JPS61100487A - Printing method - Google Patents

Abstract

PURPOSE:To enable solid printing, improve durability of a photosensitive resin printing plate and reduce printing cost, by a method wherein a pressure of a doctor blade for scraping off an ink on an intaglio is borne by a metallic base surface at the periphery of a recessed part. CONSTITUTION:A flat recessed part 2 with uniform depth is provided in the surface of a base plate 1, a liquid photosensitive resin 3 is poured into the recessed part 2, a surplus of the resin protruding above the surface of the plate 1 is scraped off, and a flat resin layer is thereby provided. The surface of a resin intaglio is set to be lower than the surface of the base plate. A positive film of a design to be etched is placed on the resin layer, the resin is exposed to light imagewise, the resin at unexposed parts is washed away by water spray or waster brushing to develop the image, and water left on the intaglio surface is removed. When performing solid printing by the intaglio, a doctor blade is moved on the resin intaglio to scrape off the ink. The pressure of the blade is borne by the surface of the base plate at the periphery of the recessed part and is prevented from acting directly on the resin intaglio, so that the intaglio is not damaged by the blade. Accordingly, durability is improved, and printing cost can be markedly reduced.

Description

[Detailed Description of the Invention] (Background of the Invention) In conventional intaglio printing, printing is performed using etched steel plates, etc., which is expensive and unprofitable for small-volume printing. It has been proposed that a photosensitive resin layer be placed on a base and printed.

However, when using a photosensitive resin layer in intaglio printing, there is a step of scraping off the ink on the surface with a doctor blade, so the manufacturing cost is lower compared to hard plate materials such as steel plates. , the durability (printing durability) of the photosensitive resin layer is extremely poor.

Furthermore, due to the limited hardness of the photosensitive resin layer, it could not support the pressure of the doctor blade, making thick designs and solid printing impossible.

(Object of the Invention) The present invention has been made in view of the above matters, and eliminates the above-mentioned drawbacks of the conventional technology, and (1) enables solid printing;
(2) The durability of the photosensitive resin layer is greatly improved, and (3) the printing cost is lower than that of the conventional photosensitive resin layer method.

(Summary of the Invention) The gist of the present invention is to form a planar recess with a predetermined depth and shape on the surface of a metal base, and to tightly fit a pre-designed resin intaglio into the recess, or to apply a liquid photosensitive material to the surface of the metal base. A photosensitive resin layer is formed by pouring resin or closely adhering a sheet-like photosensitive resin film, which is exposed to light to form an intaglio plate having desired printed characters, etc., and a doctor blade is reciprocated over the intaglio plate. A pad and gravure printing method in which damage to a resin intaglio plate by the doctor blade is prevented by supporting the pressing force of the doctor blade mainly on the surface of the metal base around the recess when scraping off ink. .

(Embodiments of the Invention) The present invention will be described in detail below with reference to the accompanying drawings.

First, the plate-making process is as follows.

The intaglio plate used in the present invention can be created by simply bringing a separately prepared resin intaglio plate into close contact with the flat recesses formed on the surface of the base plate, but it can also be created by the following method.

Using an appropriate material 1, for example, a base plate 1 made of the same material as a conventionally used steel plate, a planar recess 2 (Fig. 1) with a uniform depth is formed on its surface by etching, etc., and a liquid photosensitive layer is applied to this. Alternatively, instead of pouring photosensitive resin 3, scrape off the excess resin protruding from the surface of the base plate with a doctor blade or the like to form a flat resin layer, or instead of pouring liquid photosensitive resin, create a sheet covered with a protective film. After the photosensitive resin film 4 is brought into close contact with the bottom surface of the recess using a pressing roller or the like, the protective film 4 is peeled off (see FIG. 2).

As the resin used in the resin intaglio of the present invention, resins conventionally used in letterpress or stencil printing can be used. For example, Nrubika (
Product name: Daicel Chemical Industries, Ltd.).

As mentioned above, after confirming that there are no air bubbles or dust between the photosensitive resin layer formed in the planar recess of the base plate and the bottom surface of the base plate recess, etching (exposure, development, etc.) of the photosensitive resin layer is performed. to create a resin intaglio. (See Figures 3 and 4) The roughness of the flat recess formed on the surface of the base plate depends on the thickness of the resin plate formed in the recess, and the surface of the resin intaglio is located below the surface of the base plate. The depth should be as follows.

During exposure, a positive film with the design to be etched is placed on the photosensitive resin layer and exposed.

Exposure time varies depending on the light source, but for chemical lamps it is 30
Second to 3 minutes is sufficient. Next, the resin in the unexposed areas is washed off with water spray or water brushing and developed. Remove moisture from the surface of the developed plate.

Further, if necessary, re-expose (5 to 5 minutes) until the remaining exposed portion of the design reaches the desired hardness.

Furthermore, a curing agent may be used.

Although the above explanation has been made using a lithographic plate for bat printing as an example, cylinder plates (for gravure and offset printing) can also be created in the same way.

(Effect of the invention) When printing using the above-mentioned intaglio plate, the doctor blade is moved onto the resin intaglio plate formed in the recessed part of the base plate to scrape off the ink.The pressing force of the doctor blade is mainly The resin intaglio plate is supported on the surface of the base plate around the recess, and the pressing force of the doctor blade does not directly act on the resin intaglio plate, so that it is not damaged by the doctor blade.

It is also possible to apply the method of the present invention to only a part of a conventional steel plate and print the other parts as usual. , parts of characters that are rarely rearranged can be printed using the conventional steel plate method.

In addition, the photosensitive resin intaglio used in the present invention can reduce the cost by about 170% compared to conventional photosensitive resin intaglio.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a liquid resin coating step in the present invention. FIG. 2 is a diagram showing the process of forming a resin layer using a sheet-like resin film in the present invention. FIG. 3 is a diagram showing the exposure process in the present invention. FIG. 4 is a diagram showing the re-exposure step in the present invention. 1... Base plate 2... Planar recessed part 3...
Liquid photosensitive resin 4... Sheet photosensitive resin film 4-1... Protective film 4-2... Positive film Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] A resin intaglio plate is brought into close contact with a flat recess formed on the surface of a base plate, and a doctor blade is mainly supported on the surface of the base, and the ink is scraped off by reciprocating the resin intaglio plate. pad and gravure printing method.