JP2006007353A - Cutting method of wide band-like planographic printing plate material and roll-like planographic printing plate material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutting method of cutting a wide band-like planographic printing plate material having a hydrophilic layer and an image forming layer in order on a plastic film base material and a back layer on the back to a narrow band-like planographic printing plate material without the occurrence of burr in the cut surface and separation of the back layer, and a roll-like planographic printing plate material formed by winding the narrow band-like planographic printing plate material round a winding core. <P>SOLUTION: In this cutting method, the hydrophilic layer and the image forming layer are formed in order on the running long plastic film base material, and the band-like planographic printing plate material having the back layer on the back is continuously cut to at least two narrow band-like planographic printing plate materials along the running direction using at least one set of rotary blades having a set of a disc-like upper blade and a drum-like lower blade rotated in the opposite directions to each other. In the cutting method of the wide band-like planographic printing plate material, the scratch strength of the back layer is 100 to 350g, and the back layer side is abutted on the upper blade side to cut the material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for cutting a roll lithographic printing plate material having a hydrophilic layer and an image forming layer in this order on a plastic film substrate and having a back layer on the back side, and a sheet-like lithographic plate produced by this cutting method It relates to printing plate materials.

  With the digitization of print data, CTP that records image data directly on a printing plate has become widespread. The printing plate material used for CTP (Computer to Plate) includes a metal type using an aluminum base material and a flexible type having a functional layer as a printing plate on a film base material as in the case of a conventional PS plate. is there. In recent years, in commercial printing, there is a tendency to reduce the number of various types of printing, and there is a strong demand for high-quality and low-cost printing plate materials in the market.

  Conventional flexible type printing plate materials are, for example, those in which a silver salt diffusion transfer type photosensitive layer is provided on a film substrate as disclosed in JP-A-5-66564, or JP-A-8-507727. Either a hydrophilic layer or a lipophilic layer on a film substrate as disclosed in JP-A-6-186750, JP-A-6-199064, JP-A-7-314934, JP-A-10-58636, or JP-A-10-244773 The surface layer is laminated as a surface layer, and the surface layer is ablated by laser exposure to form a printing plate or a hydrophilic layer and a heat layer on a film substrate as disclosed in JP-A-2001-96710. A meltable image forming layer is provided, and the image forming layer is melt-fixed on the hydrophilic layer by heating the hydrophilic layer or the image forming layer in an image-like manner by laser exposure. It is below.

  The silver salt diffusion transfer system is not suitable for high-quality printing because it requires wet development and drying processes after exposure, and dimensional accuracy in the image forming process cannot be obtained sufficiently.

  The ablation method does not require development processing, but the dot shape tends to become unstable because an image is formed by ablation of the surface layer. Further, contamination of the material surface and the inside of the exposure apparatus due to the ablated surface layer scattering may occur.

  A method of converting a laser beam into heat and forming a heat-melted image on a hydrophilic layer provides a sharp dot shape and is suitable for high-definition image formation. In this method, the printing plate after image writing is printed with an offset printing machine, and only the image forming layer in the non-image area is swollen and dissolved with fountain solution on the printing paper (waste paper) at the initial printing stage. In some cases, so-called development on a printing press that can be transferred and removed is possible. In this case, since a development process after exposure is not required, the product is excellent in quality stability and environmental suitability.

  In the case of CTP, in order to increase production efficiency, it is common to continuously and automatically operate a plate output device. A lithographic printing plate material using a film substrate is generally supplied into the output device in the form of a rolled lithographic printing plate material wound in a roll, and automatically cut and conveyed to a predetermined size in the output device. It is used after being fixed to an exposure member and subjected to exposure (image writing).

  In general, a rolled lithographic printing plate material has a wide belt-like desktop development having a hydrophilic layer and an image forming layer in this order on a wide plastic film support in this order and a back layer on the back surface in order to increase production efficiency. After the mold printing plate material is produced, it is cut into a required narrow width to obtain a narrow strip-like planographic printing plate material, and then wound around a winding core to produce a roll shape.

  When mounting a roll lithographic printing plate material on an output device, it is common to mount a roll lithographic printing plate material loaded in a magazine from the viewpoint of ease of handling, mounting position accuracy, and quality stability. Is.

  In non-contact image writing such as laser exposure, foreign matter adhering to the printing plate material tends to be a defect on the output image. In the case of a printing plate material that is not subjected to a liquid development process, foreign matter adhering to the unexposed area also becomes an image defect. Furthermore, when it adheres to the back side of the printing plate material, the flatness of the printing plate material at the time of exposure deteriorates, resulting in non-uniform exposure, which may cause image defects and printing unevenness. For this reason, in the on-press development type printing plate material as in the present invention, it is necessary to manage the foreign matter more strictly than the conventional printing plate material.

  In the case of a roll-shaped lithographic printing plate material, the coated film may be peeled off in the cutting process to cut the wide-band lithographic printing plate material into a narrow-banded lithographic printing plate material, and the rolled-up lithographic printing plate material may be produced by entraining the removed coated film. .

  In general, not only in lithographic printing plate materials, but also in the cutting process in which a wide strip recording material having an image recording layer on a substrate is converted into a narrow strip recording material, countermeasures against film peeling are taken. With a cutting device that has multiple sets of rotating blades consisting of a set of upper blades and lower blades whose blade edge angle rotates in the direction of 30 to 90 °, by cutting with the image forming layer side as the lower blade side, A cutting method that prevents the image forming layer from peeling off is known (see, for example, Patent Document 1).

  However, the strip-shaped planographic printing plate material having the cutting method described in Patent Document 1 having a hydrophilic layer and an image forming layer in this order on a plastic film substrate, and a back layer having a scratch strength of 100 to 350 g on the back surface. When it is applied to the above, peeling of the image forming layer can be prevented, but the following problems are newly mentioned and the application is not possible.

  1) A burr may occur on the image forming layer side of the cut surface. If burrs are formed on the image forming side, the image forming layer may be damaged via a roller, a blanket or the like, thereby causing printing stains. Further, if the height of the burr is large, a conveyance failure may occur.

  2) The back layer peels off and adheres to the image forming layer side, which may cause a failure.

From such a situation, a wide-band lithographic printing plate material having a hydrophilic layer and an image forming layer in this order on a plastic film substrate and having a back surface layer with a scratch strength of 100 to 350 g on the back surface is shown in a cut surface. A cutting method for continuously cutting into a narrow-width strip lithographic printing plate material to prevent generation of burrs and peeling of the back surface layer, and a narrow-width strip lithographic printing plate material cut by this cutting method is wound around a winding core to form a roll. Development of roll-shaped lithographic printing plate materials is desired.
JP 2003-11086 A

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a wide-band lithographic printing plate material having a hydrophilic layer and an image forming layer in this order on a plastic film substrate, and having a back layer on the back surface. A cutting method for preventing the generation of burrs on the cut surface and peeling of the back surface layer, and cutting into a narrow strip lithographic printing plate material having a predetermined width, and a narrow strip lithographic printing plate material produced by this cutting method. An object of the present invention is to provide a rolled lithographic printing plate material that is wound straight around a winding core.

  The above object of the present invention has been achieved by the following constitution.

(Claim 1)
A wide belt-like planographic printing plate material having a hydrophilic layer and an image forming layer in this order on a long plastic film substrate that travels, and a back surface layer on the back surface, a disk-shaped upper blade that rotates in opposite directions to each other; Using at least one pair of rotary blades having a set with a drum-like lower blade, the wide belt-like lithographic printing plate material is held in the drum-like lower blade along the running direction, and at least two narrow-band lithographic plates In the cutting method to continuously cut into printing plate materials,
The scratch strength of the back layer is 100 to 350 g,
A method for cutting a wide strip lithographic printing plate material, wherein the back layer side is brought into contact with the upper blade side for cutting.

(Claim 2)
The cutting edge angle of the upper blade is 15 to 45 °, the cutting edge angle of the lower blade is 75 to 90 °, and the clearance between the upper blade and the lower blade is 0 to 15 with respect to the thickness of the wide strip lithographic printing plate material. The method for cutting a wide strip lithographic printing plate material according to claim 1, wherein:

(Claim 3)
The wide-band lithographic printing plate material is an on-press development type printing plate material containing a photothermal conversion material that converts near infrared rays into heat in at least one of a hydrophilic layer and a heat-sensitive image forming layer. A method for cutting a wide strip lithographic printing plate material according to claim 1 or 2.

(Claim 4)
The method for cutting a wide strip lithographic printing plate material according to any one of claims 1 to 3, wherein the height of burrs in the cut surface of the narrow strip lithographic printing plate material is 0 to 20 µm.

(Claim 5)
5. After cutting the wide strip lithographic printing plate material into at least two narrow strip lithographic printing plate materials by the cutting method according to any one of claims 1 to 4, the narrow strip lithographic printing plate material is wound around the core. A rolled lithographic printing plate material characterized in that it is in the form of a take-up roll.

(Claim 6)
The wide-band lithographic printing plate material has a hydrophilic layer and a heat-sensitive image forming layer on a plastic film substrate, and a back layer on the back surface, and at least one of the hydrophilic layer and the heat-sensitive image forming layer. The roll-type planographic printing plate material according to claim 5, which is an on-press development type printing plate material containing a photothermal conversion material that converts near infrared rays into heat.

(Claim 7)
The roll-shaped planographic printing plate material according to claim 5 or 6, wherein a burr height of a cut surface of the narrow strip-shaped planographic printing plate material is 0 to 20 µm.

  A wide-band lithographic printing plate material that has a hydrophilic layer and an image-forming layer in this order on a plastic film substrate, and has a back layer on the back side, and prevents burrs from occurring on the cut surface and peeling of the back layer. , A cutting method for cutting a narrow-width lithographic printing plate material of a predetermined width, and a roll-shaped lithographic printing plate material obtained by rolling the narrow-width lithographic printing plate material produced by this cutting method around a winding core As a result, the quality of the printing plate can be improved.

  Embodiments according to the present invention will be described with reference to FIGS. 1 to 6, but the present invention is not limited to these embodiments. An on-press development type lithographic printing plate material will be described with reference to FIG. 1 as an example of the lithographic printing plate material.

  FIG. 1 is a schematic view of a roll-on-machine development type printing plate material. FIG. 1A is a schematic perspective view of a roll-on-machine development type printing plate material. FIG. 1B is a schematic cross-sectional view taken along the line AA ′ of FIG.

  In the figure, reference numeral 1 denotes a roll-form on-press development type printing plate material. The roll-form on-machine development type printing plate material 1 is formed by winding a wide strip printing plate material cut to a predetermined width around a hollow cylindrical winding core 101 having a prescribed length and inner and outer diameters so that the image forming layer 106 side is the outer surface. It is made by installing. The roll-form on-press development type printing plate material shown in the figure is stored in the roll-form on-press development type printing plate material magazine (not shown) with the leading end 102 being put out. Then, a roll-form on-machine development type printing plate material magazine is mounted on the exposure apparatus, the tip is sandwiched and pulled out for a predetermined length, and cut in the exposure apparatus to form a sheet-form on-machine development type printing plate material. It is sent to the exposure unit and used.

  Reference numerals 103a and 103b denote flange members which have a diameter larger than the outer winding diameter of the roll-type on-machine development type printing plate material 1 and are attached to both ends of the hollow cylindrical winding core 101. 103a1 indicates an end side of the flange member 103a, and 103b1 indicates an end side of the flange member 103b. Reference numerals 103a2 and 13b2 denote outer surfaces of the flange members 103a2 and 13b2.

  Reference numeral 104 denotes a plastic film substrate, 105 denotes a hydrophilic layer provided on the plastic film substrate 104, and 106 denotes an image forming layer provided on the hydrophilic layer 105. At least one of the hydrophilic layer 105 and the image forming layer 106 has a function of converting laser light into heat. Reference numeral 107 denotes a back layer. Further, an antistatic layer may be provided on the image forming layer 106. The scratch strength of the back layer 107 is 100 to 350 g. When the scratch strength is less than 100 g, film peeling occurs in the cutting process, and when it is formed into a winding roll shape on the winding core, it is transferred to the image forming layer and printing stains are generated. When the scratch strength exceeds 350 g, the film thickness of the back surface layer is increased, causing a problem in registerability.

  The scratch strength was measured using a HEIDON-18 type scratch tester, and the needle was a five-cone type with a 0.1 mm radius at the tip. Apply load. The moving distance was 100 mm, the load was applied from 0 to 300 g, and the moving table was moved at a speed of 1000 mm / min. The load at which scratches occurred on the back layer was read and used as the scratch strength.

  The total thickness of the on-press development type printing plate material according to the present invention is preferably 150 to 300 μm. By setting the thickness of the on-press development type printing plate material in the above range, preferable characteristics as an on-press development type printing plate material can be obtained from the viewpoints of printability and handleability.

  When the total thickness is less than 150 μm, depending on the type of substrate, the mechanical strength as a printing plate becomes insufficient, and printing durability and dimensional accuracy may deteriorate. When the thickness exceeds 300 μm, depending on the type of substrate, the rigidity of the printing plate becomes high, the positional accuracy during exposure becomes poor, and good print quality may not be obtained.

  The thickness of the hydrophilic layer is preferably 0.5 to 10 μm. When the thickness is less than 0.5 μm, depending on the type of the hydrophilic layer, the film strength may be insufficient and the printing durability may be deteriorated. When the thickness exceeds 10 μm, the ink tends to adhere and print stains may occur in the non-image area.

  The thickness of the image forming layer is preferably 0.2 to 5 μm. When the thickness of the image forming layer is less than 0.2 μm, the printing durability may be deteriorated too much. If it exceeds 5 μm, the developability may deteriorate.

  The thickness of the back layer is preferably 0.2 to 5 μm. When the thickness is less than 0.2 μm, the mat material holding power may deteriorate. If it exceeds 5 μm, the registerability may deteriorate.

  It is preferable to provide an antistatic layer on the side of the substrate on which the hydrophilic layer is provided, on the opposite side, or on both sides. In the case where the antistatic layer is provided between the base material and the hydrophilic layer, it also contributes to an improvement in adhesion with the hydrophilic layer. An intermediate hydrophilic layer can also be provided between the substrate and the hydrophilic layer. Details of the on-roll development type printing plate material according to the present invention will be described later.

  FIG. 2 is a schematic view showing an example of a cutting method for continuously cutting the developing plate material on a wide strip machine on the developing plate material on a narrow strip machine by a cutting device.

  In the figure, reference numeral 2 denotes a wide belt-like on-machine development type printing plate material, and 3 denotes an original roll of the wide belt-like on-machine development type printing plate material 2. Reference numeral 4 denotes an upper blade portion, 401 denotes a disk-like upper blade (hereinafter also referred to as an upper blade), and 402 denotes a rotation shaft to which the upper blade 401 is attached. The number of upper blades 401 to be attached can be changed depending on the width to be cut, and all the upper blades 401 to be attached have the same shape, and FIG. Reference numeral 5 denotes a lower blade portion, and reference numeral 501 denotes a rotation shaft for rotating the lower blade portion 5. The cutting method shown in this figure is a cutting method using a rotating upper blade 401 and a lower blade 502 (see FIG. 3). Published by Japan Packaging Machinery Manufacturers Association Packaging Machinery and Mechanism (new edition) 1986 430-431 This is a so-called shear cut method as described on the page.

  Reference numeral 6 denotes a rolled lithographic printing plate material in which a cut narrow on-machine development type printing plate material 601 is wound around a winding core to form a roll. Reference numeral 7 denotes a roll which winds up unnecessary portions at both ends of the wide belt-like on-machine development type printing plate material 2 generated at the time of cutting.

  In the cutting shown in this figure, the case where the cutting is performed with the back surface layer of the wide belt-like on-machine development type printing plate material 2 being the upper blade 401 side is shown. The upper blade portion 4 and the lower blade portion 5 are pivotally attached to a cutting device frame (not shown in the figure) via bearings such as ball bearings, and the upper blade portion and the lower blade portion are separated from each other. It can be rotated by a motor not shown in the figure.

  The conveying speed of the wide strip lithographic printing plate material 2 is preferably 60 to 100 m / min. When the conveyance speed is less than 60 m / min, the amount of compressive deformation by the upper blade with respect to the wide belt-like lithographic printing plate material increases, and peeling of the back surface layer may increase. When the conveyance speed exceeds 100 m / min, the conveyance property of the wide belt-like lithographic printing plate material and the clearance of the upper blade and the lower blade become unstable, the cut surface becomes unstable, the back layer, the hydrophilic layer, The image forming layer may peel off or burrs may occur on the substrate.

  The peripheral speeds of the lower blade and the upper blade are preferably synchronized with the conveying speed of the wide belt-like lithographic printing plate material 2. For example, the peripheral speed of the upper blade is relative to the conveying speed of the wide belt-like lithographic printing plate material 2. 100% to 115%, and the peripheral speed of the lower blade is preferably 100% with respect to the conveying speed of the wide belt-like lithographic printing plate material 2.

  FIG. 3 is a schematic perspective view showing the relationship between the upper blade and the lower blade shown in FIG. However, in order to facilitate understanding of the relationship between the upper blade and the lower blade, the wide belt-like desktop development type printing plate material is removed.

  In the figure, reference numeral 502 denotes a blade portion (called a drum-like lower blade) attached to the attachment member 503 in a ring shape, 504 denotes a spacer member for determining a cutting width, and 505 denotes between the attachment member 503 and the spacer member 504. The escape part into which the upper blade 401 provided in FIG. The arrows indicate the rotation directions of the upper blade 401 and the drum-shaped lower blade 502 (hereinafter also referred to as the lower blade).

  4 is a schematic cross-sectional view taken along the line AA ′ of FIG.

  In the figure, θ1 indicates the edge angle of the upper blade 401, preferably 15 to 45 °, more preferably 20 to 40 °. If the angle is less than 15 °, the blade edge may be damaged depending on the blade material, the life of the blade may be shortened, and it may take time to replace and manage the blade, resulting in a decrease in production efficiency. If it exceeds 45 °, the amount of compressive deformation and shear stress of the wide belt-like desktop development type printing plate material during cutting may increase, and peeling of the image forming layer and the back layer may occur.

  θ2 represents the edge angle of the lower blade 502, and is preferably 75 to 90 °. When it is less than 75 °, the breaking point at the time of cutting goes to the upper blade side, becomes near the base material, and burrs may occur. When the angle exceeds 90 degrees, cracks from the lower blade are hardly formed at the time of cutting, and the breakage point becomes the image forming layer, so that the image forming layer may be peeled off. The blade edge angle θ1 of the upper blade 401 and the blade edge angle θ2 of the lower blade 502 are values measured by a loupe with a built-in protractor.

  Reference numeral 403 represents a mined surface of the upper blade 401, 404 represents an anti-mineral surface of the upper blade, 506 represents a mined surface of the lower blade 502, and 507 represents an anti-mineral surface. V indicates the clearance between the upper blade 401 and the lower blade 502 (the distance between the anti-mineral surface 404 of the upper blade and the mined surface 506 of the lower blade 502). The clearance V is preferably 0 to 15% with respect to the thickness of the belt-like lithographic printing plate material. When the clearance V exceeds 15% with respect to the thickness of the plastic film support, the difference in the position of cracks entering from the upper blade and the lower blade at the time of cutting becomes large and the breaking point shifts, so the cut surface becomes unstable. Thus, peeling of the hydrophilic layer, the image forming layer, the back surface layer, and burrs of the substrate may occur.

  X shows the overlap amount of the upper blade 401 and the lower blade 502, 0.1-1.0 mm is preferable, More preferably, it is 0.2-0.5 mm. If it is less than 0.1 mm, there is a risk that the upper blade will come off the escape portion 405 and ride on the lower blade. When it exceeds 1.0 mm, the sharpness may be poor. Y indicates the depth of the escape portion 505 and is 5.0 to 10 mm. Z shows the width | variety of the escape part 505, and is 1.5-3.0 mm.

  FIG. 5 is a schematic cross-sectional view showing a state in which the wide belt-like desktop development type printing plate material is cut by the upper blade and the lower blade shown in FIG. (A) of FIG. 5 is a schematic sectional drawing which shows the state at the time of a cutting start. FIG. 5B is a schematic cross-sectional view showing a state at the end of cutting.

  In the figure, 8 indicates a crack generated by the upper blade 401 entering, and 9 indicates a crack generated by the lower blade. Other symbols are the same as those in FIGS.

  As shown in this figure, cutting is performed in the case of a combination of an upper blade and a lower blade where the blade edge angle of the upper blade 401 is an acute angle of 15 to 45 ° and the blade edge angle of the lower blade is an obtuse angle of 75 to 90 °. Is estimated to progress at the following stages.

Since the cutting edge of the upper blade 401 has an acute angle, the cutting edge starts to enter the back layer with the amount of compressive deformation and shear stress applied to the wide belt-like desktop development type printing plate material 1 being small, and cutting is started. Cracks occur. On the other hand, since the amount of compressive deformation and shear stress are small, the occurrence of cracks from the lower blade 502 due to the amount of compressive deformation is small, so the break point where the cracks generated from the upper blade side and the cracks generated from the lower blade side meet is the lower blade. The cutting is finished in a state where it moves to the image forming layer side in contact with the image forming layer. That is, the upper blade 401 enters from the back surface layer 107 and starts cutting. At this time, since the blade edge angle of the upper blade 401 is an acute angle of 15 to 45 ° and the blade edge angle of the lower blade is an obtuse angle of 75 to 90 °, the wide belt-like desktop developing type printing plate material 1 by the upper blade 401 is used. Cutting starts with a small amount of compressive deformation and shear stress. For this reason, since the amount of compressive deformation of the back surface layer is small, even when the scratch strength of the back surface layer is 100 to 350 g, the cutting of the back surface layer is completed in a state where peeling from the plastic film substrate 104 does not occur. Since the breaking point is on the image forming layer side in contact with the lower blade, it is possible to suppress the occurrence of burrs on the base material 104. Further, since the amount of compressive deformation and the shear stress are small, it is possible to minimize peeling of the image forming layer.
FIG. 6 is an enlarged schematic cross-sectional view of a portion indicated by P in FIG.

  In the figure, reference numeral 104a denotes a burr generated when the plastic film substrate 104 is stretched at the time of cutting. T represents the height of the burr 104a from the surface of the image forming layer 106, and the height T is preferably 0 to 20 μm. When the height of the burrs exceeds 20 μm, the image forming layer may be damaged via a roller or a blanket to cause printing stains. Further, if the height of the burr is large, a conveyance failure may occur. The height of a burr | flash shows the value measured with the magnifier with a built-in scale.

  A method for cutting a wide belt-like on-machine development type printing plate material shown in FIGS. 1 to 6 of the present invention, explained using an on-press development type printing plate material as a lithographic printing plate material, and a roll produced by this cutting method The on-press development type printing plate material has the following effects.

  1) It is possible to prevent the occurrence of burrs on the cut surface and peeling of the film on the back layer, so that the image forming layer is not damaged by using a roller or a blanket, and printing stains are prevented, and the product is stable and produced. Improved mobility.

  2) Since it was possible to prevent film peeling of the back layer, there was no failure associated with adhesion of the peeled back layer to the image forming layer side, and the quality was stable.

  3) By preventing the occurrence of burrs on the cut surface, the transportability when feeding into the output device in the form of a development printing plate material on a roll-like machine is improved, the dimensional accuracy is stable, and the quality is stable. .

  The plastic substrate used in the present invention preferably has a thickness of 100 to 300 μm, particularly preferably 150 to 200 μm, from the viewpoint of stable transportability in the printing plate preparation apparatus and ease of handling as a printing plate. Further, the stretching step is performed with a temperature difference between the stretching temperatures of the front and back surfaces of 5 ° C. or less, preferably 3 ° C. or less, more preferably the same. Further, the moisture content of the support is 0.5% by mass or less. The support moisture content D is represented by the following formula.

D (water content%) = (w / W) × 100
(W is the mass of the support in a humidity control equilibrium under an atmosphere of 25 ° C. and 60% RH, and w is the water content of the support in a humidity control equilibrium under an atmosphere of 25 ° C. and 60% RH. Represents.)
The water content of the support is preferably 0.5% by mass or less, more preferably 0.01 to 0.5% by mass, and particularly preferably 0.01 to 0.3% by mass.

  Examples of the plastic film include polyethylene terephthalate, polyethylene naphthalate, polyimide, polyamide, polycarbonate, polysulfone, polyphenylene oxide, and cellulose esters. Particularly preferred are polyester films such as polyethylene terephthalate and polyethylene naphthalate.

It is preferable to provide an antistatic layer on the hydrophilic layer side, the opposite side, or both sides of the support. As the antistatic layer, a polymer layer in which metal oxide fine particles and a matting agent are dispersed can be used. Examples of the material of the metal oxide particles used for the antistatic layer include SiO ₂ , ZnO, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , MgO, BaO, MoO ₃ , V ₂ O _5, and these A composite oxide and / or a metal oxide further containing a different atom in these metal oxides can be given. These may be used alone or in combination. Preferred metal oxides are SiO ₂ , ZnO, SnO ₂ , Al ₂ O ₃ , TiO ₂ , In ₂ O ₃ , and MgO. The thickness of the antistatic layer is preferably 0.01 to 1 μm.

  The surface of these plastic films may be subjected to corona discharge treatment, flame treatment, plasma treatment, ultraviolet irradiation treatment or the like in order to ensure adhesion with the hydrophilic layer. Further, the substrate surface can be mechanically roughened by sand blasting, brush polishing or the like. It is also a preferred embodiment to provide an undercoat layer made of latex having a hydrophilic functional group or a water-soluble resin.

  The hydrophilic layer of the belt-like lithographic printing plate material according to the present invention contains a hydrophilic matrix structure having a porous structure. As the material for forming the hydrophilic layer matrix, an organic hydrophilic matrix obtained by crosslinking or pseudo-crosslinking an organic hydrophilic polymer, or a sol comprising hydrolysis or condensation reaction of polyalkoxysilane, titanate, zirconate or aluminate. -An inorganic hydrophilic matrix layer, a metal oxide or the like obtained by gel conversion is preferably used. In particular, metal oxide fine particles are preferably included, and examples thereof include colloidal silica, alumina sol, titania sol, and other metal oxide sols. The form of the metal oxide fine particles may be spherical, needle-like, feather-like, or any other form. The average particle diameter is preferably 3 to 100 nm, and several metals having different average particle diameters are used. Oxide fine particles can also be used in combination. The surface of the particles may be surface treated.

  The metal oxide fine particles can be used as a binder by utilizing the film forming property. The decrease in hydrophilicity is less than when an organic binder is used, and it is suitable for use in a hydrophilic layer. Of these, colloidal silica is particularly preferred. Colloidal silica has the advantage of high film-forming properties even under relatively low temperature drying conditions, and can provide good strength. The colloidal silica that can be used in the present invention preferably includes necklace-shaped colloidal silica, which will be described later, and fine particle colloidal silica having an average particle size of 20 nm or less, and the colloidal silica preferably exhibits alkalinity as a colloidal solution.

  In the present invention, porous metal oxide particles having a particle size of less than 1 μm can be contained as a porous material having a hydrophilic layer matrix structure. As the porous metal oxide particles, the following porous silica, porous aluminosilicate particles, or zeolite particles can be preferably used. The porous silica particles are generally produced by a wet method or a dry method. In the wet method, the gel obtained by neutralizing the aqueous silicate solution can be obtained by drying and pulverizing, or by pulverizing the precipitate deposited by neutralization. In the dry method, silicon tetrachloride is burned together with hydrogen and oxygen to obtain silica. These particles can be controlled in their porosity and particle size by adjusting the production conditions. As the porous silica particles, those obtained from a wet gel are particularly preferable.

  The porosity of the particles is preferably 0.5 ml / g or more in terms of pore volume, more preferably 0.8 ml / g or more, and further preferably 1.0 to 2.5 ml / g. preferable. The pore volume is closely related to the water retention of the coating film. The larger the pore volume, the better the water retention, the less likely to get dirty during printing, and the greater the water volume latitude, but more than 2.5 ml / g When it becomes large, the particles themselves become very brittle, so that the durability of the coating film is lowered. Conversely, if the pore volume is less than 0.5 ml / g, the printing performance may be insufficient.

  Zeolite is a crystalline aluminosilicate and is a porous body having regular three-dimensional network voids having a pore diameter of 0.3 to 1 nm. The general formula combining natural and synthetic zeolite is expressed as follows:

_{(M1, (M2) 0.5)} m (Al m Si n O 2) (m + n) · xH 2 O
Here, M1 and M2 are exchangeable cations, and M1 is Li ⁺ , Na ⁺ , K ⁺ , Tl ⁺ , Me ₄ N ⁺ (TMA), Et ₄ N ⁺ (TEA), Pr ₄ N ⁺ ( TPA), C ₇ H ₁₅ N ₂ ⁺ , C ₈ H ₁₆ N + and the like, and M2 is Ca ²⁺ , Mg ²⁺ , Ba ²⁺ , Sr ²⁺ , C ₈ H ₁₈ N ₂ ^{2+ and the} like. Further, n ≧ m, and the value of m / n, that is, the Al / Si ratio is 1 or less. The higher the Al / Si ratio, the greater the amount of exchangeable cations, and thus the higher the polarity and therefore the higher the hydrophilicity. A preferable Al / Si ratio is 0.4 to 1.0, and more preferably 0.8 to 1.0. x represents an integer.

The zeolite particles used in the present invention are preferably synthetic zeolite having a stable Al / Si ratio and a relatively sharp particle size distribution. For example, zeolite A: Na ₁₂ (Al ₁₂ Si ₁₂ O ₄₈ ). 27H ₂ O; Al / Si ratio 1.0, zeolite X: Na ₈₆ (Al ₈₆ Si ₁₀₆ O ₃₈₄ ) · 264H ₂ O; Al / Si ratio 0.811, zeolite Y: Na ₅₆ (Al ₅₆ Si ₁₃₆ O ₃₈₄ 250H ₂ O; Al / Si ratio 0.412 and the like.

  By containing highly hydrophilic porous particles having an Al / Si ratio of 0.4 to 1.0, the hydrophilicity of the hydrophilic layer itself is greatly improved, it is difficult to get dirty during printing, and the water latitude is widened. In addition, the dirt on the fingerprint marks is greatly improved. When the Al / Si ratio is less than 0.4, the hydrophilicity is insufficient, and the effect of improving the performance becomes small.

  Further, the hydrophilic layer matrix structure of the belt-like lithographic printing plate material according to the present invention can contain layered clay mineral particles. Examples of the layered mineral particles include kaolinite, halloysite, talc, smectite (montmorillonite, beidellite, hectorite, sabonite, etc.), clay minerals such as vermiculite, mica (mica), chlorite, hydrotalcite, layered polysilicic acid. Examples thereof include salts (kanemite, macatite, ialite, magadiite, kenyaite, etc.). In particular, the higher the charge density of the unit layer (unit layer), the higher the polarity and the higher the hydrophilicity. The charge density is preferably 0.25 or more, more preferably 0.6 or more. Examples of the layered mineral having such a charge density include smectite (charge density 0.25 to 0.6; negative charge), vermiculite (charge density 0.6 to 0.9; negative charge) and the like. In particular, synthetic fluoromica is preferable because it can be obtained with stable quality such as particle size. Among the synthetic fluorine mica, those that are swellable are preferable, and those that are free swell are more preferable.

  Also used are intercalation compounds of the above-mentioned layered minerals (pillar crystals, etc.), those subjected to ion exchange treatment, and those subjected to surface treatment (silane coupling treatment, compounding treatment with organic binder, etc.) can do.

  As the size of the flat lamellar mineral particles, the average particle diameter (maximum length of the particles) is less than 1 μm in the state of being contained in the layer (including the case where the swelling process and the dispersion peeling process have been performed). The aspect ratio is preferably 50 or more. When the particle size is in the above range, the continuity and flexibility in the planar direction, which are the characteristics of the thin layered particles, are imparted to the coating film, and it is difficult for cracks to occur, and a tough coating film can be obtained in a dry state. Moreover, in the coating liquid containing many particulate matters, sedimentation of particulate matter can be suppressed by the thickening effect of the layered clay mineral. When the particle diameter is larger than the above range, the coating film may be non-uniform, and the strength may be locally reduced. On the other hand, when the aspect ratio is not more than the above range, the number of tabular grains with respect to the addition amount is reduced, the viscosity is insufficient, and the effect of suppressing sedimentation of the particulate matter is reduced.

  The content of the layered mineral particles is preferably 0.1 to 30% by mass, and more preferably 1 to 10% by mass based on the entire layer. In particular, swellable synthetic fluorinated mica and smectite are preferable because they are effective even when added in a small amount. The layered mineral particles may be added as a powder to the coating solution, but in order to obtain a good degree of dispersion even with a simple preparation method (no need for a dispersion step such as media dispersion), the layered mineral particles are used alone. It is preferable to prepare the gel swollen in water and add it to the coating solution.

A silicate aqueous solution can also be used as another additive material in the hydrophilic layer matrix of the strip-like lithographic printing plate material according to the present invention. Alkali metal silicates such as silicate Na, silicate K, and silicate Li are preferred, and the SiO ₂ / M ₂ O ratio is in a range where the pH of the entire coating solution does not exceed 13 when silicate is added. It is preferable to select such that the inorganic particles are not dissolved.

  Further, an inorganic polymer or an organic-inorganic hybrid polymer using a metal alkoxide by a so-called sol-gel method can also be used. The formation of an inorganic polymer or an organic-inorganic hybrid polymer by the sol-gel method is described in, for example, “Application of the sol-gel method” (Sakuo Sakuo / Agne Jofusha) or is described in this document. Known methods described in the cited documents can be used.

  Moreover, you may contain water-soluble resin in the hydrophilic layer of the strip | belt-shaped planographic printing plate material concerning this invention. Examples of water-soluble resins include polysaccharides, polyethylene oxide, polypropylene oxide, polyvinyl alcohol, polyethylene glycol (PEG), polyvinyl ether, styrene-butadiene copolymer, and conjugated diene polymer latex of methyl methacrylate-butadiene copolymer. Examples thereof include resins such as acrylic polymer latex, vinyl polymer latex, polyacrylamide, sodium polyacrylate, and polyvinyl pyrrolidone. As the water-soluble resin used in the present invention, it is preferable to use a polysaccharide.

  As polysaccharides, starches, celluloses, polyuronic acids, pullulans and the like can be used, but cellulose derivatives such as methyl cellulose salts, carboxymethyl cellulose salts, hydroxyethyl cellulose salts are particularly preferable, and sodium salts and ammonium salts of carboxymethyl cellulose are preferable. More preferred. This is because an effect of forming the surface shape of the hydrophilic layer in a preferable state can be obtained by including the polysaccharide in the hydrophilic layer.

  The surface of the hydrophilic layer preferably has a concavo-convex structure with a pitch of 0.1 to 20 μm like the aluminum grain of the PS plate, and this concavo-convex improves water retention and image area retention. Such a concavo-convex structure can be formed by adding an appropriate amount of a filler having an appropriate particle size to the hydrophilic layer matrix. However, the above-mentioned alkaline colloidal silica and the above-mentioned water-soluble solution are added to the hydrophilic layer coating solution. It is preferable that a structure having better printability can be obtained by forming a phase separation when the hydrophilic polysaccharide is applied and dried.

  The shape of the concavo-convex structure (such as pitch and surface roughness) is determined by the type and amount of alkaline colloidal silica, the type and amount of water-soluble polysaccharides, the type and amount of other additives, the solid content concentration of the coating solution, and the wetness. It is possible to appropriately control the film thickness, drying conditions, and the like.

  As the inorganic particles that can be used in the present invention, for example, known metal oxide particles such as silica, alumina, titania, zirconia, etc. can be used, but in order to suppress sedimentation in the coating solution, it is porous. Preferably, metal oxide particles are used. As the porous metal oxide particles, the aforementioned porous silica particles and porous aluminosilicate particles can be preferably used.

  Examples of the particles coated with an inorganic material include particles in which organic particles such as polymethyl methacrylate and polystyrene are used as a core material, and the particles are coated with inorganic particles having a particle diameter smaller than that of the core material particles. The particle size of the inorganic particles is preferably about 1/10 to 1/100 of the core particles. As the inorganic particles, known metal oxide particles such as silica, alumina, titania, zirconia, etc. can be used. As the coating method, various known methods can be used, but the core material particles and the coating material particles are collided at high speed in the air like a hybridizer to cause the coating material particles to bite into the surface of the core material particles. A dry coating method of fixing and coating can be preferably used.

  Moreover, the particle | grains which carried out the metal plating of the core material of an organic particle can also be used. Examples of such particles include “Micropearl AU” manufactured by Sekisui Chemical Co., Ltd., in which resin particles are plated with gold.

  The particle size is 1 μm or more and it is necessary to satisfy the relationship of the formula (1) defined in the present invention with respect to the average film thickness of the hydrophilic matrix structure, but 1 to 10 μm is preferable, and 1.5 to 8 micrometers is more preferable and 2 micrometers-6 micrometers are still more preferable. When the particle diameter exceeds 10 μm, there is a concern that the resolution of image formation is reduced and the blanket stain is deteriorated. In the present invention, the amount of particles having a particle diameter of 1 μm or more is appropriately adjusted so as to satisfy the surface morphology parameters according to the present invention, but is preferably 1 to 50% by mass of the entire hydrophilic layer. 5 to 40% by mass is more preferable. The hydrophilic layer as a whole preferably has a low content ratio of materials containing carbon such as organic resin and carbon black in order to improve hydrophilicity, and the total of these materials is preferably less than 9% by mass. More preferably, it is less than 5 mass%.

  An intermediate hydrophilic layer can be provided between the substrate and the hydrophilic layer. As the material used for the intermediate hydrophilic layer, the same material as the hydrophilic layer can be used. However, the intermediate hydrophilic layer is less advantageous in that it is porous, and more nonporous is preferable from the viewpoint of coating strength. The content of the porous material forming the hydrophilic matrix structure is preferably less than the hydrophilic layer, and more preferably not contained.

  The addition amount of the particles having a particle size of 1 μm or more used in the intermediate hydrophilic layer is appropriately adjusted so as to satisfy the surface morphology parameter according to the present invention, but is 1 to 50% by mass of the entire intermediate hydrophilic layer. It is preferable that it is 5 to 40% by mass.

  Similarly to the hydrophilic layer, the intermediate hydrophilic layer as a whole is preferably low in content ratio of materials containing carbon such as organic resin and carbon black in order to improve hydrophilicity, and the total of these materials is 9 mass. % Is preferable, and it is more preferable that it is less than 5% by mass.

  A photothermal conversion material can be contained in the hydrophilic layer, intermediate hydrophilic layer and other layers of the on-press development type printing plate material according to the present invention. As the photothermal conversion material, it is preferable to use an infrared absorbing dye, an inorganic / organic pigment, a metal, or a metal oxide, and specific examples thereof include the following materials.

  Infrared absorbing dyes include cyanine dyes, croconium dyes, polymethine dyes, azurenium dyes, squalium dyes, thiopyrylium dyes, naphthoquinone dyes, anthraquinone dyes and other organic compounds, phthalocyanine dyes, naphthalocyanine dyes, Examples include azo-based, thioamide-based, dithiol-based, and indoaniline-based organometallic complexes. Specifically, JP-A-63-139191, JP-A-64-33547, JP-A-1-160683, JP-A-1-280750, JP-A-1-293342, JP-A-2-2074, Kaihei 3-26593, JP-A-3-30991, JP-A-3-34891, JP-A-3-36093, JP-A-3-36094, JP-A-3-36095, JP-A-3-42281, JP-A-3-42281 Examples thereof include compounds described in JP-A-3-97589, JP-A-3-103476, and the like. These can be used alone or in combination of two or more.

  Examples of the pigment include carbon, graphite, metal, metal oxide and the like. As carbon, it is particularly preferable to use furnace black or acetylene black. The particle size (d50) is preferably 100 nm or less, and more preferably 50 nm or less.

  As the graphite, fine particles having a particle size of 0.5 μm or less, preferably 100 nm or less, more preferably 50 nm or less can be used.

  As the metal, any metal can be used as long as the particle diameter is 0.5 μm or less, preferably 100 nm or less, more preferably 50 nm or less. The shape may be any shape such as a spherical shape, a piece shape, or a needle shape. Colloidal metal fine particles (Ag, Au, etc.) are particularly preferable.

As the metal oxide, a material that is black in the visible light region, or a material that has conductivity or is a semiconductor can be used. Examples of the former include black iron oxide (Fe ₃ O ₄ ) and black composite metal oxides containing two or more of the aforementioned metals. Examples of the latter include Sb-doped SnO ₂ (ATO), Sn-added In ₂ O ₃ (ITO), TiO ₂ , TiO ₂ reduced TiO (titanium oxynitride, generally titanium black) Etc. These metal oxides are coated with a core material (BaSO ₄ , TiO ₂ , 9Al ₂ O ₃ .2B ₂ O, K ₂ O.nTiO _2, etc.). Conversely, the surface of the metal oxide particles is hydrophilic. Those coated with a compound can also be used. These particle sizes are 0.5 μm or less, preferably 100 nm or less, and more preferably 50 nm or less.

Among these photothermal conversion materials, black iron oxide (Fe ₃ O ₄ ), which is a metal oxide, and a black composite metal oxide containing two or more metals are more preferable materials. If the specific example of complex oxide is given, it will be a complex metal oxide which consists of two or more sorts of metals chosen from Al, Ti, Cr, Mn, Fe, Co, Ni, Cu, Zn, Sb, and Ba. These are disclosed by methods disclosed in JP-A-8-27393, JP-A-9-25126, JP-A-9-237570, JP-A-9-241529, JP-A-10-231441, and the like. Can be manufactured.

  The composite metal oxide is particularly preferably a Cu-Cr-Mn-based or Cu-Fe-Mn-based composite metal oxide. In the case of a Cu—Cr—Mn system, it is preferable to perform the treatment disclosed in JP-A-8-27393 in order to reduce the elution of hexavalent chromium. These composite metal oxides are colored with respect to the amount added, that is, they have good photothermal conversion efficiency.

  These metal oxide photothermal conversion materials preferably have an average primary particle diameter of 1 μm or less, and more preferably have an average primary particle diameter in the range of 0.01 to 0.5 μm. When the average primary particle diameter is 1 μm or less, the photothermal conversion ability with respect to the addition amount becomes better, and when the average primary particle diameter is within the range of 0.01 to 0.5 μm, the photothermal conversion ability with respect to the addition amount is better. It becomes. However, the photothermal conversion ability with respect to the addition amount is greatly affected by the degree of dispersion of the particles, and the better the dispersion, the better. Therefore, these metal oxide light-to-heat conversion materials are preferably dispersed by a known method before being added to the layer coating solution to prepare a dispersion (paste). When the average primary particle size is less than 0.01, it is not preferable because dispersion becomes difficult. A dispersing agent can be appropriately used for the dispersion. The addition amount of the dispersant is preferably 0.01 to 5% by mass, and more preferably 0.1 to 2% by mass with respect to the metal oxide particles.

  As addition amount of these metal oxides, it is 0.1-60 mass% with respect to a hydrophilic layer or a lower layer, 3-60 mass% is preferable, and 3-45 mass% is more preferable. The addition amount of the photothermal conversion material may be different between the hydrophilic layer and the intermediate hydrophilic layer.

  The image forming method using the belt-like lithographic printing plate material according to the present invention may be any known method, and examples thereof include a photopolymerization type and a photothermal conversion type. The composition used is included. However, as the image forming method, in order to reduce the burden on the global environment, a type in which a printing plate material is developed on-press and does not require a wet development process using a special agent is preferable. The on-machine development type is divided into an ablation type and an on-machine development type, but the on-machine development type is more preferable from the viewpoint of apparatus cost and the like. As a typical method, there is a photothermal conversion image forming method using heat melting and / or heat fusible particles.

  The heat-meltable fine particles are fine particles formed of a material that has a low viscosity when melted, and is generally classified as a wax, among thermoplastic materials. The physical properties are preferably a softening point of 40 ° C. or higher and 120 ° C. or lower, a melting point of 60 ° C. or higher and 100 ° C. or lower, more preferably a softening point of 40 ° C. or higher and 100 ° C. or lower, and a melting point of 60 ° C. or higher and 120 ° C. or lower. When the melting point is less than 60 ° C., storage stability is a problem, and when the melting point is higher than 300 ° C., ink deposition sensitivity is lowered. Examples of usable materials include paraffin wax, polyolefin, polyethylene wax, microcrystalline wax, carnauba wax, candelilla wax, montan wax, and fatty acid wax. These have a molecular weight of about 800 to 10,000, and 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. Furthermore, in order to lower the softening point and improve the workability, these waxes include, for example, stearamide, linolenamide, laurylamide, myristamide, hardened bovine fatty acid amide, palmitoamide, oleic acid amide, rice sugar fatty acid amide, It is also possible to add coconut fatty acid amides or methylolated products of these fatty acid amides, methylene bisstellaramide, ethylene bisstellaramide and the like. Coumarone-indene resin, rosin-modified phenol resin, terpene-modified phenol resin, xylene resin, ketone resin, acrylic resin, ionomer, and copolymers of these resins can also be used.

  Among these, it is preferable to contain any one of polyethylene wax, microcrystalline wax, carnauba wax, fatty acid ester, and fatty acid. Since these materials have a relatively low melting point and a low melt viscosity, high-sensitivity image formation can be performed. Further, since these materials have lubricity, damage when a shearing force is applied to the surface of the on-press development type printing plate material is reduced, and resistance to printing stains due to scratches or the like is improved.

  The heat-meltable fine particles are preferably dispersible in water, and the average particle size is preferably 0.01 to 10 μm, more preferably 0.1 to 3 μm. When the average particle size is smaller than 0.01 μm, when the coating liquid for the layer containing the heat-meltable fine particles is applied onto the porous hydrophilic layer described later, the heat-meltable fine particles are not removed from the pores of the hydrophilic layer. It becomes easy to enter inside or into the gaps between fine irregularities on the surface of the hydrophilic layer, and the on-press development becomes insufficient, which may cause scumming. When the average particle size of the heat-meltable fine particles is larger than 10 μm, the resolution is lowered.

  Further, the composition of the heat-meltable fine particles may vary continuously between the inside and the surface layer, or may be coated with a different material. As a coating method, a known microcapsule formation method, a sol-gel method, or the like can be used. As content of the heat-meltable microparticles | fine-particles in a structural layer, 1-90 mass% of the whole layer is preferable, and 5-80 mass% is more preferable. Examples of the heat-fusible fine particles include thermoplastic hydrophobic polymer fine particles, and there is no specific upper limit for the softening temperature of the thermoplastic hydrophobic polymer fine particles. It is preferably lower than the decomposition temperature. Moreover, it is preferable that the weight average molecular weight (Mw) of a high molecular weight polymer is the range of 10,000-1,000,000.

  Specific examples of the polymer constituting the polymer particles include, for example, diene (co) polymers such as polypropylene, polybutadiene, polyisoprene and ethylene-butadiene copolymer, styrene-butadiene copolymer, Synthetic rubbers such as methyl methacrylate-butadiene copolymer, acrylonitrile-butadiene copolymer, polymethyl methacrylate, methyl methacrylate- (2-ethylhexyl acrylate) copolymer, methyl methacrylate-methacrylic acid copolymer, methyl acrylate- ( N-methylolacrylamide) copolymer, (meth) acrylic acid ester such as polyacrylonitrile, (meth) acrylic acid (co) polymer, polyvinyl acetate, vinyl acetate-vinyl propionate copolymer, vinyl acetate-ethylene copolymer Vinyl etc. of polymers Ester (co) polymer, vinyl acetate - (2-ethylhexyl acrylate) copolymers, polyvinyl chloride, polyvinylidene chloride, polystyrene and copolymers thereof. Of these, (meth) acrylic acid esters, (meth) acrylic acid (co) polymers, vinyl ester (co) polymers, polystyrene, and synthetic rubbers are preferably used.

  The polymer polymer fine particles may be composed of a polymer polymer polymerized by any known method such as an emulsion polymerization method, a suspension polymerization method, a solution polymerization method, and a gas phase polymerization method. As a method of microparticulating a polymer polymer polymerized by a solution polymerization method or a gas phase polymerization method, a method of spraying a solution in an organic solvent of the polymer polymer into an inert gas and drying to form particles, Examples thereof include a method in which a high molecular weight polymer is dissolved in a water-immiscible organic solvent, this solution is dispersed in water or an aqueous medium, and the organic solvent is distilled off to form fine particles. In any of the methods, the heat-meltable fine particles and the heat-fusible fine particles may be used as a dispersant or a stabilizer, for example, when polymerized or finely divided, such as sodium lauryl sulfate, sodium dodecylbenzenesulfonate, polyethylene. A surfactant such as glycol or a water-soluble resin such as polyvinyl alcohol may be used. Further, triethylamine, triethanolamine or the like may be contained.

  The thermoplastic fine particles are preferably dispersible in water, and the average particle diameter is preferably 0.01 to 10 μm, more preferably 0.1 to 3 μm. When the average particle size is smaller than 0.01 μm, when the coating liquid for the layer containing the heat-meltable fine particles is applied onto the porous hydrophilic layer described later, the heat-meltable fine particles are not removed from the pores of the hydrophilic layer. It becomes easy to enter inside or into the gaps between fine irregularities on the surface of the hydrophilic layer, and the on-press development becomes insufficient, which may cause scumming. When the average particle size of the heat-meltable fine particles is larger than 10 μm, the resolution is lowered. The thermoplastic fine particles may be continuously coated with different materials or the composition of the inside and the surface layer may be changed. As a coating method, a known microcapsule formation method, a sol-gel method, or the like can be used. As content of the thermoplastic fine particle in a structure layer, 1-90 mass% of the whole layer is preferable, and 5-80 mass% is further more preferable.

  The image-forming functional layer containing the heat-fusible and / or heat-fusible fine particles according to the present invention can further contain a water-soluble material. By including the water-soluble material, when the image forming functional layer in the unexposed area is removed using dampening water or ink on the printing press, the removability can be improved.

  As the water-soluble material, the water-soluble resins mentioned as materials that can be contained in the hydrophilic layer can also be used. However, as the image forming functional layer of the present invention, it is preferable to use saccharides, particularly oligosaccharides. Is preferred. Among oligosaccharides, trehalose is commercially available in a relatively high purity state at a low cost, and despite its high solubility in water, its hygroscopicity is very low, and on-press developability and The storage stability is very good.

  In addition, when oligosaccharide hydrate is melted by heat to remove water of hydration and then solidified (for a short time after solidification), it becomes an anhydrous crystal, but trehalose has a melting point of anhydride higher than that of hydrate. It is characteristic that it is higher than 100 ° C. This means that the exposed portion is melted by infrared exposure and immediately after re-solidification, the exposed portion is in a state of being difficult to melt at a high melting point, and is effective in causing image defects during exposure such as banding. In order to achieve the object of the present invention, trehalose is particularly preferable among oligosaccharides. As content of the oligosaccharide in a structure layer, 1-90 mass% of the whole layer is preferable, and 10-80 mass% is more preferable.

  A nonaqueous solvent may be contained in the image forming layer coating solution. Nonaqueous solvents include alcohols, ketones, amides, esters, hydrocarbon carbonates, and lactones. Moreover, you may contain an acetylene type surfactant.

A back coat layer may be formed on the back surface of the roll-shaped printing material according to the present invention in order to obtain desired smoothness and static friction coefficient. In addition to the binder component and the mat material, it is preferable to add a compound that imparts surface lubricity and conductivity to the back coat layer.
Binders include gelatin, polyvinyl alcohol, methyl cellulose, nitrocellulose, acetyl cellulose, aromatic polyamide resin, silicone resin, epoxy resin, alkyd resin, phenol resin, melamine resin, fluorine resin, polyimide resin, urethane resin, acrylic resin, urethane Modified silicone resin, polyethylene resin, polypropylene resin, Teflon (registered trademark) resin, polyvinyl butyral resin, vinyl chloride resin, polyvinyl acetate, polycarbonate, organic boron compounds, aromatic esters, fluorinated polyurethane, polyethersulfone, polyester resin A general-purpose polymer such as a polyamide resin, a polystyrene resin, or a copolymer mainly composed of these monomers can be used.

  The use of a crosslinkable binder as the binder is effective for preventing the mat material from falling off and improving the scratch resistance of the backcoat. It is also very effective for blocking during storage. This cross-linking means can be employed without any particular limitation on any one or combination of heat, actinic rays and pressure according to the characteristics of the cross-linking agent used. Depending on the case, in order to provide the adhesiveness to a base material, you may provide arbitrary easy-adhesion layers in the side which provides the backcoat layer of a base material.

  As the mat material preferably added to the back coat layer, organic or inorganic fine particles can be used. Examples of the organic fine particles include organic fine particles made of a resin such as a silicone resin, a fluororesin, an acrylic resin, a methacrylic resin, and a melamine resin. Among these, a silicone resin, an acrylic resin, and a methacrylic resin are preferable. Examples thereof include polymethyl methacrylate (PMMA), polystyrene resin, polyethylene resin, polypropylene resin, fine particles of other radical polymerization polymers, and fine particles of condensation polymers such as polyester and polycarbonate. Examples of the inorganic fine particles include inorganic fine particles such as silicon oxide, calcium carbonate, titanium dioxide, aluminum oxide, zinc oxide, barium sulfate, and zinc sulfate. Among these, titanium dioxide, calcium carbonate, and silicon oxide are preferable.

  The average particle size of the inorganic fine particles is preferably 0.5 to 10 μm, and more preferably 0.8 to 5 μm. When the average particle size is less than 0.5 μm, the back coat layer cannot be sufficiently roughened, and a long-time decompression is required to obtain uniform adhesion. If it exceeds 10 μm, the back coat layer is too rough and the smoother value becomes large, and stable adhesion to the fixing member cannot be ensured.

The plastic film substrate is preferably provided with a back layer at a weight of about 0.5 to 3 g / m ² . If it is less than 0.5 g / m ² , the coating property is unstable, and problems such as powdering off of the mat material are likely to occur. Also, if it is applied greatly exceeding 3 g / m ² , the particle size of a suitable mat material becomes very large, and embossing on the image receiving surface by the back coat layer occurs during storage, resulting in missing or uneven recording images. It becomes easy. When the matting agent is not added, the amount of the back coat layer is preferably 0.01 to 1.0 g / m ² .

  As content of the said microparticles | fine-particles, 0.5-80 mass% is preferable with respect to the total solid content mass of a backcoat layer, and 1-20 mass% is more preferable. When the content is less than 0.5% by mass, the back coat layer surface may not be sufficiently roughened. When the content exceeds 80% by mass, the back coat layer is too rough and smooth. The image value may increase and the image quality may deteriorate.

  For the purpose of adjusting the surface slipperiness, it is also preferable to add various surfactants, silicon oil, fluorine-based resins, waxes and the like to the back coat layer.

  An antistatic agent can also be added to prevent on-machine development type printing plate material from being transported abnormally due to frictional charging in the transport path and from adhering foreign matter due to charging. As the antistatic agent, cationic surfactants, anionic surfactants, nonionic surfactants, polymer antistatic agents, conductive fine particles and the like can be used. Among these, fine particles of metal oxides such as carbon black, graphite, tin oxide, zinc oxide and titanium oxide, and conductive fine particles such as organic semiconductors are preferably used. In particular, it is preferable to use fine particles of carbon black and graphite, particularly metal oxide, because a stable antistatic ability can be obtained regardless of environmental influences such as temperature.

Examples of the material of the metal oxide fine particles include SiO ₂ , ZnO, TiO ₂ , SnO ₂ , Al ₂ O ₃ , In ₂ O ₃ , MgO, BaO, MoO ₃ , V ₂ O ₅ and composite oxides thereof, and Examples of the metal oxide further include a metal oxide containing a different atom. These may be used alone or in combination. Among these, preferable metal oxides are SiO ₂ , ZnO, SnO ₂ , Al ₂ O ₃ , TiO ₂ , In ₂ O ₃ , and MgO. As an example containing a small amount of hetero atoms, Al or In with respect to ZnO, Sb, Nb or halogen elements with respect to SnO ₂ , and hetero atoms such as Sn with respect to In ₂ O ₃ of 30 mol% or less, preferably 10 What doped the quantity below mol% can be mentioned.

  The metal oxide fine particles are preferably contained in the back coat layer in the range of 10 to 90% by mass. The average particle diameter of the metal oxide fine particles is preferably in the range of 0.001 to 0.5 μm. The average particle size here is a value including not only the primary particle size of the metal oxide fine particles but also the particle size of the higher order structure.

It is more preferable that the on-press development type printing plate material has a layer or a substrate having a surface specific resistance of 108 to 1012 Ω / m ^{2 at} a relative humidity of 80% or less. As the antistatic agent that can be used, various surfactants and conductive agents can be appropriately used so that the surface specific resistance of the layer at a relative humidity of 80% or less is 108 to 1012 Ω / m ² . In particular, it is preferable to design the layer so that the surface specific resistance is 10 ⁸ to 10 ¹² Ω / m ² by containing at least one of carbon black, carbon graphite, and metal oxide fine particles in the layer.

  When performing laser exposure at the time of image formation, in order to prevent the focus from deviating, it is preferable to perform reduced pressure adhesion in combination with a known method for fixing the plastic film substrate. The surface roughness (Rz) when a matting agent is added to a base material or back coat layer whose back surface is roughened for the purpose of preventing blocking or imparting good vacuum adhesion is 0.04 to 5.00 μm. The range of is preferable.

  The smooth star value of the back surface of the belt-like lithographic printing plate material according to the present invention is preferably 0.06 MP or less, more preferably in the range of 0.0003 MP to 0.06 MP. In the case of 0.0003 MP or less, the uniform adhesion to the fixing member is deteriorated or the time required for stable adhesion is increased. When it is larger than 0.06 MP, the fixing onto the fixing member is insufficient and stable image exposure cannot be performed.

  The coefficient of static friction between the back surface of the belt-like planographic printing plate material and the fixed member surface is preferably 0.2 to 0.6. Even in the case of 0.2 or less or 0.6 or more, the fixing position accuracy on the fixing member is lowered, which is not preferable.

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

Example 1
<< Production of polyethylene terephthalate (PET) substrate >>
Polyethylene terephthalate (PET) was produced as a plastic film substrate. Using terephthalic acid and ethylene glycol, PET of IV (inherent viscosity) = 0.66 (measured in phenol / tetrachloroethane = 6/4 (mass ratio) at 25 ° C.) was obtained according to a conventional method. This was pelletized, dried at 130 ° C. for 4 hours, melted at 300 ° C., extruded from a T-die, rapidly cooled on a cooling drum at 50 ° C. and heat-set, and stretched biaxially to obtain a thickness. A PET substrate having a length of 175 μm, a length of 1500 m, and a width of 1200 mm was produced. The water content was 0.2% by mass. In addition, a moisture content is the value calculated | required by calculation from the following formula.

Moisture content% = (W1 / W2) × 100
In the formula, W2 represents the mass of the support in a humidity adjustment equilibrium under an atmosphere of 25 ° C. and 60% RH, and W1 represents the water content of the support in a humidity adjustment equilibrium under an atmosphere of 25 ° C. and 60% RH. .

<< Undercoating treatment of PET base material >>
After applying a corona discharge treatment of 8 W / m ² · min on both sides of the PET substrate obtained above, and then coating the following undercoat coating liquid a on one side so that the dry film thickness is 0.8 μm. While performing corona discharge treatment (8 W / m ² · min), the undercoating liquid b was applied to a dry film thickness of 0.1 μm and dried at 180 ° C. for 4 minutes (undercoating surface A). Also, after coating the following undercoat coating solution c on the opposite side so as to have a dry film thickness of 0.8 μm, the undercoat coating solution d is dried film thickness 1 while performing corona discharge treatment (8 W / m ² · min). The coating was applied to a thickness of 0.0 μm and dried at 180 ° C. for 4 minutes (undercoating surface B) to prepare a PET substrate. Further, when the surface roughness of the surface on the undercoat surface B side was measured, the Ra value was 0.8 μm. The ratio of each additive of the undercoat coating liquid a, the undercoat coating liquid b, the undercoat coating liquid c, and the undercoat coating liquid d indicates mass%.

<< 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 0.20%
Mat material (silica, average particle size 3.5 μm) 0.02%
Antifungal agent F-1 0.01%
Water 98.72%

<< 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-11 / component d-12 / component d-13 = 66/31/1
6.4%
Hardener H-2 0.7%
Anionic surfactant S-1 0.07%
Mat material (silica, average particle size 3.5 μm) 0.03%
Water 93.4%
Component d-11: Anionic polymer compound comprising a copolymer of sodium styrenesulfonate / maleic acid = 50/50 Component d-12: Three-component system comprising styrene / glycidyl methacrylate / butyl acrylate = 40/40/20 Copolymer latex component d-13: high molecular weight activator comprising styrene / sodium isoprenesulfonate = 80/20

<< Formation of hydrophilic layer and image forming layer >>
On the undercoating surface A of the above-described undercoated PET substrate, a coating solution for hydrophilic layer 1 (preparation method is shown below), a coating solution for hydrophilic layer 2 (preparation method is shown below), and image formation Using a layer coating solution (the preparation method is described below), coating was performed on each A-side of the sublimated substrate using a wire bar. The order of coating, first, the hydrophilic layer 1 onto a PET substrate, each dry coating weight using a wire bar in the order of hydrophilic layer 2 is 2.5 g / m ^2, so as to be 0.6 g / m ² And dried at 120 ° C. for 3 minutes, followed by heat treatment at 60 ° C. for 24 hours. Thereafter, the coating liquid for the image forming layer was applied using a wire bar so that the drying amount was 0.6 g / m ² and dried at 50 ° C. for 3 minutes, and then at 50 ° C. for 72 hours. A seasoning treatment was performed to form a hydrophilic layer and an image forming layer on the PET substrate.
<< Preparation of coating solution for hydrophilic layer 1 >>
Colloidal silica (alkaline), Snowtex-XS (Nissan Chemical Co., Ltd., solid content 20% by mass): 48 parts by mass Colloidal silica (alkaline), Snowtex-ZL (Nissan Chemical Co., Ltd., solid content 40% by mass) : 4 parts by mass Nissan Chemical STM-6500S (average particle size 6.5 μm, core-shaped spherical particles with melamine resin and shell made of silica): 15 parts by mass porous metal oxide particles Shilton JC-40 (Mizusawa Made by Kagaku Co., porous aluminosilicate particles, average particle size 4 μm): 11.1 parts by mass Cu—Fe—Mn-based metal oxide black pigment: TM-3550 black powder (manufactured by Dainichi Seika Kogyo Co., Ltd., particle size 0) .About.1 μm) solid content of 40% by mass (of which 0.2% by mass is a dispersant) aqueous dispersion: 20% by mass of 4% by mass of sodium carboxymethylcellulose (manufactured by Kanto Chemical Co.) Solution: 0.56 parts by mass of layered mineral particles montmorillonite and mineral colloid MO (manufactured by Southern Clay Products, average particle size of about 0.1 μm) were vigorously stirred with a homogenizer to form a 5% by mass water-swollen gel. 11 parts by mass of trisodium phosphate.12 water (manufactured by Kanto Chemical Co., Inc.) 10% by mass aqueous solution: 0.28 parts by mass << Preparation of hydrophilic layer 2 coating liquid >>
Colloidal silica (alkaline), Snowtex-S (Nissan Chemical Co., Ltd., solid content 30% by mass): 30 parts by mass Necklace-shaped colloidal silica (alkaline), Snowtex-PSM (Nissan Chemical Co., Ltd., solid content 20 mass) %): 45 parts by mass of porous metal oxide particles SILTON JC-20 (manufactured by Mizusawa Chemical Co., Ltd., porous aluminosilicate particles, average particle size 2 μm): 10 parts by mass of Cu—Fe—Mn-based metal oxide black pigment: TM -3550 black powder (manufactured by Dainichi Seika Kogyo Co., Ltd., particle size of about 0.1 μm) solid content 40% by mass (of which 0.2% by mass is a dispersant) water dispersion: 9 parts by mass sodium carboxymethylcellulose (Kanto Chemical) 4% by weight aqueous solution: 1 part by mass layered mineral particles montmorillonite, mineral colloid MO (manufactured by Southern Clay Products, (Mixed particle size of about 0.1 μm) was vigorously stirred with a homogenizer to obtain a 5% by mass water-swelling gel: 2% by mass trisodium phosphate / 12 water (manufactured by Kanto Chemical Co.) 10% by mass aqueous solution: 0 .5 parts by mass of porous metal oxide particles SILTON AMT08 (manufactured by Mizusawa Chemical Co., Ltd., porous aluminosilicate particles, average particle size 0.6 μm): 12.5 parts by mass << Preparation of Coating Solution for Image Forming Layer >>
Carnauba wax emulsion A118 (Gifu Shellac Co., Ltd.) Average particle size 0.3 μm, solid content 40%: 45 parts by mass Microcrystalline wax A-206 (Gifu Shellac Co., Ltd.): 25 parts by mass Disaccharide trehalose powder (Hayashibara Shoji Co., Ltd.) Manufactured, trehaose) 10% aqueous solution: 15 parts by mass sodium polyacrylate 30% by mass aqueous solution DL-522 (manufactured by Nippon Shokubai Co., Ltd.): 10 parts by mass calcium carbonate powder (manufactured by Maruo Calcium Co., Ltd.): 5 parts by mass isopropyl alcohol: 1 Mass parts Acetylene-based surfactant (Nissin Chemical Industry Co., Ltd. Surfinol 465): 1 part by mass << Preparation of wide belt-form development type lithographic printing plate material >>
As shown in Table 1, the coating liquid for the back surface layer (preparation method is shown below) is formed on the back surface of the PET base material on which the hydrophilic layer and the image forming layer are formed (B surface of the undercoated PET base material). A wide strip-type on-machine development type lithographic printing plate material was prepared with 1500 m each by changing the scratch strength to a dry weight of 2.5 g / m ² using a wire bar, and 1-1 to 1-8. It was.
The scratch strength was changed by changing the addition ratio of DK-05 and Snowtex-XS in the back layer coating solution and the film thickness of the back layer when preparing the back layer coating solution. The scratch strength is a value measured using a HEIDON-18 type scratch tester. The thickness of the wide strip on-press development type lithographic printing plate material was 188 μm. The thickness indicates a value measured by ScanMax manufactured by Tokyo Seimitsu Co., Ltd. In the table, A represents DK-05, and B represents Snowtex-XS.
<< Preparation of coating solution for back layer >>
DK-05: 80 parts by mass Nissan Chemical Co., Ltd. Snowtex-XS: 40 parts by mass polymethyl methacrylate (average particle size 5.5 μm): 1 part by mass Water: 600 parts by mass

(Preparation of roll-form development type printing plate material)
Each of the produced wide belt-like on-machine development type printing plate materials 1-1 to 1-8 is widened by three sets of rotary blades having a set of an upper blade and a lower blade rotating in opposite directions as shown in FIGS. It cut | judged to 560 mm, the winding-up on-machine development type printing plate material was produced for the winding core, and it was set as the samples 101-108. The cutting edge angle of the upper blade used for cutting was 30 °, the cutting edge angle of the lower blade was 90 °, and the clearance between the upper blade and the lower blade was 0% with respect to the thickness of the development type printing plate material on the wide belt-like machine. . The conveyance of the development type printing plate material on the wide belt was 80 m / min.

(Evaluation)
The roll-on-machine development type printing plate materials 101 to 108 were evaluated, and the transportability, burr height, printing stain, peeling of the back layer, and registerability were evaluated by the following methods. The results are shown in Table 2. Show.

Print stain Using a LITHRONE 26 manufactured by Komori Corporation as a printing device, after inserting the notch of the printing plate produced at the time of the transportability test into the pin of the printing device, coated paper (90 kg 720 × 520, manufactured by Hokuetsu Paper), Printed using 2 parts by weight aqueous solution of Astro Mark 3 (Niken Chemical Laboratories) as the fountain solution, and Toyo King High Echo Yellow, Indigo, Red, and Black inks manufactured by Toyo Ink as inks. The number of occurrences of printing stains when printing 10,000 printing plates using a blanket made by Sumitomo Dunlop at 9,000 sheets / hour was visually observed and evaluated.

Peeling of back layer The cut surface was observed using VHX-100 manufactured by Keyence Corporation, and evaluated according to the following evaluation rank.

Evaluation rank ○: No peeling of the back layer △: 1 to 10 peelings of the back layer occurred ×: 11 or more peelings of the back layer occurred Image loss Loss paper from printing until aligning the four color dragonfly images The number of sheets was measured.

  The effectiveness of the present invention was confirmed.

Example 2
When the sample 105 of Example 1 was manufactured, a roll-form on-machine development type printing plate material was prepared under the same conditions except that the blade edge angles and clearances of the upper blade and the lower blade were changed as shown in Table 3. 201-213. In addition, the on-roll development type printing plate material was prepared under the same conditions except that the direction on the image forming layer side at the time of cutting was set to the upper blade side, and used as comparative samples 214 to 221. Note that the blade edge angle indicates a value measured with a loupe with a built-in protractor. The clearance indicates% relative to the thickness of the on-roll development type printing plate material.

(Evaluation)
The roll-on-machine development type printing plate materials 201-221 were evaluated on the transportability, burr height, printing stain, and peeling of the back layer by the following methods. The results are shown in Table 3. In addition, evaluation of printing stain was performed by the same method as in Example 1. Evaluation of peeling of the back surface layer was performed by the same method as in Example 1, and evaluated according to the same evaluation rank.

Evaluation of transportability The development type printing plate material on each roll-like machine is loaded into a dedicated cartridge, and a printing plate material having a plate size of 560 × 670 is used by using a Proplate Setter SS-830 manufactured by Konica Minolta Medical and Graphic Co., Ltd. Was continuously exposed to 10,000 sheets, and the number of conveyance failures when the sheet was unloaded was measured and evaluated.

Burr height The cut surface of 100 samples of each sample is measured with a magnifier with a built-in scale of 250 times and is shown as an average value.

  The effectiveness of the present invention was confirmed.

It is the schematic of a roll-form on-machine development type printing plate material. It is a schematic diagram which shows an example of the cutting method which continuously cut | disconnects a wide strip | belt-form desktop development type printing plate material to a narrow strip | belt-shaped planographic printing plate material with a cutting device. It is a schematic perspective view which shows the relationship between the upper blade shown in FIG. 2, and a lower blade. FIG. 4 is a schematic cross-sectional view along AA ′ in FIG. 3. It is a schematic sectional drawing which shows the state which cut | disconnects a wide strip | belt-shaped desktop developing type printing plate material with the upper blade shown in FIG. 3, and a lower blade. It is an expansion schematic sectional drawing of the part shown by P of FIG.

Explanation of symbols

1, 6 Development type printing plate material on roll-shaped machine 104 Plastic film substrate 105 Hydrophilic layer 106 Image forming layer 107 Back layer 2 Wide belt-like desktop development type printing plate material 4 Upper blade part 401 Disc-shaped upper blade (upper blade)
5 Lower blade part 502 Drum-shaped lower blade (lower blade)
θ1, θ2 Cutting edge angle W Clearance T Burr height

Claims (7)

A wide belt-like planographic printing plate material having a hydrophilic layer and an image forming layer in this order on a long plastic film substrate that travels, and a back surface layer on the back surface, a disk-shaped upper blade that rotates in opposite directions to each other; Using at least one pair of rotary blades having a set with a drum-like lower blade, the wide belt-like lithographic printing plate material is held in the drum-like lower blade along the running direction, and at least two narrow-band lithographic plates In the cutting method to continuously cut into printing plate materials,
The scratch strength of the back layer is 100 to 350 g,
A method for cutting a wide strip lithographic printing plate material, wherein the back layer side is brought into contact with the upper blade side for cutting. The cutting edge angle of the upper blade is 15 to 45 °, the cutting edge angle of the lower blade is 75 to 90 °, and the clearance between the upper blade and the lower blade is 0 to 15 with respect to the thickness of the wide strip lithographic printing plate material. The method for cutting a wide strip lithographic printing plate material according to claim 1, wherein: The wide-band lithographic printing plate material is an on-press development type printing plate material containing a photothermal conversion material that converts near infrared rays into heat in at least one of a hydrophilic layer and a heat-sensitive image forming layer. A method for cutting a wide strip lithographic printing plate material according to claim 1 or 2. The method for cutting a wide strip lithographic printing plate material according to any one of claims 1 to 3, wherein the height of burrs in the cut surface of the narrow strip lithographic printing plate material is 0 to 20 µm. 5. After cutting the wide strip lithographic printing plate material into at least two narrow strip lithographic printing plate materials by the cutting method according to any one of claims 1 to 4, the narrow strip lithographic printing plate material is wound around the core. A rolled lithographic printing plate material characterized in that it is in the form of a take-up roll. The wide-band lithographic printing plate material has a hydrophilic layer and a heat-sensitive image forming layer on a plastic film substrate, and a back layer on the back surface, and at least one of the hydrophilic layer and the heat-sensitive image forming layer. The roll-type planographic printing plate material according to claim 5, which is an on-press development type printing plate material containing a photothermal conversion material that converts near infrared rays into heat. The roll-shaped planographic printing plate material according to claim 5 or 6, wherein a burr height of a cut surface of the narrow strip-shaped planographic printing plate material is 0 to 20 µm.

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