JP2007256546A - Plate-making method for photosensitive planographic printing plate, and automatic developing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate-making method for a photosensitive planographic printing plate which can enhance the productivity (reduce the start-up time and the warming up) and reduce power consumption, uniformly heat the photosensitive planographic printing plate and is superior in dot reproducibility during continuous processing, and to provide an automatic developing machine. <P>SOLUTION: In the plate making method for the photosensitive planographic printing plate, a photosensitive planographic printing plate material, having a radiation-sensitive photosensitive layer on the base is heated up to 80 to 150°C by using an electromagnetic induction heating system, during development processing, after the photosensitive planographic printing plate material has been exposed to an image pattern. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for making a photosensitive lithographic printing plate and an automatic processor, and more particularly, to a method for making a negative lithographic printing plate which can be directly made by irradiating a laser based on a digital signal and an automatic developing process. It relates to a developing machine.

  Conventionally, as a method for making a printing plate directly from digitized image data without using a lithographic film, an electrophotographic method or a high-sensitivity photopolymer which can be written with a relatively small output laser emitting blue or green is used. There are known a method, a method using a silver salt or a composite system of silver salt and another system, a method of generating an acid by heat mode laser exposure, and obtaining a thermosetting image by post-heating using the acid as a catalyst.

  A photosensitive lithographic printing plate (hereinafter also referred to as a lithographic printing plate or plate material) is developed by a photosensitive lithographic printing plate processing apparatus (automatic developing machine).

  The development processing in this automatic developing machine is carried out by transporting the photosensitive lithographic printing plate material on which an image has been recorded into the developing tank and immersing it in the developing liquid stored in the developing tank while transporting in the developing tank. This is done by removing the photosensitive layer of the non-image portion of the photosensitive lithographic printing plate material by rubbing means such as a rotating brush roller provided therein. In this automatic developing machine, the lithographic printing plate that has been processed with the developer is desensitized by applying a gum solution in the desensitizing section after being washed with washing water in the washing section (water washing process). After the processing is performed, processing such as plate surface protection is continuously performed.

As the photosensitive layer of the photosensitive lithographic printing plate material, a diazo resin, a photocrosslinking type, or a polymerization type is used. Since the polymerizable photosensitive layer is radical polymerization, the reaction tends to proceed due to radicals present in the photosensitive layer even after the exposure is completed. As a result, the reaction becomes uneven due to the atmosphere and time difference after exposure, the printing endurance of the photosensitive layer and the size of the halftone dots forming the image formed on the printing plate are changed, and the obtained image quality is deteriorated. However, there is generally known a means for improving printing durability by heating to 100 to 300 ° C. after development processing, but it is insufficient for image quality before development processing. It was. (For example, see Patent Document 1)
Therefore, by heating with an infrared heater (preheating) before development of the photosensitive lithographic printing plate material, the surface temperature of the photosensitive lithographic printing plate material is made uniform to prevent unevenness in the reaction, and the image It has been proposed that the quality be constant. (For example, see Patent Document 2)
However, when heated to 100 ° C. or higher, the support is deformed due to thermal expansion, thermal contraction, etc., and the distance from the heater is not constant, so the heating temperature becomes non-uniform and the image quality is not stable.

Further, a method has been proposed in which writing is performed by irradiating an infrared laser beam while the lithographic printing plate precursor is heated to 40 to 110 ° C. (For example, see Patent Document 3)
However, it is not realistic because the environmental temperature becomes extremely high by introducing a heating device into the exposure apparatus.

On the other hand, the heating method of the infrared heater requires several tens of minutes from when the apparatus power is turned on until it reaches a predetermined temperature, which is a factor of reducing productivity.
JP-A-7-101175 JP-A-4-230760 JP-A-11-58666

  The object of the present invention is to uniformly heat the photosensitive lithographic printing plate, reduce productivity (start-up time) (warm-up), reduce power consumption, and have excellent halftone dot reproducibility during continuous processing. It is to provide a plate making method and an automatic developing machine.

  The object of the present invention is achieved by the following configurations.

  1. A photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on a support is imagewise exposed and then heated to 80 to 150 ° C. using an electromagnetic induction heating method during development processing. A process for making a photosensitive lithographic printing plate.

  2. After the photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on the support is imagewise exposed, in an automatic processor having a developing step, a post-processing step, and a drying step, the post-processing step is performed after the exposure. An automatic processor characterized by having a heating step for heating the photosensitive lithographic printing plate material, and the heating means in the heating step uses an electromagnetic induction heating method.

  The photosensitive lithographic printing plate making method and automatic processor according to the present invention uniformly heats the photosensitive lithographic printing plate, and can reduce productivity (reduction in start-up time (warm-up), power consumption, and continuous processing). This has an excellent effect on the reproducibility of halftone dots.

  Hereinafter, the present invention will be described in more detail.

  In the present invention, a photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on a support is imagewise exposed and then heated to 80 to 150 ° C. using an electromagnetic induction heating method during development processing. The plate making method of the photosensitive lithographic printing plate characterized by the above-mentioned, and with these constitutions, the halftone dot reproducibility during continuous processing, which is the object of the present invention, can be improved.

  In the invention of claim 2, the photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on the support is imagewise exposed and then exposed in an automatic processor having a developing step, a post-processing step, and a drying step. It is an automatic processor characterized by having a heating step for heating the photosensitive lithographic printing plate material after the post-processing step, and the heating means in the heating step uses an electromagnetic induction heating method.

  The electromagnetic induction heating method in the present invention will be described with reference to FIG.

  FIG. 1 is a cross-sectional view showing an example of a heating unit using an electromagnetic induction heating method.

  From the inside to the outside, a metal core 824, an elastic layer 823 made of heat-resistant foam rubber molded integrally with the outside of the core 824, a heat generation layer 821 made of a metal tube, and the outside of the heat generation layer 821 The release layer 822 is provided. 827 is a hollow cylindrical pressure roller made of heat resistant resin, and a ferrite core 826 around which an exciting coil 825 is wound is installed.

  The ferrite core 826 presses the heat generating roller 820 via the pressure roller 827, thereby forming a nip portion 829. When a high frequency current is passed through the exciting coil 825 while the heat generating roller 820 and the pressure roller 827 rotate in the direction of the arrow, an alternating magnetic field H is generated, and the heat generating layer 821 of the heat generating roller 820 is heated by electromagnetic induction and rapidly rises. Warm up to a predetermined temperature.

  In this state, the photosensitive lithographic printing plate material 840 is inserted into and passed through the nip portion 829 while continuing predetermined heating, thereby heating uniformly.

  A magnetic shield layer that prevents magnetic flux from entering the core material may be provided between the core material 824 and the elastic layer 823. Since it is possible to further prevent the magnetic flux from penetrating into the core material through the magnetic shield layer, heat generation of the core material can be further suppressed. In addition, it is easy to ensure the strength of the core material.

  The heat generating layer contains a magnetic material such as iron, and a non-magnetic material such as silver or nickel. It is particularly preferable to contain a nonmagnetic material having a small heat capacity.

Photosensitive lithographic printing plate material (plate material)
In the present invention, the photosensitive lithographic printing plate material comprises a photosensitive composition comprising a polymerization initiator on a support, a dye having an absorption maximum near the laser wavelength, a compound having an ethylenically polymerizable group, and a polymer binder. A photosensitive layer. If necessary, an oxygen barrier layer mainly composed of polyvinyl alcohol or a protective layer for protecting the photosensitive layer may be provided.

Polymerization initiators As polymerization initiator systems, for example, J.M. Carbonyl compounds, organic sulfur compounds, persulfides, redox compounds, azo, diazo compounds, halogen compounds, and photoreductive dyes as described in Chapter 5 of “Light Sensitive Systems” by J. Kosar Etc. More specific compounds are disclosed in British Patent 1,459,563.

  That is, the following can be used as the polymerization initiator.

  Benzoin derivatives such as benzoin methyl ether, benzoin-i-propyl ether, α, α-dimethoxy-α-phenylacetophenone; benzophenone, 2,4-dichlorobenzophenone, methyl o-benzoylbenzoate, 4,4′-bis (dimethyl) Benzophenone derivatives such as amino) benzophenone; thioxanthone derivatives such as 2-chlorothioxanthone and 2-i-propylthioxanthone; anthraquinone derivatives such as 2-chloroanthraquinone and 2-methylanthraquinone; N-methylacridone, N-butylacridone and the like In addition to α, α-diethoxyacetophenone, benzyl, fluorenone, xanthone and uranyl compounds, JP-B-59-1281, 61-9621 and JP-A-60-60104 Triazine derivatives; organic peroxides described in JP-A-59-1504 and JP-A-61-243807; JP-B-43-23684, JP-A-44-6413, JP-A-44-6413, JP-A-47-1604, and US patents Diazonium compounds described in US Pat. No. 3,567,453; organic azide compounds described in US Pat. Nos. 2,848,328 and 2,852,379 and 2,940,853; O-quinonediazides described in JP-A Nos. 13109, 38-18015 and 45-9610; JP-B-55-39162, JP-A-59-14023 and “Macromolecules”, Vol. 10, 1307 Various onium compounds described on page 1977; azo compounds described in JP-A-59-142205 Compound: JP-A-1-54440, European Patents 109,851, 126,712 and “Journal of Imaging Science (J. Imag. Sci.)”, Vol. 30, 174 (1986) (Oxo) sulfonium organoboron complexes described in Japanese Patent Application Nos. 4-56831 and 4-89535; titanocenes described in JP-A-59-152396 and JP-A-61-151197; * Coordination Chemistry Review, 84, 85-277) (1988) and transition metal complexes containing transition metals such as ruthenium described in JP-A-2-182701; described in JP-A-3-209477 Of 2,4,5-triarylimidazo Dimer; carbon tetrabromide, organic halogen compounds described in JP-A 59-107344, triaryl monoalkyl borate salts, iron arene complexes.

Dye In the present invention, a sensitizing dye is preferably added to the photosensitive layer. It is preferable to use a dye having an absorption maximum wavelength near the wavelength of the light source as a sensitizing dye.

  Examples of compounds for wavelength sensitization from visible light to near infrared include cyanine, phthalocyanine, merocyanine, porphyrin, spiro compound, ferrocene, fluorene, fulgide, imidazole, perylene, phenazine, phenothiazine, polyene, azo compound, diphenylmethane, triphenyl Methane, polymethine acridine, coumarin, coumarin derivatives, ketocoumarin, quinacridone, indigo, styryl, pyrylium compounds, pyromethene compounds, pyrazolotriazole compounds, benzothiazole compounds, barbituric acid derivatives, thiobarbituric acid derivatives, keto alcohol borate complexes, Xanthene dyes, stilbene derivatives, and triaryloxazole derivatives, and moreover, European Patent No. 568,993, US Patent No. 4,508,811 JP 2001-125255, JP-A-11-271969, compounds described in JP-A-63-260909, etc. can also be used.

  In the present invention, a laser can be used as a recording light source. A preferable laser light source will be described later. When recording is performed using a semiconductor laser having a light emission wavelength in the range of 390 nm to 430 nm as a laser beam of the light source, a so-called violet laser, a dye having an absorption maximum between 390 nm and 430 nm. It is desirable to contain. The dye having an absorption maximum between 390 nm and 430 nm is not particularly limited in terms of structure, but any dye group described above can be used as long as the absorption maximum satisfies the requirement. Specifically, JP-A No. 2002-296664, JP-A No. 2002-268239, JP-A No. 2002-268238, JP-A No. 2002-268204, JP-A No. 2002-221790, JP-A No. 2002-202598, JP-A No. 2001-042524, JP-A No. 2000 are disclosed. -309724, JP2000-258910, JP2000-206690, JP2000-147663, JP2000-098605, JP2003-221517, WO2005 / 029187A1, WO2004 / 049068A1, WO2004 / 074929A2, WO2004 / 0749930A2, etc. Although the described dyes can be used, the present invention is not limited to this.

  Further, when recording is performed using a laser having an emission wavelength in the range of 470 nm to 550 nm as the laser light of the light source, it is desirable to include a dye having an absorption maximum between 470 nm and 550 nm. The dye having an absorption maximum between 470 nm and 550 nm is not particularly limited in structure, but any of the dye groups described above can be used as long as the absorption maximum satisfies the requirement. Specifically, dyes described in JP-A-2001-125255, JP-A-11-271969, JP-A-63-260909 and the like can be used, but the present invention is not limited to these.

Polymer Binder The photosensitive lithographic printing plate used in the invention contains a polymer binder in the polymerizable photosensitive layer.

  Examples of the polymer binder of the present invention include acrylic polymers, polyvinyl butyral resins, polyurethane resins, polyamide resins, polyester resins, epoxy resins, phenol resins, polycarbonate resins, polyvinyl butyral resins, polyvinyl formal resins, shellacs, and other natural materials. Resin etc. can be used. Two or more of these may be used in combination.

  A vinyl copolymer obtained by copolymerization of acrylic monomers is preferred. Furthermore, the copolymer composition of the polymer binder is preferably a copolymer of (a) a carboxyl group-containing monomer, (b) a methacrylic acid alkyl ester, or an acrylic acid alkyl ester.

  Specific examples of the carboxyl group-containing monomer include α, β-unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride and the like. In addition, carboxylic acids such as phthalic acid and 2-hydroxymethacrylate half ester are also preferable.

  Specific examples of alkyl methacrylates and alkyl esters include methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, heptyl methacrylate, octyl methacrylate, nonyl methacrylate. , Decyl methacrylate, undecyl methacrylate, dodecyl methacrylate, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, nonyl acrylate, acrylic In addition to unsubstituted alkyl esters such as decyl acid, undecyl acrylate and dodecyl acrylate, cyclic alkyl esters such as cyclohexyl methacrylate and cyclohexyl acrylate Substituted alkyl esters such as benzyl methacrylate, 2-chloroethyl methacrylate, N, N-dimethylaminoethyl methacrylate, glycidyl methacrylate, benzyl acrylate, 2-chloroethyl acrylate, N, N-dimethylaminoethyl acrylate, and glycidyl acrylate Also mentioned.

  Furthermore, in the polymer binder of the present invention, monomers described in the following (1) to (14) can be used as other copolymerization monomers.

  1) Monomers having an aromatic hydroxyl group, such as o- (or p-, m-) hydroxystyrene, o- (or p-, m-) hydroxyphenyl acrylate and the like.

  2) Monomers having an aliphatic hydroxyl group, such as 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, N-methylol acrylamide, N-methylol methacrylamide, 4-hydroxybutyl methacrylate, 5-hydroxypentyl acrylate, 5-hydroxypentyl methacrylate , 6-hydroxyhexyl acrylate, 6-hydroxyhexyl methacrylate, N- (2-hydroxyethyl) acrylamide, N- (2-hydroxyethyl) methacrylamide, hydroxyethyl vinyl ether and the like.

  3) A monomer having an aminosulfonyl group, such as m- (or p-) aminosulfonylphenyl methacrylate, m- (or p-) aminosulfonylphenyl acrylate, N- (p-aminosulfonylphenyl) methacrylamide, N- (p -Aminosulfonylphenyl) acrylamide and the like.

  4) Monomers having a sulfonamide group, such as N- (p-toluenesulfonyl) acrylamide, N- (p-toluenesulfonyl) methacrylamide and the like.

  5) Acrylamide or methacrylamides such as acrylamide, methacrylamide, N-ethylacrylamide, N-hexylacrylamide, N-cyclohexylacrylamide, N-phenylacrylamide, N- (4-nitrophenyl) acrylamide, N-ethyl-N- Phenylacrylamide, N- (4-hydroxyphenyl) acrylamide, N- (4-hydroxyphenyl) methacrylamide and the like.

  6) Monomers containing fluorinated alkyl groups such as trifluoroethyl acrylate, trifluoroethyl methacrylate, tetrafluoropropyl methacrylate, hexafluoropropyl methacrylate, octafluoropentyl acrylate, octafluoropentyl methacrylate, heptadecafluorodecyl methacrylate, N- Butyl-N- (2-acryloxyethyl) heptadecafluorooctylsulfonamide and the like.

  7) Vinyl ethers such as ethyl vinyl ether, 2-chloroethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, octyl vinyl ether, phenyl vinyl ether and the like.

  8) Vinyl esters such as vinyl acetate, vinyl chloroacetate, vinyl butyrate, vinyl benzoate and the like.

  9) Styrenes such as styrene, methyl styrene, chloromethyl styrene and the like.

  10) Vinyl ketones such as methyl vinyl ketone, ethyl vinyl ketone, propyl vinyl ketone, and phenyl vinyl ketone.

  11) Olefins such as ethylene, propylene, i-butylene, butadiene, isoprene and the like.

  12) N-vinylpyrrolidone, N-vinylcarbazole, 4-vinylpyridine and the like.

  13) Monomers having a cyano group, such as acrylonitrile, methacrylonitrile, 2-pentenenitrile, 2-methyl-3-butenenitrile, 2-cyanoethyl acrylate, o- (or m-, p-) cyanostyrene.

  14) A monomer having an amino group, such as N, N-diethylaminoethyl methacrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylaminoethyl methacrylate, polybutadiene urethane acrylate, N, N-dimethylaminopropyl acrylamide, N, N-dimethylacrylamide, acryloylmorpholine, Ni-propylacrylamide, N, N-diethylacrylamide and the like.

  Further, other monomers that can be copolymerized with these monomers may be copolymerized.

  Furthermore, an unsaturated bond-containing vinyl copolymer obtained by addition-reacting a compound having a (meth) acryloyl group and an epoxy group in the molecule to a carboxyl group present in the molecule of the vinyl copolymer. Is also preferred as a polymer binder. Specific examples of the compound containing both an unsaturated bond and an epoxy group in the molecule include glycidyl acrylate, glycidyl methacrylate, and an epoxy group-containing unsaturated compound described in JP-A No. 11-271969.

  These copolymers preferably have a weight average molecular weight of 1 to 200,000 as measured by gel permeation chromatography (GPC), but are not limited to this range.

  The content of the high molecular polymer in the photosensitive layer composition is preferably in the range of 10 to 90% by mass, more preferably in the range of 15 to 70% by mass, and the sensitivity to use in the range of 20 to 50% by mass. Particularly preferred from the viewpoint.

  Furthermore, the acid value of the resin is preferably used in the range of 10 to 150, more preferably in the range of 30 to 120, and the use in the range of 50 to 90 from the viewpoint of balancing the polarity of the entire photosensitive layer. Particularly preferred, this can prevent pigment aggregation in the photosensitive layer coating solution.

Monomer In the present invention, the compound having an ethylenically polymerizable group, so-called monomers, and polyfunctional oligomers can be contained in the image recording layer. The content of these monomers and polyfunctional oligomers is preferably in the range of 70% by mass or less in the image recording layer. More preferably, it is in the range of 20 to 60% by mass.

  These monomers and polyfunctional oligomers include general radical polymerizable monomers, polyfunctional monomers having a plurality of ethylenic double bonds capable of addition polymerization in a molecule generally used for UV curable resins, Polyfunctional oligomers can be used.

  Although not limited thereto, preferred examples include 2-ethylhexyl acrylate, 2-hydroxypropyl acrylate, glycerol acrylate, tetrahydrofurfuryl acrylate, phenoxyethyl acrylate, nonylphenoxyethyl acrylate, and tetrahydrofurfuryloxyethyl acrylate. , Tetrahydrofurfuryloxyhexanolide acrylate, acrylate of ε-caprolactone adduct of 1,3-dioxane alcohol, monofunctional acrylic acid ester such as 1,3-dioxolane acrylate, or acrylate of these, methacrylate, itaconate, crotonate , Methacrylic acid instead of maleate, itaconic acid, crotonic acid, maleic acid ester such as ethylene glycol Diacrylate, triethylene glycol diacrylate, pentaerythritol diacrylate, hydroquinone diacrylate, resorcin diacrylate, hexanediol diacrylate, neopentyl glycol diacrylate, tripropylene glycol diacrylate, diacrylate of hydroxypivalate neopentyl glycol, Diacrylate of neopentyl glycol adipate, Diacrylate of ε-caprolactone adduct of neopentyl glycol hydroxypivalate, 2- (2-hydroxy-1,1-dimethylethyl) -5-hydroxymethyl-5-ethyl-1, Ε-Caprolac of 3-dioxane diacrylate, tricyclodecane dimethylol acrylate, tricyclodecane dimethylol acrylate Adducts, bifunctional acrylic esters such as diglycidyl ether diacrylate of 1,6-hexanediol, or methacrylic acid, itaconic acid, crotonic acid in which these acrylates are replaced with methacrylate, itaconate, crotonate, maleate, Maleic acid esters, such as trimethylolpropane triacrylate, ditrimethylolpropane tetraacrylate, trimethylolethane triacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate , Ε-caprolactone adduct of dipentaerythritol hexaacrylate, pyrogallolto Multifunctional acrylic acid ester such as acrylate, propionic acid / dipentaerythritol triacrylate, propionic acid / dipentaerythritol tetraacrylate, hydroxypivalylaldehyde-modified dimethylolpropane triacrylate, or these acrylates with methacrylate, itaconate, crotonate, Examples thereof include methacrylic acid, itaconic acid, crotonic acid, and maleic acid ester instead of maleate.

  Prepolymers can also be used as described above. Examples of the prepolymer include compounds as described later, and a prepolymer obtained by introducing acrylic acid or methacrylic acid into an oligomer having an appropriate molecular weight to impart polymerizability can be suitably used. These prepolymers may be used alone or in combination of two or more, and may be used by mixing with the above-mentioned monomers and / or oligomers.

  Examples of prepolymers include adipic acid, trimellitic acid, maleic acid, phthalic acid, terephthalic acid, hymic acid, malonic acid, succinic acid, glutaric acid, itaconic acid, pyromellitic acid, fumaric acid, glutaric acid, pimelic acid, Polybasic acids such as sebacic acid, dodecanoic acid, tetrahydrophthalic acid, and ethylene glycol, propylene glycol, diethylene glycol, propylene oxide, 1,4-butanediol, triethylene glycol, tetraethylene glycol, polyethylene glycol, glycerin, trimethylol Polyester obtained by introducing (meth) acrylic acid into a polyester obtained by combining polyhydric alcohols such as propane, pentaerythritol, sorbitol, 1,6-hexanediol, 1,2,6-hexanetriol Chlorates such as bisphenol A, epichlorohydrin, (meth) acrylic acid, and epoxy acrylates in which (meth) acrylic acid is introduced into an epoxy resin such as phenol novolac, epichlorohydrin, (meth) acrylic acid, such as ethylene glycol, adipine Acid / tolylene diisocyanate / 2-hydroxyethyl acrylate, polyethylene glycol / tolylene diisocyanate / 2-hydroxyethyl acrylate, hydroxyethylphthalyl methacrylate / xylene diisocyanate, 1,2-polybutadiene glycol / tolylene diisocyanate / 2-hydroxyethyl acrylate , Trimethylolpropane, propylene glycol, tolylene diisocyanate, 2-hydroxyethyl acrylate In addition, urethane acrylates in which (meth) acrylic acid is introduced into urethane resin, for example, silicone resin acrylates such as polysiloxane acrylate, polysiloxane diisocyanate, 2-hydroxyethyl acrylate, etc., and (meth) acryloyl in oil-modified alkyd resins Examples thereof include prepolymers such as alkyd-modified acrylates having introduced groups and spirane resin acrylates.

  The photosensitive composition of the present invention includes a phosphazene monomer, triethylene glycol, isocyanuric acid EO (ethylene oxide) modified diacrylate, isocyanuric acid EO modified triacrylate, dimethylol tricyclodecane diacrylate, trimethylolpropane benzoic acid benzoate. Addition-polymerizable oligomers and prepolymers having monomers such as acid esters, alkylene glycol type acrylic acid-modified, urethane-modified acrylates, and structural units formed from the monomers can be contained.

  Furthermore, examples of the ethylenic monomer that can be used in combination with the present invention include phosphate ester compounds containing at least one (meth) acryloyl group. The compound is not particularly limited as long as it is a compound in which at least part of the hydroxyl group of phosphoric acid is esterified and has a (meth) acryloyl group.

  In addition, JP-A-58-212994, 61-6649, 62-46688, 62-48589, 62-173295, 62-187092, 63- 67189, JP-A-1-244891, and the like. Further, “11290 Chemical Products”, Chemical Industry Daily, p. 286-p. 294, “UV / EB Curing Handbook (raw material)”, Kobunshi Publishing Co., p. The compounds described in 11 to 65 can also be suitably used in the present invention. Of these, compounds having two or more acrylic groups or methacryl groups in the molecule are preferred in the present invention, and those having a molecular weight of 10,000 or less, more preferably 5,000 or less are preferred.

  In the present invention, it is preferable to use an addition-polymerizable ethylenic double bond-containing monomer containing a tertiary amino group in the molecule. Although there is no particular limitation on the structure, a tertiary amine compound having a hydroxyl group modified with glycidyl methacrylate, methacrylic acid chloride, acrylic acid chloride or the like is preferably used. Specifically, collectable compounds described in JP-A-1-165613, JP-A-1-203413, and JP-A-1-197213 are preferably used.

  Furthermore, the present invention uses a reaction product of a polyhydric alcohol containing a tertiary amino group in the molecule, a diisocyanate compound, and a compound containing an ethylenic double bond capable of addition polymerization with a hydroxyl group in the molecule. Is preferred.

  Hereinafter, the present invention will be specifically described with reference to embodiments and examples, but the present invention is not limited thereto.

Embodiment 1
FIG. 2 is a cross-sectional view showing an example of a heating unit in the heating process of the present invention. 3 is a block diagram of the magnetic field generating means as viewed from the direction of arrow II in FIG. 2, and FIG. 3 is a view taken along the line III-III in FIG. FIG. FIG. 5 is a cross-sectional configuration diagram of the heat generating roller 21 of the present invention used in the heating process of FIG. Hereinafter, the fixing device and the heat generating roller according to the present embodiment will be described with reference to FIGS.

  In FIG. 4, the heat generating roller 21 includes a release layer 27, a thin elastic layer (second elastic layer) 26, and an induction heat generating layer (hereinafter simply referred to as “heat generating layer”) made of a thin conductive material. 22, an elastic layer 23 with good heat insulation, a magnetic layer 19 as a magnetic shield layer, and a core member 24 serving as a rotating shaft.

  FIG. 3 is a cross-sectional view taken along the line III-III in FIG. The heat generating roller 21 is rotatably supported on the side plates 29 and 29 ′ by bearings 28 and 28 ′ at both ends of the core material 24 which is the lowermost layer. The heat generating roller 21 is rotationally driven through a gear 30 that is integrally fixed to the core member 24 by a driving unit (not shown) of the apparatus main body. Reference numeral 36 denotes an exciting coil as a magnetic field generating means, which is arranged to face the cylindrical surface on the outer periphery of the heat generating roller 21 and is formed by winding a wire bundle in which 60 wires made of copper wires whose surfaces are insulated are bundled. .

  The wire bundle of the exciting coil 36 is arranged in an arc shape along the outer peripheral surface at the end of the cylindrical surface of the heating roller 21 in the direction of the central axis of rotation (not shown), and in the other portions the generatrix direction of the cylindrical surface Are arranged along. Further, as shown in FIG. 1 which is a cross-sectional view orthogonal to the rotation center axis of the heat generation roller 21, the flux of the exciting coil 36 is centered on the rotation center axis of the heat generation roller 21 so as to cover the cylindrical surface of the heat generation roller 21. They are arranged in close contact with each other on an imaginary cylindrical surface as an axis (except for the end of the heat roller).

  Further, as shown in FIG. 3 which is a cross-sectional view including the rotation center axis of the heat generating roller 21, the line bundles of the exciting coils 36 are stacked and stacked in two rows at a portion facing the end of the heat generating roller 21. Therefore, the exciting coil 36 is formed in a shape like a ridge as a whole. Here, the winding center axis 36a of the excitation coil 36 is a straight line that is substantially orthogonal to the rotation center axis of the heat generating roller 21 and passes through the approximate center point in the direction of the rotation center axis of the heat generation roller 21. It is formed substantially symmetrical with respect to the rotation center axis 36a. The wire bundles are adhered to each other by a surface adhesive, and the illustrated shape is maintained. The exciting coil 36 faces the outer peripheral surface of the heat generating roller 21 with an interval of about 2 mm. In the cross-sectional view of FIG. 2, the angle range in which the excitation coil 36 faces the outer peripheral surface of the heat roller 21 is a wide range of about 180 degrees with respect to the rotation center axis of the heat roller 21.

  Reference numeral 37 denotes a back core that constitutes a magnetic field generating means together with the excitation coil 36, a rod-shaped center core 38 that passes through the winding center axis 36a of the excitation coil 36 and is parallel to the rotation center axis of the heating roller 21, A substantially U-shaped U-shaped core 39 is provided on the side opposite to the heating roller 21 with respect to the exciting coil 36 and is spaced from the exciting coil 36. The central core 38 and the U-shaped core 39 are magnetically connected. As shown in FIG. 1, the U-shaped core 39 has a U shape that is substantially symmetrical with respect to a plane that includes the rotation center axis of the heat generating roller 21 and the winding center axis 36 a of the excitation coil 36. As shown in FIGS. 2 and 3, a plurality of such U-shaped cores 39 are arranged apart from each other in the direction of the rotation center axis of the heat generating roller 21. The U-shaped core 39 captures magnetic flux leaking from the exciting coil 3 to the outside.

  As shown in FIG. 2, both ends of each U-shaped core 39 are extended to a range that does not face the exciting coil 36, and a facing portion F that faces the heating roller 21 without the exciting coil 36 is formed. The central core 38 faces the heat roller 21 without the excitation coil 36, and protrudes toward the heat roller 21 from the U-shaped core 39 to form a facing portion N. The protruding opposed portion N of the central core 38 is inserted into a hollow portion at the winding center of the exciting coil 36.

  In this embodiment, ferrite is used as the material for the back core 37. The material of the back core 37 is preferably a material having high magnetic permeability and high specific resistance such as ferrite and permalloy, but any magnetic material can be used even if the magnetic permeability is somewhat low. Reference numeral 40 denotes a heat insulating member having a thickness of 1 mm and made of a resin having a high heat resistance such as PEEK (polyether ether ketone) or PPS (polyphenylene sulfide).

  In FIG. 2, a pressure roller 31 as a pressure member is formed by coating a surface of a metal shaft 32 with an elastic layer 33 made of silicone rubber. The elastic layer has a hardness of 50 degrees (JIS-A).

  In the nip portion 34, the elastic layer 23 of the heat generating roller 21 is compressed and deformed, and the heat generating layer 22 is pressed with a substantially uniform pressure in the width direction (in the direction of the rotation center axis of the heat generating roller 21). The material of the elastic layer 33 of the pressure roller 31 may be made of heat-resistant resin such as fluororubber or fluororesin, or heat-resistant rubber, in addition to the silicone rubber. In addition, the surface of the pressure roller 31 has a PFA (tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer), PTFE (tetrafluoroethylene), FEP (tetrafluoride) in order to improve wear resistance and releasability. A resin such as ethylene-hexafluoropropylene copolymer) or rubber may be coated alone or in a mixture. In order to prevent heat dissipation, the pressure roller 31 is preferably made of a material having low thermal conductivity. In FIG. 1, reference numeral 41 denotes a temperature detection sensor, which detects the temperature of the surface of the heat generating roller 21 immediately before reaching the nip portion 34 when it contacts the surface of the heat generating roller 21, and feeds it back to a control circuit (not shown). During operation, the surface temperature of the heating roller 21 immediately before the nip portion 34 is controlled to 170 degrees Celsius by adjusting the excitation power of the excitation circuit 42. In this embodiment, in order to achieve the purpose of shortening the warm-up time, the heat capacities of the heat generating layer 22 and the elastic layer 26 and the release layer 27 provided outside the heat generating layer 22 are set as small as possible.

  A high frequency current of 20 to 50 kHz is caused to flow through the excitation coil 36 by the excitation circuit 42 while rotating the heat generating roller 21 and the pressure roller 31 with the above configuration. As a result, alternating magnetic flux flows through the central core 38 surrounding the exciting coil 36, the U-shaped core 39 and the heat generating layer 22 of the heat generating roller 21 facing the exciting coil 36, and eddy current is generated in the heat generating layer 22 by this alternating magnetic flux. Then, the surface temperature of the heat generating roller 21 starts to rise rapidly. The surface temperature of the heat generating roller 21 is detected by the temperature detection sensor 41, and the temperature is adjusted to a predetermined 80 to 150 ° C. Then, the photosensitive lithographic printing plate material 11 subjected to image exposure is inserted into the nip portion 34, and the photosensitive lithographic printing plate material 11 is heated in the nip portion 34 and then conveyed to the development processing step. A water washing step may be provided between the heating step and the development processing step.

Next, the configuration of the heat generating roller 21 will be described in detail.
In this embodiment, the core member 24 is made of a non-magnetic stainless steel (SUS304), and a magnetic shield layer is formed on the surface thereof using a silicone rubber as a base material, and ferrite powder is dispersed in the insulating magnetic material having a thickness of about 500 μm. The body layer 19 is coated. The core member 24 is not limited to stainless steel, and aluminum or the like can also be used. The magnetic powder contained in the magnetic layer 19 is not limited to ferrite powder, and sendust powder or the like can be used.

  The elastic layer 23 is made of a low thermal conductive silicone rubber foam. A hardness of 20 to 55 degrees (ASKER-C) is desirable in order to ensure the width W of the nip portion 34 by having an appropriate elasticity and to reduce the diffusion of heat from the heat generating layer 22. In the case of not a foam, it is desirable from the viewpoint of heat resistance and flexibility to use a silicone rubber having a hardness of 50 degrees (JIS-A) or less.

  The heat generating layer 22 of the present example is formed by applying a silicone rubber as a base material and having a scaly nickel piece dispersed therein on the elastic layer 23 to a thickness of 60 μm. The alternating magnetic flux generated by the exciting coil 36 passes through the nickel piece in the heat generating layer 22 and passes through the heat generating layer 22, whereby an eddy current is generated in the nickel piece and the heat generating layer 22 is rapidly heated. In this embodiment, silicone rubber is used as the base material of the heat generating layer 22, but instead of this, a flexible heat-resistant resin or heat-resistant rubber such as polyimide resin, fluorine resin, or fluorine rubber may be used. it can. Further, the filler to be dispersed in the base material is not limited to the above-mentioned nickel piece, and magnetic metal powder or non-magnetic metal powder is used, and these are mixed or laminated to be dispersed in the base material. Also good. The shape of the powder may be any of a fiber shape, a spherical shape, a scale shape, and the like. Needless to say, the filler to be dispersed may be any material having conductivity in which an eddy current flows by an alternating magnetic flux. In this embodiment, nickel, which is a magnetic metal, is used as the filler. As a result, the alternating magnetic flux generated by the exciting coil 36 is guided into the heat generating layer 22, the magnetic resistance of the magnetic circuit that circulates around the exciting coil 36 is reduced, and the magnetic flux that leaks to the other layer through the heat generating layer 22 (leakage magnetic flux). Therefore, efficient heating is possible. The thickness of the heat generating layer 22 is preferably 10 to 200 μm.

  Embodiment 2. FIG.

  FIG. 6 is a cross-sectional view showing an example of a heating unit in the heating process of the second embodiment. In the present embodiment, members having the same functions as those of the heating device of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the present embodiment, the configuration of the magnetic field generating means including the exciting coil 36, the back core 37, and the heat insulating member 40, and the pressure roller 31 are the same as those in the first embodiment.

  In FIG. 6, a thin electromagnetic induction heating belt (hereinafter simply referred to as “heating belt”) 140 is an induction heating layer (hereinafter simply referred to as “heating layer”) having a thickness of 40 μm made of Ni by electroforming into a belt shape. Is an endless belt. The outer surface of the heat generating belt is covered with a release layer (not shown) made of a fluororesin and having a thickness of 20 μm in order to impart release properties. As the release layer, resins or rubbers having good release properties such as PTFE, PFA, FEP, silicone rubber, and fluorine rubber may be used alone or in combination. When the heat generating belt 140 is used for fixing a monochrome image, it is only necessary to ensure releasability. However, when the heat generating belt 140 is used for fixing a color image, it is desirable to provide elasticity. It is preferable to form a thicker elastic layer between the heat generating layer and the release layer. Reference numeral 150 denotes a supporting roller, and 160 denotes a low thermal conductivity nip roller whose surface is covered with silicone rubber which is a foam having low hardness (JISA 30 degrees) elasticity. The heat generating belt 140 is suspended with a predetermined tension between the support roller 150 and the nip roller 160, and rotates in the direction of the arrow 140a. At both ends of the support roller 150, ribs (not shown) for preventing the heat generating belt 140 from meandering are provided.

  The pressure roller 31 as a pressure member is pressed against the fixing roller 160 via the heat generating belt 140, thereby forming a nip portion 34 between the heat generating belt 140 and the pressure roller 31. . The support roller 150 includes an elastic layer (heat insulating layer) 153, a magnetic layer 152, and a core 151 from the outside. The core material 151 is made of a nonmagnetic stainless material. The magnetic layer 152 as a magnetic shield layer is an insulating layer having a thickness of about 500 μm coated with silicone rubber in which ferrite powder is dispersed. The elastic layer 153 is made of a foam of low thermal conductive silicone rubber. In this embodiment, the elastic layer 153 has a hardness of 45 degrees (ASKER-C). In order to reduce the diffusion of heat from the heat generating layer of the heat generating belt 140, it is also effective to reduce the contact area with the heat generating belt 140 by providing irregularities on the surface of the elastic layer 153.

  According to the present embodiment, the alternating magnetic flux from the magnetic field generating means generates an eddy current in the heat generating layer of the heat generating belt 140 and induces heat generation in the heat generating layer. The heat-generating belt 140 that has generated heat is conveyed to the development processing step after the photosensitive lithographic printing plate material 11 that has undergone image exposure at the nip portion 34 is heated.

  Of the alternating magnetic flux from the magnetic field generating means, most of the leakage magnetic flux that passes through the heat generating layer of the heat generating belt 140 and enters the support roller 150 is captured by the magnetic layer 152 formed on the outer surface of the core 151. Therefore, the amount of magnetic flux that enters the core 151 is significantly reduced. Further, the magnetic layer 152 does not generate heat due to the magnetic flux passing through the magnetic layer 152.

  Therefore, most of the alternating magnetic flux applied by the magnetic field generating means is consumed for the heat generation of the heat generating layer, and the heat generation efficiency is improved. Further, troubles such as heating and damage to the bearing of the core 151 can be eliminated.

  In addition, as the heat generating layer of the heat generating belt 140 of the present embodiment, the configuration described as the heat generating layer 22 of the heat generating roller 21 in the above-described first embodiment can be applied, and thus described in the first embodiment. The same effect as can be obtained.

  Further, as the core material 151, the magnetic shield layer, and the elastic layer 153 of the support roller 150 of the present embodiment, the core material 24, the magnetic shield layer, and the elastic layer 23 of the heating roller 21 have been described in the above-described first embodiment. The configuration can be applied, and thereby the same effect as described in the first embodiment can be obtained.

  Further, in the present embodiment, the heat generating belt 140 is provided with the heat generating layer and only the heat generating belt 140 is induced to generate heat. However, the structure may be similar in which both the heat generating belt 140 and the support roller 150 generate heat by induction. An effect is obtained.

  That is, an induction heat generation layer is provided on the surface layer of the support roller 150 or in the vicinity of the surface layer, and a magnetic shield layer is formed between the induction heat generation layer and the core material 151. For example, when the induction heat generating layer of the support roller 150 is formed of a thin pipe made of an iron-based alloy such as carbon steel, both the heat generating belt 140 and the support roller 150 are induction-heated.

  In this case, the warm-up time is slightly delayed due to the heat capacity of the support roller 150. However, when the recording material 11 having a width narrower than that of the heat generating belt 140 is continuously fed, only a part of the heat generating belt 140 is recorded. 11 is reduced by the heat transfer in the width direction via the support roller 150. In this case as well, since the magnetic shield layer is provided between the induction heating layer of the support roller 150 and the core material, the core material is prevented from generating heat.

  In the present embodiment, the support roller 150 does not contribute to the formation of the nip portion 34. Therefore, the elastic layer 153 can be omitted.

  That is, the magnetic layer 152 can be provided on the surface of the support roller 150. Thereby, simplification of the layer structure of the support roller 150 and cost reduction can be realized.

  Embodiment 3. FIG.

  FIG. 7 is a cross-sectional view showing an example of a heating unit in the heating process of the third embodiment. In the present embodiment, members having the same functions as those of the heating device of the first embodiment are denoted by the same reference numerals, and description thereof is omitted. In the present embodiment, the configuration of the magnetic field generating means including the exciting coil 36, the back core 37, and the heat insulating member 40, and the pressure roller 31 are the same as those in the first embodiment.

  The electromagnetic induction heat generating belt (hereinafter simply referred to as “heat generating belt”) 140 and the support roller 150 are the same as those in the fifth embodiment.

  In the present embodiment, the heat generating belt 140 is rotatably supported by the support roller 150 and the belt guide 170, and the support roller 150 is in pressure contact with the pressure roller 31 via the heat generating belt 140. This is different from the second embodiment. The belt guide 170 is made of a resin material having good slidability.

  According to the third embodiment, as in the second embodiment, the alternating magnetic flux from the magnetic field generating means generates an eddy current in the heat generating layer of the heat generating belt 140 and induces heat generation in the heat generating layer. The heat generating belt 140 that has generated heat heats the photosensitive lithographic printing plate material 11 at the nip portion 34, and is then conveyed to a development processing step.

  Of the alternating magnetic flux from the magnetic field generating means, the leakage magnetic flux penetrating through the heat generating layer of the heat generating belt 140 passes through the belt guide 170 and reaches the support roller 150. However, since most of the leakage magnetic flux that has entered the support roller 150 is captured by the magnetic layer 152 formed on the outer surface of the core material 151, the amount of magnetic flux that enters the core material 151 is greatly reduced. . Further, the magnetic layer 152 does not generate heat due to the magnetic flux passing through the magnetic layer 152.

  Therefore, most of the alternating magnetic flux applied by the magnetic field generating means is consumed for the heat generation of the heat generating layer, and the heat generation efficiency is improved. Further, troubles such as heating and damage to the bearing of the core 151 can be eliminated.

  As the heat generating layer of the heat generating belt 140 of the present embodiment, the configuration described as the heat generating layer 22 of the heat generating roller 21 in the above-described first to fourth embodiments can be applied. The same effect as described in 2 can be obtained.

In addition, as the core material 151, the magnetic shield layer, and the elastic layer 153 of the support roller 150 according to the present embodiment, the core material 24 of the heat generating roller 21 and the magnetic shield example A in the above-described first and second embodiments.
(Photopolymer plate material)
(Preparation of support 1)
An aluminum plate (material 1050, tempered H16) having a thickness of 0.3 mm was immersed in a 5% aqueous sodium hydroxide solution maintained at 65 ° C., degreased for 1 minute, and then washed with water. This degreased aluminum plate was neutralized by dipping in a 10% aqueous hydrochloric acid solution maintained at 25 ° C. for 1 minute, and then washed with water. Next, the aluminum plate was subjected to electrolytic surface roughening with an alternating current for 60 seconds under conditions of 25 ° C. and a current density of 100 A / dm ^{2 in} a 0.3% by mass nitric acid aqueous solution, and then kept at 60 ° C. Desmutting treatment was performed for 10 seconds in a 5% aqueous sodium hydroxide solution. The surface-roughened aluminum plate subjected to desmut treatment was anodized in a 15% sulfuric acid solution at 25 ° C., a current density of 10 A / dm ² , and a voltage of 15 V for 1 minute, and further 3 mass% polyvinylphosphonic acid. The support 1 was produced by performing a hydrophilization treatment at 75 ° C.

  At this time, the center line average roughness (Ra) of the surface was 0.65 μm.

Binder synthesis Acrylic resin (PA-1)
20.0% by weight 2-butanone in methacrylic acid / methyl methacrylate / ethyl methacrylate copolymer (15:30:55 methacrylic acid / methyl methacrylate / ethyl methacrylate mass ratio, Tg: 101 ° C., Solution containing acid value: 98 mg KOH / g, molecular weight (Mw): 35,000) (Preparation of photosensitive lithographic printing plate material 1)
On the support 1, the photopolymerized photosensitive layer coating solution shown in Table 1 below was applied with a wire bar so that the dry coating liquid was 1.6 g / m ² , dried at 90 ° C. for 2 minutes, and then the photosensitive layer An oxygen barrier layer coating solution having the following composition is applied on the top with an applicator so as to be 1.8 g / m ² when dried, and dried at 75 ° C. for 1.5 minutes to form an oxygen barrier layer on the photosensitive layer. A photosensitive lithographic printing plate sample 1 was prepared.

  (Photopolymerizable photosensitive layer coating solution 1)

(Oxygen barrier layer coating solution 1)
Polyvinyl alcohol (AL-06: manufactured by Nippon Synthetic Chemical Co., Ltd.) 89.5 parts Polyvinylpyrrolidone (Rubitec K-30: manufactured by BASF Corp.) 10.0 parts Surfactant (Surfinol 465: manufactured by Nissin Chemical Industry Co., Ltd.) 5 parts Water 900 parts (Exposure)
The produced photosensitive lithographic printing plate material 1 was prepared using a plate setter (MAKO4: manufactured by ECRM) equipped with a light source having a laser of 405 ± 5 nm and 60 mW, exposure energy: 50 μJ / cm ² , 2400 dpi (dpi and Image exposure (exposure pattern is 175 LPI calibrated 50% halftone dot) at a resolution of 2.54 cm.

  Next, a heating step for heating the plate surface to 80 to 150 ° C., a pre-water washing step for removing the oxygen blocking layer before development, a development step filled with a developer having the following composition, and a developer adhering to the plate surface are removed. An automatic developing machine lithographic printing plate for CTP provided with a gum solution (GW-3: manufactured by Mitsubishi Chemical Co., Ltd., diluted 2-fold) for protecting the washing section and the image area was obtained. The target plate surface temperature during plate making is 110 ° C. The time during which the photosensitive lithographic printing plate was in contact with the developer was defined as the development time, and the development time using the automatic developing machine was 25 seconds.

  Developer 1 having the following composition was prepared.

Developer D. R. -1 (1000ml aqueous solution formulation)
The following compound P-1 3.0 mass%
Chelating agent (Dissolvin Na2-S manufactured by Akzo Novell) 0.5% by mass
Potassium hydroxide Addition amount at the following pH The remaining components are water pH: 12.1

Example 1
Heat treatment is performed using the function described in Embodiment Mode 1.

Example 2
Heat treatment is performed using the function described in Embodiment Mode 2.

Example 3
Heat treatment is performed using the function described in Embodiment Mode 3.

Comparative Example 1
Heat treatment is performed using the form of Japanese Patent Laid-Open No. 4-230760.

Evaluation The time from when the automatic developing machine was turned on until the heating process was heated and the plate surface temperature reached a predetermined temperature was measured.

  The image area ratio of 50% halftone dots was measured with Xrite dot (manufactured by Xrite) at 10 points with a size of 510 mm × 600 mm, and the average value, maximum value, and minimum value were measured.

Example B
(Thermal negative plate material)
(Preparation of support 2)
An aluminum plate (material 1050, tempered H16) having a thickness of 0.3 mm was immersed in a 5% aqueous sodium hydroxide solution maintained at 65 ° C., degreased for 1 minute, and then washed with water. This degreased aluminum plate was neutralized by dipping in a 10% aqueous hydrochloric acid solution maintained at 25 ° C. for 1 minute, and then washed with water. Next, the aluminum plate was subjected to electrolytic surface roughening with an alternating current for 60 seconds under conditions of 25 ° C. and a current density of 100 A / dm ^{2 in} a 0.3% by mass nitric acid aqueous solution, and then kept at 60 ° C. Desmutting treatment was performed for 10 seconds in a 5% aqueous sodium hydroxide solution. The roughened aluminum plate subjected to desmut treatment was anodized in a 15% sulfuric acid solution at 25 ° C., a current density of 10 A / dm ² , and a voltage of 15 V for 1 minute. In order to ensure hydrophilicity as a part, silicate treatment was performed. In the treatment, a 1.5% aqueous solution of sodium silicate 3 was kept at 70 ° C. so that the contact time of the aluminum web was 15 seconds, and further washed with water. The adhesion amount of Si was 10 mg / m ² . A support 2 was prepared. At this time, the center line average roughness (Ra) of the surface was 0.65 μm.

[undercoat]
Next, the following undercoat liquid was applied to this aluminum support with a wire bar, and dried at 90 ° C. for 30 seconds using a hot air drying apparatus. Clothing amount after drying was 10 mg / m ^2.

<Undercoat liquid>
0.1 g of a copolymer of ethyl methacrylate and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt in a molar ratio of 75:15
2-Aminoethylphosphonic acid 0.1g
50g of methanol
Ion exchange water 50g
[Photosensitive layer]
Next, the following photosensitive layer coating solution [R] is prepared. Immediately after preparing this solution, it is applied to the above-mentioned undercoated aluminum plate using a wire bar, and heated at 115 ° C. for 45 seconds with a hot air dryer. By drying, a negative lithographic printing plate precursor [R-1] was obtained. The coating amount after drying was 1.3 g / m ² . Infrared absorbers and radical generators used at this time are shown in Table 10. When the reflection density at the absorption maximum in the infrared region of the photosensitive layer of these lithographic printing plate precursors was measured, all were between 0.6 and 1.2.

<Solution [R]>
Infrared absorber (D-2) 0.10 g
Radical generator (I-2) 0.30g
Multifunctional monomer (M-2) 1.00 g
Addition polymer of 4,4′-diphenylmethane diisocyanate, hexamethylene diisocyanate, tetraethylene glycol and 2,2-bis (hydroxymethyl) propionic acid in a molar ratio of 30: 20: 30: 20 (weight average molecular weight 60,000) 00g
Victoria Pure Blue Naphthalenesulfonate 0.04g
Fluorine-based surfactant 0.01g
(Megafuck F-176, manufactured by Dainippon Ink & Chemicals, Inc.)
Methyl ethyl ketone 5.0g
Methanol 10.0g

1-methoxy-2-propanol 8.0g
Methyl lactate 2.0g
γ-butyrolactone 2.0g
[exposure]
The produced negative lithographic printing plate precursor [R-1] was output at 9 W, outer drum rotational speed 210 rpm, plate surface energy 100 mJ / cm ² , 2400 dpi (dpi) using a Trend setter 3244VFS manufactured by Creo equipped with a water-cooled 40 W infrared semiconductor laser. Image exposure (the exposure pattern is a 175 LPI calibrated 50% halftone dot) with a resolution of 2.54 cm. Next, a heating step for heating the plate surface temperature to 80 to 150 ° C., a development step filled with the developer 1, a water washing portion for removing the developer attached to the plate surface, a gum solution (GW) for protecting the image area -3: a product obtained by diluting Mitsubishi Chemical Co., Ltd. twice) to obtain a lithographic printing plate. The target plate surface temperature during plate making is 110 ° C. The time during which the photosensitive lithographic printing plate was in contact with the developer was defined as the development time, and the development time using the automatic developing machine was 25 seconds.

Example 4
Example 5 in which heat treatment is performed using the function described in Embodiment 1
Example 6 in which heat treatment is performed using the function described in Embodiment 2.
Comparative Example 2 in which heat treatment is performed using the function described in Embodiment 3
Heat treatment is performed using the form of Japanese Patent Laid-Open No. 4-230760.

It is sectional drawing which shows an example of the heating part using an electromagnetic induction heating system. 3 is a cross-sectional view illustrating an example of a heating unit in the heating process of Embodiment 1. FIG. It is a block diagram of the magnetic field generation means seen from the arrow II direction of FIG. FIG. 4 is a cross-sectional view taken along the line III-III in FIG. 2 is a cross-sectional configuration diagram of a heat generating roller 21 of the present invention used in the heating step of Embodiment 1. FIG. FIG. 6 is a cross-sectional view illustrating an example of a heating unit in a heating process according to a second embodiment. FIG. 9 is a cross-sectional view showing an example of a heating unit in a heating process according to a third embodiment.

Explanation of symbols

21 Heating roller 22 Heating layer

Claims (2)

A photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on a support is imagewise exposed and then heated to 80 to 150 ° C. using an electromagnetic induction heating method during development processing. A process for making a photosensitive lithographic printing plate. After the photosensitive lithographic printing plate material having a radiation-sensitive photosensitive layer on the support is imagewise exposed, in an automatic processor having a developing step, a post-processing step, and a drying step, the post-processing step is performed after the exposure. An automatic processor characterized by having a heating step for heating the photosensitive lithographic printing plate material, and the heating means in the heating step uses an electromagnetic induction heating method.

Images