JP2000015770A - Method for reusing printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for reusing a printing plate without necessity of releasing a Ballard copper plating after chrome etching, plate falling by an abrasive polisher, reforming the Ballard copper plating or the like. SOLUTION: A resin film 2 for forming a depth of a printing plate and a film 3 of a diamond-like carbon are formed on a plate base material 1 to form a plate material A. A laser beam is emitted to engrave an image 4 to form a printing plate B. After the plate is used for printing, the beam is emitted to an overall surface to simultaneously remove all the film 3 and the film 2, and the material is returned to the state of only the base material 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the reuse of a printing plate which does not require stripping of ballad copper plating after chromium etching, plate dropping by a grindstone grinder, or re-forming of ballad copper plating. About the method.

[0002]

2. Description of the Related Art There are two conventional methods for reusing gravure printing plates. One is ballad method, one is
This is a polishing plate printing method. The ballad method is a surface having releasability by plating copper on a roll of aluminum or steel plate base material to a thickness of about 100 μm, polishing the cylinder with a grindstone of about 800, coating a solution of silver oxalate, 60-80μ after processing
A ballad copper plating is formed to a thickness of about m, and the surface of the ballad copper plating is polished cylindrically with a grinding wheel of 800, 2000, and 3000 in order, and finally mirror-polished to form a plate roll. Next, a photosensitive film is coated on a plate roll, laser-exposed, developed and burned to form a resist image, immersed in an etching solution of an aqueous solution of cupric chloride, and immersed in a ballad copper plating of about 10 to 25 μm. A gravure is formed so as to have a depth, then a resist image is removed, and then chromium plating having a thickness of about 5 to 10 μm is formed in order to impart printing durability. After removing it to make a printing plate and using it for printing, chrome etching, peel off the ballad copper plating with rags and pliers and reuse it as the ballad copper plating Is performed by performing the above-mentioned surface treatment having releasability.

In the polishing plate dropping method, a printing plate is formed by a process after forming a plate roll in the state before the ballad copper plating is performed, and the printing plate is formed and used for printing. After that, the plate is polished cylindrically with a grindstone so that the plate deep part formed over the chrome plating and copper plating part is completely disappeared, and to reuse it, perform the copper plating for the shaved amount A cylindrical roll is formed by cylindrical polishing.

[0004] According to the ballad method and the polishing drop method described above,
Since copper plating is performed or removed, the running cost is high, and the equipment and management cost of a plating solution regeneration device and a drainage management device are high.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to remove ballad copper plating after chromium etching,
An object of the present invention is to provide a method of reusing a printing plate which does not require re-formation of a plate, a ballad copper plating or the like by a grindstone grinder.

[0006]

According to a first aspect of the present invention, a metal or plastic plate base material is provided with a resin film which can be burned off by a laser beam or which can be subjected to dry etching such as plasma etching. Formed thereon, a diamond-like carbon film is formed thereon to form a printing plate, and the two layers of the resin film of the printing plate material and the diamond-like carbon film are directly burned off by a laser beam to engrave an image to form a printing plate. Forming or forming a printing plate by removing the resist image by performing dry etching such as plasma etching on the resin film and diamond-like carbon film after forming a resist image on the diamond-like carbon film, After printing, the diamond-like carbon film and the resin film are plasma-etched with laser light. Returned to the state of removing all the plate base material by dry etching such as grayed, there is provided a method for recycling printing plate, characterized by a reusable printing plate base material by a surface activation treatment.

The second invention of the present application is to form a plate material by forming a resin film which can be burned out by a laser beam or a dry etching such as plasma etching on a metal or plastic plate base material. Forming a printing plate by engraving an image on the resin film portion by directly burning off the resin film of the plate material with a laser beam to form a coating film of diamond-like carbon, or forming a printing plate on the resin film of the plate material; After forming the resist image, engraving the image by dry etching such as plasma etching on the resin film, then removing the resist image, further forming a diamond-like carbon film to form a printing plate, and after using for printing, Remove all diamond-like carbon coating and resin film by dry etching such as plasma etching with laser light Returned to the state of the plate preform Te, there is provided a method for recycling printing plate, characterized by a reusable printing plate base material by a surface activation treatment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A printing plate recycling method according to a first embodiment of the present invention will be described with reference to FIG. In this method, as shown in FIGS. 1 (a) and 1 (b), a resin film 2 for securing a plate depth is formed on a roll-shaped plate base material 1, and a diamond-like carbon film is formed thereon. 3 to form a plate material A. The plate base material 1 is made of a metal, a resin that is not likely to be burned out by a laser beam, or a metal whose surface is coated with a resin that is not likely to be burned out by a laser beam, or a metal surface that is burned out by a laser beam. It is assumed that a resin coated with a resin that is not likely to be burned is further coated with a rubber that is not likely to be burned out by a laser beam. In this embodiment, the plate base material 1 has a roll shape, but the present invention includes a plate shape. The resin film 2 is a resin film such as a polyethylene resin or an epoxy resin that can be burned off by a laser beam of a carbon dioxide gas laser, a YAG laser, or a high-power pulse laser, or that can be dry-etched such as plasma etching. Select Although not particularly limited, the resin film 2 is formed to have a thickness of 10 to 15 μm.
The reason why the resin film 2 is required is that the thickness of the diamond-like carbon film 3 can be coated only in the range of 1 to 4 μm, and is to secure the plate depth (cell depth). The resin film 2 is a film 3 of diamond-like carbon.
At the same time as it is burned off by the laser beam. Therefore, a plate having a uniform plate depth (cell depth) can be formed, and a high-definition image can be obtained. In order to coat the diamond-like carbon (DLC, hydrogenated amorphous carbon) coating 3 on the resin film 2, the surface of the resin film 2 is cross-linked by irradiating the resin film 2 with ultraviolet rays or performing corona discharge. ,
After a state in which unbonded carbon atoms are uniformly deposited on the resin film 2, a treatment is performed to prevent the adhesion of impurities by exposing to a fluorine gas, and then a diamond-like carbon film is formed by a plasma CVD method or another film forming method. The coating 3 is formed. The diamond-like carbon coating 3 is formed to have a thickness of about 1 μm. Then, as shown in FIG. 1 (c), two layers of the resin film 2 of the plate material A and the film 3 of diamond-like carbon are blinked and irradiated with laser light according to image data by a laser device to directly burn out the two layers. The printing plate B is formed by engraving the image 4 composed of gravure cells.
After being used for printing, a laser device is used to irradiate the entire surface with a laser beam to simultaneously remove the diamond-like carbon coating 3 and the resin film 2 as shown in FIG. The plate base material 1 is returned to the state of only 1, and is subjected to a surface activation treatment to be a reusable plate base material 1.
Note that the diamond-like carbon coating 3 and the resin film 2 may all be removed by dry etching such as plasma etching to return to the state of the plate base material 1 alone.

Next, a second embodiment of the first invention will be described with reference to FIG. In this method, as shown in FIGS. 2 (a) and 2 (b), a resin film 2 for securing a plate depth is formed on a roll-shaped plate base material 1, and a diamond-like carbon film is formed thereon. 3 to form a plate material A. Then
As shown in FIG. 2 (c), a photosensitive film is coated on the diamond-like carbon coating 3, the image is exposed to laser light, developed and burned to form a resist image 5, and then as shown in FIG. 2 (e). As shown, dry etching such as plasma etching is performed to engrave an image 4 composed of a gravure cell in two layers of the resin film 2 and the diamond-like carbon coating 3, and then, as shown in FIG. 5
Is removed to form a printing plate B. After being used for printing, the entire surface is irradiated with a laser beam by a laser device to remove the diamond-like carbon coating 3 and the resin film 2 as shown in FIG. 2 (f). The plate base material 1 is returned to the state of only one, and is subjected to a surface activation treatment to obtain a reusable plate base material 1. When the resist image 5 is formed and plasma etching is performed, plasma is generated on the entire surface of the plate, and etching is performed on the entire surface of the plate on which the resist image 5 is not attached. Therefore, the image 4 formed of a gravure cell is engraved. The time can be reduced as compared with the case of the laser method. When the resist image 5 is formed, the resin film 2 corresponding to the portion where the resist image 5 is not attached
And the film 3 of diamond-like carbon cannot be eliminated by laser exposure. The reason is that alignment cannot be performed.

Next, a method of reusing a printing plate according to the first embodiment of the second invention will be described with reference to FIG. In this method, as shown in FIGS. 3 (a) and 3 (b), a resin film 2 for securing a plate depth is formed on a roll-shaped plate base material 1, and this is used as a plate material A. Next, as shown in FIG. 3C, a laser beam of a YAG laser device is irradiated on the resin film 2 of the plate material A to engrave an image 4 made of a gravure cell in the resin film 2 of the plate material A. As shown in FIG. 3D, a printing plate B is formed by forming a diamond-like carbon coating 3 by a plasma CVD method or the like. Then, after being used for printing, the entire surface is irradiated with laser light by a laser device to form a diamond-like carbon film 3 and a resin film 2.
Is removed, and as shown in FIG. 3 (e), the plate preform 1 is returned to a state of only the plate preform 1 and subjected to a surface activation treatment to obtain a reusable plate preform 1. Note that the diamond-like carbon coating 3 and the resin film 2 may all be removed by dry etching such as plasma etching to return to the state of the plate base material 1 alone.

A second embodiment of the present invention will be described with reference to FIG. In this method, as shown in FIGS. 4A and 4B, a metal or plastic plate preform 1 is
A plate material A is formed by forming a resin film 2 that can be burned out by laser light or dry etching such as plasma etching, and then, as shown in FIG. The resist film 5 is formed by coating the photosensitive film, exposing the image with laser, developing and burning, and then performing dry etching such as plasma etching on the resin film 2 as shown in FIG. 4E, the resist image 5 is removed as shown in FIG. 4E, and a diamond-like carbon coating 3 is formed as shown in FIG.
After being used for printing, the diamond-like carbon coating 3 and the resin film 2 are all removed by dry etching such as plasma etching using a laser beam, returned to the state of the plate base material, and re-activated by surface activation treatment. It is to be a usable plate base material.

[0012]

As described above, according to the printing plate reproducing method of the present invention, the plate deep portion is composed of the resin film and the diamond-like carbon film, and the plate image is formed by engraving with a laser. After forming a resist image or performing dry etching and using it for printing, the diamond-like carbon coating and resin film are removed by laser light or dry etching to make a reusable plate base material Therefore, unlike the conventional printing plate, the ballad copper plating is peeled off after chromium etching,
There is no need to re-form ballad copper plating or the like, so that running costs can be reduced, and equipment for a plating solution regenerating device and a drainage managing device is not required, and management costs can be reduced.

[Brief description of the drawings]

FIG. 1 shows a method of reproducing a printing plate according to a first embodiment of the first invention of the present application, wherein (a) is an entire longitudinal sectional view of a plate material,
(b) is an enlarged cross-sectional view of the main part of the plate material, (c) is an enlarged cross-sectional view of the main part of the printing plate, and (d) is an overall longitudinal cross-section of the plate base material that can be reused by removing the deep part after use. FIG.

FIGS. 2A and 2B show a printing plate reproducing method according to a second embodiment of the first invention of the present application, wherein FIG.
(b) is an enlarged cross-sectional view of a main part of the plate material, (c) is an enlarged cross-sectional view of a main part of a process of forming a resist image on the plate material, and (d) is a main part of a process of engraving an image using the resist image as a mask. FIG. 4E is an enlarged sectional view of a main part of a printing plate from which a resist image has been removed to form a printing plate, and FIG. 4F is an entire longitudinal sectional view of a plate base material in which a deep portion of the plate has been removed and reused after use.

FIGS. 3A and 3B show a printing plate reproducing method according to the first embodiment of the second invention of the present application, wherein FIG.
(b) is an enlarged cross-sectional view of the main part of the plate material, (c) is an enlarged cross-sectional view of the main part of the process of engraving an image on the plate material, and (d) is a main part of the process of coating a diamond-like carbon to form a printing plate. (E) is an overall longitudinal sectional view of a plate base material in which a deep portion is removed after use to make it reusable.

FIGS. 4A and 4B show a printing plate reproducing method according to a second embodiment of the second invention of the present application, in which FIG.
(b) is an enlarged cross-sectional view of a main part of the plate material, (c) is an enlarged cross-sectional view of a main part of a process of forming a resist image on the plate material, and (d) is a main part of a process of engraving an image using the resist image as a mask. Enlarged cross-sectional view, (e) is an enlarged cross-sectional view of a main part of a process in which a resist image is removed, (f) is an enlarged cross-sectional view of a main portion of a process in which a diamond-like carbon is coated to form a printing plate, and (g) is after use. FIG. 2 is an overall longitudinal sectional view of a plate base material in which a plate deep portion has been removed and made reusable.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Plate base material 2 ... Resin film 3 ... Diamond-like carbon film A ... Plate material 4 ... Engraved image 5 ... Resist image B ... Printing plate

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2H025 AA00 AB01 AC08 AD03 BH01 BJ00 DA14 DA40 FA10 FA41 FA47 2H084 AA05 AA30 AA40 BB01 BB04 BB16 CC03 2H114 AA03 AA14 AA15 AA27 AA28 BA01 BA10 DA03 GA04

Claims (2)

[Claims] 1. A metal or plastic plate base material,
A resin film that can be burned out by laser light or dry etching such as plasma etching is formed, and a diamond-like carbon film is formed thereon to form a plate material. The two layers of diamond-like carbon film are directly burned off by laser light to engrave the image to form a printing plate, or a resist image is formed on the diamond-like carbon film, and then the resin film and diamond-like carbon After forming a printing plate by removing the resist image by performing dry etching such as plasma etching on the coating, and using it for printing, the diamond-like carbon coating and resin film are all subjected to dry etching such as plasma etching using laser light. Remove, return to the state of the plate base material, and perform surface activation treatment Recycling method of the printing plate, characterized by a reusable printing plate base material by a. 2. A metal or plastic plate base material,
A plate material is formed by forming a resin film that can be burned off by laser light or dry etching such as plasma etching, and the resin film of the plate material is directly burned off by laser light to form an image on the resin film portion. After engraving, a diamond-like carbon film is formed to form a printing plate, or a resist image is formed on the resin film of the plate material, and then the resin film is engraved by dry etching such as plasma etching. After removing the resist image, further forming a diamond-like carbon coating to form a printing plate, and using it for printing, the diamond-like carbon coating and resin film are all removed by dry etching such as plasma etching using laser light. Plate that can be reused by returning to the state of the plate base material and performing surface activation treatment Re-use method of the printing plate, characterized in that the wood.