JP2007076301A - Cutting method for planographic printing plate material, and printing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method for a planographic printing plate material which prevents a defect from appearing on a planographic printing plate even after a slit is formed, can be stably handled and is excellent in printing performance, and a printing method. <P>SOLUTION: This cutting method is used for an original plate for planographic printing, in which at least a hydrophilic layer containing particles is provided on a plastic film substrate, and in which an image forming layer is sequentially provided. Characteristically, when a continuous strip-shaped plastic film substrate of the original plate for planographic printing is slitted in a predetermined size with a disc-shaped upper blade and a drum-type lower blade 2, the amount of the approach of the upper blade 1 to the lower blade 2 is in the range of 0.3-2.8 kg; the angle of the cutting edge of the upper blade 1 is in the range of 30-85°; and the mount of the pushing-in of the upper and lower blades 1 and 2 is in the range of 0.5-2.5 mm. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lithographic printing plate material cutting method and printing method, and more specifically, a lithographic printing plate capable of recording an image based on a digital signal and obtaining a stable printed matter without coating defects. The present invention relates to a material cutting method and a printing method.

  The present invention relates to a lithographic printing plate precursor, and more particularly, to a lithographic printing plate precursor bar coating and manufacturing method capable of recording an image based on a digital signal and obtaining a stable printed matter without coating defects.

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

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

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

  For example, in JP-A-9-123387, 9-123388, and 9-131850, a lithographic printing plate precursor containing thermoplastic particles dispersed in a hydrophilic binder is attached to a printing machine, and A method for producing a lithographic printing plate by development is disclosed. According to these techniques, it is possible to produce a printing plate without performing alkali development and without requiring a developing machine, and it is possible to provide a lithographic printing plate that does not require development processing in a pseudo manner.

  In the planographic printing plate precursor, it is also described that a plastic film can be used as a support in recent years without using a hydrophilic aluminum substrate as a support.

  Plastic film has lower thermal conductivity than metal, and can be efficiently used for image formation without diffusing heat generated in the heat-sensitive layer by laser exposure during image formation to the support. It has the advantage of being inexpensive compared to the body.

As a printing plate using such a plastic film as a support, examples of use of a support having a corona-treated surface are given in the publication, and a support subjected to a plasma treatment is disclosed. (For example, see Patent Document 1)
Moreover, in the metal support of the photosensitive lithographic printing plate, a gap between the upper blade and the lower blade is defined and a short part burr is described (for example, see Patent Document 2), but a filler is provided on the plastic film support. It does not describe a lithographic printing original plate in which a hydrophilic layer and an image forming layer are sequentially provided, but the finished performance of the lithographic printing original plate, which is characterized by printing on an on-press developing process, It does not describe transport performance.

In an original plate for lithographic printing using a plastic film support, it has been desired that the lithographic printing plate is free from defects even after slitting and that stable handling and printing performance are obtained.
JP-A-9-314794 JP-A-10-35130

  An object of the present invention is to provide a lithographic printing plate material cutting method and printing method in which a lithographic printing plate is free from defects even after slitting, is stable in handling, and has excellent printing performance.

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

  1. In a lithographic printing plate precursor cutting method comprising a hydrophilic layer containing at least particles on a plastic film support, and sequentially providing an image forming layer, the continuous belt-like plastic film support of the lithographic printing plate precursor has a predetermined size When slitting using a disk-shaped upper blade and a drum-shaped lower blade, the amount of movement of the disk-shaped upper blade with respect to the drum-shaped lower blade is 0.3 to 2.8 kg, and the edge angle of the disk-shaped upper blade is 30 to A method for cutting an original plate for lithographic printing, wherein the pressing amount of the disk-shaped upper blade and the drum-shaped lower blade is 85 to 2.5 mm at 85 degrees.

  2. 2. The lithographic printing plate material cutting method according to 1 above, wherein a moving amount of the disk-shaped upper blade with respect to the drum-shaped lower blade is 0.5 to 1.5 kg.

  3. 3. The method for cutting a lithographic printing plate material according to 1 or 2, wherein the particles are hydrophilic inorganic particles.

  4). 4. The method for cutting a lithographic printing plate material according to any one of 1 to 3, wherein the hydrophilic layer contains 60 to 90% by mass of hydrophilic inorganic particles.

  5. The lithographic printing plate material obtained by the lithographic printing plate precursor cutting method according to any one of 1 to 4 above is subjected to laser exposure based on image information, and subjected to on-press development processing for printing. Printing method.

  As a result of various studies, the present inventor has found for the first time that with any of the above-described configurations, the lithographic printing plate is free from defects even after slitting and stable handling and printing performance can be obtained.

  The lithographic printing plate material cutting method and printing method according to the present invention have an effect that the lithographic printing plate is free of defects even after slitting, is stable in handling, and has excellent printing performance.

  Hereinafter, the present invention will be described in detail.

  Schematic which shows an example which slits the continuous strip | belt-shaped plastic film support body of this invention to a predetermined size using a disk-shaped upper blade (henceforth only a lower blade) and a drum-like lower blade (henceforth only a lower blade). It is.

  Moreover, Fig.2 (a) is a schematic diagram which shows a mode that the upper blade of this invention is pushed into a lower blade at the time of a slit. FIG. 2B is a schematic view showing an example in which the upper blade is fixed by the shaft 8, the holder 7, and the spring 6. FIG. 3C is a schematic diagram showing an example of FIG.

  In the present invention, in a method for cutting a lithographic printing original plate in which a hydrophilic layer containing at least particles and an image forming layer are sequentially provided on a plastic film support (base 10), the continuous belt-like plastic of the lithographic printing original plate is provided. When the film support (base 10) is slit to a predetermined size using the disk-shaped upper blade 1 and the drum-shaped lower blade 2, the amount of offset 4 of the disk-shaped upper blade to the drum-shaped lower blade is 0.3 to 2.8 kg. It is essential.

  If the amount of shift is less than 0.3 kg, the short slits are not cut uniformly, the slit dimensions are shifted, mist is generated, and harmful effects are caused.

  It has been found that when the amount of shift exceeds 2.8 kg, excessive stress is applied to the short part of the base, and deformation of the short part of the base = waving, which causes poor handling and poor printing performance.

  In addition, in this invention, it is preferable at the point which show | plays the effect of this invention more that it is 0.5-1.5 kg.

  Further, in the present invention, when the blade edge angle 3 of the disk-shaped upper blade is 30 to 85 degrees and the pushing amount of the disk-shaped upper blade and the drum-shaped lower blade is 0.5 to 2.5 mm, Of the waves, it was found that handling properties and printing performance were further stabilized and improved.

  An example of the wave height in the present invention is shown in FIG. 3. In FIG. 3, the position C is the highest in the wave height.

  When the blade edge angle of the upper blade is more acute than 30 degrees, in the lithographic printing original plate of the present plastic film support containing particles, excessive stress is applied to the base short part, which causes the base short part to be more than expected. I found it unstable.

  When the blade edge angle of the upper blade is more obtuse than 85 degrees, in the lithographic printing plate precursor of the present plastic film support containing particles, the shearing ability of the base short part is deteriorated, so that the cutting becomes worse and excessive. It was found that the load was generated in the short part of the base and the deformation of the short part of the base occurred more than expected.

  From the above, in the present invention, the blade edge angle of the upper blade is 30 to 85 degrees.

  Moreover, in this invention, the pushing amount of an upper blade and a lower blade is 0.5-2.5 mm.

  If the push-in amount is less than 0.5 mm, the plastic blade support containing particles may cause the upper blade to jump out (jump over the base of the upper blade tip) or shear the short portion of the base. It was found that the ability deteriorated, the cutting became worse, an excessive load was generated in the base short part, and the base short part deformation occurred.

  If the push-in amount exceeds 2.5 mm, excessive stress is applied to the base short part of the lithographic printing plate precursor of the present plastic film support containing particles, which causes deformation of the base short part more than expected. It has been found by the present invention that the handling becomes unstable and the printing performance is affected.

  From the above, in the present invention, 30 to 85 degrees, and the pushing amount of the upper blade and the lower blade is 0.5 to 2.5 mm.

(Slit short part)
In the present invention, the short slit portion is defined as the end portion of the base when slitted.

(Namiuchi)
In the present invention, the wavy is defined as the height of the float of the short portion of the base.

  The higher the height, the higher the float = the wave, which affects the handling, printing plate misalignment, and dimensional stability.

(particle)
The particle type of the present invention can be used without particular limitation as long as it satisfies the present invention. Porous, nonporous, organic resin particles, and inorganic fine particles may be used, but porous inorganic particles are the best.

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

(Porous inorganic particles)
The porous inorganic particles are generally produced by a wet method or a dry method. In the wet method, it can be obtained by drying and pulverizing a gel obtained by neutralizing an aqueous silicate solution, or by pulverizing a precipitate deposited after neutralization. In the dry method, silicon tetrachloride is burned together with hydrogen and oxygen to obtain silica. These particles can be controlled in porosity and particle size by adjusting the production conditions. As the porous silica, those obtained from a wet gel are particularly preferable.

  Examples of the porous inorganic particles include: Porous silica, 2. 2. aluminosilicate; Zeolite etc. are mentioned.

  The porous aluminosilicate No. 2 is produced, for example, by the method described in JP-A-10-71764.

  That is, it is an amorphous composite particle synthesized by hydrolysis using aluminum alkoxide and silicon alkoxide as main components. Moreover, what was manufactured as composite particle | grains of 3 or more components by adding the alkoxide of another metal at the time of manufacture can be used for this invention. These composite particles can also control the porosity and particle size by adjusting the production conditions.

  Examples of the inorganic fine particles include silica gel, calcium carbonate, titanium oxide, acid clay, activated clay, alumina, and the like. Examples of the organic fine particles include resins such as fluororesin particles, guanamine resin particles, acrylic resin particles, and silicon resin particles. Particles can be mentioned.

(Upper blade, lower blade)
For example, SKH (high speed steel), SKD (die steel), CM (tool steel), TH102 (stainless steel), STT (hard metal), etc. Good, no particular restrictions.

(Amount of movement relative to the lower blade of the upper blade)
In the present invention, the amount of movement of the upper blade relative to the lower blade is defined as the force required for the upper blade to contact the lower blade = kg.

  The amount of shift is determined by the total of the distance between the upper blade and the lower blade, the spring length of the upper blade, the wire diameter of the spring, the spring material, and the tolerances of the upper blade inner diameter and the holder outer diameter.

  The approach amount is measured using a push-pull gauge, the side of the upper blade is pushed with the push-pull gauge, the force that the upper blade starts to move is measured, and the average of four points on the same interval of the circular upper blade is taken.

(Support)
(Plastic film support)
There is no restriction | limiting in particular as a plastic film support body used for this invention, For example, the paper processed by the metal, the plastic film, polyolefin, etc., Furthermore, the composite base material etc. which bonded these materials suitably can be used.

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

(Binder resin)
The hydrophilic layer and the image forming layer binder resin of the lithographic printing original plate can be used without any particular limitation.

  For example, vinyl chloride resins such as polyurethane, polyester, vinyl chloride copolymer, vinyl chloride resins such as vinyl chloride-vinyl acetate copolymer, polyolefin resins such as butadiene-acrylonitrile copolymer, polyvinyl butyral, etc. Polyvinyl acetal resin, cellulose resin such as nitrocellulose, styrene resin such as styrene-butadiene copolymer, acrylic resin such as polymethyl methacrylate, polyamide, phenol resin, epoxy resin, phenoxy resin, polyvinyl butyral, polyvinyl aceto There are acetal resins such as acetal and polyvinyl formal, and water-soluble resins such as polyvinyl alcohol and gelatin.

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

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

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

(Form of image forming layer)
The image forming layer of the lithographic printing plate precursor according to the invention can be selected and contained from heat-fusible particles that can be fused by heat and substances that exhibit lipophilicity by heat.

Examples of heat-meltable particles that can be fused by heat include waxes, acrylic resins, ionomer resins, vinyl acetate resins, vinyl chloride resins, synthetic rubbers, polyurethane resins, polyester resins, fluorine resins, silicone resins, etc. And those obtained from latex or emulsion dispersed in water. Of these, those having a melting point of 70 to 180 ° C. are preferred, and the hydrophilic component of the surface energy is preferably 10 ⁻⁴ N / cm ² or less. When the melting point is lower than this temperature, the performance during storage tends to deteriorate, and when it is higher than this temperature, the image strength cannot be obtained and the printing durability tends to deteriorate. Further, when the surface energy is within this range, the ink deposition property of the image portion is improved. In this respect, waxes, acrylic resins, and synthetic rubbers are particularly preferable as the hot-melt material.

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

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

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

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

(Preparation of lithographic printing plate precursor)
The lithographic printing plate precursor according to the invention can be produced by providing a photosensitive layer on the above-mentioned support.

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

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

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

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

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

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

(On-machine development)
The on-press development in the present invention refers to the following.

  A method for removing an unexposed portion of an image forming layer of a lithographic printing plate precursor by mounting the exposed lithographic printing plate precursor on a cylinder of a printing press and supplying dampening water and ink while rotating the cylinder. It is.

  In other words, the lithographic printing plate precursor is exposed and then mounted on a printing machine as it is, and the development process is completed in a normal printing process.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, the embodiment of this invention is not limited to these.

<< Manufacture of support body >>: Preparation of polyester film Teijin-DuPont Films Co., Ltd. Grade S PET 175 μm film was subjected to a corona discharge treatment of 8 W / m ² · min, and then as shown in Table 1 Then, after coating the following undercoat coating liquid a on one surface so as to have a dry film thickness of 0.8 μm, the undercoat coating liquid b was applied to a dry film thickness of 0.8 mm while performing corona discharge treatment (8 W / m ² · min). It apply | coated so that it might become 1 micrometer, and it dried each at 180 degreeC for 4 minutes (undercoat surface A).

Also, after coating the following undercoat coating solution c on the opposite side so as to have a dry film thickness of 0.8 μm, the undercoat coating solution d is dried film thickness 1 while performing corona discharge treatment (8 W / m ² · min). The coating was applied to a thickness of 0.0 μm and dried at 180 ° C. for 4 minutes (undercoating surface B). The surface electrical resistance at 25 ° C. and 25% RH after coating was 10 ⁸ Ω. Moreover, the static friction coefficient with respect to EPDN of the surface of the undercoating surface B side was 0.60. Subsequently, the surface of each undercoat layer was subjected to plasma treatment under the following plasma treatment conditions.

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

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

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

<< Undercoat coating liquid c >>
Styrene / glycidyl methacrylate / butyl acrylate = 20/40/40 ternary copolymer latex 0.4% (based on solid content)
Styrene / glycidyl methacrylate / butyl acrylate / acetoacetoxyethyl methacrylate = 39/40/20/1 quaternary copolymer latex 7.6%
Anionic surfactant S-1 0.1%
Water 91.9%
<< Undercoat coating liquid d >>
Conductive composition of component d-1 / component d-2 / component d-3 = 66/31/1 6.4%
Hardener H-2 0.7%
Anionic surfactant S-1 0.07%
Matting agent (silica, average particle size 3.5 μm) 0.03%
Water 93.4%
Component d-1;
An anionic polymer compound comprising a copolymer of sodium styrenesulfonate / maleic acid = 50/50; component d-2;
Three-component copolymer latex consisting of styrene / glycidyl methacrylate / butyl acrylate = 40/40/20 component d-3;
Polymeric activator comprising styrene / sodium isoprenesulfonate = 80/20

  The following first hydrophilic layer coating solution and second hydrophilic layer coating solution were provided on the undercoat surface A side of the polyester film in this order.

  The first hydrophilic layer coating solution was applied using a bar so as to have a dry film of 1.8 (μm).

(First hydrophilic layer coating solution)
Snowtex-XS [Nissan Chemical Industry Co., Ltd.] Average particle size 0.005 μm
9.62 parts Snowtex-ZL [Nissan Chemical Industry Co., Ltd.] Average particle size 0.085 [mu] m 0.6 parts Shilton JC-40 [Mizusawa Chemical Industry Co., Ltd.] Average particle diameter 4.0 [mu] m 2.22 parts Opt beads 6500S [ NISSAN CHEMICAL INDUSTRY CO., LTD] Average particle size of coated particles 6.5μm
3 parts Sodium carboxymethylcellulose [Kanto Chemical Co., Ltd.] 0.12 parts Mineral colloid MO [Wilver-Ellis Co., Ltd.] 0.22 parts MF-4500 Black [Daiichi Seika Kogyo Co., Ltd.] Photothermal conversion material 4 parts Trisodium phosphate・ 12 water salt [Kanto Chemical Co., Ltd.] 0.06 part FZ-2161 [Nihon Unicar Co., Ltd.] 0.16 part Pure water 80 part Furthermore, the second hydrophilic layer has a dry film thickness of 0.6 μm on the first hydrophilic layer. A hydrophilic layer coating solution was provided.

(Second hydrophilic layer coating solution)
Snowtex-S [Nissan Chemical Industry Co., Ltd.] Average particle size 0.009 μm 1.56 parts Snowtex-PSM [Nissan Chemical Industry Co., Ltd.] Average particle size 0.095 μm
2.34 parts Shilton JC-20 [Mizusawa Chemical Industry Co., Ltd.] Average particle size 1.5 μm 1.2 parts AMT-08 [Mizusawa Chemical Industry Co., Ltd.] Average particle size 0.95 μm 3.6 parts MP-4540 [Nissan Chemical Industry Co., Ltd.] Average particle size 0.45 μm 1.8 parts Sodium carboxymethyl cellulose [Kanto Chemical Co., Ltd.] 0.12 parts Mineral colloid MO [Wilver-Ellis Co., Ltd.] 0.24 parts MF-4500 Black [Daiichi Seika Kogyo Co., Ltd.] Photothermal conversion material 1.08 parts Trisodium phosphate / 12 hydrate [Kanto Chemical Co., Ltd.] 0.06 parts Pure water 88 parts The obtained second hydrophilic layer laminate product has a dry film thickness of 0.55. The following image forming layer coating was performed using a bar coating device so as to be (g / m ² ).

(Image forming layer)
HI-DISPER A-206 [Gifu Shellac Manufacturing Co., Ltd.] Average particle diameter of heat-meltable particles 0.5 μm 2.5 parts DL-522 [Nippon Catalyst Co., Ltd .: average molecular weight 170.000] 0.75 parts HI-DISPER A118 [Gifu Shellac Manufacturing Co., Ltd.] Average particle size of heat-meltable particles 0.3 μm 6.55 parts Pure water 88.5 parts Isopropyl alcohol 1.5 parts Penon JE-66 [Nippon Chemical Co., Ltd.] 0.2 parts 1 and 2 from the image forming layer side of the plastic film belt-like support provided with the above three layers, the material SKH, the upper blade angle 60 degrees (manufactured by Toyo Cutlery Co., Ltd.), and the lower blade edge angle 90 degrees (Toyo Cutlery) Co., Ltd.) flat blade, upper blade lower blade push amount 1.0mm, upper blade, lower blade gap 3mm, side pressure 0.8kg, ear 1 4.25cm, A side 55cm, B side 55cm It was slit in the ear 2 4.25cm width.

  The side pressure was measured with a push-pull gauge (manufactured by Shiro Sangyo Co., Ltd.).

  The plates for which printing evaluation was performed after the two-threading were called the A and B sides, and the following evaluations were made.

  This sample is designated as Sample 1 (Sample No. 1).

  In addition, as shown in Table 1, sample No. 1 was changed except that the upper blade angle, the push-in amount, and the shift amount were changed. In the same manner as in Sample 1, 2-16 were produced.

  The following evaluation was performed.

(Evaluation)
(Length after slit)
The actual length width on the plate A side and B side after the slit was measured, and the difference between the long width and the theoretical value width was expressed.
The smaller the difference, the better the slit accuracy. (In Table 1, columns A and B)
(Wave height mm)
Cut the sample 1m in length after slitting into a 600mm width double strip, and measure the highest part of the short part on the 1m side side at 23 ° C, 48% environment including the base thickness.

  The higher the height, the higher the float = the wave, which affects the handling, printing plate misalignment, and dimensional stability. The float of the short part of the base is defined as the wave.

(Attachment of plate to printing press)
B) The ability to attach the plate to the printing press was evaluated by the following ranks, with 100 people performing the installation.

  A higher total score is better.

3 ... No problem 2 ... Slightly difficult to install, but acceptable level 1 ... Some problems are difficult to mount b) The fifth sample was handled immediately after carrying out the following transportability at 23 ° C and 48% environment The state of time was evaluated according to the following rank.

  The same evaluation was performed by 100 people, and the following ranks were listed. A larger number is better.

3 ... No problem 2 ... Slightly poor handling, but acceptable level 1 ... Difficult to install (Handling)
Each sample after slitting to a width of 600 mm is wound around a 3 × 2.54 cm core with the image layer being wound out of the surface of the image layer, and 20 sheets are continuously conveyed using a color decision type II (manufactured by Konica Corporation) to evaluate the transportability. went.

3 ... No problem 2 ... There is a wave in the short part and it is difficult to handle, but it can be handled 1 ... There was a wave in the short part and felt uncomfortable The following evaluation was further performed.

(Exposure and printing of lithographic printing plate precursor)
Using the obtained lithographic printing plate precursor, a semiconductor laser light source (light emission wavelength: 830 nm, spot size: 10 μm, resolution is 2000 dpi in both the scanning direction and the sub-scanning direction), a 175-line equivalent 50% dot image and a solid image, The exposure was performed with the irradiation energy amount on the image surface being 250 mJ / cm ² while changing the scanning speed.

  In addition, dpi represents the number of dots per 2.54 cm.

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

(Number of printed products with good quality)
The number of printed sheets was visually evaluated until the finished quality of the printed material with a halftone dot image of 50% was practically usable and became good.

  The smaller the number of sheets, the better.

(Print plate misalignment, dimensional stability)
After printing, the 100th and 10000th printed materials were stacked on a light table, and image pattern displacement was observed. The larger the deviation, the worse the dimensional stability.

  Furthermore, the upper blade angle (both manufactured by Toyo Knife Co., Ltd.), the upper blade push-in amount, and a sample with a different amount of shift were also evaluated for comparison. The results are shown in the table below.

  As can be seen from the table, the sample of the present invention has a better handleability and a printing plate with better printing performance than the comparison.

It is the schematic which shows an example which slits a continuous strip | belt-shaped plastic film support body (base) to a predetermined size using a disk-shaped upper blade and a drum-shaped lower blade. It is the schematic which shows an example of the upper blade at the time of a slit pushing into a lower blade, an example of fixation of an upper blade, and an example which looked at the upper blade from the cross section. It is the schematic which shows an example of the mode of the wave height of this invention.

Explanation of symbols

1 Upper blade 2 Lower blade 11 Corrugated height 12 Corrugated height 13 Corrugated height 14 Corrugated height

Claims (5)

In a lithographic printing plate precursor cutting method comprising a hydrophilic layer containing at least particles on a plastic film support, and sequentially providing an image forming layer, the continuous belt-like plastic film support of the lithographic printing plate precursor has a predetermined size When slitting using a disk-shaped upper blade and a drum-shaped lower blade, the amount of movement of the disk-shaped upper blade with respect to the drum-shaped lower blade is 0.3 to 2.8 kg, and the edge angle of the disk-shaped upper blade is 30 to A method for cutting an original plate for lithographic printing, wherein the pressing amount of the disk-shaped upper blade and the drum-shaped lower blade is 85 to 2.5 mm at 85 degrees. 2. The planographic printing plate material cutting method according to claim 1, wherein the amount of movement of the disk-shaped upper blade with respect to the drum-shaped lower blade is 0.5 to 1.5 kg. The lithographic printing plate material cutting method according to claim 1 or 2, wherein the particles are hydrophilic inorganic particles. The lithographic printing plate material cutting method according to any one of claims 1 to 3, wherein the hydrophilic layer contains 60 to 90 mass% of hydrophilic inorganic particles. A lithographic printing plate material obtained by the lithographic printing plate precursor cutting method according to any one of claims 1 to 4 is subjected to laser exposure based on image information, and subjected to on-press development processing for printing. How to print.

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