JP2003300388A - Lithographic printing plate material, method for manufacture thereof, and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost lithographic printing plate material which is free from a conveyance flaw and a conveyance failure during a conveying operation and almost free from an image defect, a method for manufacturing the material, and a printing method using the material. <P>SOLUTION: In the method for manufacturing the lithographic printing plate material having at least an imaging layer on a base material, a step to adjust a first top face layer on the side where the imaging layer is present so that the first top face layer contains a lubricating component and a step to take up the material in a roll shape are sequentially formed on the base material. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a lithographic printing plate material, a method for producing the lithographic printing plate material, and a printing method using the same.

[0002]

2. Description of the Related Art With the spread of computers and digital technology, a computer-to-plate technology (CTP) for directly drawing on a planographic printing plate material based on electronic image data has become popular in the process of making a planographic printing plate. It's starting. This has made it possible to simplify the workflow and reduce the cost for film production.

Further, in recent years, the office of the printing environment has been developed in synchronism with the spread of CTP, and the demand for space saving in the office is also increasing. Printing machines such as the TruePress system of Dainippon Screen Mfg. Co., Ltd. and the Quickmaster 46DI system of Heidelberg PMT have an exposure device inside the printing machine and do not require an offline platesetter. It contributes to space saving in the office (for example, refer to Patent Document 1).

The planographic printing plate materials used in these printing machines all have a plastic film support, and these planographic printing materials are installed in advance in the printing machine by being guided from a roll-shaped sheet by a conveying member such as a guide roll. However, the transport member sometimes adversely affects the printing original plate. Specifically, these transport members often rub the surface of the printing original plate to generate transport scratches, often causing image defects in the printed matter.

The Quickmaster 46DI system is a system in which a pearl dry plate manufactured by Prestec Co., Ltd. is used as a lithographic printing plate material. The pearl dry plate has a lipophilic layer / photothermal conversion layer / silicone rubber layer on a substrate. It has a form in which layers are sequentially laminated, and there is a problem in that if the silicone layer is damaged, that portion becomes scumming.

The TruePress system is a system that uses a silver digit plate manufactured by Mitsubishi Paper Mills, Ltd. as a lithographic printing plate material. In this system, a jam may occur during the transportation of the lithographic printing plate material. , The printing machine must be stopped, the planographic printing plate material must be discharged and the planographic printing plate material must be set again.
The printing yield is greatly deteriorated.

In order to reduce the conveyance jam, it is conceivable to apply a back coat layer on the back side of the film to reduce friction, but the number of steps is increased to prepare the planographic printing plate material,
There is a problem that the cost of the planographic printing plate material becomes high.

[0008]

[Patent Document 1] Japanese Unexamined Patent Publication No. 10-272756

[0009]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lithographic printing plate material which is free from transport scratches and transport defects during transport, has few image defects, and is low in cost, and a method for producing the same, It is to provide a printing method using a printing plate material.

[0010]

The above objects of the present invention have been achieved by the following constitutions 1 to 13.

1. In the method for producing a lithographic printing plate material having at least an image forming layer on a substrate, the step of adjusting the first outermost surface layer on the side having the image forming layer on the substrate to contain a lubricating component A method for producing a lithographic printing plate material, comprising the steps of sequentially winding in a roll form.

2. 1. The method as described above, further comprising a step of wrapping with a wrapping material after the step of winding into a roll.
The method for producing a lithographic printing plate material as described in.

3. 3. The method for producing a lithographic printing plate material as described in 1 or 2 above, wherein the lithographic printing plate material is in a roll shape.

4. In a lithographic printing plate material having at least an image forming layer on a substrate, a step of adjusting the first outermost surface layer on the side having the image forming layer of the substrate to contain a lubricating component, and then a roll A planographic printing plate material, which is manufactured through a process of winding into a shape.

5. 5. The lithographic printing plate material as described in 4 above, which is produced through a step of packaging with a packaging material after the step of winding into a roll.

6. 6. The lithographic printing plate material as described in 4 or 5 above, wherein the lubricating component is in the form of particles.

7. Any one of the above 4 to 6, wherein the first outermost layer is an image forming layer, and the lubricating component is a lipophilic thermoplastic or thermofusible particle.
The planographic printing plate material as described in the above item.

8. 8. The lithographic printing plate material as described in any one of 4 to 7 above, wherein a hydrophilic layer is provided between the substrate and the image forming layer.

9. 9. The lithographic printing plate material as described in any one of 4 to 8 above, wherein the base material is made of plastic.

10. The coefficient of static friction of the first outermost surface layer before the step of winding into a roll is 0.05 or more and 2.0 or more.
And the static friction coefficient of the second outermost surface layer on the side opposite to the first outermost surface layer after the step of winding into a roll is both 0.05 or more and less than 2.0. Four
10. The lithographic printing plate material as described in any one of 9 to 10.

11. The coefficient of static friction of the first outermost surface layer before the step of winding into a roll is 0.05 or more and 2.0 or more.
Less than, the coefficient of static friction of the second outermost surface layer is 2.0 or more and 5.0 or less, and the static friction of the first outermost surface layer and the second outermost surface layer after the step of winding into a roll. 11. The lithographic printing plate material as described in 10 above, wherein the coefficients are both 0.05 or more and less than 2.0.

12. 12. The lithographic printing plate material as described in any one of 4 to 11 above, which has a roll shape.

13. The planographic printing plate material A manufactured by the manufacturing method according to any one of 1 to 3 above, or
13. The planographic printing plate material B according to any one of 4 to 12 above.
To the planographic printing plate material A or the planographic printing plate material A on which the image recording is performed by supplying dampening water and ink to the planographic printing plate material A. A printing method comprising: a step of forming an ink image on or on the planographic printing plate material B; and a step of transferring the formed ink image to a sheet-shaped substrate.

The present invention will be described in detail below. The present invention has been devised in view of the above problems, and as a result of various investigations by the present inventors, in a lithographic printing plate material having at least an image forming layer on a substrate, the image forming on the substrate was performed. The step of preparing the first outermost layer on the side having the layer so as to contain a lubricating component, and the planographic printing plate material produced through the step of winding into a roll is less likely to cause a conveyance jam,
It has also been found that it is possible to provide a printed matter in which the influence on the printed matter due to the scratches that may occur during transportation is significantly reduced. That is, a lithographic printing plate material having a first outermost surface layer containing a lubricating component on the side of the lithographic printing plate material coated with the image forming layer is once wound into a roll, and the lubricating component is added to the other side. By sufficiently migrating to the second outermost surface layer, the friction of the outermost surface layer on both the front and back sides was reduced, the transportability was improved, and troubles such as transport scratches were less likely to occur.

<< Lubricating Component >> The lubricating component according to the present invention will be described.

As the lubricating component contained in the first outermost surface layer on the side having the image forming layer on the substrate, known components can be used, and waxes such as fatty acids, fatty acid esters and fatty acid amides, polyethylene glycols, (Modified) silicone resin, (modified) silicone oil, fluorine compound,
Carbon fluoride etc. can be mentioned.

Examples of the waxes include carnauba wax, beeswax, whale wax, wood wax, jojoba oil, lanolin, ozokerite, paraffin wax, montan wax, candelin 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, stearic acid, stearic acid amide and the like.

Examples of the silicone-modified resin include a thermoplastic resin and a synthetic rubber in which a part of a synthetic rubber is modified with a polysiloxane chain. The modified resin includes an acrylic resin, a styrene-acrylic resin, and a polyester. Kind,
Polyurethanes, polyethers, polyethylene, polypropylene, polystyrene, ionomer resins, vinyl acetate resins, vinyl chloride resins and the like can be mentioned. Examples of the synthetic rubbers that are also modified are polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer, acrylic ester-butadiene copolymer, methacrylic acid ester-butadiene copolymer, isobutylene-isoprene copolymer, Examples thereof include acrylonitrile-butadiene copolymer, acrylonitrile-isoprene copolymer, and styrene-isoprene copolymer.

Examples of the modified silicone oil include amino group-modified, epoxy-modified, carboxyl group-modified, phenol-modified, polyether-modified and higher alkoxy-modified silicone oils.

Examples of the fluorine-based compound include a fluorine-based surfactant: a fluoroaliphatic group-containing acrylate, methacrylate and (polyoxyalkylene) acrylate or (polyoxyalkylene) methacrylate copolymer, JP-A-62-170950. Japanese Patent Laid-Open No. Sho 62
-226143, U.S. Pat. No. 3,787,351.
And the like described in the specification and the like. Further, fluorine-containing acrylic resins described in JP-A-64-18142, fluorine-containing surfactants described in JP-B-6-105351, JP-A-8-3630 and JP-A-3-172849, Kaihei 1-256055 and 1-27
The compounds described in Japanese Patent Nos. 1478 and 4-63802 can be preferably used.

(Lubricating component in particle form) In the present invention, the lubricating component is preferably in particle form, and because of the particle form, it is detached from the first outermost surface layer and the second outermost layer on the opposite side is overlapped. It is easy to transfer to the surface layer, and the particle-like one has a remarkable decrease in frictional force when transferred. Among the above-mentioned lubricating components, those which are solid at room temperature are advantageous for forming a particle shape, and waxes, modified silicone resins and the like can be used.

This is a method of forming the lubricating component into a particle shape, but it can be achieved by emulsifying the above material.
As a method for preparing an emulsion, a known method can be used,
For example, the method described in “Distribution Technology Comprehensive Material Collection” (Business Development Center Publishing Department) and the like can be used.

It is preferable that the particle diameter of the lubricating component in the form of particles is adjusted so as to be exposed from the first outermost surface, and the insufficient exposure from the outermost surface is prevented, and
The average particle size of the particles is preferably in the range of 0.1 μm to 2.0 μm from the viewpoint of maintaining good printing performance (image durability, sensitivity, etc.) other than the effects of reducing the transport jam and the transport scratches.

Effects of the present invention (reduction of conveyance jam,
The amount of the lubricating component present in the first outermost surface layer of the lithographic printing plate material of the present invention is preferably in the range of 0.05 g to 2.0 g per 1 m ² from the viewpoint of preferably obtaining the effect of reducing transport scratches). . If it is less than 0.05 g, the migration of the lubricating component will be insufficient, and if it exceeds 2.00 g, the printing performance after storage may deteriorate. Further, the lubricity component in the particle shape of the first outermost surface layer is preferably 10% by mass to 100% by mass in all the components of the first outermost surface layer.

The static friction coefficient of the first outermost surface layer containing the lubricating component is preferably 0.05 or more and less than 2.0, and the static friction coefficient of the second outermost surface layer on the opposite side is the lithographic plate. After winding the printing plate precursor in a roll shape, it is lower than before winding, and further, the static friction coefficient of either outermost layer after the roll winding step is 0.05 or more and 2.0 or less. It is preferable.

By securing such a coefficient of static friction, it is possible to reduce jams during transportation and effectively prevent deterioration of printed matter due to transport scratches.

The static friction coefficient according to the present invention is measured by JI
It can be measured according to the friction coefficient test method specified in SK 7125. However, the environment under the measurement conditions is 25 ℃,
Adjusted to 65% RH.

<Image Forming Layer> The image forming layer according to the present invention will be described.

The image-forming layer according to the present invention preferably contains lipophilic thermoplastic or heat-meltable particles as a main component. Having the lipophilic property and forming a particle shape is advantageous for carrying out the printing method of claim 8 of the present invention. That is, the portion where the image is drawn by the laser light source is melted and fixed on the substrate, and the other portion is removed by the ink and the dampening water on the printing machine, so that the plate making can be performed without using a processor such as an automatic processor. It will be possible.

Examples of the material constituting the above-mentioned lipophilic thermoplastic or heat-meltable particles include thermoplastic resins, synthetic rubbers and waxes.

As the thermoplastic resin, an acrylic resin,
Examples thereof include styrene-acrylic resins, polyesters, polyurethanes, polyethers, polyethylene, polypropylene, polystyrene, ionomer resins, vinyl acetate resins, and vinyl chloride resins.

The synthetic rubbers include polybutadiene, polyisoprene, polychloroprene, styrene-butadiene copolymer, acrylic ester-butadiene copolymer, methacrylic acid ester-butadiene copolymer, isobutylene-isoprene copolymer, acrylonitrile. -Butadiene copolymer, acrylonitrile-isoprene copolymer, styrene-isoprene copolymer are mentioned.

The above-mentioned thermoplastic resin or synthetic rubber has a melting point or softening point of 60 ° C. or higher, and when it is formed into a film, its contact angle with water is 50 °.
The above is advantageous in terms of image SN and sensitivity.

As waxes, natural waxes such as carnauba wax, beeswax, whale wax, wood wax, jojoba oil, lanolin, ozokerite, paraffin wax, montan wax, candelin wax, ceresin wax, microcrystalline wax and rice wax. ,
Examples thereof include polyethylene wax, Fischer-Tropsch wax, montan wax derivative, paraffin wax derivative, microcrystalline wax derivative, and higher fatty acid. Among these, the melting point is 50 ℃ ~ 150
Melt viscosity at 140 ° C in the range of 0 ° C is 0.02 Pa
/ S or less is preferable. It is preferable in terms of image SN and sensitivity. Further, it is preferable in terms of printing durability that the needle penetration defined by JIS K2530-1976 is 1 or less.

Carnauba wax, candelilla wax, FT wax and the like are preferable as the heat-melting substance satisfying the above various characteristics.

In the present invention, contained in the image forming layer,
The average particle size of the thermoplastic or heat-meltable particles is 0.1 μm
It is preferably 0.5 μm. These physical properties are important for obtaining good printing durability. The content of the lipophilic heat-meltable particles contained in the image forming layer is preferably 40% by mass to 100% by mass.

In the present invention, the first outermost surface layer may be an image forming layer, and in this case, the lubricating component may play the role of lipophilic thermoplastic or heat melting particles. Waxes, especially carnauba wax, are preferable as those having both a lubricating component and lipophilic thermoplastic or heat-melting particles and good image SN.

The image-forming layer according to the present invention may contain a water-soluble resin as a fusion preventing agent for thermoplastic or heat-meltable particles during storage at room temperature. Water-soluble resins that can be used include water-soluble (co) polymers such as synthetic homo- or copolymers such as polyvinyl alcohol,
Poly (meth) acrylic acid, poly (meth) acrylamide, polyhydroxyethyl (meth) acrylate, polyvinyl methyl ether, or natural binders such as gelatin, polysaccharides such as dextran, pullulan, cellulose, gum arabic, arginine acid, polyethylene Known compounds such as glycol and polyethylene oxide can be used, but oligosaccharides are preferable in terms of ensuring printing durability while maintaining prevention of fusion of thermoplastic or heat-meltable particles in the unexposed area. Oligosaccharides are dehydrated and condensed from several monosaccharides by glycosidic bonds. Among them, in the present invention, trehalose, maltose, lactose,
Sucrose and the like are particularly preferable. The content of the water-soluble resin contained in the image forming layer is preferably 0% by mass to 50% by mass.

From the viewpoint of imparting sufficient printing durability to the image forming layer according to the present invention, it is preferable to adjust the amount of the image forming layer to be in the range of 0.1 g to 1.0 g per 1 m ² .

<< Substrate >> The substrate according to the present invention will be described.

The substrate according to the present invention is preferable in that the step of winding the plastic substrate into a roll can be carried out smoothly and the planographic printing plate material can be easily stored in a roll.

As the usable plastics, polyethylene terephthalate, polyethylene naphthalate, polyimide, polyamide, polycarbonate, polysulfone, polyphenylene oxide, cellulose esters and the like are preferable, and among them, polyethylene terephthalate and polyethylene naphthalate are particularly preferable. Further, the substrate according to the present invention may be subjected to corona discharge treatment or plasma discharge treatment in order to improve the adhesiveness of the hydrophilic layer or the easily-adhesive layer of the hydrophilic layer described later.

In the present invention, the base material may be the second outermost surface layer on the side opposite to the first outermost surface layer on the side having the image forming layer. And <hydrophilic layer> which is preferable in terms of low cost The hydrophilic layer according to the present invention will be described.

In the present invention, a hydrophilic layer can be provided between the image forming layer and the base material. Examples of the hydrophilic layer of the present invention include those composed of a hydrophilic resin, fine particles capable of self-forming a film, and inorganic fine particles.

As usable hydrophilic resins, polyvinyl alcohol, acrylic copolymers, polyurethanes,
Examples include cellulose derivatives. The polyvinyl alcohol preferably has a saponification degree of 95% or more.
Further, those partially modified with a carboxyl group can also be used. As the acrylic copolymer, those obtained by synthesizing a monomer having a highly hydrophilic functional group at a high content rate can be used, and as the highly hydrophilic monomer, acrylamide,
Examples thereof include methylol acrylamide, methylol methacrylamide, acrylic acid, methacrylic acid, hydroxyethyl acrylate, hydroxyethyl methacrylate, ammonium, a monomer containing a phosphonium salt, a sulfonic acid group, a phosphonic acid group, and a phosphoric acid group-containing monomer.

It is also possible to use a salt obtained by polymerizing the hydrophilic functional group of the polymer after copolymerization. As the polyurethanes, those having a hydrophilic functional group such as a carboxyl group, a phosphoric acid group, a sulfonic acid group, an amino group or a salt thereof, a hydroxyl group, an amide group and a polyoxyethylene group in its side chain can be used. Examples of the cellulose derivative include hydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, hydroxypropyl cellulose and the like.

Alumina sol and colloidal silica are mentioned as usable self-forming film-forming fine particles, and colloidal silica having a particle diameter of 50 nm or less is particularly preferable from the viewpoint of strength of hydrophilic layer coating and ensuring hydrophilicity. Specifically, the "Snowtex" series manufactured by Nissan Chemical Industries, Ltd. can be used. Necklace-shaped colloidal silica can also be used in order to achieve both appropriate coating strength and water retention. Necklace-shaped colloidal silica is a general term for an aqueous dispersion system of a continuous body of spherical silica having a primary particle diameter of the order of nm. Specific examples of the necklace-shaped colloidal silica include "Snowtex-PS" series manufactured by Nissan Chemical Industries, Ltd. As the alkaline product name of the series, "Snowtex-PS
-S (average particle size of linked state is about 110 nm), "Snowtex-PS-M (average particle size of linked state is about 120 nm)" and "Snowtex-PS-L (average of linked state)" The particle size is about 170 nm) ", and the corresponding acidic products are" Snowtex-PS-SO "," Snowtex-PS-MO "and" Snowtex-PS-L- ".
O ”.

The term "self-forming film" as used herein refers to a coating film which is applied so that the dry film thickness is about 1.0 μm and dried at 100 ° C. for 3 minutes, and the coating film is immersed in water for 10 minutes. After immersion, a film that does not cause defects in the coating film even if it is rubbed with a sponge is considered to have undergone self-coating.

The hydrophilic resin and the fine particles capable of forming a film may be used in combination. Examples of the inorganic fine particles that can be used in the hydrophilic layer include calcium carbonate, barium sulfate, silica, titanium oxide, clay, alumina, etc., but mechanical strength improvement and hydrophilicity, water retention improvement and desensitizing treatment described later are effective. Silica, alumina, titanium oxide, and zinc oxide are preferable from the viewpoint of exhibiting the above. The average particle size of the inorganic particles is preferably 0.01 μm to 10 μm, and more preferably 0.05 μm to 5 μm.

The above-mentioned hydrophilic resin or fine particles capable of self-forming and the inorganic fine particles have a mass ratio of 2 to 50:10.
It is preferably 50 in order to secure the mechanical strength and water retention of the hydrophilic layer and to secure the surface irregularities for image durability (hereinafter referred to as image printing durability).

A cross-linking structure may be imparted to the hydrophilic layer according to the present invention by using a cross-linking agent for the purpose of ensuring further mechanical strength. As the crosslinking agent, formaldehyde, epoxy resin, melamine resin, glyoxal, polyisocyanate, hydrolyzed tetraalkyl orthosilicate, etc. can be used. In the present invention, the content ratio of the crosslinking agent in the hydrophilic layer is preferably 0 to 1% by mass. The coating amount per 1 m ^{2 of the} hydrophilic layer is preferably 0.5 g to 10 g, more preferably 1.0 g to 5 g.

<< Photothermal Conversion Agent >> The photothermal conversion agent according to the present invention will be described.

In the image forming layer or the hydrophilic layer according to the present invention, a photothermal conversion agent which absorbs laser light and generates heat can be used.

The photothermal conversion agent is preferably a material that efficiently absorbs light and converts it into heat, and it varies depending on the light source used. For example, when a semiconductor laser emitting near infrared light is used as a light source, Near-infrared light absorber having an absorption band is preferable, for example, carbon black, cyanine dyes, polymethine dyes, azurenium dyes, squarylium dyes, thiopyrylium dyes, naphthoquinone dyes, organic compounds such as anthraquinone dyes, Phthalocyanine-based, azo-based, thioamide-based organometallic complexes, C
Metals such as o, Cr, Fe, Mn, Ni, Cu and Ti and oxides, nitrides or oxynitrides thereof are preferably used. In the present invention, the content ratio of the photothermal conversion agent in the image forming layer or the hydrophilic layer is 3% by mass to 20%.
It is preferably mass%.

Further, as the photothermal conversion agent, specifically,
JP-A-63-139191 and 64-33547.
No. 1,160,683, and No. 1-280.
750, 1-293342, and 2-20.
No. 74, No. 3-26593, No. 3-3099.
No. 1, JP-A-34891, JP-A No. 3-36093.
Examples thereof include compounds described in JP-A Nos. 3-36094, 3-36095, 3-42281, 3-97589, and 3-103476. These can be used alone or in combination of two or more.

<< Method for Producing Lithographic Printing Plate Material >> The method for producing the lithographic printing plate of the present invention will be described.

The lithographic printing plate material of the present invention is produced by sequentially coating and drying the hydrophilic layer, the image forming layer and the first outermost surface using a known coating method. As applicable coating methods, extrusion coater coating, curtain coater coating, wire bar coating, gravure coating, slide coater coating and the like can be applied.

In the present invention, the lithographic printing plate material is wound into a roll after coating the first outermost layer containing the lubricating component (or the image forming layer when the image forming layer contains the lubricating component). Taken. By using as a lithographic printing plate material after winding, the conveyance jam can be reduced and the printing yield is improved without intentionally providing a back coat layer or the like.

In the present invention, in order to stably adjust the values of the static friction coefficients of the first outermost surface layer and the second outermost surface layer as described in claims 6 and 7, the planographic printing plate material is a roll. After being wound into a shape, it is preferable to maintain the roll shape until immediately before plate making. Furthermore, it is preferable that the material is wound into a roll and then wrapped with a packaging material in order to stably obtain the relationships of claims 6 and 7 without being affected by environmental changes.

Further, the method of winding in a roll,
For example, in the production line, the tension applied to the substrate is 5
0kg / mm ² ~500kg / while adjusting to be in the range of mm ² wound with a winder process as an example.

The moisture permeability (JIS K
7129-1992; measurement conditions are a test temperature of 40 ° C.,
Those having a low relative humidity of 90% RH) are preferable, and specifically, those having a relative humidity of 15 g / atm · m ² · 25 ° C. · day or less are preferable.

(Packaging Material) As the packaging material used in the present invention, polyethylene resin, nylon resin, polypropylene resin, polyethylene terephthalate resin, polyamide resin, ethylene-vinyl alcohol copolymer resin, ethylene-acetic acid. Vinyl copolymer resin,
Examples thereof include acrylonitrile-butadiene copolymer resin, cellophane resin, vinylon resin, vinylidene chloride resin, and composite materials obtained by laminating them.

Further, for example, aluminum foil or aluminum vapor-deposited synthetic resin is used between the above synthetic resin films,
Various gas barrier films may be used.

The total thickness of these laminated films or single layers is 1 μm to 3000 μm, more preferably 10 μm to
2000 μm, more preferably 50 μm to 1000 μm
Is preferred.

<< Plate-making method of lithographic printing plate material >> A method of using the lithographic printing plate material according to the present invention including a plate-making method will be described.

The lithographic printing plate material of the present invention is once wound into a roll, and if it is further wrapped with a packaging material, the packaging material is removed before the plate making, and the lithographic printing plate material is unwound and exposed. To do. For exposure of the lithographic printing plate material wound into a roll, a laser light source corresponding to the absorption wavelength of the photothermal conversion agent contained in the hydrophilic layer or the image forming layer can be used, and Ar ion laser, Kr ion laser, He -Ne laser, He-Cd laser, ruby laser, glass laser, titanium sapphire laser, dye laser, nitrogen laser, metal vapor laser,
It is selected from excimer laser, semiconductor laser, YAG laser and the like.

As the laser scanning method, any of the cylindrical outer surface scanning, the cylindrical inner surface scanning and the flat surface scanning can be used.

<< Printing Method >> The printing method of the present invention will be described.

The lithographic printing plate material that has been subjected to laser exposure can be installed in a general printing press plate cylinder without passing through a processor such as an automatic processor. While rotating the plate cylinder, dampening water is supplied from the water supply roller of the printing machine, and printing ink is supplied from the ink roller to form an ink image on the plate surface, thereby performing plate making. In the planographic printing plate material of the invention, 10
It is preferable to supply dampening water for about 2 seconds and then supply ink to make a plate, because stains are less likely to occur at the initial stage of printing. Subsequently, printing paper is fed and printing is performed while supplying dampening water and ink to the planographic printing material.

Further, it is also possible to use a direct imaging printing machine which has become widespread in recent years and continuously perform plate making and printing on the printing machine.

As the direct imaging printing machine, the one described in JP-A-5-77385 can be used. In this case, the planographic printing plate material is unrolled from the roll state, cut into a size suitable for the plate cylinder, and then placed on the plate cylinder.

Further, Japanese Patent Laid-Open No. 10-272756,
JP-A-2002-225411, 2002-30
The printing machine described in Japanese Patent No. 7852 can be used, and in this case, the planographic printing plate material can be installed in the printing machine in a roll form.

[0083]

EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited thereto.

Example 1 << Production of planographic printing plate material >> A planographic printing plate material was produced according to the method described below.

<< Coating of undercoat layer >> 188 μm thick, length 1
After performing a corona discharge treatment on a PET base material of 000 m, the first undercoat layer coating liquid having the following composition has a film thickness of 0.4 μm after drying with a wire bar in an atmosphere of 20 ° C. and 55% RH.
Was applied so that After that, 140 of 15m in length
The first undercoat layer was applied by passing through a drying zone set at ° C at a conveying speed of 15 m / min.

Then, after corona discharge treatment was applied to the surface coated with the first undercoat layer, the following second undercoat layer coating solution was dried by an air knife method in an atmosphere of 35 ° C. and 22% RH. Was applied to give a film thickness of 0.1 μm.

Then, a drying zone having a length of 15 m and set at 140 ° C. is passed at a conveying speed of 15 m / min to apply a second undercoat layer, which is composed of a first undercoat layer and a second undercoat layer. An undercoat layer was formed.

(Composition of coating liquid for first undercoat layer) Acrylic latex particles (n-BA / tert-BA / St / HEMA) = (28/22/25/25) 36.9 parts by mass Surfactant (A) 0.36 parts by mass Hardener (a) 0.98 parts by mass Distilled water was added to the above material to make 1000 ml, to give a first undercoat layer coating liquid. In addition, each monomer used for forming the acrylic latex particles is shown below.

N-BA: n-butyl acrylate tert-BA: tert-butyl acrylate St: styrene HEMA: hydroxyethyl methacrylate (composition of the second undercoat layer coating solution) gelatin 9.6 parts by mass Surfactant (A) 0 0.4 parts by mass Hardener (b) 0.1 parts by mass Distilled water was added to the above material to make 1000 ml, to obtain a second undercoat layer coating solution.

[0090]

[Chemical 1]

<< Coating of Hydrophilic Layer >> On a PET substrate provided with an undercoat layer, the following hydrophilic layer coating solution was applied to a wire bar #
No. 5 was applied, and a drying zone set at 100 ° C. having a length of 15 m was passed at a conveying speed of 15 m / min. After coating, the wound roll was further subjected to heat treatment at 60 ° C. for 24 hours. The coating amount of the hydrophilic layer was 2.0 g / m ² .

(Preparation of Hydrophilic Layer Coating Liquid) An aqueous dispersion having a solid content of 30% is prepared in advance by mixing the following (a), (b) and (c).

(A) Colloidal silica (Snowtex S, solid content 30%; manufactured by Nissan Chemical Industries, Ltd.) 17.34 parts by mass (b) Colloidal silica (Snowtex PS-M, solid content 20%; Nissan Chemical Industries, Ltd.) 38.89 parts by mass (c) Aluminosilicate particles (AMT silica 08, particle size 0.6 μm; manufactured by Mizusawa Chemical Industry Co., Ltd.) 4.50 parts by mass The above-mentioned (a), (b) and (c) Solid content including 30
% Of the aqueous dispersion, the following materials were mixed and dispersed for 1 hour with a homogenizer to prepare a hydrophilic layer coating solution.

Sodium salt of carboxymethyl cellulose (4% aqueous solution) (manufactured by Kanto Chemical Co., Inc.) 5.00 parts by mass Fe, Mn, Cu complex oxide (MF black 4500, 40% aqueous dispersion; manufactured by Dainichi Seika Kogyo Co., Ltd.) ) 4.50 parts by mass 5% aqueous solution of montmorillonite (Bengel 31; Toyojun Yoko) 8.00 parts by mass 1% aqueous solution of silicon-based surfactant (FZ2161; manufactured by Nippon Unicar Co., Ltd.) 2.27 parts by mass Na ₃ PO ₄ (Kanto Chemical Co., Inc.) 10% aqueous solution 1.00 parts by weight Pure water 18.69 parts by weight << Application of image forming layer and production of planographic printing plate materials 1 to 4 >> The following composition was formed on the hydrophilic layer formed above. Coating solutions 1 to 4 for the image forming layer are applied using a wire bar # 5, and a drying zone having a length of 15 m and set at 60 ° C. is conveyed at a conveying speed of 15 m.
The image forming layer was formed by passing at a speed of 1 / min. In addition,
The coating amount of each of the image forming layers was 0.5 g / m ² .

After coating the image forming layer, the sample wound into a roll was subjected to heat treatment at 50 ° C. for 24 hours, and each of the lithographic printing plate materials 1 to 4 having the image forming layer as the first outermost layer was processed. Manufactured.

(Image Forming Layer Coating Liquid 1; Lipophilic and Containing Carnauba Wax Particles as Lubricating Components in Particle Form) Carnauba wax particle aqueous dispersion (Hi-Disper A-118, average particle size 0.5 μm) , Solid content 40%; manufactured by Gifu Shellac Co., Ltd.) 7.50 parts by mass Trehalose (treha; manufactured by Hayashibara Shoji) 2.00 parts by mass Pure water 90.50 parts by mass (image forming layer coating solution 2; lipophilic and particles) Carnauba wax particles are contained as a lubricity component of shape) Carnauba wax particle water dispersion (Hi-Disper A-118, average particle size 0.5 μm, solid content 40%; manufactured by Gifu Shellac Manufacturing Co., Ltd.) 3. 50 parts by mass Styrene acrylic latex (Iodosol GD87B, average particle size 0.09 μm, solid content 48%; manufactured by NSC Japan Ltd.) 3.00 parts by mass trehalose Treha; manufactured by Hayashibara Shoji Co., Ltd. 2.00 parts by mass Pure water 90.50 parts by mass (Image forming layer coating liquid 3; containing silicone oil as a lubricating component) Styrene acrylic latex (Iodosol GD87B, average particle size: 09 μm, solid content 48%; manufactured by Japan NSC Co., Ltd. 7.00 parts by mass Silicone oil (TSM631, manufactured by Toshiba Silicone) 0.50 parts by mass Trehalose (Treha; manufactured by Hayashibara Shoji) 2.00 parts by mass Pure water 90.50 parts by mass Parts (image forming layer coating solution 4; containing no lubricating component) Styrene acrylic latex (Iodozol GD87B, average particle size 0.09 μm, solid content 48%; manufactured by NSC Japan) 7.40 parts by mass Trehalose (trehah Manufactured by Hayashibara Shoji) 2.00 parts by mass pure water 90.50 parts by mass << Production of planographic printing plate material 5 >>: roll-shaped planographic printing plate In the production of Material 1, after coating the image forming layer, the sample wound into a roll is subjected to heat treatment at 50 ° C. for 24 hours, and then a package in which pulp / aluminum foil / polyethylene resin is laminated by lamination. Material {moisture permeability (JIS K 7129-1992; measurement conditions: test temperature 40 ° C., relative humidity 90% RH): 7 g / atm · m
^It was packaged at 2.25 ° C. · day} to obtain a planographic printing plate material 5.

<< Production of planographic printing plate material 6 >>: In the production of sheet-shaped planographic printing plate material 1, coating liquid 1 for image forming layer
After coating and drying, the product was cut into a sheet without being wound into a roll and subjected to heat treatment at 50 ° C for 24 hours.
A planographic printing plate material 6 having an image forming layer as the outermost surface layer was obtained.

The lithographic printing plate materials 1 to 6 obtained above are
Further, the following evaluation was performed on each of the samples that were placed in the environment of 25 ° C. and 50% RH for one day and each of the samples that were placed in the environment of 35 ° C. and 80% RH for one day.

<< Evaluation of Presence or Absence of Transfer of Lubricating Component >> The surface of the lithographic printing plate materials 1 to 6 opposite to the surface (first outermost surface layer) coated with the image forming layer (second outermost surface layer). ) Is confirmed by a transmission electron microscope (TEM, magnification: 10,000 times), and it is confirmed whether the lubricating component is transferred. The results are shown in Table 1.

<< Measurement of Static Friction Coefficients of First Outermost Layer and Second Outermost Layer >> For each of the planographic printing plate materials 1 to 6 described above, the surface coated with the image forming layer side (first outermost surface layer). )
The coefficient of static friction before winding and the coefficient of static friction after winding on the opposite surface (second outermost surface layer) were measured.

Table 1 shows that at 25 ° C. and 65% RH,
The values of the static friction coefficient before and after winding are shown. In Table 2, the values of the static friction coefficient before and after winding at 35 ° C. and 80% RH are shown.

The static friction coefficient is measured according to JIS K.
The test was performed according to the friction coefficient test method specified in 7125.

<< Evaluation of Transportability >>: Counting Number of Occurrences of Transport Jam As the image recording device 25 of the printing device described in Japanese Patent Laid-Open No. 10-272756, a semiconductor laser (emission wavelength
The transportability was evaluated using a printing apparatus in which 0 nm, laser power) was introduced (see FIG. 1).

The plate feeding method in this printing apparatus is as follows:
First, the planographic printing plate material is set on the plate feeding mechanism 23. The installed lithographic printing plate material is fed to the plate cylinder through the guide roll 53 and the guide rail 55. The planographic printing plate material is cut by a cutter 54 so as to have a desired length and then wound around the plate cylinder. The sent planographic printing plate material is wound around the plate cylinder while being brought into close contact with the plate cylinder by the plate pressing roll 62.

Check whether jam occurs during this operation.
Repeat 0 times to count the number of times a conveyance jam has occurred.

This evaluation was carried out by lithographic printing plate materials 1 to 6 which had been placed in the environment of 25 ° C., 65% RH and 35 ° C., 80% RH for 1 day (for the plate feeding of the lithographic printing plate material 6, the guide roll 53 was used. I let it out and rolled it out to the plate cylinder.)
I went about.

<< Print Evaluation >> Guide rolls 53 and 55
The lithographic printing material wound around the plate cylinder through the image recording device 25 (semiconductor laser) is set to 250 mJ / cm.
^A 30% flat screen image is exposed on the entire plate surface with energy of ² . After exposure, the lithographic printing plate material is moved to the printing site without being subjected to a development treatment.

While the plate cylinder is rotating, a 2% aqueous solution of Astromark 3 (manufactured by Nikken Chemical Laboratory) is supplied from the dampening water supply device 22 for 10 seconds, and then the high echo M (black ink) (ink) is supplied from the ink supply device 10. Toyo Ink Mfg. Co., Ltd.) was supplied and paper was fed to perform printing. Scratches on the obtained printed matter (guide roller 53 and guide rail 55
It is thought that this is caused by the sliding of the lithographic printing plate material and the).

The results obtained as described above are shown in Tables 1 and 2.

[0110]

[Table 1]

[0111]

[Table 2]

From Table 1 and Table 2, as compared with the comparative sample, the first outermost surface layer contains a lubricating component, and in particular, the lubricating component has a particle shape, and is wound into a roll in its manufacturing process. The lithographic printing plate material that has undergone the steps (also referred to as having a step of winding into a roll as a history at the time of manufacturing) does not depend on fluctuations in the storage environment,
It is clear that the frequency of scratches on printed matter is low.

Further, it was confirmed that, in the manufacturing process, the product packaged with the packaging material did not cause any conveyance jam or scratch stain regardless of the change in the storage environment.

[0114]

According to the present invention, there are provided a lithographic printing plate material which is free from transport scratches and transport defects during transportation, has few image defects, and is low in cost, and a method for producing the same, and printing using the lithographic printing plate material. I was able to provide a method.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an aspect of a printing apparatus used in a printing method of the present invention.

[Explanation of symbols]

11 First plate cylinder 12 Second plate cylinder 13 First Blanket Body 14 Second Blanket Body 15 impression cylinder 16 Paper feed cylinder 17 Output cylinder 20 Ink supply device 21 Dampening water supply system 22 Damping water supply device 23 Plate Supply Department 24 Plate ejection section 25 Image recording device 26 Development Processing Equipment 27 Paper feeder 28 Paper output section 31 First plate cylinder moving mechanism 32 Second plate cylinder moving mechanism 33 bearings 35 slots 36 spindle 38 Slide holder 39 motor 41 ball screw 57 grippers 215 plate cylinder P printing plate S printing paper

Claims (13)

[Claims] 1. A method for producing a lithographic printing plate material having at least an image forming layer on a substrate, wherein the first outermost surface layer on the side having the image forming layer on the substrate contains a lubricating component. The method for producing a lithographic printing plate material, comprising the steps of: 2. A step of wrapping with a wrapping material after the step of winding into a roll is included.
The method for producing a lithographic printing plate material as described in. 3. The method for producing a lithographic printing plate material according to claim 1, wherein the lithographic printing plate material is in a roll shape. 4. A lithographic printing plate material having at least an image forming layer on a base material, wherein the first outermost surface layer on the side having the image forming layer on the base material is adjusted to contain a lubricating component. A planographic printing plate material, which is manufactured through a process and a roll-up process. 5. The lithographic printing plate material according to claim 4, wherein the lithographic printing plate material is manufactured through a step of packaging with a packaging material after the step of winding into a roll. 6. The lithographic printing plate material according to claim 4, wherein the lubricating component is in the form of particles. 7. The first outermost layer is an image forming layer,
The lithographic printing plate material according to any one of claims 4 to 6, wherein the lubricating component is a lipophilic thermoplastic or heat-meltable particle. 8. The lithographic printing plate material according to claim 4, wherein a hydrophilic layer is provided between the substrate and the image forming layer. 9. The lithographic printing plate material according to claim 4, wherein the base material is made of plastic. 10. The first outermost surface layer has a coefficient of static friction of 0.05 or more and less than 2.0 before the step of winding into a roll, and the first outermost layer after the step of winding into a roll. Has a coefficient of static friction of 0.
It is 05 or more and less than 2.0.
10. The lithographic printing plate material as described in any one of 9 above. 11. The coefficient of static friction of the first outermost surface layer before the step of winding into a roll is 0.05 or more and less than 2.0, and the coefficient of static friction of the second outermost surface layer is 2.0 or more and 5.
It is 0 or less, and the static friction coefficients of the first outermost surface layer and the second outermost surface layer after the step of winding into a roll are both 0.05 or more and less than 2.0. Item 10. The planographic printing plate material according to Item 10. 12. The lithographic printing plate material as claimed in claim 4, which has a roll shape. 13. A lithographic printing plate material A manufactured by the manufacturing method according to claim 1, or
A step of recording an image on the lithographic printing plate material B according to any one of claims 4 to 12 with a laser beam,
A fountain solution and ink are supplied to the planographic printing plate material A or the planographic printing plate material B on which the image recording is performed to form an ink image on the planographic printing plate material A or the planographic printing plate material B. A printing method comprising a step of forming and a step of transferring the formed ink image to a sheet-shaped substrate.