JPH036563A - Production of intaglio printing plate - Google Patents

Abstract

PURPOSE:To improve plate wear by applying release agent layers in the form of thin films on the surface in cells and the surface of a base material and laminating protective layers in the form of thin films on the surface of the base material and the surface in the cells after exposing development using a photosensitive resin. CONSTITUTION:The release agent layers 3 are applied in the form of thin films on the surfaces in the cells 2 and on the base material 1 and the positive type photosensitive resin 4 is packed into the cells 2 and is solidified by drying. A negative type transparency photographic original plate is superposed on the base material 1 packed with the photosensitive resin 4 and is subjected to the exposing development. The protective layers 8 are thereafter formed in the form of thin films on the base material 1 and in the cells 2. The wear resistance to gravure doctor blade is improved in this way and the easy scraping away of the excess printing ink sticking to the plate surface is possible. In addition, the preservable property of the printing plate is improved.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is a method for manufacturing an intaglio printing plate or a gravure printing plate, in which cells having a predetermined shape and depth are filled with a photosensitive resin. The present invention relates to a plate-making method for producing a printing plate having a desired gradation by exposure and development.

(Prior art) A photosensitive resin is coated and filled into the cells of a printing plate base material in which gravure alleles of a certain depth have been formed, and a transmission type photographic original plate is aligned with the base material, exposed and developed to obtain the desired result. A method of manufacturing a gravure printing plate having a cell depth of gradation is generally known.

However, in the above conventional method, the photosensitive resin as an unexposed area is exposed to the outside in the gravure cell after the gravure printing plate is formed, and the resin undergoes a photodecomposition reaction due to external light. It becomes brittle and loses printing durability. Also,
When using the printing plate base material again after printing is completed, remove the photosensitive resin inside the plate cell.

It is extremely difficult to completely remove it.

(Object of the invention) The present invention is capable of removing the photosensitive resin used for gradation reproduction from inside the cells formed in advance at a certain depth on the printing plate base material, so that it can be used again as the printing plate base material. The purpose is to prevent the photodecomposition reaction of the photosensitive resin formed inside the cells and to increase the printing durability of printing plates in intaglio and gravure printing. .

(Structure of the Invention) The present invention comprises a process of forming intaglio cells on the surface of a printing plate base material using an engraving method and/or an etching method, and applying a release agent layer in the form of a thin film within the formed cells and on the surface of the base material. process, filling the cell with a positive photosensitive resin and drying and solidifying it, overlaying a negative transmission photographic original plate on the substrate filled with the photosensitive resin and exposing and developing it, the substrate and the cell after development. This is a method for producing an intaglio printing plate, which comprises the step of forming a protective layer in the form of a thin film inside the intaglio printing plate.

Further, in the method for producing an intaglio printing plate of the present invention, the surface of the printing plate substrate must have at least a gold R layer made of aluminum or copper. In the present invention, the release agent layer is formed by applying a fluororesin, a polyvinyl chloride resin, a release varnish, or a mixture thereof onto the aluminum or copper surface of the printing plate base material by dipping or rotating. A metal made of silver or a silver-copper alloy is applied to the resin layer formed by coating or electrodeposition, or to the copper surface of the printing plate base material using the displacement plating method (a metal used to form a release layer of the gravure stamp 11i1 plate). - Tometsuki method).Furthermore, in the present invention, the thin film-like protective layer is made of a mixture of fluororesin and nickel metal. be.

(Action of the Invention) According to the present invention, a printing plate base body for an intaglio or gravure plate in which cells of a certain depth are formed and a predetermined depth for reproduction of density gradation filled in the cells is obtained. A release agent layer is interposed between the photosensitive resin so that it can be peeled off, and after printing is completed, the photosensitive resin can be easily peeled off from within the cell via the release agent layer and removed. can. In addition, since a strong protective layer in the form of a thin film is provided on the surface of the photosensitive resin inside the cells of the printing plate that has been exposed to light at a predetermined depth,
It can improve the abrasion resistance with the doctor blade in gravure printing, and by making the protective layer opaque to light, it can prevent the photodecomposition reaction of the photosensitive resin below the protective layer and reduce the brittleness of the photosensitive resin. It is possible to prevent Also,
Since the protective layer has adhesive strength to the photosensitive resin, the photosensitive resin inside the cells can be easily peeled off and removed from the cells of the plate base material via the release agent layer using the protective layer as a peeling support layer. can do.

(Example) The method of the present invention will be explained in detail according to one embodiment.

FIG. 1 is an explanatory view of the manufacturing process in the method of the present invention, in which (a) a printing plate base material having a copper metal layer on at least the surface of the printing plate base material 1 is used, and the copper metal layer of the printing plate base material 1 is used. After forming a resist pattern on the layer surface using an engraving blade using an engraving method such as an electronic engraving machine, or by applying a corrosion-resistant photosensitive resist agent onto the surface of the printing plate base material 1 and using a photographic method, an etching solution is applied. Cells 2 of a constant depth d are formed regularly in the vertical and horizontal directions in a plain mesh pattern using the etching method of etching the surface of the printing plate fogging material using -C. Cells formed using the engraving method generally have a roughly V-shaped side cross section depending on the shape of the engraving blade, while cells formed using the etching method have a side cross section that is F, tl15U-shaped. Ru.

Next, (b) a release agent layer 3 (a polar resin such as a fluororesin or a polyvinyl chloride resin, or a release varnish, or silver, Alternatively, a metal replacement plating layer or vapor deposition layer using an alloy of silver and copper is applied.

Next, (c) a positive photosensitive resin 4 is coated on the surface of the printing plate substrate 1 from above the release agent layer 3. Next (d) printing plate base vi
Excess photosensitive resin on one surface is removed using a wiping member 5 such as a squeegee. Then, if necessary, repeat the operations (c) and (2) above two to several times, and (
e) Filling the cells 2 of the printing plate base material 1 with photosensitive resin 4. Then, the photosensitive resin 4 filled in the cell is
After drying and solidifying with a C~60'C mulch, (f) a transmission type photographic original plate 6 of a desired image (for example, a negative film having a continuous tone image) is superimposed and adhered to the upper side of the printing plate substrate 1, and then heated with a xenon lamp. etc. for a specified period of 4 minutes (for example, 30 seconds to 1 hour)
80 seconds) UV light exposure. (The drawing is a schematic representation of a photographic original plate (6) in which the image temperature changes continuously from the light part (L) to the shadow part (S).) Cell 2
The inner photosensitive resin 4 is exposed to a predetermined depth corresponding to the amount of transmitted light from the lie 1 to shadow portions.

4a is the exposed part, 4b is the unexposed part, and the exposed part 4
Only a undergoes a photoreaction and becomes soluble in an alkaline solution. Subsequently, the negative film 6 is removed, and the exposed photosensitive resin 4a inside the cell 2 is developed and removed using an alkaline developer. As a result, (ch) d 1. in cell 2. d2.
Cellular image portions 7 having various depths of d 3 . . . are formed. Next, a nickel metal layer containing a fluororesin in a dispersed state is applied to the surface of the release agent layer 3 on the surface of the printing plate base material 1 and the surface of the photosensitive resin 4b formed at each scale depth in the cell 2. The printing plate is prepared by applying the protective layer 8 in the form of a uniform thin film by electroless plating.

The printing plate obtained by the method of the present invention is a printing plate formed on a plate-like or cylindrical surface. For example, as shown in FIG. 2 (a), the printing plate obtained by the method of the present invention The second intaglio cell 2 is filled with printing ink 9, the printing materials 10 are overlapped, and printing pressure is applied by the impression cylinder 11.
As shown in Figure (b), a printed image with reproduced density gradation is obtained on the surface of the printing material 10 by the ink film thickness corresponding to the depth of the cells 2.

After printing is completed, as shown in FIG. 3, by peeling off the protective layer 8 from the printing plate base material 1 via the release agent layer 3,
This is because the unexposed portion of the photosensitive resin 4b adhered to the protective layer 8 side can be peeled off from within the cell 2. The base material 1 which has been peeled off and removed from the inside of the photosensitive resin 4bi cell 2 is used again according to the process sequence shown in FIG. 1 above.

(Effect of the invention) The present invention is a printing plate used for intaglio printing and gravure printing, which has a strong protective layer on its surface and inner cell surface.
This improves abrasion resistance against gravure doctor blades, and the protective layer has a moderate affinity for printing ink that is not too strong, so excess printing ink that adheres to the plate surface can be removed using a doctor blade, etc. When scraping off, it can be scraped off more easily than before, and the transferability to the printing material is also good. Furthermore, since the protective layer has light blocking properties, it can prevent the photosensitive resin formed in the cells from reacting with external light and improve the storage stability of the printing plate. In addition, since it has a mold release agent layer under the plate surface protective layer and the photosensitive resin inside the cells, it has excellent effects such as being able to easily remove the photosensitive resin inside the cells of the plate base material. It is.

[Brief explanation of the drawing]

Figure 1 is a side view of a printing plate illustrating the steps of the method of the present invention, Figure 2 is an explanatory diagram of printing operations using the printing plate obtained by the method of the present invention, and Figure 3 is a printing plate obtained by the method of the present invention. FIG. 3 is a side sectional view showing peeling of the protective layer after printing is completed in FIG. 1...Printing plate base material 2...Cell 3...Release agent layer 4...Photosensitive resin 5...Sugi Shiro...Transmission type photographic original plate 7...Image area 8 ...Surface protective layer 9
...Printing ink 10...Printing material

Claims (1)

[Claims] 1) A step of forming intaglio cells on the surface of a printing plate base material using an engraving method and/or an etching method, and applying a release agent layer in the form of a thin film on the inner surface of the formed cells and the surface of the base material. a step of filling the cell with a positive photosensitive resin and drying and solidifying it; a step of overlaying a negative transmission photographic original plate on the substrate filled with the photosensitive resin and exposing and developing it; A method for producing an intaglio printing plate, which consists of the process of laminating a protective layer in the form of a thin film on the inner surface of the cell. 2) The manufacturing method according to claim 1, wherein the printing plate substrate surface has at least an aluminum or copper metal layer. 3) The manufacturing method according to claim 1, wherein the release agent layer is a fluororesin, a polyvinyl chloride resin, a release varnish, or a mixture thereof. 4) The manufacturing method according to claim 1, wherein the mold release agent layer is a metal layer made of silver or an alloy of silver and copper. 5) The manufacturing method according to claim 1, wherein the thin film-like protective layer is a mixture of fluororesin and nickel metal.