JPS60205544A - Production of photosensitive printing plate - Google Patents

Abstract

PURPOSE:To prevent the decrease in vacuum adhesion owing to a decrease in the height in the projecting part of a matte layer in the stage of vacuum adhesion by subjecting the matte layer to a pressurizing treatment. CONSTITUTION:A matte layer is formed on the surface of a photosensitive printing plate and thereafter the matte layer is exerted with 0.8-10kg/cm<2> pressure to decrease and level off the height in the projecting part of the matte layer. The matte layer is formed by fixing pulverous resin powder to the photosensitive layer by air spray, electrostatic air spray or the like. The pressure is exerted by a method of vacuum adhesion to glass, pressing with a metallic plate, press welding by rolls, etc. The pressurization is executed at <=50 deg.C so that the height in the projecting part after the pressurization attains a 1-15mu range. The effect is high with a photosensitive lithographic printing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for manufacturing a photosensitive printing plate, and particularly to a method for manufacturing a photosensitive printing plate with improved vacuum adhesion.

[Prior art]

Conventionally, when exposing a photosensitive printing plate to light through an original image, in order to make the original image completely adhere to the surface of the photosensitive layer of the photosensitive printing plate, the photosensitive printing plate and the
A method was used in which the original I[lIi were placed one on top of the other, and a vacuum was created between the rubber sheet and the bonded glass to bring them into close contact.

In order to shorten the time required for this vacuum and close contact, for example, as described in Japanese Unexamined Patent Publication No. 111102/1984, a micropattern consisting of a coated area and a non-coated area is provided on the photosensitive f@. A sex print version is known. Further, Japanese Patent Application Laid-open No. 12974/1983 discloses a method of powdering a solid powder and transferring it onto a photosensitive printing plate by heat. Furthermore, Japanese Patent Application Laid-open No. 5Y-34558 discloses a method of spraying an aqueous liquid in which a resin is dissolved or dispersed onto the surface of a photosensitive layer and drying it.

However, such fine pattern layers, solid powder layers, etc. [hereinafter referred to as "matte layers"]. ] The photosensitive printing plate provided with this had the disadvantage that the height of the convex portions of the matte layer was reduced by pressure, resulting in a decrease in vacuum adhesion.

For example, a photosensitive printing plate printed on multiple sides, or
After vacuum-adhering the original image, I found that there was some dust on the film surface, and after removing it, I applied the original image again to the same photosensitive printing plate, as in the case of vacuum-adhering. t-* May be brought into close contact with Shinnitri. In such a case, with a photosensitive printing plate on which a matte layer has been formed on the surface using a conventional method, the original image can be brought into close contact with the original image in a relatively short time during the first A-tightening, but at this time, The convex portions of the mat layer are crushed by atmospheric pressure. For this reason, when the original picture is vacuum-adhered again, the time required becomes extremely long.

A processing method has been implemented in which a photosensitive printing plate provided with a cut layer is once wound up into a coil, and then cut at high speed and packaged. This winding is performed under high tension in order to prevent coil misalignment, winding failure, and the like. Therefore, the closer to the center of the one-turn coil, the greater pressure is applied to the surface of the photosensitive printing plate, crushing the convex portions of the matte layer, and as a result, the vacuum adhesion deteriorates.

In this way, the convex parts of the mat layer are crushed by pressure,
As a result, the cause of the decrease in vacuum adhesion is that the resin used to form the convex portions of the mat layer is soft.
Also, it is thought that the large convex portions, which greatly contribute to vacuum adhesion, are selectively crushed.

Therefore, in order to prevent the deterioration or fluctuation of vacuum adhesion, the convex portions of the mat layer should be made of a hard material, or
It can be seen that in a certain calendar, the pressure shadow 4t- can be reduced by making the height distribution of the convex portions as narrow as possible and distributing the pressure to as many convex portions as possible. Inventor 4!
focused on the latter nine points of Special 1c and conducted a thorough investigation.

[Purpose of the invention]

An object of the present invention is to provide a method for preparing a photosensitive printing plate with less deterioration or fluctuation in vacuum adhesion.

[Structure of the invention]

As mentioned above, the inventors of the present invention aimed to narrow the height distribution of the convex portions of the mat layer as much as possible, and as a result of various studies on methods for dispersing pressure and reducing the influence of pressure, we found that the mat J After forming @.

We have discovered that the above objects of the present invention can be achieved by applying appropriate pressure to crush the convex portions of the matte layer, and have come to form the present invention6. This method of producing a photosensitive printing plate is characterized in that after forming a matte layer, pressure is applied to the matte layer to reduce the height of the convex portions of the matte layer and to average the heights.

By the way, it is known to apply pressure with a roll or the like in order to adhere solid fine powder, which is a material for forming convex portions of a matte layer, to the surface of a photosensitive printing plate.
In the lower right column, line 14 of page 3 of Publication No. 5-12974, it is stated that "a means for applying pressure to the solid powder by means of a roll or the like may be used in combination." However, he later added, ``In addition to the methods described above, various methods of fixing the solid powder to the surface of the photosensitive printing plate can be considered, but in short, any method that fixes the solid powder and the photosensitive layer to the extent that it is not extremely deformed is sufficient. As is clear from the statement,
This means that pressure is applied not to reduce the height of the formed IT particles by pressure, but to bring the solid fine powder into complete contact with the photosensitive layer. When fine powder is fused to a surface using heat, the viscosity of the molten resin is very high, so it takes a long time to completely adhere to the surface. However, holding it at high temperatures for long periods of time is not foolish as it increases manufacturing costs.

This is not preferable because it does not have an adverse effect on the photosensitive layer.6 Therefore,
As disclosed in Japanese Patent Application Laid-Open No. 55-101951, fine powder can be completely coated on the surface of a photosensitive printing plate in a short period of time by bringing it into contact with a heating roll having a surface with good mold releasability and thermally fusing it. This is to bring it into close contact with the The roll used at this time is made of a fluororesin such as Teflon (trade name), which is not as hard as the gold striped roll, so the matte particles are not completely crushed. Since this method uses a heating roll, the matte particles are thermally fused to the surface of the photosensitive printing plate, and then a part of the sphere is flattened by the surface tension of the resin itself, which forms the particle'fc grooves. It solidifies into the shape that can be obtained by cutting it. Therefore, the height of the protrusions formed on the surface is not proportional to the size of the matte particles, but the distribution of the heights of the protrusions is determined by the particle distribution of the matte particles.

In addition, when the solid powder remaining in the photosensitive layer is to be locally dissolved and fixed to the photosensitive layer, apply light pressure to push the fine powder a little into the photosensitive layer to dissolve the solvent. Although it is desirable to bring the fine powder into sufficient contact, the height distribution of the convex portions of the pine tops obtained in this way is still wide, and the adhesion of such photosensitive printing plates is significantly reduced by pressure. This shortcoming has not been completely resolved.

In this way, applying pressure to matte particles was known, but the purpose of this was to make the matte particles stick), and not to prevent pressure-induced fluctuations in vacuum adhesion. .

In addition, in practice, it has not been possible to prevent or reduce variations in vacuum adhesion due to pressure by such a method.In other words, in order to average the height of the convex portions of the matte layer, after forming the matte layer, No attempt had been made to apply pressure.

The present inventors surprisingly found that after forming the matte layer, by lowering and averaging the height of the matte layer using pressure, a photosensitive printing plate that is resistant to pressure and has good vacuum adhesion can be obtained. We have discovered that the matte layer forming method applicable to the present invention is as follows.

A method of making the photosensitive layer uneven (making it uneven during coating, adding a matting agent internally, making it uneven when drying using a foaming agent), a method of making the top layer that does not contain the photosensitive material uneven (making it uneven when applying a matting agent) There are various methods such as a resin layer containing a resin layer, a matte layer consisting of a coated area and a non-coated area).

A method of forming a matte layer consisting of a coated area and a non-coated area is advantageously used because it has less adverse effect on vacuum adhesion and other properties. In particular, it is preferable that the coated part be removed during development, and the following (a Of particular concern are copolymers containing the monomer units of ), (b) and (c).

(,) at least one monomer selected from the group consisting of alkyl acrylates whose alkyl residues have 2 to 10 carbon atoms and alkyl methacrylates whose alkyl residues have 4 to 10 carbon atoms; unit.

(b) at least one monomer unit selected from the group consisting of styrenes, acrylonitriles, methyl methacrylate and ethyl methacrylate.

(C) At least one monomer unit selected from the group consisting of acrylic acid, methacrylic acid, maleic mJ itaconic acid, alkali metal salts and ammonium salts thereof.

The above monomer unit Ca) is a component that imparts adhesion to the surface of the photosensitive layer, and specific examples thereof include ethyl acrylate, n-propyl acrylate, in-amyl acrylate, n-butyl acrylate, in-butyl acrylate, Amyl acrylate, inamyl acrylate, n-hexyl acrylate, 2-ethylhexyl acrylate, n-octyl acrylate, n-decyl acrylate, n-butyl methacrylate, indityl methacrylate, n-amyl methacrylate% 2-ethylhexyl methacrylate , n-octyl methacrylate, n-decyl methacrylate, etc. @ The above seven units (b) have resistance to pressure.
Specific examples include styrene, 0-methylstyrene + m-methylstyrene, p-methylstyrene, 2,4-methylstyrene, 2,5-dimethylstyrene, 3.4-X)methyl Styrene, 3.5-trimethylstyrene, 2,4.5-trimethylstyrene, 2.4.
6-trimethylstyrene, 0-ethylstyrene, m-ethylstyrene, p-ethylstyrene, 3.5-S) ethylstyrene, 2.4.5-triethylstyrene, p-n
-butylstyrene, m -5ec-butylstyrene, m
-tart-ethylstyrene% p-hexylstyrene,
p-n-hebutylstyrene, p-2-ethylhexylstyrene, 0-fluorostyrene, m-fluorostyrene, p-fluorostyrene, o-chlorostyrene% m-chlorostyrene, p-chlorostyrene, 2.3 -dichlorostyrene, 2,4-dichlorostyrene. 2.5-zochlorostyrene, 2.6-dichlorostyrene% 3.4-
Dichlorostyrene. 3,5-dichlorostyrene, 2.3
．． 4゜5.6-Bentaf dayrostyrene, m-)lifluoromethylstyrene, 0-cyanostyrene% m-cyanostyrene, m-nitrostyrene, p-nitrostyrene, p
-ymethylaminostyrene, acrylonitrile, α-chloroacrylonitrile, α-bromoacrylonitrile,
Included are α-trifluoromethylacrylonitrile, α-trifluoromethylacrylonitrile, methyl methacrylate, and ethyl methacrylate.

The above monomer unit (c,) is a component that improves solubility in a developer, and specific examples thereof include acrylic acid,
Sodium acrylate, potassium acrylate, ammonium acrylate, methacrylic acid, sodium methacrylate, potassium methacrylate, ammonium methacrylate, maleic acid, sodium maleate, potassium maleate, ammonium oleate, itaconic acid, sodium itaconate, Contains potassium itaconate, ammonium itaconate, etc.

In such a copolymer, one mono unit (a)% (
The amounts of b) and (C) are 10 to 70 weights, 2
0 to 80 weight boxes and 6 to 50 weight boxes are preferred. As the amount of monomer units (a) becomes smaller than 10% by weight, the adhesion of the copolymer to the surface of the photosensitive layer decreases, while as the amount of monomer units (a) increases, The pressure resistance of the combination decreases.

Also, the amount of monomer unit (b) is 20 times! As the amount of the copolymer decreases, the hardness of the copolymer decreases and the pressure resistance decreases.On the other hand, as the amount exceeds 80% by weight, the solubility of the copolymer in the developer decreases. Moreover, the adhesion force to photosensitive I- is reduced.

Furthermore, as the number of monomer units (C) becomes less than 6 times, the solubility of the copolymer in the fA imaging solution becomes poor, while as it becomes more than 50% by weight, the copolymer becomes weaker. Furthermore, the adhesion force to the surface of the photosensitive layer is also reduced. Therefore, particularly preferred amounts of monomer units (a), (b) and (C) are 15 to 50 weight units and 40 to 40 weight units, respectively.
They are 70 heavy Kurachi and 10 to 25 heavy S-chi.

The above copolymer can be prepared by solution polymerizing in an organic solvent, evaporating it to dryness, and grinding it into a fine powder using a pulverizer, or adding a portion of component (C) acrylic acid, methacrylic acid, maleic acid, or itaconic acid to sodium chloride. It can be obtained as an aqueous solution of the copolymer as a salt, potassium salt, or ammonium salt. Alternatively, in the same manner as the usual latex synthesis method, raw monomers may be emulsified in water with a surfactant and then emulsion polymerized using a polymerization initiator such as potassium persulfate to obtain an aqueous dispersion. @ The copolymer may contain a filler. Examples of fillers include silicon dioxide, d+zinc 2, titanium oxide% zirconium oxide, 127 particles, and alumina.

Included are polymer particles (eg, particles of polymethyl methacrylate, polystyrene, phenolic resin, etc.). Two or more of these can be used in combination.

Methods of coating these resins to form a matte layer include a method of solidifying fine resin powder onto a photosensitive layer using heat or a solvent (Japanese Patent Application Laid-open No. 12974/1983);
There is a method in which an aqueous liquid in which a resin is dissolved or dispersed is grayed and dried (Japanese Unexamined Patent Publication No. 57-54558), but from the viewpoint of safety, manufacturing stability, cost, etc.
The matting method described in JP-A-57-34558 (air spray method, airless through method, (B)ffi air spray method, electrostatic atomization electrostatic coating method, etc.) is preferable and has a high adhesion rate. Particularly preferred are electrostatic atomization and electrostatic coating methods.

In the present invention, after forming the matte layer, the height of the protrusions is lowered by pressure, so it is preferable to keep the height of the protrusions higher than before when forming the matte layer, especially when the height is 1 to 1. A range of 30μ is preferred. To increase the height of the convex part, Japanese Patent Application Laid-Open No. 55
In the case of using the method of JP-A No. 12974, it is better to increase the particle size of the fine powder, and in the case of the method of JP-A-57-34558, it is better to increase the concentration of the matte liquid, increase the size of the fine particles of the matte liquid, and increase the adhesion of the fine particles. Raise the temperature of the time,
It is preferable to lower the humidity and reduce the amount of post-humidification, and it is especially good to raise the liquid temperature by 111 degrees.The influence of the size and width of the convex portions and the amount (number) on the vacuum adhesion time #rJ:, Although it is small compared to the influence of the height of the convex parts, it has a large influence on the adhesion strength and pressure resistance. Therefore, the size and width of the convex portion is 5 to 200μ,
The amount (number) is 1 to 1000 pieces/llll112. Preferably, 5 to 500 pieces/2 is appropriate. This range]
If it is low, the adhesion strength and pressure resistance of the convex portions will be low, and if it is higher than this range, it will have an adverse effect on the developability, tone reproducibility, etc. of the photosensitive printing plate.

Pressure is applied to the mat layer thus formed to reduce the height of the convex portions. Pressure can be applied by any method, such as vacuum-adhering a glass plate, stacking a metal plate on the surface and pressing it, or pressing it onto a roll of metal, etc., but the point is that it is easy to mass-produce. The best method is to press it onto a roll. The applied pressure is the pressure applied when the original painting is vacuum-adhered, that is, 0.0, which is close to atmospheric pressure.
It is preferable that it is 8Kg/cm2 or more. This pressure is determined by the height and shape of the convex portions of the mat layer to be formed.
It varies depending on the number, material, material of the photosensitive layer, desired height of the convex portion, pressurizing method, material of the pressurizing member, post-processing conditions such as winding p, etc., but generally 0.8 to 10 Kg/
A range of cm2 is appropriate. The material for the pressure member may be any hard material such as matte layer forming resin, preferably metal, glass, reinforced plastic, etc. Photosensitive printing using such a pressure member When pressure is uniformly applied to the plate surface, a large force is selectively applied to the taller protrusions, so these are selectively crushed and the heights of the protrusions are averaged out. Pressure must be applied at a temperature at which the convex portion-forming resin does not undergo thermal fluidization. Therefore, the temperature at the time of pressurization varies depending on the type of resin, but generally 50° C. or lower (usually room temperature is sufficient). The height of the convex portion after pressurization is preferably in the range of 1 to 15 μm. If it is less than 1μ, the vacuum adhesion is poor, and if it is more than 15μ, the distance between the photosensitive layer and the film becomes too large, resulting in poor % tone reproducibility and burn-out. Further, the pressure may be applied uniformly over the entire surface of the photosensitive printing plate, or may be applied only to the central portion that is used in close contact with the original film.

The photosensitive printing plate, which is the object to which the resin is attached as described above, is basically a support with a photosensitive layer provided on it, and is particularly used for making lithographic printing plates. In the case of photosensitive lithographic printing plates, the effects of the present invention are significantly exhibited. Various supports for such photosensitive lithographic printing plates are known, and details thereof can be found in British Patent Publication No. 2030.
It is described in the specification of No. 509A. Further, the photosensitive layer may be made of a diazo resin, an 0-quinonediazide compound, a photosensitive molecule, a photopolymerizable composition, or a photosensitive resin. These details are also explained in detail in the above-mentioned published specifications.
5't/m2.

〔Effect of the invention〕

If the height of the convex part is reduced by applying pressure in this way, and the height of the convex part is averaged out, the density of the convex part is thought to increase, and since the pressure is dispersed, the convex part is reduced by the pressure. There is very little deformation, and the vacuum adhesion will not deteriorate even if the vacuum adhesion operation is repeated several times.
Further, even when wound up into a roll, there is almost no difference in vacuum adhesion between the center part and the outer part. Furthermore, even if the conditions during the formation of pine)/- vary and the shape, especially the height, of the convex part changes, the height of the convex part is averaged by this pressure treatment, so it is always stable. Can form a matte layer,
A stable vacuum contact time can be ensured.

〔Example〕

Examples of the present invention will be specifically shown below, but the present invention is not limited thereto.

Example 1 and comparative example as b aluminum plate jig 1003 style with thickness 0.24,
Length 30 mm, continuous nylon brush and 400 mm
Mesunyu's arm mistletoe - Grained using water suspension fa solution and thoroughly washed with water - This board was immersed in a 25% sodium hydroxide aqueous solution at 45°C for 9 seconds to perform etching. After washing with water, it was further etched with 2O It was immersed in nitric acid for 20 seconds and washed with water. The amount of etching on the grained surface at this time is approximately 3 P.
/ m2. Next, put this board in 7-thiosulfuric acid? A DC anodic oxide film of 5P/m2 at a current density of 15A/dm2 was applied as a solution to the support, which was then washed with water and dried.This support was subjected to the condensation polymerization of acetone and pyrogallol as described in Japanese Patent Publication No. 43-28405 Wi. Naphthoquinone-1,2-cyacyto-5- of polyhydroxyphenyl obtained by
1 part by weight of sulfonic acid ester? A photosensitive layer is prepared by dissolving 2 parts by weight of lac-type phenol formaldehyde resin in 20 parts by weight of 2-methoxyethyl acetate and 10 parts by weight of methyl ethyl ketone, and is coated on the above support and dried to form a matte layer as described below. A photosensitive lithographic printing plate is prepared by applying a resin liquid through the coating to form a matte layer, and then pressurizing this at room temperature using a metal roll (measured using a pre-school manufactured by Fuji Photo Film Co., Ltd.). 4-5
Kg / 2) In addition, the initial tension was increased to 400
Kf, and the tension when winding 3000m is 200KF.
The sample 1 was prepared by winding up the sample while continuously reducing the tension so that it became 1003+111X800 and then cutting and packaging at high speed. Comparative sample a was prepared in the same manner except that no pressure was applied using a metal roll. In addition, comparative samples were prepared in the same manner, except that no pressure was applied using a gold dove roll and the resin liquid concentration was changed. Resin liquid composition,
Processing conditions are shown in Table IK. In addition, for all samples, the atomization head rotation speed of the rotating/uniform electrostatic atomizer was 25,000 r.
pm, the amount of resin liquid fed was 4 Qml/min, the voltage applied to the atomizing head was -90 kV%, the crystallinity of the coated layer was 25°C, the relative humidity was 50°, and about 2.5 seconds after coating. , Blow steam onto the applied surface and t! After 3 seconds of humidification, warm air with a temperature of 60C and a humidity of 10C was applied to each sample near the winding core, around the middle (1500m), and on the outside of the winding *.
3000m), we observed matte particles using an electron microscope, and used a vacuum contact printer to print the film original plate (s).
Vacuum warping time (first time) when two sowIax650++ seats are stacked and vacuum-adhered, and vacuum adhesion when vacuum is applied for 2 minutes, the plate and film t-*b are removed, and vacuum-adhesion is performed again. Time (second time) was measured.1
Also, sandals 1 near the outside (3000m) of the winding
1:, film original picture and 1! ! 30 amps after wearing
After exposure with a Kagen arc lamp at a distance of 70 m,
0P-5 (Product name: Fuji Photo Film Co., Ltd. W developer)
25. with a 6-fold dilution of At C, it was held for 60 seconds. The exposure time at this time was set to a point where the 5th step was completely clear in a gray scale with a density difference of 0.15, and it was observed to what extent the minimum halftone dot of the film original image was reproduced.

These results are shown in Table 2.

A photosensitive lithographic printing plate according to the prior art is a sample. The first vacuum contact time of the outer Sunsol of the roll J4fL is 6
5 seconds, whereas the second vacuum contact time was longer at 45 seconds. This indicates that the convex portion was crushed by the first vacuum adhesion. In this sample, as the winding core 111 approaches, the vacuum adhesion time changes from 35 seconds (outside) to 45 seconds (middle) to 65 seconds (
The winding core part) is longer. This is due to the fact that the high convex part is pushed in on the winding 8 side from the % electron microscopy observation.
It turned out that it was because the height was decreasing @Also,
By increasing the resin liquid concentration, it is possible to increase the height of the convex portion without changing its diameter (sample a). This makes it possible to obtain a vacuum contact time of 56 seconds, which is comparable to the outer sample of Sample 1, even at the core. but,
The first vacuum adhesion time for the outer sample of the winding flap was 20 seconds, while the second vacuum adhesion time was 26 seconds. ),
The vacuum adhesion time is significantly different at the winding core (36 seconds). This is because even if the height of the convex part is increased, the same behavior with respect to pressure is observed. Electron microscopic observation shows that the winding core It was observed that the high convex part was being crushed from above. In addition, regarding the minimum halftone dot reproducibility, while the gray and sample without matte layer were able to reproduce 2-inch, the minimum halftone dot of 2-inch disappeared in sample a, and up to 3-inch dot. I just couldn't reproduce it. This is because the distance between the grating and the film was too wide because the height of the convex portion was high.

On the other hand, sample 1 according to the present invention was used for the first time (56 seconds);
Second time (37 seconds), further outside (36 seconds), middle (68 seconds)
The vacuum adhesion time was very stable (40 seconds) even at the winding core. Also, the minimum halftone dot reproduction was 2%.
was reproduced with good results. Observation with an electron microscope revealed that the upper part of the tall convex part was pushed in by the pressure applied by the metal roll. For this reason, the matte layer of Sample 1 of the present invention is strong against pressure and is not crushed any further at the winding core or after vacuum adhesion, providing a stable vacuum adhesion time. It is.

Example 2 In Comparative Example, the resin liquid concentration was set to 11.5 cm, and the film was cut into 1003 orders x 800 questions without being rolled up.The film was then brought into close contact with a pressure-bonded glass for 2 minutes using a printer without budding with the original film. When this grade was layered with a film and the vacuum adhesion time was measured, it was very stable at 65 seconds (first time) and 37 seconds (2 (!21 times)), and the minimum halftone dot reproducibility was also good. There was @ Example 5 and Comparative Example C In Example 1 and Comparative Example, one roll was not taken.
The same operation was repeated except that the pieces were cut into 1001n and 1001n parrots (these are referred to as Example 3 and Comparative Example C, respectively).
. At this time, the first vacuum bonding time of these samples, in which the appropriate layer forming strips were made to #I as shown in Table 6, was measured. The results are shown in Table 6. In Example 3 according to the present invention, the manufacturing conditions were 01 I ＾λ> Q −/,
t J-11 + h included - Table 6 Example 4 and Comparative Example d Styrene-acrylic bush-notyl acrylate (ratio 4
5:30:20) The copolymer was pulverized using a supersonic jet pulverizer and classified using a classifier to obtain unidirectional diameters of 0.5 to 40μ (Example 4) and 0.5μ to 40μ, respectively (Example 4). 5~
A heat-fusible fine powder of 50'llC Comparative Example d) was obtained. Before spraying as shown in Example 1, the surface of the photosensitive lithographic printing plate was coated with 1/4 of these heat-fusible fine powders using a soufflage gun.
Uda ring (approx. 170 pieces/11112), 15
After being exposed to a nitrogen bath at 0°C for 10 seconds to make it wet, Example 4 was further crimped with a full-day roll (approximately 2Kg/cwr2
= blur scale measurement). This is 1003rrr
After cutting to rR×8001111, vacuum adhesion was examined.

Table 4 It can be seen that Comparative Example d had large phagocytosis at the first and second times and was weak against pressure, whereas Example 4 was strong against pressure. In Example 4, it was found through electron microscopy that tall matte particles were pressed in by pressure from above and exhibited strong resistance to pressure.

Showa 59. , 16th 1, Incident Indication: 1982 Patent Application No. 62965 2,
Title of the invention Method for manufacturing photosensitive printing plates 3, Relationship with the case of the person making the amendment Applicant name (520) Fuji Photo Film Co., Ltd. 4, Agent 5, Date of amendment order Initiator 6, Subject of amendment Description Column 7 of the detailed description of the invention, page 15, line 5 of the statement of contents of the amendment, "matte layer 1" is referred to as "matte layer",
I am corrected. 'ノ＜'7''s-

Claims (3)

[Claims] (1) After forming a matte layer on the surface of the photosensitive printing plate,
The mat! - A method for producing a photosensitive printing plate characterized by applying pressure to reduce the height of the convex portions of the matte layer and average them. (2) The method for producing a photosensitive printing plate according to claim 1, wherein the pressure is 0.8 to jOh/width2. (3) The method for preparing a photosensitive printing plate according to claim 2, wherein the matte layer consists of a coated area and a non-coated area that are removed during development.