin or latex.

  In the present invention, a binder is used, and the binder used can be used without any particular limitation. Binder resins include polyurethane, polyester, vinyl chloride resins such as vinyl chloride copolymers, vinyl chloride resins such as vinyl chloride-vinyl acetate copolymers, polyolefin resins such as butadiene-acrylonitrile copolymers, polyvinyl Polyvinyl acetal resin such as butyral, cellulose resin such as nitrocellulose, styrene resin such as styrene-butadiene copolymer, acrylic resin such as polymethyl methacrylate, polyamide, phenol resin, epoxy resin, phenoxy resin, polyvinyl butyral And acetal resins such as polyvinyl acetoacetal and polyvinyl formal, and water-soluble resins such as polyvinyl alcohol and gelatin. The binder resin may be used alone or in combination of two or more.

  The image forming layer of the lithographic printing original plate of the present invention may be selected from heat-meltable particles that can be fused by heat and substances that exhibit lipophilicity by heat.

Examples of heat-meltable particles that can be fused by heat include waxes, acrylic resins, ionomer resins, vinyl acetate resins, vinyl chloride resins, synthetic rubbers, polyurethane resins, polyester resins, fluorine resins, silicone resins, etc. And those obtained from latex or emulsion dispersed in water. Of these, those having a melting point of 70 to 180 ° C. are preferred, and the hydrophilic component of the surface energy is preferably 100 μN / cm ² or less. When the melting point is lower than this temperature, the performance during storage tends to deteriorate, and when it is higher than this temperature, the image strength cannot be obtained and the printing durability tends to deteriorate. Further, when the surface energy is within this range, the ink deposition property of the image portion is improved. In this respect, waxes, acrylic resins, and synthetic rubbers are particularly preferable as the hot-melt material.

  Examples of waxes that can be used in the present invention include carnauba wax, beeswax, whale wax, wood wax, jojoba oil, lanolin, ozokerite, paraffin wax, montan wax, candelilla wax, ceresin wax, microcrystalline wax, rice wax, and the like. Natural wax, polyethylene wax, Fischer-Tropsch wax, montan wax derivative, paraffin wax derivative, microcrystalline wax derivative, higher fatty acid and the like. In order to facilitate emulsification, these waxes can be oxidized to introduce polar groups such as hydroxyl groups, ester groups, carboxyl groups, aldehyde groups, and peroxide groups.

  A hydrophilic binder is added to the image forming layer containing heat-fusible particles that can be fused by heat in order to give the film-forming property of the image-forming layer within a range that does not impair the fusing property of the particles during laser exposure. You may make it contain.

  Usable hydrophilic binders include, for example, polyvinyl alcohol, poly (meth) acrylic acid, poly (meth) acrylamide, polyhydroxyethyl (meth) acrylate, polyvinyl methyl ether, or natural binders such as gelatin, polysaccharides, Examples thereof include dextran, pullulan, cellulose, gum arabic, and arginic acid. Further, the hydrophilic binder may be a water-insoluble, alkali-soluble or swellable resin having a phenolic hydroxy group and / or a carboxyl group. Various surfactants and colloidal silica can also be used.

  As a substance that exhibits lipophilicity by heat, a hot-melt substance having a melting point of 70 to 180 ° C. can be used. As waxes, carnauba wax, beeswax, whale wax, wood wax, jojoba oil, lanolin, ozokerite, paraffin wax Natural waxes such as montan wax, candelilla wax, ceresin wax, microcrystalline wax, rice wax, polyethylene wax, Fischer-Tropsch wax, montan wax derivative, paraffin wax derivative, microcrystalline wax derivative, higher fatty acid, etc. are acrylic resins In, for example, methyl methacrylate, butyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, styrene, or the like is copolymerized, or synthetic rubbers are polybutadiene. , Polyisoprene, polychloroprene, styrene-butadiene copolymer, acrylic ester-butadiene copolymer, methacrylic ester-butadiene copolymer, isobutylene-isoprene copolymer, acrylonitrile-butadiene copolymer, acrylonitrile- Examples include isoprene copolymers and styrene-isoprene copolymers. In addition, ionomer resins, vinyl acetate resins, vinyl chloride resins, polyurethane resins, polyester resins, fluorine resins, silicone resins, and the like can be used. These lipophilic agents are preferably used in the form of an aqueous dispersion in terms of ease of coating. As another embodiment, there can be mentioned a thermal cross-linking agent covered with a thermally destructible hydrophilic coating material, and a thermal cross-linking agent in which a functional group is blocked by a protecting group dissociated by heat. These thermal crosslinking agents are described as lipophilic components microencapsulated in JP-A Nos. 7-1849, 7-1850, 9-311443, 10-6468, and 10-111168.

  The hydrophilic layer described in the present invention is defined as a layer that can take in more water when an emulsified solution of water and ink comes during printing.

  In the present invention, other layers may be formed between the support and the hydrophilic layer. For example, there are an undercoat layer that improves the adhesion of the hydrophilic layer, a swell forming layer that imparts a gentle roughness at a long wavelength, and a cushion layer that relieves stress applied to the hydrophilic layer. Any one of these layers may contain a photothermal conversion material.

  The planographic printing original plate of the present invention can be produced by providing a photosensitive layer on the above-mentioned support.

  The photosensitive layer is prepared by kneading a binder resin and a colorant, and if necessary, a lubricant, a dispersant, an antistatic agent, a filler, a filler, and a solvent with a solvent to prepare a high-concentration photosensitive layer forming composition, This can be diluted to form a photosensitive layer-forming composition for coating, which can be formed by coating and drying on a support.

  The organic solvent used in the paint for forming the photosensitive layer is not particularly limited as long as it can dissolve or disperse the above-described composition and the metal ion complex dye represented by the general formula. For example, alcohols (ethanol , Propanol etc.), cellosolves (methyl cellosolve, ethyl cellosolve), aromatics (toluene, xylene, chlorobenzene etc.), ketones (acetone, methyl ethyl ketone etc.), ester solvents (ethyl acetate, butyl acetate etc.), ether (Tetrahydrofuran, dioxane, etc.), halogen solvents (chloroform, dichlorobenzene, etc.), amide solvents (for example, dimethylformamide, N-methylpyrrolidone, etc.) and the like can be used. In addition, the kneading dispersion of the colorant layer components is a two roll mill, a three roll mill, a ball mill, a pebble mill, a cobol mill, a tron mill, a sand mill, a sand grinder, a Sqgvari attritor, a high speed impeller disperser, a high speed stone mill, a high speed impact mill, Dispers, high-speed mixers, homogenizers, ultrasonic dispersers, open kneaders, continuous kneaders, and the like can be used.

  Formation of the photosensitive layer on the support can be performed, for example, by coating and drying with an extrusion type extrusion coater. In order to increase the hardness of the photosensitive layer surface in order to obtain a high-resolution image, the surface is formed. Calendar processing may be performed.

  As the exposure light source for forming an image on the lithographic printing original plate of the present invention, any light source capable of being sensitive to the metal ion complex dye represented by the above general formula can be used without particular limitation. Among them, in order to obtain a high resolution, an electromagnetic wave whose energy application area can be narrowed down, particularly an ultraviolet ray having a wavelength of 1 nm to 1 mm, a visible ray, and an infrared ray are preferable. As a light source capable of applying such light energy, for example, a laser, Light emitting diodes, xenon flash lamps, halogen lamps, carbon arc lamps, metal halide lamps, tungsten lamps, quartz mercury lamps, high pressure mercury lamps and the like can be mentioned. The energy applied at this time can be selected and used in a timely manner by adjusting the exposure distance, time, and intensity depending on the type of image forming material.

Laser light sources used in the printing method of the present invention are generally well-known solid lasers such as ruby laser, YAG laser, and glass laser; He-Ne laser, Ar ion laser, Kr ion laser, CO ₂ laser, CO laser Gas lasers such as He-Cd laser, N ₂ laser, excimer laser; semiconductor lasers such as InGaP laser, AlGaAs laser, GaAsP laser, InGaAs laser, InAsP laser, CdSnP ₂ laser, GaSb laser; chemical laser, dye laser, etc. Among these, in order to efficiently cause ablation, a laser having a wavelength of 600 to 1200 nm is preferable in terms of sensitivity because it can convert light energy into heat energy.

  The printing method of the present invention is characterized in that printing is performed without performing development processing after laser exposure based on image information.

  The on-press development in the present invention has the following contents. A method for removing an unexposed portion of an image forming layer of a lithographic printing plate precursor by mounting the exposed lithographic printing plate precursor on a cylinder of a printing press and supplying dampening water and ink while rotating the cylinder. It is. In other words, the lithographic printing plate precursor is exposed and then mounted on a printing machine as it is, and the development process is completed in a normal printing process.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, the aspect of this invention is not limited to this. In addition, the following "part" represents a "mass part".

<< Preparation of Support >>: Preparation of Polyester Film (Support 1: Polyethylene terephthalate support)
Using terephthalic acid and ethylene glycol, PET of IV (inherent viscosity) = 0.66 (dl / g) (measured at 25 ° C. in phenol / tetrachloroethane = 6/4 (mass ratio)) was obtained according to a conventional method. . This is pelletized, dried at 130 ° C. for 4 hours, melted at 300 ° C., extruded from a T-die, rapidly cooled on a cooling drum at 50 ° C., and not yet thick enough to have an average film thickness of 175 μm after heat setting. A stretched film was prepared. With respect to the drawing temperature, the first drawing was stretched 1.3 times at 102 ° C. and the second drawing was longitudinally stretched 2.6 times at 110 ° C. Then, it was stretched 4.5 times at 120 ° C. with a tenter. Thereafter, the film was heat-fixed at 240 ° C. for 20 seconds and relaxed by 4% in the lateral direction at the same temperature. Thereafter, the chuck portion of the tenter was slit, knurled at both ends, cooled to 40 ° C. and wound at 4.8 kg / m. In this way, a biaxially stretched PET film having a thickness of 190 μm was obtained. The biaxially stretched PET film had a Tg of 79 ° C. The width of the obtained PET film (film forming width) was 2.5 m. Further, the thickness distribution of the obtained support 1 was 3%.

<< Preparation of underdrawn support 1 >>
Both sides of the film of the support 1 obtained above were subjected to a corona discharge treatment of 8 W / m ² · min, and then, as shown in Table 4, the following undercoat coating solution a was applied to one side as a dry film. After coating to a thickness of 0.8 μm, the undercoating liquid b was applied to a dry film thickness of 0.1 μm while performing corona discharge treatment (8 W / m ² · min), each at 180 ° C. for 4 minutes. Dried (undercoating surface A). Also, after coating the following undercoat coating solution c on the opposite side so as to have a dry film thickness of 0.8 μm, the undercoat coating solution d is dried film thickness 1 while performing corona discharge treatment (8 W / m ² · min). The coating was applied to a thickness of 0.0 μm and dried at 180 ° C. for 4 minutes (undercoating surface B). The surface electrical resistance of the undercoat surface B after coating at 25 ° C. and 25% RH was 10 ⁸ Ω.

  Plasma treatment was performed on the surface of each undercoat layer under the following plasma treatment conditions.

<< Undercoat coating liquid a >>
Styrene / glycidyl methacrylate / butyl acrylate = 60/39/1 terpolymer copolymer latex (Tg = 75 ° C.) (based on solid content) 6.3%
Styrene / glycidyl methacrylate / butyl acrylate = 20/40/40 terpolymer latex 1.6%
Anionic surfactant S-1 0.1%
Water 92.0%
<< Undercoat coating liquid b >>
Gelatin 1%
Anionic surfactant S-1 0.05%
Hardener H-1 0.02%
Matting agent (silica, average particle size 3.5 μm) 0.02%
Antifungal agent F-1 0.01%
Water 98.9%

<< Undercoat coating liquid c >>
Styrene / glycidyl methacrylate / butyl acrylate = 20/40/40 terpolymer latex (based on solid content) 0.4%
Styrene / glycidyl methacrylate / butyl acrylate / acetoacetoxyethyl methacrylate = 39/40/20/1 quaternary copolymer latex 7.6%
Anionic surfactant S-1 0.1%
Water 91.9%
<< Undercoat coating liquid d >>
Conductive composition of component d-1 / component d-2 / component d-3 = 66/31/1 6.4%
Hardener H-2 0.7%
Anionic surfactant S-1 0.07%
Matting agent (silica, average particle size 3.5 μm) 0.03%
92.8% water
Component d-1;
An anionic polymer compound comprising a copolymer of sodium styrenesulfonate / maleic acid = 50/50; component d-2;
Three-component copolymer latex consisting of styrene / glycidyl methacrylate / butyl acrylate = 40/40/20 component d-3;
Polymeric activator comprising styrene / sodium isoprenesulfonate = 80/20

<< Plasma treatment conditions >>
Using a batch type atmospheric pressure plasma processing apparatus (EC-I-H-340, manufactured by EC Chemical Co., Ltd.), the high frequency output is 4.5 kW, the frequency is 5 kHz, the processing time is 5 seconds, and the gas conditions are argon, Plasma treatment was performed at a volume ratio of nitrogen and hydrogen of 90% and 5%, respectively.

《Heat treatment conditions》
The support after slitting to a width of 1.25 m was subjected to low tension heat treatment at 180 ° C. for 1 minute at a tension of 2 hPa.

  The polyester film was provided on the undercoat surface A side of the polyester film having a thickness of 175 μm and a width of 120 cm in the order of the following coating solutions. The coating solution was applied using a wire bar so that the dried film became 3.2 μm. At this time, the roll touching the coating film was made of stainless steel, and V1 = 40, V2 = 5.0, P = 0.40, and T = 250 were set.

First hydrophilic layer coating solution Snowtex-XS [Nissan Chemical Industry Co., Ltd.] Average particle size 0.005 μm 9.62 parts Snowtex-ZL [Nissan Chemical Industry Co., Ltd.] Average particle size 0.085 μm 0.6 parts Shilton JC -40 [Mizusawa Chemical Co., Ltd.] Average particle size 4.0 μm 2.22 parts STM-6500S [Nissan Chemical Industry Co., Ltd.] Coated particle average particle size 6.5 μm 3 parts Carboxymethylcellulose sodium [Kanto Chemical Co., Ltd.] 12 parts Mineral colloid MO [Wilver-Ellis Co., Ltd.] 0.22 parts MF-4500 Black [Daiichi Seika Kogyo Co., Ltd.] Photothermal conversion material 4 parts Trisodium phosphate 12 water [Kanto Chemical Co., Ltd.] 0.06 parts FZ-2161 [Nippon Unicar Co., Ltd.] 0.16 parts pure water 80 parts Furthermore, the 2nd hydrophilic layer coating liquid of the following content was provided. The following hydrophilic layer was applied using a wire bar so as to have a dry film thickness of 0.6 μm.

Second hydrophilic layer coating solution Snowtex-S [Nissan Chemical Industry Co., Ltd.] Average particle size 0.009 μm 1.56 parts Snowtex-PSM [Nissan Chemical Industry Co., Ltd.] Average particle size 0.095 μm
2.34 parts Silton JC-20 [Mizusawa Chemical Industry Co., Ltd.] Average particle size 1.5 μm 1.2 parts AMT-08 [Mizusawa Chemical Industry Co., Ltd.] Average particle size 0.95 μm 3.6 parts MP-4540 [Nissan Chemical Industry Co., Ltd.] Average particle size 0.45 μm 1.8 parts Sodium carboxymethylcellulose [Kanto Chemical Co., Ltd.] 0.12 parts Mineral colloid MO [Wilver-Ellis Co., Ltd.] 0.24 parts MF-4500 Black [Daiichi Seika Kogyo Co., Ltd.] Photothermal conversion material 1.08 parts Trisodium phosphate 12 water [Kanto Chemical Co., Ltd.] 0.06 parts Pure water 88 parts At this time, the roll touching the coating film is made of stainless steel, V1 = 40 V2 = 5.0, P = 0.40, T = 250.

The following image forming layer application | coating was performed to the obtained hydrophilic layer laminated product using the gravure coating apparatus so that it might become a dry film thickness 0.60 (g / m < ² >).

Image forming layer HI-DISPER A-206 [Gifu Shellac Manufacturing Co., Ltd.]
Average particle size of heat-meltable particles 0.5 μm 2.375 parts DL-522 [Nippon Catalyst Co., Ltd. average molecular weight 170.000] 0.7125 parts HI-DISPER A118 [Gifu Shellac Manufacturing Co., Ltd.]
Average particle diameter of heat-fusible particles 0.3 μm 6.4125 parts Pure water 90.5 parts At this time, the roll touching the coating film is made of stainless steel, V1 = 40, V2 = 5.0, P = 0.40. , T = 250. This sample is No. 101. No. As shown in Table 1, V1, V2, P and T were changed using the coating solution No. 101, and sample No. 102-119 were produced. Note that V1, V2, P, and T of the first hydrophilic layer, the second hydrophilic layer, and the image forming layer are No. 1 under the same conditions for each sample. It applied like 101.

  In the following samples, the same evaluation was performed by changing the material of the transport roll and the image forming layer.

Sample No. 116
Sample No. using butyl rubber with a hardness of 30 ° as the material of the transport roll. 117
Sample No. except that A-206 of the image forming layer was 1.9 parts and FZ-2161 [Nihon Unicar Co., Ltd.] was 0.475 parts. Same as 101. The obtained samples were evaluated as follows.

~ Evaluation ~
Evaluation of coating defects The number of omissions per sample m ² 100 and 2000 m after coating was counted. There are many bad coating defects.

Evaluation of missing size The size (μm) of the largest missing coating failure per sample m ² 100 and 2000 m after coating was measured.

Average surface roughness As a guideline for evaluating the coating accuracy of the length and width, the surface roughness after coating and drying was measured after measuring the average surface roughness of m ² after 100 and 2000 m. The average surface roughness was measured by RST + TLUS manufactured by WYKO.

Conveyance roll stains The conveyance roll stains of sample m ² after 100 and 2000 m after application were evaluated in the following rank.
5: None at all 4; Slightly, no actual harm area 3; Slightly, actual harm concern area 2; Occurrence, actual damage level 1: Very many occurrences, actual damage, need of process cleaning Further evaluation was performed.

-Exposure and printing of lithographic printing plate-
Using the obtained lithographic printing original plate, a 50% halftone image and a solid image corresponding to 175 lines using a semiconductor laser light source (light source wavelength 830 nm, spot size 10 μm, resolution is 2000 dpi in both scanning direction and sub-scanning direction) The exposure was performed with the irradiation energy amount on the image surface being 250 mJ / cm ² while changing the scanning speed. In addition, dpi represents the number of dots per 2.54 cm.

The exposed lithographic printing original plate is attached to a Heidel GTO printing machine without developing, and 45 times water diluted solution of SEU-3 (manufactured by Konica Co., Ltd.) is used as an etching solution, and HyEcho (Toyo Ink Co., Ltd.) is used as an ink. )), And printing was performed using high-quality paper as printing paper.
Printing was performed in an environment of 23 degrees 48%.

Finished quality of printed matter The finished quality of the 30th sheet after the start of printing was visually evaluated by the following rank.
5: Quality is good 4: Quality is slightly inferior, but there is no problem in use 3: Quality is inferior, but usable level 2: Poor quality, actual harm concern level 1: Poor quality, unusable Printing durability 50% halftone dot of print is reproduced The number of parts that were not evaluated was visually evaluated. The larger the number, the higher the printing durability and the better.

  As can be seen from Table 1, if the present invention is satisfied, a sample having a sufficiently stable coating property is obtained.

Claims (2)

In a method for producing a lithographic printing original plate in which a hydrophilic layer having particles and an image forming layer are sequentially provided on a plastic film support that is continuously conveyed, the conveyance speed of the plastic film support is V1 (m / Min), the conveyance speed of the conveyance roll that touches the coating film after coating and drying is V2 (m / min), the dynamic friction coefficient between the conveyance roll and the coating film is P, and the coating film is on the conveyance roll that touches the surface. Lithographic printing, characterized in that at least one layer of the hydrophilic layer and at least one layer of the image forming layer satisfy the following relational expression when T (g / cm) is applied to the base width cm when touching A method for producing an original plate.
0.005V1 <V2 <2V1
0.10 <P <0.95
5 <T <1500 A printing method comprising: printing a lithographic printing plate precursor obtained by the production method according to claim 1 after performing laser exposure based on image information, performing on-machine development, and printing.