JPWO2013154180A1 - Development apparatus and development method for waterless lithographic printing plate precursor and method for producing waterless lithographic printing plate - Google Patents

Abstract

A developing device for developing a waterless lithographic printing plate precursor after exposure, the developing device supporting a rotatable developing roll that rubs the surface of the waterless lithographic printing plate precursor, and a waterless lithographic printing plate precursor A developing unit comprising a receiving table and a transporting device for transferring a waterless lithographic printing plate precursor, the developing roll having a cloth material fixed on a support, and the developing roll of the receiving table; The upper part is provided with a clearance through which the waterless lithographic printing plate precursor can pass, and the transport device is configured to remove the waterless lithographic printing plate precursor supplied to the developing unit between the receiving table and the developing roll. A developing device for a waterless lithographic printing plate precursor having a function of conveying through and having the function of rubbing the surface of the supplied waterless lithographic printing plate precursor with the developing roll. The present invention provides a method for developing a direct-drawing waterless lithographic printing plate precursor capable of suppressing plate surface scratches and development unevenness even when the development area is large or the number of processed sheets is large.

Description

  The present invention relates to a developing device and a developing method for a waterless lithographic printing plate precursor and a method for producing a waterless lithographic printing plate.

  So far, various printing plates for performing lithographic printing without using dampening water (hereinafter referred to as waterless lithographic printing) using silicone rubber or fluororesin as an ink repellent layer have been proposed. In waterless lithographic printing, the image area and non-image area are on the same plane, the image area is ink-receptive, and the non-image area is ink repellency. This is a lithographic printing method in which ink is applied only to the image area using the difference in ink adhesion, and then printed by transferring the ink to a substrate such as paper. Printing without using dampening water It is a feature that can be done. A printing plate suitable for waterless lithographic printing (hereinafter referred to as waterless lithographic printing plate) is a waterless lithographic printing plate precursor having an ink repellent layer on its surface, which is subjected to an exposure process and a development process, followed by ink repulsion in the image area. Obtained by the method of removing the layer.

  Various exposure methods for waterless planographic printing plate precursors have been proposed. These include a method in which exposure is performed by irradiating the printing plate precursor with ultraviolet rays through the original film, and a computer-to-plate (hereinafter referred to as “computer-to-plate”) that directly writes an image on the printing plate precursor based on document information without using the original film. And CTP). Examples of the CTP method include a method of irradiating a laser beam, a method of writing with a thermal head, a method of partially applying a voltage with a pin electrode, and a method of forming an ink repellent layer or an ink receiving layer by inkjet. Among these, the direct drawing method of irradiating laser light is superior to other methods in terms of resolution and plate making speed.

  There are two methods for irradiating laser light: a photon mode method using a photoreaction and a heat mode method in which photothermal conversion is performed to cause a thermal reaction. In particular, the heat mode method has become more useful due to the advantages of handling in a bright room and the rapid progress of semiconductor lasers as light sources.

  Various proposals have been made so far for the direct-drawing waterless planographic printing plate precursor corresponding to the heat mode method. Among them, the direct-drawing waterless lithographic printing plate precursor that peels off the ink repellent layer from the ink receiving layer by exposure and rises on the plate surface can be developed by applying physical force such as friction after exposure. There are advantages.

  As a method for developing such a direct-drawing waterless planographic printing plate precursor, a wet development method and a dry development method are carried out. The wet development method is a method of rubbing an exposed portion using a brush, a cloth, a development pad or the like in the presence of a liquid. For example, a method of rubbing the surface of the ink repellent layer with a knitted fabric, a woven fabric or a non-woven fabric having an apparent specific gravity of 0.15 or more has been proposed (for example, see Patent Document 1). On the other hand, the dry development method is a method of rubbing an exposed portion in a dry state where no liquid is present. For example, a method of manually rubbing the exposed portion using a cotton pad, gauze, developing pad, or the like has been proposed (see, for example, Patent Documents 2 to 4). In any of the development methods, development can be performed without using a developer containing a harmful organic solvent, and therefore, it is excellent in safety, handleability, and environmental load resistance. Among these, the dry development method is advantageous in that higher-definition development is possible because a higher frictional force is obtained than the wet development method.

JP 2010-224348 A Japanese Patent No. 3422816 Japanese Patent No. 3778969 JP 2002-351088 A

  In the developing methods described in Patent Documents 2 to 4, the contact of the developing member that rubs the ink repellent layer in the exposed area is non-uniform, and the frictional force is partially excessive or excessive. There is a problem that is likely to occur. In particular, when the development area of the printing plate precursor is large or the number of processed sheets is large, the contact of the developing member often becomes non-uniform, and plate surface scratches and development unevenness are remarkable. Accordingly, the present invention solves the problems of the conventional technology, and can suppress plate surface scratches and development unevenness even when the development area is large or the number of processed sheets is large, and water that enables higher-definition development. It is an object of the present invention to provide a developing device and developing method for a lithographic printing plate precursor and a method for producing a waterless lithographic printing plate using the same.

The present invention is a developing device for developing a waterless lithographic printing plate precursor after exposure, the developing device comprising a rotatable developing roll that rubs the surface of the waterless lithographic printing plate precursor, waterless lithographic printing It has a developing unit composed of a cradle that supports the plate precursor and a transport device that transports the waterless lithographic printing plate precursor,
The developing roll has a cloth material fixed on a support, and the developing roll is installed at the top of the cradle with a clearance through which a waterless lithographic printing plate precursor can pass,
The transport device has a function of transporting the waterless lithographic printing plate precursor supplied to the developing unit through a clearance between the cradle and the developing roll,
The developing unit is a developing device for a waterless lithographic printing plate precursor having a function of rubbing the surface of the supplied waterless lithographic printing plate precursor with the developing roll.

  Further, the present invention is a method for producing a waterless lithographic printing plate, wherein a waterless lithographic printing plate is obtained from a waterless lithographic printing plate precursor having an ink repellent layer on the surface, through an exposure step and a development step, and the exposure The step is a step of exposing the waterless lithographic printing plate precursor with a laser beam scanned based on digital data, and the developing step is exposed by the exposing step using the developing device. This is a method for producing a waterless lithographic printing plate, which is a step of removing an ink repellent layer in an exposed area from a waterless lithographic printing plate precursor.

  The present invention also relates to a developing method in which the surface of the rotated development roll is brought into contact with the surface of the waterless lithographic printing plate precursor after exposure in the absence of a liquid and rubbed. This is a method for developing a waterless lithographic printing plate precursor that is brought into contact with the lithographic printing plate precursor without pressing at 400 N / m or less.

  Further, the present invention is a method for producing a waterless lithographic printing plate, wherein a waterless lithographic printing plate is obtained from a waterless lithographic printing plate precursor having an ink repellent layer on the surface, through an exposure step and a development step, and the exposure The step is a step of exposing the waterless lithographic printing plate precursor with a laser beam scanned based on digital data, and the development step is exposed by the exposure step using the development method described above. This is a method for producing a waterless lithographic printing plate, which is a step of removing an ink repellent layer in an exposed area from a waterless lithographic printing plate precursor.

  According to the present invention, even when the development area of the printing plate precursor is large or the number of processed sheets is large, plate surface damage or development unevenness of the waterless lithographic printing plate precursor can be suppressed, and high-definition development can be performed.

It is a schematic diagram showing the cross section of the automatic processor of the present invention.

  The waterless lithographic printing plate uses the difference in ink adhesion, with the image area being ink-receptive and the non-image area being ink repellant, and the image area and non-image area are in the same plane. This is a lithographic printing plate in which ink is applied only to the image area and then transferred to a printing medium such as paper for printing. A waterless lithographic printing plate can be produced by removing the ink repellent layer in the exposed portion from the waterless lithographic printing plate precursor having an ink repellent layer on the surface through an exposure step and a development step. That is, the exposed area from which the ink repellent layer has been removed becomes an ink-receptive image area. On the other hand, the non-exposed area where the ink repellent layer remains is an ink repellent non-image area.

  The developing apparatus and developing method for a waterless lithographic printing plate precursor according to the present invention can be preferably used for a direct-drawing waterless lithographic printing plate precursor in which the ink repellent layer is peeled off from the ink receiving layer by exposure and is raised on the plate surface. it can. As such a direct-drawing waterless lithographic printing plate precursor, for example, as described in JP-A-2009-80422, etc., there is no direct-drawing water having a silicone rubber layer containing a heat-sensitive layer and a colored pigment on a substrate. A lithographic printing plate precursor; a heat-sensitive layer having a liquid bubble containing a liquid having a boiling point in the range of at least 210 to 270 ° C. and a silicone rubber layer, which are described in Japanese Patent No. 4807472, are laminated in this order. Direct-drawing waterless lithographic printing plate precursor: Direct-drawing waterless lithographic plate having a heat-sensitive layer containing at least non-photosensitive particles on a substrate and a silicone rubber layer in this order, as described in JP 2012-093728 A A printing plate precursor; a heat-sensitive layer having at least an inclined region and a silicone rubber layer described in JP 2012-133321 A, etc. Direct drawing type waterless lithographic printing plate precursor having in order: Direct drawing type water having a heat sensitive layer having at least a film thickness reduction region on a substrate, and a silicone rubber layer described in JP 2012-133322 A, etc. None. A lithographic printing plate precursor; a heat-sensitive layer having a phase separation structure having at least a phase containing a novolac resin and a phase containing polyurethane on a substrate, as described in Patent Application No. 2012-504942, etc., and a silicone rubber layer in this order And a direct-drawing waterless lithographic printing plate precursor described in Patent Documents 2 to 4, and the like.

  A method for producing a waterless lithographic printing plate from a waterless lithographic printing plate precursor using the developing method of the present invention will be described below.

  A method for producing a waterless lithographic printing plate from a waterless lithographic printing plate precursor includes at least a step of exposing the waterless lithographic printing plate precursor (exposure step) and a step of developing the waterless lithographic printing plate precursor after exposure (developing step). ). If necessary, you may have the process (water-washing process) of removing a development waste further.

  The exposure process will be described. The exposure step is a step of exposing the waterless lithographic printing plate precursor by ultraviolet rays through the original image film or by laser light scanned based on digital data. When the waterless lithographic printing plate precursor has a protective film, it may be exposed from above the protective film, or may be exposed after peeling off the protective film. Examples of the laser light source used in the exposure step include those having an emission wavelength region in the range of 300 nm to 1500 nm. Among these, a semiconductor laser or a YAG laser having an emission wavelength region near the near infrared region is preferably used. Specifically, laser light having a wavelength of 780 nm, 830 nm, or 1064 nm is preferably used for exposure from the viewpoint of handling of the plate material in a bright room.

  Next, the development process will be described. The development step is a step of removing the ink repellent layer in the exposed portion from the waterless lithographic printing plate precursor exposed in the exposure step.

  A preferred embodiment of the development method of the waterless lithographic printing plate precursor according to the invention is a development method in which the surface of the developing roll rotated after contact with the surface of the waterless lithographic printing plate precursor after exposure is contacted and rubbed in the absence of a liquid. Then, the developing roll is brought into contact with the waterless planographic printing plate precursor with a pushing force of 400 N / m or less. According to this method, since a high frictional force is obtained on the surface of the waterless lithographic printing plate precursor and the surface of the developing roll, high-definition development is possible.

  The developing roll is arranged so that the axis of the developing roll is parallel to the surface of the waterless lithographic printing plate precursor, and the developing roll surface is brought into contact with the surface of the printing plate precursor with a predetermined pushing force. Further, the developing roll rotates about the axis, and rubs the surface of the printing plate precursor on the surface of the developing roll with a rubbing force in a parallel direction to the surface of the printing plate precursor. When the surface of the printing plate precursor and the developing roll are brought into contact with each other and rubbed, the developing roll and the surface of the printing plate precursor are brought into contact with each other over the entire length of the printing plate precursor in a direction parallel to the developing roll. This is preferable because it can be uniformly developed. Furthermore, when the developing roll is brought into contact with the printing plate precursor with an indentation force of 400 N / m or less, a high rubbing force is obtained in a parallel direction on the surface of the waterless lithographic printing plate precursor, thereby enabling high-definition development. It becomes.

  The pressing force of the developing roll against the printing plate precursor is determined by inserting the pressure sensor adjusted to the same thickness as the printing plate precursor into the clearance between the cradle and the developing roll, and then pressing the pressure sensor from above with the pressure sensor. It is a value obtained by dividing by the sensing width.

  In the present invention, development is carried out in the absence of a liquid. When developing in the absence of a liquid, there is an advantage that the frictional resistance of the developing roll surface to the printing plate surface is high, no slip occurs, and a high frictional force is obtained. Conventionally, when developing in the presence of a liquid, since the liquid exists between the cloth material and the plate surface, the frictional resistance of the cloth material is remarkably lowered or “slip” occurs, and the force for rubbing the plate surface is significantly impaired. Therefore, it has been difficult to perform high-definition development.

A preferred embodiment of the developing device for a waterless lithographic printing plate precursor according to the present invention is a developing device for developing a waterless lithographic printing plate precursor after exposure, wherein the developing device is a surface of a waterless lithographic printing plate precursor. A developing unit comprising a rotatable developing roll for rubbing, a cradle for supporting the waterless lithographic printing plate precursor, and a transport device for transporting the waterless lithographic printing plate precursor,
The developing roll has a cloth material fixed on a support, and the developing roll is installed at the top of the cradle with a clearance through which a waterless lithographic printing plate precursor can pass,
The transport device has a function of transporting the waterless lithographic printing plate precursor supplied to the developing unit through a clearance between the cradle and the developing roll,
The developing unit has a function of rubbing the surface of the supplied waterless planographic printing plate precursor with the developing roll.

  The developing roll preferably has a rotation axis parallel to the waterless planographic printing plate precursor surface, and the outer diameter is preferably constant with respect to the rotation axis. This is because the speed of the roll surface generated by the rotation of the developing roll can be easily made uniform, and the fluctuation of the frictional force and the contact frequency can be reduced. On the other hand, in the case of having a rotation axis perpendicular to the waterless lithographic printing plate precursor surface such as a rotating disk, the portion closer to the central axis has a lower speed, and the portion farther away has a higher speed, resulting in frictional force and contact. Since the fluctuation of the frequency becomes large, generation of plate surface scratches and development unevenness increases, which is not preferable.

  The developing roll preferably has a cloth material fixed on a roll-shaped support. The term “cloth material” as used herein refers to a material obtained by interlacing a large number of organic polymer fibers so as to have a thin and wide surface. As the developing roll in which the cloth material is fixed on the support, a sheet-like cloth material is wound around the surface of the support, the developing roll is wound so that the cloth material is parallel to the surface of the support, and the support roll is cylindrical. A developing roll fitted with a cloth material, a developing roll (flap type) in which the edges of a sheet-like cloth material are fixed radially on the outer periphery of the support, and the center of the cloth material punched into a disk shape on the support are overlapped. Examples include a developing roll (disk type). From the viewpoint of simplicity of fixing the cloth material, a developing roll wound around the surface of the support so that the surface of the sheet-like cloth material is parallel, or a developing roll in which a cylindrical cloth material is fitted to the support is preferable. .

  As the cloth material, for example, a knitted fabric, a woven fabric, a non-woven fabric, a felt or the like can be used. Two or more of these may be used.

  The knitted fabric may be either a weft knitting or a warp knitting, and cylindrical knitting, flat knitting, rib knitting, double-sided knitting, pearl knitting, tricot, Russell and the like can be used. The method of knitting is not limited. Cylindrical knitting is desirable because it can be easily fixed to a roll.

  The woven fabric may be any of plain weave, twill weave, and satin weave. As for twill weave and satin weave, it is possible to use three slashes, four slashes, five sashes and the like. The weaving method is not limited.

  The fabric material is preferably a knitted fabric or a woven fabric having a pile on the surface, with the knitted fabric or the woven fabric as a base. By having a pile on the surface, the cloth material can be made thick, and the frictional force can be easily made constant due to its flexibility, so that the occurrence of uneven development and scratches on the plate surface can be further suppressed. The pile may be a loop pile or a cut pile, but the loop pile is preferred from the viewpoint of productivity. A pile may be provided only on one side of the cloth material, or may be provided on both sides.

  Such a knitted fabric or woven fabric having a pile on the surface can be produced by, for example, a cylindrical knitting machine or a circular knitting machine having a sinker pile device. Examples of knitted or woven fabrics having a pile on the surface include Karamanbo (manufactured by Technoroll Co., Ltd.), NEWMOL (registered trademark) (manufactured by Kanuki Roller Mfg. Co., Ltd.), and blue ice (manufactured by Nihon Komugi Kogyo Co., Ltd.) Etc.

  When a nonwoven fabric or felt is used as the cloth material, a general-purpose material can be used, but a nonwoven fabric having a fiber bond is preferable in terms of less fiber dropping. As the fiber bond, for example, a thermal bond, a chemical bond, a needle punch, a spunlace, a stitch bond, a steam jet, or the like can be used, but not limited thereto. From the viewpoint of durability, a thermal bond or a chemical bond is preferable.

  Examples of such non-woven fabrics are ELTAS (registered trademark) (manufactured by Asahi Kasei Fibers), ELTAS SOFT (manufactured by Asahi Kasei Fibers), cordon felt (manufactured by Asahi Kasei Fibers), dc-fix ( Konrad Hornschuch AG), Sprytop (registered trademark) (manufactured by Maeda Kosen Co., Ltd.), Stratec (registered trademark) (manufactured by Idemitsu Petrochemical Co., Ltd.), Mantle (registered trademark) (manufactured by Toray Industries, Inc.) , Sanibon (registered trademark) (manufactured by Gokukura Co., Ltd.), Cranbon (registered trademark) (Kurashiki Fiber Processing Co., Ltd.), Bonric (registered trademark) (Venus Paper Co., Ltd.), and the like.

  In general, the knitted fabric or the woven fabric having a pile on the surface can give the cloth material a thickness corresponding to the protrusion of the pile on the surface. Therefore, it is advantageous in that it is easy to further improve flexibility. If the cloth material is flexible, it is easy to make the frictional force constant, so that development unevenness and plate surface scratches can be further suppressed.

  The material of the cloth material is, for example, cotton, silk, hemp, mohair, wool, cashmere for natural fibers; rayon, acetate, cupra (registered trademark) for recycled fibers; nylon, polyvinylidene chloride, polypropylene, polyurethane, polyester for synthetic fibers Etc. can be used, but this is not the case. It is preferable to use a fiber having a Young's modulus of 3 GPa or less as a fiber constituting at least the surface of the cloth material, because development unevenness and generation of plate surface scratches can be further suppressed. Examples of preferred fibers include fibers selected from wool, nylon and polyvinylidene chloride.

  The single yarn diameter of the fiber can be selected without limitation as long as a fabric material such as a knitted fabric, a woven fabric, a nonwoven fabric, or a felt can be formed. When the single yarn diameter of the fibers constituting at least the surface of the cloth material is 30 μm or less, it is preferable because development unevenness and plate surface scratches can be further suppressed.

The volume density of the cloth material is preferably 0.12 g / cm ³ or more, and more preferably 0.15 g / cm ³ or more. If it is 0.12 g / cm ³ or more, since the fiber density is high, the frictional force becomes high and high-definition development is possible. On the other hand, the volume density of the cloth material is preferably 0.40 g / cm ³ or less, and more preferably 0.30 g / cm ³ or less. If it is 0.40 g / cm ³ or less, since the flexibility is high and the frictional force is easily made constant, the uneven contact of the cloth material can be further suppressed, and the development unevenness and the plate surface damage can be further suppressed.

The volume density Vd of the cloth material can be calculated from the following equation. Here, the mass per 1 cm ^{2 in} the standard state of the cloth material is the length of the cloth material after the cloth material was allowed to stand for 1 hour in the standard state of relative humidity (50 ± 10)% and temperature (23 ± 2) ° C. It can be determined by measuring the width, weight and weight. Further, the thickness of the cloth material is an average value of the thicknesses of arbitrary 10 points measured while applying a load of 26 g / cm ² .
Vd = (Ad / t) × 10
Vd = volume density (g / cm ³ )
Ad = mass per cm ² in standard state (g / cm ² )
t = thickness (mm) of the cloth material.

  The method of fixing the cloth material to the roll-shaped support is not particularly limited. However, if the cloth material is a sheet, it can be fixed with a general-purpose double-sided adhesive tape, an adhesive, a binding band, or the like. Among them, the double-sided adhesive tape is excellent in that it has few oozing components to the cloth material and can fix the entire surface uniformly. By fixing the cloth material on the support, the surface of the support and the cloth can be rotated as a developing roll without shifting. When the cloth material is a tubular knitting, it is advantageous in that it can be attached as it is without depending on a double-sided tape or the like. Furthermore, the tubular knitted fabric material that shrinks by applying heat, wetting with water, or both can be preferably used because it can be firmly and uniformly fixed to the support. In addition, it is advantageous in terms of handling that the cloth material itself has elasticity.

  As a roll-shaped support for fixing the cloth material, for example, a rubber roll, a sponge roll, a resin roll, a metal roll, or the like can be used. The durometer hardness measured based on the JIS K 6253 (2012) standard is preferably A10 to 50 degrees. Moreover, it is preferable that the said support body is what has arrange | positioned rubber | gum to at least one part of the surface. Rubber is easy to adjust the flexibility, and by appropriately increasing the flexibility of the roll, it is possible to further suppress plate surface scratches and development unevenness due to uneven contact of the cloth material. Further, by appropriately controlling the flexibility of the roll, sufficient frictional force can be easily obtained, and higher-definition development can be performed. More preferably, the support is a rubber roll having rubber disposed on the entire surface.

  Examples of the rubber material include, but are not limited to, nitrile butyl rubber, chloroprene rubber, ethylene / propylene rubber, butyl rubber, styrene rubber, urethane rubber, hibaron rubber, silicone rubber, and fluorine rubber.

  The rubber hardness is preferably A50 degrees or less, and more preferably A30 degrees or less. If the rubber hardness is A50 degrees or less, it is easy to make the frictional force constant, so that plate surface scratches and development unevenness can be further suppressed. However, the above-mentioned conditions are for a general-purpose cloth material having a thickness of 1 mm or less, and this is not the case when the cloth material to be fixed has a sufficient thickness and is highly flexible.

  Examples of a method for adjusting the rubber hardness to an arbitrary range include a method for selecting a rubber material, a method for adjusting the degree of crosslinking of rubber, and a method for adding an additive. Rubber rolls having various rubber hardness are commercially available. In the present invention, as long as the durometer hardness is within the above range, the hardness may be adjusted by any means.

  Here, the rubber hardness refers to the durometer hardness obtained according to JIS K 6253 (2012) standard. The rubber hardness of the rubber roll can be measured using a test piece having a size of 30 mm × 30 mm and a thickness of 10 mm. The test piece is allowed to stand for 1 hour in the standard state, and then measured under the standard state. The standard conditions are a relative humidity (50 ± 10)% and a temperature (23 ± 2) ° C. The measurable range of type A durometer hardness is A10 to 90 degrees, but in order to improve the measurement accuracy, when it is less than A20 degrees, it is measured with a type E durometer. Hold the durometer so that the pusher needle is at right angles to the measurement surface at a position 12 mm or more away from the end of the test piece, and bring the pressure surface into close contact with the test piece measurement surface as quickly as possible without applying an impact. Read the scale after holding for 15 seconds. This operation is repeated three times, and the value obtained by rounding off the first decimal place of the average value is defined as rubber hardness. When A is less than 20 degrees, E hardness measured with a type E durometer is obtained. When measured by such a method, the preferable range of the rubber hardness described above is E10 degrees or more and less than E20 degrees or A20 degrees or more and A50 degrees or less.

  The rubber thickness of the rubber roll is not particularly limited, but 10 to 30 mm is preferable in terms of cost.

  Examples of the material for the sponge roll include, but are not limited to, ethylene vinyl acetate copolymer (EVA), polyurethane, polyvinyl alcohol, and the above rubber.

  As the material of the resin roll, for example, polyurethane resin, nylon resin, polyacetal resin, polyethylene resin, polypropylene resin, ABS resin, fluororesin and the like can be used, but not limited thereto.

  As the material of the metal roll, for example, stainless steel, steel, aluminum, chromium, titanium, and the like can be used, but not limited thereto.

  The contact frequency between the developing roll surface and the waterless lithographic printing plate precursor and the frictional force greatly contribute to the definition of development of the waterless lithographic printing plate precursor.

  The contact frequency between the developing roll surface and the waterless lithographic printing plate precursor is the relative speed between the developing roll surface and the waterless lithographic printing plate precursor. Since the speed of the surface of the developing roll is proportional to the rotational speed of the developing roll and the diameter of the roll, any speed can be applied depending on the combination of the rotational speed of the roll and the roll diameter. If the roll rotation speed or the roll diameter is increased, the speed of the developing roll surface is increased, and as a result, the contact frequency is also increased.

  Here, the relative speed between the surface of the developing roll and the waterless lithographic printing plate precursor is expressed by (peripheral speed of developing roll) / (conveying speed of printing plate precursor). From the viewpoint of further suppressing development unevenness and improving developability, the relative speed is preferably high. On the other hand, it is preferable that the relative speed is low from the viewpoint of further suppressing plate surface scratches. The relative speed is preferably 50 or more, and more preferably 150 or more. If it is 50 or more, higher-definition development is possible. On the other hand, the relative speed is preferably 1000 or less, and more preferably 700 or less. If it is 1000 or less, plate surface scratches can be further suppressed.

  The frictional force between the developing roll surface and the waterless lithographic printing plate precursor is determined by selecting the material of the developing roll surface, the pushing force of the developing roll surface onto the waterless lithographic printing plate precursor, and the developing roll surface being waterless lithographic printing during development. It can be adjusted by the area continuously in contact with the plate precursor and the relative speed of the waterless lithographic printing plate precursor.

  The pushing force of the developing roll surface onto the waterless lithographic printing plate precursor can be adjusted by increasing or decreasing the distance from the roll central axis to the surface of the waterless lithographic printing plate precursor during development. In other words, the amount of displacement of the central axis of the developing roll (hereinafter referred to as the indentation length) when the developing roll is pushed down from the position where the surface of the printing plate precursor and the developing roll surface come into contact with no load to the developing position is adjusted as an index. it can.

  The pushing force of the developing roll onto the surface of the waterless lithographic printing plate precursor is preferably large from the viewpoint of increasing the frictional force to further suppress development unevenness and improve developability. On the other hand, from the viewpoint of further suppressing plate surface scratches, it is preferable that the pushing force is small. The pushing force of the developing roll onto the surface is preferably 15 N / m or more, and more preferably 25 N / m or more. If it is 15 N / m or more, higher-definition development is possible. On the other hand, the pushing force is preferably 400 N / m or less, and more preferably 250 N / m or less. If the pushing force is 400 N / m or less, the plate surface scratch can be further suppressed.

  The area where the surface of the developing roll continuously contacts the waterless lithographic printing plate precursor during development is the length in the direction perpendicular to the developing roll, out of the length in the direction parallel to the developing roll and the length perpendicular to the developing roll. It can be increased or decreased by changing the height. The length in the direction perpendicular to the developing roll is defined as the rubbing width. The rubbing width can be confirmed as the width of the rubbing trace on the plate surface by rubbing the same portion of the plate surface for a predetermined time with a predetermined pushing length without conveying the printing plate. There is a correlation between the rubbing width and the indentation length, and the rubbing width increases as the indentation length increases. The wider the rubbing width, the higher the frictional force, so that development unevenness can be further suppressed and the developability can be improved. On the other hand, if the indentation length is excessively increased in order to widen the rubbing width, the plate surface scratch tends to deteriorate. As a countermeasure, in order to obtain a wide rubbing width while keeping the indentation length small, the pass line of the printing plate precursor is lowered so that the surface of the printing plate precursor is aligned with the curved surface of the developing roll surface. There are a method of wobbling and a method of increasing the developing roll diameter. The rub width is not particularly limited because the optimum value is determined by a plurality of factors such as the indentation length, the pass line, and the developing roll diameter. The rubbing width is preferably 3 mm or more and more preferably 5 mm or more from the viewpoint of obtaining sufficient frictional force and uniformity of the rubbing width in the width direction of the developing roll. If the rubbing width is 3 mm or more, a high frictional force can be obtained, and variations in the rubbing width in the width direction can be suppressed. On the other hand, the rubbing width is preferably 20 mm or less, and more preferably 18 mm or less. If the rubbing width is 20 mm or less, it is possible to suppress conveyance failure and wear of the cloth material due to excessive frictional force.

  The rubbing force in the parallel direction acting on the surface of the waterless lithographic printing plate precursor is preferably high from the viewpoint of further suppressing development unevenness and improving developability. On the other hand, it is preferable that the rubbing force is low from the viewpoint of transportability for moving the printing plate precursor at a constant speed without bending or buckling of the plate edge. The rubbing force is preferably 80 N / m or more, and more preferably 100 N / m or more. If the rubbing force is 80 N / m or more, higher-definition development is possible. On the other hand, the rubbing force is preferably 220 N / m or less, and more preferably 200 N / m or less. If the rubbing force is 220 N / m or less, the printing plate precursor can be normally conveyed. The rubbing force is adjusted by the indentation length, rubbing width, and relative speed of the developing roll surface into the waterless lithographic printing plate precursor.

  The rubbing force in the direction parallel to the surface of the printing plate precursor of the developing roll can be measured using a force gauge as a force for pulling the printing plate precursor by friction on the rotating developing roll surface. The value of rubbing force is obtained by dividing the actually measured force by the width of the printing plate precursor used for the measurement.

  The diameter of the developing roll is preferably 60 mm or more, and more preferably 70 mm or more. If the diameter of the roll is 60 mm or more, the contact frequency increases and high-definition development is possible. On the other hand, the diameter of the roll is preferably 130 mm or less, and more preferably 100 mm or less. If the roll diameter is 130 mm or less, the frictional force required for development can be obtained even when the length of the roll pushed into the plate surface is small.

  The rotation speed of the developing roll may be constant or gradually increased or decreased. Although the rotation speed of a roll is not specifically limited, 200 rpm or more is preferable at the point of contact frequency. On the other hand, the rotational speed of the roll is preferably 600 rpm or less in terms of structural strength. By rotating the developing roll with a motor and controlling the roll rotation speed with an inverter, the roll can be rotated at an arbitrary speed. Also, when using a developing roll with a cloth material fixed on a support, by adjusting the flexibility of the cloth material and the support for fixing the cloth material, high-definition can be achieved while preventing the uneven contact of the cloth material more effectively. The frictional force necessary for proper development can be ensured.

  The number of times the surface of the waterless lithographic printing plate precursor after exposure and the surface of the rotated developing roll are brought into contact with each other and rubbed is not particularly limited, but is twice or more in view of enabling high-definition development. Is preferred. In this case, one developing roll may be brought into contact with the surface of the printing plate precursor twice or more and rubbed, or two or more developing rolls may be brought into contact with the surface of the printing plate precursor and rubbed. It is preferable to use the same number of developing rolls as the number of times of rubbing and bring the developing rolls into contact with the surface of the printing plate precursor once to rub them, so that development can be performed in a shorter time. In this case, two or more developing rolls and the surface of the printing plate precursor may be brought into contact with each other at the same time or rubbed in succession. Further, from the viewpoint of suppressing the occurrence of scratches on the plate surface, the number of times of contact and friction between the surface of the printing plate precursor and the surface of the developing roll is preferably 4 or less. If it is 4 times or less, generation | occurrence | production of a printing plate surface damage can be suppressed. The number of developing rolls is not particularly limited, but is preferably 2 or more from the viewpoint of enabling high-definition development. Two or more developing rolls and a waterless lithographic printing plate precursor are brought into contact and rubbed to enable high-definition development. On the other hand, the number of developing rolls is preferably 4 or less from the viewpoint of suppressing the occurrence of plate surface scratches. If the number of the developing rolls is 4 or less, even if the developing roll is brought into contact with the waterless lithographic printing plate precursor and rubbed, the generation of the plate surface scratches can be suppressed.

  By moving the waterless lithographic printing plate precursor with respect to the developing roll by the conveying device, the entire surface of the printing plate precursor can be developed. The relationship between the moving direction of the waterless planographic printing plate precursor and the rubbing direction of the developing roll may be the same direction (forward rotation) or the opposite direction (reverse rotation). When two or more developing rolls are used, any of forward rotation only, reverse rotation only, or a combination of forward rotation and reverse rotation may be used. Further, when one developing roll is brought into contact with the printing plate precursor twice or more, it may be brought into contact with the same rubbing direction or in such a manner that the rubbing directions are opposite. In terms of preventing development residue from being generated, the printing plate precursor is preferably brought into contact with the forward-rotating developing roll once or more, and with the reverse-rotating developing roll once or more. More preferably, one or more forward-rotating developing rolls and one or more reverse-rotating developing rolls are provided, and the printing plate precursor is brought into contact with the developing roll.

  Next, the water washing process will be described. The water washing step is a step of removing development residue adhering to the printing plate after development. While showering water or surfactant-containing water, rotate the cleaning brush and gently rub only the surface of the printing plate after development or the front and back surfaces without damaging the plate surface. Is preferably removed.

  Part or all of the development process and the water washing process may be incorporated into the development apparatus and automatically processed. The automatic developing device preferably has a transport mechanism for transporting the waterless planographic printing plate precursor, and preferably has a developing unit corresponding to the developing step and, if necessary, a water washing unit corresponding to the water washing step.

  The developing section of the automatic developing device is responsible for the process of removing the ink repellent layer in the exposed section, and at least the developing roll that rubs the surface of the waterless lithographic printing plate precursor after exposure, the surface of the waterless lithographic printing plate precursor Is configured by a cradle that supports the waterless lithographic printing plate precursor and a transport device that transports the waterless lithographic printing plate precursor. Here, the cradle and the transfer device may be integrated. The roll and the cradle are arranged on the same line in the vertical direction, and at least a clearance through which the waterless lithographic printing plate precursor after the exposure can pass is passed between the roll arranged at the upper part and the cradle arranged at the lower part. Is provided. The exposed waterless lithographic printing plate precursor is developed by removing the ink repellent layer in the exposed area by being rubbed on the surface by a cloth material fixed to a rotating roll while being transported to the clearance at an arbitrary speed. The The frictional force at this time can be arbitrarily adjusted according to the number of rotations of the roll, the length of pressing, and the like. The roll may be forward-rotated or reverse-rotated, and may be any of forward-rotation only, reverse-rotation only, or a combination of forward-rotation and reverse-rotation.

  The water washing section of the automatic developing device is responsible for removing the development residue adhering to the developed waterless lithographic printing plate conveyed from the developing section. At least, the washing brush, the developed waterless lithographic plate It is composed of a shower for wetting the printing plate and cleaning brush, and a device for transporting the waterless planographic printing plate after development. The surface of the waterless planographic printing plate after development is rotated by rotating the washing brush while showering water or water containing a surfactant on the developed waterless planographic printing plate conveyed from the development unit. It is preferable to remove the development residue without scratching the plate surface of the waterless lithographic printing plate only or by rubbing the front and back surfaces lightly. The number of the cleaning brushes is not particularly limited. However, if two or more brushes are used, it is advantageous because reliability is increased in removing the development residue. However, if there is a reverse rotation roll among the rolls to which the above-mentioned cloth material is fixed, the amount of development waste brought into the washing section is reduced, and the burden on the washing section is reduced.

  In the automatic developing machine, the waterless lithographic printing plate is rubbed by the developing roll in the absence of liquid by partitioning so that the liquid in the washing section does not flow into the developing section. It is preferable.

  Hereinafter, the present invention will be described in more detail with reference to examples. Evaluation in each Example and Comparative Example was performed by the following method.

(1) Production of direct-drawing waterless lithographic printing plate precursor The following heat insulating layer composition solution was applied onto a 0.24 mm thick degreased aluminum substrate (manufactured by Mitsubishi Aluminum Co., Ltd.), and at 200 ° C. for 90 seconds. It dried and provided the heat insulation layer with a film thickness of 10 g / m < ² >.

<Insulation layer composition solution>
(A) Polymer having active hydrogen: Epoxy resin: “Epicoat (registered trademark)” 1010 (manufactured by Japan Epoxy Resin Co., Ltd.): 35 parts by weight (b) Polymer having active hydrogen: Polyurethane: “Samprene (registered trademark)” "LQ-T1331D (manufactured by Sanyo Chemical Industries, solid content concentration: 20% by weight): 375 parts by weight (c) Aluminum chelate:" aluminum chelate "ALCH-TR (manufactured by Kawaken Fine Chemical Co., Ltd.): 10 weights Part (d) Leveling agent: “Disparon (registered trademark)” LC951 (manufactured by Enomoto Kasei Co., Ltd., solid content: 10% by weight): 1 part by weight (e) Titanium oxide: “Typaque (registered trademark)” CR-50 N, N-dimethylformamide dispersion (Ishihara Sangyo Co., Ltd.) (titanium oxide 50% by weight): 60 parts by weight (f) N, N-dimethylformamide: 30 parts by weight (g) Methyl ethyl ketone: 250 parts by weight.

Next, the following heat-sensitive layer composition solution was applied onto the heat insulating layer and heated at 120 ° C. for 30 seconds to provide a heat-sensitive layer (ink receiving layer) having a thickness of 1.5 g / m ² .

<Thermosensitive layer composition solution>
(A) Infrared absorbing dye: “PROJET (registered trademark)” 825LDI (manufactured by Avecia): 10 parts by weight (b) Organic complex compound: titanium di-n-butoxide bis (2,4-pentandionate): “Narsem (registered) Trademark) “Titanium (Nippon Chemical Industry Co., Ltd., concentration: 73 wt%, n-butanol as a solvent (boiling point: 117 ° C., solubility parameter: 23.3 (MPa) ^1/2 ): 17 wt% included) : 11 parts by weight (c) Phenol formaldehyde novolac resin: “Sumilite Resin (registered trademark)” PR50731 (manufactured by Sumitomo Bakelite Co., Ltd., heat softening point: 95 ° C.): 75 parts by weight (d) Polyurethane: “Nipporan (registered) Trademark) "5196 (manufactured by Nippon Polyurethane Co., Ltd.), concentration: 30% by weight, methyl ethyl ketone as a solvent (boiling point: 80 ° C) Solubility parameter: 19.0 ^(MPa) 1/2): 35 wt%, cyclohexanone (boiling point: 155 ° C., solubility parameter: 20.3 ^(MPa) 1/2): containing 35% by weight): 20 parts by weight ( e) Methyl ethyl ketone (boiling point: 80 ° C., solubility parameter: 19.0 (MPa) ^1/2 ): 434 parts by weight (f) ethanol (boiling point: 78 ° C., solubility parameter: 26.0 (MPa) ^1/2 ): 85 parts by weight (g) aliphatic saturated hydrocarbon: “Isopar (registered trademark)” M (manufactured by Esso Chemical Co., Ltd., boiling point: 223-254 ° C., solubility parameter: 14.7 (MPa) ^1/2 ): 5 Parts by weight.

The solid content concentration of the heat-sensitive layer composition solution is 15.5% by weight, the solubility parameter is 17.0 (MPa) ^1/2 or less, and the content of the liquid having a boiling point in the range of 210 to 270 ° C. is 0.78% by weight. Moreover, when the cross section of the obtained thermosensitive layer was observed under conditions of an acceleration voltage of 100 kV and a magnification of 2000 using a transmission electron microscope H-1700FA type (manufactured by Hitachi), it had a boiling point in the range of 210 to 270 degrees. Liquid bubbles derived from “Isopar (registered trademark)” M, which is a liquid, were confirmed.

Next, the following silicone rubber layer composition solution prepared immediately before coating was applied onto the heat sensitive layer and heated at 130 ° C. for 90 seconds to form a 2.0 g / m ² silicone rubber layer (ink repellent layer). Provided. The silicone rubber layer immediately after heating was completely cured.

<Silicone rubber layer composition solution>
A bitumen dispersion was obtained by dispersing the following (a) to (c) with a bead mill “Star Mill (registered trademark)” Minizea (manufactured by Ashizawa Finetech Co., Ltd.) filled with zirconia beads (φ0.3 mm). . On the other hand, a silicone diluent was obtained by mixing (d) to (h). While stirring the bitumen dispersion, the silicone diluent was added and stirred well until uniform. The resulting liquid was naturally degassed.
(A) N650 bitumen (manufactured by Dainichi Seika Co., Ltd.): 4 parts by weight (b) “Plenact (registered trademark)” KR-TTS (manufactured by Ajinomoto Fine Techno Co., Ltd.): 1.5 parts by weight (c) “ Isopar (registered trademark) “M (Esso Chemical Co., Ltd.): 83 parts by weight (d) α, ω-divinylpolydimethylsiloxane:“ DMS ”V52 (weight average molecular weight 155000, manufactured by GELEST Inc.): 83 parts by weight (E) Methyl hydrogen siloxane “SH” 1107 (manufactured by Toray Dow Corning Co., Ltd.): 4 parts by weight (f) Vinyl tris (methylethylketooxyimino) silane: 3 parts by weight (g) Platinum catalyst “SRX” 212 (Toray Dow) Corning Co., Ltd.): 6 parts by weight (h) “Isopar (registered trademark)” E (Esso Chemical Co., Ltd.): 817 parts by weight.

  The direct-drawing waterless planographic printing plate precursor produced as described above was used for evaluation in the following examples and comparative examples.

(2) Calculation of volume density of cloth material (2-1) Thickness of cloth material Using a micrometer (DIGITAL MICROMATOR M-30 manufactured by Sony), any 10 points of cloth material while applying a load of 26 g / cm ² The thickness (mm) was measured, and the average value was taken as the thickness of the cloth material.

(2-2) Mass per cm ² in the standard state of the cloth material After the cloth material was left in the standard state for 1 hour, the length, width and weight were measured, and the mass per cm ² in the standard state of the cloth material. (G / cm ² ) was calculated. The standard conditions were a relative humidity (50 ± 10)% and a temperature (23 ± 2) ° C.

(2-3) Calculation of volume density of cloth material The volume density Vd of the cloth material was calculated from the following equation.
Vd = (Ad / t) × 10
Vd = volume density (g / cm ³ )
Ad = mass per cm ² in standard state (g / cm ² )
t = cloth thickness (mm)
(3) Rubber hardness measurement When the roll to be used is a rubber roll, durometer hardness was determined according to JIS K 6253 (2012) standard as an index indicating its flexibility. The rubber hardness of the rubber roll was measured by preparing a test piece from the same rubber used for the rubber roll. Here, the size of the test piece was 30 mm × 30 mm, and the thickness was 10 mm. The test piece was allowed to stand for 1 hour in the standard state, and then measured under the standard state. The standard conditions were a relative humidity (50 ± 10)% and a temperature (23 ± 2) ° C. The measurement range of the type A durometer was A20 to 90 degrees, and when the hardness was less than A20 degrees, the measurement was performed with a type E durometer. Hold the durometer so that the pusher needle is at right angles to the measurement surface at a position 12 mm or more away from the end of the test piece, and bring the pressure surface into close contact with the test piece measurement surface as quickly as possible without applying an impact. The scale was read after holding for 15 seconds. This operation was repeated three times, and the value obtained by rounding off the first decimal place of the average value was defined as rubber hardness.

  For the sponge roll, the hardness was measured in the same manner as the rubber roll, and the hardness corresponding to the rubber hardness was obtained.

(4) Calculation of indentation force acting on the surface of waterless lithographic printing plate precursor (4-1) Calculation of indentation force on plate surface when developing automatically using cloth material Acting on the surface of waterless lithographic printing plate precursor The pushing force was measured using a strain gauge composed of an FSR sensor (manufactured by Interlink) and 3803 DIGITAL HiTESTER (manufactured by HIOKI). An FSR sensor having the same thickness as the waterless planographic printing plate precursor used in each example and comparative example is sandwiched between a roll and a cradle used in each example and comparative example, and 3803 DIGITAL HiTESTER is connected to the FSR sensor. The resistance value was read with. Using the attached resistance-load conversion table, the pushing force to the printing plate of the cloth material was calculated from the read resistance value.

(4-2) Calculation of indentation force onto the plate surface when manually developing with a cloth material When manually developing with a cloth material, the pressure measurement sheet “Prescale (registered trademark)” (FUJIFILM Manufactured, for fine pressure, measurable pressure range: 510-2040 g / cm ² ) with the same force as during development in each comparative example, and using the attached pressure conversion table from the discoloration density, push the cloth material into the plate surface Force was calculated.

(5) Calculation of the rubbing force in the parallel direction acting on the surface of the waterless lithographic printing plate precursor The parallel rubbing force acting on the surface of the waterless lithographic printing plate precursor during development is determined by a push-pull gauge FGP-20 (manufactured by SHIMPO). And measured. A push-pull gauge was attached to the waterless lithographic printing plate precursor, sandwiched between the developing roll and the cradle, and the force drawn by the rotation of the developing roll was measured. The rubbing force was determined by repetitively standardizing the width of the waterless planographic printing plate precursor used for the measurement.

(6) Evaluation of fine dot reproducibility (6-1) Exposure Using an exposure machine “PlateRite” 8800E (manufactured by Dainippon Screen Mfg. Co., Ltd.), exposure was performed at an irradiation energy of 130 mJ / cm ² . The above waterless planographic printing plate precursor having a size of 100 mm × 560 mm was exposed to at least 2400 dpi, 175 lines of AM 0.5%, 1%, and 2% micro dots with an image area of 2.5 mm × 2.5 mm, respectively.

(6-2) Development The sample for evaluation of fine dot reproducibility exposed in (6-1) above was developed, and the fine dot reproduction rate was confirmed. If a 2.5mm x 2.5mm image is observed with a magnifying glass at 25x, 1% can be reproduced 100%, and if 0.5% is reproduced 90% or more, A, 1% is 100% If 1% can be reproduced 100%, but 0.5% can be reproduced less than 50%, C 1 % Is not 100% reproducible, but D is 2% if 100% is reproducible, and E is 2% if 100% is not reproducible.

(7) Evaluation of development uniformity (7-1) Exposure Using an exposure machine “PlateRite” 8800E (Dainippon Screen Mfg. Co., Ltd.), exposure was performed at an irradiation energy of 130 mJ / cm ² . The above-mentioned waterless lithographic printing plate precursor having a size of 1130 mm × 900 mm was exposed to an image area of 1000 mm × 100 mm with at least 2400 dpi and 175 lines of AM1%.

(7-2) Development The sample for evaluation of development uniformity exposed in (7-1) was developed, and the presence or absence of development unevenness was observed. The developed plate was divided into 10 equal parts in the width direction, and a range of 2.5 mm × 2.5 mm was observed with a magnifier of 25 times in each region. The poorest developability of the 10 spots was evaluated. A 1% flat mesh was reproduced 100%, A was reproduced 90% to less than 100%, B was reproduced 50% to less than 90%. It was C if it was made, D if less than 50% was reproduced, and E if it was not reproduced at all.

(8) Evaluation of plate surface scratches After developing a waterless lithographic printing plate precursor of 1130 mm × 900 mm size under the same conditions as in the above (6) and (7), 5 regions of 100 mm × 100 mm were randomly selected. Selected. The silicone rubber layer of the selected area is carefully visually observed while being swollen with “Isopar (registered trademark)” E (Esso Chemical Co., Ltd.) that swells the silicone rubber layer, and the number of scratches with a length of 5 mm or more is measured. I counted. The average value of the number of scratches in the five regions is obtained. If it is less than 4, A is 4 or more and less than 9, B is 9 or more and less than 15, C is 15 or more and less than 25, D is 25 or more. If so, it was evaluated as E.

(Example 1)
In an automatic developing machine TWL-1160GII (manufactured by Toray Industries, Inc.), the specified developing rotating brush was replaced with a developing roll (1200 mm width) on which a cloth material was fixed, as described in the following developing roll condition 1. Further, the automatic developing machine is remodeled so that the liquid in the washing section of the automatic developing machine does not flow into the developing part, and the waterless planographic printing plate after development can be rubbed by the developing roll in the absence of liquid. Was prepared (FIG. 1). Using this automatic developing machine, while transporting the waterless lithographic printing plate precursor at a speed of 80 cm / min, two rolls, a forward rotation developing roll at a rotation speed of 400 rpm and a reverse rotation developing roll at the same rotation speed, are used. The surface of the original plate was rubbed for development. The roll axis of rotation was parallel to the plate surface.

<Development roll condition 1>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Karamambo (manufactured by Technoroll)
Cloth type: tube knitting material: rayon surface state: with loop pile (b) roll: TX10 (manufactured by Kanuki Roller Mfg. Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the thickness of the cloth material was measured by the above method and the volume density was calculated, the thickness of the cloth material was 4000 μm and the volume density was 0.217 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 126, the pushing force was 30 N / m, and the rubbing force was 80 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 1.8, and the evaluation was A.

(Example 2)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was replaced from <Development Roll Condition 1> to the following <Development Roll Condition 2>.
<Development roll condition 2>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Karamambo (manufactured by Technoroll Co., Ltd.)
Cloth type: tube knitting material: rayon surface state: with loop pile (b) roll: TX30 (manufactured by Kanuki Roller Mfg. Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: A30 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 4000 μm and the volume density was 0.217 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 2.2, and the evaluation was A.

(Example 3)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 3>.
<Development roll condition 3>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth: Karamambo (manufactured by Technoroll Co., Ltd.)
Cloth type: Tube knitting Material: Rayon surface condition: Loop pile available (b) Roll: TX50 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: A50 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 4000 μm and the volume density was 0.217 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 60 N / m, and the rubbing force was 120 N / m. When the developed plate obtained by the above method was evaluated, it was found that the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 2.8, and the evaluation was A and the evaluation was A.

Example 4
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 4>.
<Development roll condition 4>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth: Karamambo (manufactured by Technoroll Co., Ltd.)
Cloth type: tube knitting material: rayon surface state: with loop pile (b) roll: TX10 (manufactured by Kanuki Roller Mfg. Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 4000 μm and the volume density was 0.217 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 15 N / m, and the rubbing force was 40 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was B, the average number of scratches on the plate surface was 0.8, and the evaluation was A.

(Example 5)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 5>.
<Developing roll condition 5>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Nylon molton (improved product obtained by replacing the surface pile of NEWMOL manufactured by Kauki Roller Manufacturing Co., Ltd. with nylon thread manufactured by Toray Industries, Inc.)
Cloth type: Tube knitting material: Nylon surface condition: With loop pile (b) Roll: TX10 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 3600 μm and the volume density was 0.345 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 157, the pushing force was 250 N / m, and the rubbing force was 180 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 1.6, and the evaluation was A.

(Example 6)
Except for changing the roll of the automatic developing machine from <Developing Roll Condition 1> to <Developing Roll Condition 6> below and developing the waterless lithographic printing plate precursor at a rotational speed of 500 rpm while transporting at a speed of 40 cm / min. Development was performed under the same conditions as in Example 1.
<Developing roll condition 6>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Nylon molton (improved product obtained by replacing the surface pile of NEWMOL manufactured by Kauki Roller Manufacturing Co., Ltd. with nylon thread manufactured by Toray Industries, Inc.)
Cloth type: Tube knitting material: Nylon surface condition: With loop pile (b) Roll: TX10 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 3600 μm and the volume density was 0.345 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 393, the pushing force was 250 N / m, and the rubbing force was 200 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 3.0, and the evaluation was A.

(Example 7)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 7>.
<Developing roll condition 7>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Nylon molton (improved product obtained by replacing the surface pile of NEWMOL manufactured by Kauki Roller Manufacturing Co., Ltd. with nylon thread manufactured by Toray Industries, Inc.)
Cloth type: Tube knitting material: Nylon surface condition: With loop pile (b) Roll: TX10 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 3600 μm and the volume density was 0.345 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 157, the pushing force was 300 N / m, and the rubbing force was 220 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 4.2, and the evaluation was B.

(Example 8)
The development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 8>.
<Developing roll condition 8>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth material: Nylon molton (improved product obtained by replacing the surface pile of NEWMOL manufactured by Kauki Roller Manufacturing Co., Ltd. with nylon thread manufactured by Toray Industries, Inc.)
Cloth type: Tube knitting material: Nylon surface condition: With loop pile (b) Roll: TX10 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 3600 μm and the volume density was 0.345 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 157, the pushing force was 400 N / m, and the rubbing force was 300 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of scratches on the plate surface was 9.0, and the evaluation was C.

Example 9
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 9>.
<Developing roll condition 9>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 157, the pushing force was 40 N / m, and the rubbing force was 100 N / m. The developed plate obtained by the above method was evaluated. As a result, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 3.0, and the evaluation was A.

(Example 10)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 10>.
<Developing roll condition 10>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX30 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: A30 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 157, the pushing force was 60 N / m, and the rubbing force was 120 N / m. When the developed plate obtained by the above method was evaluated, it was found that the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 3.8, and the evaluation was A.

(Example 11)
Except for changing the roll of the automatic developing machine from <Developing Roll Condition 1> to <Developing Roll Condition 11> below and developing the waterless lithographic printing plate precursor at a speed of 200 rpm while transporting the waterless lithographic printing plate precursor at a speed of 100 cm / min. Development was performed under the same conditions as in Example 1.
<Developing roll condition 11>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 63, the pushing force was 40 N / m, and the rubbing force was 60 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was B, the average number of plate surface scratches was 0.4, and the evaluation was A.

(Example 12)
Except for changing the roll of the automatic developing machine from <Development Roll Condition 1> to <Development Roll Condition 12> below and developing the waterless lithographic printing plate precursor at a rotational speed of 500 rpm while transporting at a speed of 25 cm / min. Development was performed under the same conditions as in Example 1.
<Developing roll condition 12>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 628, the pushing force was 40 N / m, and the rubbing force was 200 N / m. When the developed plate obtained by the above method was evaluated, it was found that the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 3.8, and the evaluation was A.

(Example 13)
Except for changing the roll of the automatic developing machine from <Developing Roll Condition 1> to <Developing Roll Condition 13> below and developing the waterless lithographic printing plate precursor at a speed of 600 rpm while transporting the waterless lithographic printing plate precursor at a speed of 20 cm / min. Development was performed under the same conditions as in Example 1.
<Developing roll condition 13>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 942, the pushing force was 40 N / m, and the rubbing force was 300 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 12.4, and the evaluation was C.

(Example 14)
Except for changing the roll of the automatic developing machine from <Developing Roll Condition 1> to <Developing Roll Condition 14> below and developing the waterless planographic printing plate precursor at a speed of 600 rpm while transporting the waterless lithographic printing plate precursor at a speed of 15 cm / min. Development was performed under the same conditions as in Example 1.
<Developing roll condition 14>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 100 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless planographic printing plate precursor was 1257, the pushing force was 40 N / m, and the rubbing force was 400 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 18.4, and the evaluation was D.

(Example 15)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 15>.
<Developing roll condition 15>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Cloth material: Cordon felt TA-1100 (Asahi Kasei Fibers Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon surface condition: Needle punch hole (b) Roll: TX10 (manufactured by Kauki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 490 μm, and the volume density of the cloth material was 0.237 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. When the developed plate obtained by the above method was evaluated, it was found that the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 3.8, and the evaluation was A.

(Example 16)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 16>.
<Developing roll condition 16>
The following (b) roll was fixed by sticking a (a) cloth material provided with a double-sided adhesive tape on the surface of the roll, thereby forming a developing roll.
(A) Fabric material: dc-fix (manufactured by Konrad Hornschuch AG)
Cloth type: Non-woven fabric Material: Nylon surface condition: With chemical bond (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 550 μm, and the volume density of the cloth material was 0.319 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 6.2, and the evaluation was B.

(Example 17)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was replaced from <Development Roll Condition 1> to the following <Development Roll Condition 17>.
<Development roll condition 17>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Cloth material: “Toraysee (registered trademark)” (manufactured by Toray Industries, Inc.)
Cloth type: Knitted material: Polyester (PET)
(B) Roll: TX10 (Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 480 μm, and the volume density of the cloth material was 0.435 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was B, the average number of plate surface scratches was 15.2, and the evaluation was D.

(Example 18)
The development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 18>.
<Developing roll condition 18>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Cloth material: “Silook (registered trademark)” (manufactured by Toray Industries, Inc.)
Cloth type: Textile material: Polyester (PET)
(B) Roll: TX10 (Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 200 μm, and the volume density of the cloth material was 0.445 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was B, the average number of plate surface scratches was 20.2, and the evaluation was D.

(Example 19)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to <Development Roll Condition 19> below.
<Developing roll condition 19>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Cloth: Denim fabric (Nisshinbo Co., Ltd.)
Cloth type: Textile material: Cotton (b) Roll: TX10 (manufactured by Kanuki Roller Manufacturing Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: E10 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 580 μm, and the volume density of the cloth material was 0.317 g / cm ³ . Further, the relative speed between the developing roll surface and the waterless planographic printing plate precursor was 126, the pushing force was 40 N / m, and the rubbing force was 100 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 36.6, and the evaluation was E.

(Example 20)
The development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 20>.
<Developing roll condition 20>
The following (a) cloth material was attached to the (b) roll, wetted with water and dried to shrink and fix the (a) cloth material to obtain a developing roll.
(A) Cloth: Karamambo (manufactured by Technoroll Co., Ltd.)
Cloth type: tube knitting material: rayon surface condition: with loop pile (b) roll: EVA sponge (manufactured by Fuji Chemical Co., Ltd.)
Material: Ethylene vinyl acetate copolymer (EVA)
Rubber hardness: E10 or less
Rubber thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 4000 μm and the volume density was 0.217 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 126, the pushing force was 8 N / m, and the rubbing force was 20 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was B, the development uniformity was C, the average number of scratches on the plate surface was 0.2, and the evaluation was A.

(Example 21)
The development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 21>.
<Developing roll condition 21>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: White EC270 (manufactured by Kanuki Roller Mfg. Co., Ltd.)
Material: Nitrile Butadiene Rubber (NBR)
Rubber hardness: A70 degree Rubber wall thickness: 20mm
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 126, the pushing force was 85 N / m, and the rubbing force was 140 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of scratches on the plate surface was 5.4, and the evaluation was B.

(Example 22)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was changed from <Development Roll Condition 1> to the following <Development Roll Condition 22>.
<Developing roll condition 22>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Roll: Stainless steel roll (manufactured by Yamato Kogyo)
Material: Stainless steel (SUS)
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 126, the pushing force was 85 N / m, and the rubbing force was 140 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of plate surface scratches was 11.2, and the evaluation was C.

(Example 23)
Development was performed under the same conditions as in Example 1 except that the roll of the automatic developing machine was replaced with <Developing roll condition 1> to <Developing roll condition 23> below.
<Developing roll condition 23>
The following (b) double-sided adhesive tape No. 532 (manufactured by Nitto Denko Co., Ltd.) was affixed, and (a) a cloth material was affixed thereon to form a developing roll.
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon surface condition: Thermal bond available (b) Roll: Urethane roll "13801" (manufactured by Okamoto Roller Manufacturing Co., Ltd.)
Material: Polyurethane (PU)
Roll diameter: 80 mm.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The relative speed between the developing roll surface and the waterless lithographic printing plate precursor was 126, the pushing force was 85 N / m, and the rubbing force was 140 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was A, the development uniformity was A, the average number of scratches on the plate surface was 10.4, and the evaluation was C.

(Comparative Example 1)
Using the following (a) cloth material, the surface of the exposed original plate was manually rubbed for development.
(A) Cloth: Heisease (Asahi Kasei Fibers Co., Ltd.)
Cloth type: Textile material: Cotton.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 270 μm, and the volume density of the cloth material was 0.111 g / cm ³ . The pressing force of the cloth material onto the plate surface was 1000-1500 N / m and the rubbing force was 80 N / m as measured using a prescale. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was C, the development uniformity was E, the average number of plate surface scratches was 32.4, and the evaluation was E.

(Comparative Example 2)
Using the following (a) cloth material, the surface of the exposed original plate was manually rubbed for development.
(A) Cloth material: Handi-Pads (manufactured by Fiberweb)
Cloth type: Non-woven fabric Material: Cotton.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 3000 μm, and the volume density of the cloth material was 0.083 g / cm ³ . The pressing force of the cloth material onto the plate surface was 1000-1500 N / m and the rubbing force was 110 N / m as measured using a prescale. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was C, the development uniformity was E, the average number of plate surface scratches was 6.2, and the evaluation was B.

(Comparative Example 3)
The following (a) cloth material was applied to the platen of the (b) disk friction device and double-sided adhesive tape No. The surface of the exposed original plate was rubbed with a rotating disk having a rotation axis perpendicular to the plate surface, and developed with 532 (manufactured by Nitto Denko).
(A) Fabric material: ELTAS SOFT TA-3000 (manufactured by New Tokyo Asahi Co., Ltd.)
Cloth type: Non-woven fabric Material: Nylon Surface condition: With thermal bond (b) Disc friction device: CMP experimental device MAT ARW-8C1MS (manufactured by MAT)
Platen diameter: φ200mm
Platen and head speed: 100 rpm
Load: 450N / m
Friction time: 2 minutes.

When the same evaluation as in Example 1 was performed, the thickness of the cloth material was 380 μm, and the volume density of the cloth material was 0.179 g / cm ³ . The pressing force of the cloth material onto the plate surface was 450 N / m, and the rubbing force was 30 N / m. When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was D, the development uniformity was E, the average number of plate surface scratches was 14.6, and the evaluation was C.
(Comparative Example 4)
Using an automatic processor TWL-1160GII (manufactured by Toray Industries, Inc.), the waterless lithographic printing plate precursor is conveyed at a speed of 60 cm / min, and water is applied to the surface of the original plate with two rolls at a rotational speed of 275 rpm. While developing, rubbing to develop. The developing roller used the following channel brush.
<Channel brush condition>
Material: Polybutylene terephthalate (PBT)
Single yarn diameter: 100 μm
Brush diameter: 126mm
The relative speed of the channel brush surface and the waterless lithographic printing plate precursor was 181; the pushing force was 450 N / m; and the rubbing force was 60 N / m.

  When the developed plate obtained by the above method was evaluated, the fine dot reproducibility was E, the development uniformity was E, the average number of plate surface scratches was 8.4, and the evaluation was B.

  The conditions and evaluation results of Examples 1 to 23 and Comparative Examples 1 to 4 are shown in Tables 1 and 2.

1 Development Roll 2 Cloth Material 3 Development Roll Shaft 4 Receiving Stand 5 Transport Roll 6 Pass Line 7 To Washing Unit

  The direct-drawing waterless lithographic printing plate obtained by the development method of the present invention can be used in general printing fields (commercial printing, newspaper printing, printing on a non-absorbent material such as a film, a resin plate, or metal). Further, the present invention can be applied to the display field such as PDP and LCD, and the printable electronics field in which a wiring pattern is produced by a printing method.

Claims (15)

A developing device for developing a waterless lithographic printing plate precursor after exposure, the developing device supporting a rotatable developing roll that rubs the surface of the waterless lithographic printing plate precursor, and a waterless lithographic printing plate precursor It has a developing unit composed of a cradle and a transport device that transports the waterless planographic printing plate precursor,
The developing roll has a cloth material fixed on a support, and the developing roll is installed at the top of the cradle with a clearance through which a waterless lithographic printing plate precursor can pass,
The transport device has a function of transporting the waterless lithographic printing plate precursor supplied to the developing unit through a clearance between the cradle and the developing roll,
The developing unit is a developing device for a waterless lithographic printing plate precursor having a function of rubbing the surface of the supplied waterless lithographic printing plate precursor with the developing roll. The developing device for a waterless lithographic printing plate precursor according to claim 1, wherein the cloth material has a volume density of 0.12 to 0.40 g / cm ³ . The developing device for a waterless lithographic printing plate precursor according to any one of claims 1 and 2, wherein a single yarn diameter of fibers constituting the surface of the cloth material is 30 µm or less. The developing device for a waterless lithographic printing plate precursor as claimed in any one of claims 1 to 3, wherein the fiber constituting the surface of the cloth material has a Young's modulus of 3 GPa or less. The developing device for a waterless lithographic printing plate precursor according to any one of claims 1 to 4, wherein the cloth material is a knitted fabric or a woven fabric having a pile on its surface. The developing device for a waterless lithographic printing plate precursor according to any one of claims 1 to 4, wherein the cloth material is a nonwoven fabric having fiber bonds. The developing device for a waterless planographic printing plate precursor according to any one of claims 1 to 6, wherein the support has a durometer hardness of A10 to 50 degrees according to JIS K 6253 standard. The developing device for a waterless lithographic printing plate precursor as claimed in any one of claims 1 to 7, wherein the support has rubber disposed on at least a part of its surface. The waterless lithographic printing according to any one of claims 1 to 8, wherein the developing unit is configured to rub the surface of the supplied waterless lithographic printing plate precursor with the developing roll in the absence of a liquid. Plate master development equipment. A method for producing a waterless lithographic printing plate that obtains a waterless lithographic printing plate from a waterless lithographic printing plate precursor having an ink repellent layer on the surface through an exposure step and a development step, wherein the exposure step is converted into digital data. A step of exposing the waterless lithographic printing plate precursor with a laser beam scanned on the basis, and the developing step uses the developing device according to any one of claims 1 to 9, and the exposing step. A method for producing a waterless lithographic printing plate, which is a step of removing an ink repellent layer in an exposed area from a waterless lithographic printing plate precursor exposed by A development method in which the surface of a rotated developing roll is brought into contact with the surface of a waterless lithographic printing plate precursor after exposure in the absence of a liquid and rubbed, wherein the developing roll is applied to the waterless lithographic printing plate precursor. A method for developing a waterless lithographic printing plate precursor having an indentation force of 400 N / m or less. The waterless planographic printing according to claim 11, wherein the ratio of the peripheral speed of the developing roll surface at a position where the surface of the printing plate precursor and the surface of the developing roll are in contact with the conveying speed of the printing plate precursor is 50 to 1000. Development method of plate precursor. When the surface of the printing plate precursor and the developing roll are brought into contact with each other and rubbed, the moving direction of the printing plate precursor and the rubbing direction of the developing roll surface are the same direction as the developing roll at least once, and the printing plate The method for developing a waterless lithographic printing plate precursor according to claim 11 or 12, wherein the printing plate precursor is brought into contact with the developing roller whose direction of movement of the original plate and the rubbing direction of the surface of the developing roller are opposite to each other at least once. When the surface of the printing plate precursor and the developing roll are brought into contact and rubbed, the developing roll and the surface of the printing plate precursor are brought into contact with each other in the entire length of the printing plate precursor in a direction parallel to the developing roll. The method for developing a waterless lithographic printing plate precursor as described in any one of 13 above. A method for producing a waterless lithographic printing plate that obtains a waterless lithographic printing plate from a waterless lithographic printing plate precursor having an ink repellent layer on the surface through an exposure step and a development step, wherein the exposure step is converted into digital data. It is the process of exposing this waterless lithographic printing plate precursor with the laser beam scanned based on, and this image development process uses the image development method in any one of Claims 11-14, The said exposure process A method for producing a waterless lithographic printing plate, which is a step of removing an ink repellent layer in an exposed area from a waterless lithographic printing plate precursor exposed by

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