JPS5950466B2 - Improved patterning method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of imparting a pattern to a substrate by eroding the surface of the substrate according to the pattern by sandblasting.

Metals such as aluminum, zinc, iron, etc., synthetic resins such as polymethyl methacrylate, polystyrene, polyvinyl chloride, urea-formalin resin, phenolic resin, glass, stone,
The surface of molded articles (hereinafter referred to as base materials) made of wood or the like is often etched to create patterns when these base materials are used for decorative purposes.

As a method for this, the present inventors have already placed a photocurable resin on a base material, irradiated active light through the pattern, and then
We proposed a method in which the uncured resin is removed, and then the surface of the substrate is eroded by sandblasting to create a pattern on the substrate.

This method is more effective than traditional methods such as hand engraving, chemical etching, and pasting cutouts and sandblasting.
It is extremely superior in terms of work efficiency, work environment, etc. As a result of intensive studies aimed at further improving this method, the present inventors have discovered a method that can further improve work efficiency and reduce costs, resulting in the present invention.

That is, in the present invention, a solid photocrosslinkable resin composition is placed on a base material, active light is irradiated through the pattern, and then the non-crosslinked resin is removed by sandblasting and the base material in that area is eroded. This is a method of creating a pattern on the base material. The solid photocrosslinkable resin used in the present invention must be such that the portion crosslinked by active light is more resistant to corrosion by sand blasting than the non-crosslinked portion.

That is, the crosslinked portion must be able to withstand sandblasting while the non-crosslinked portion is removed by sandblasting and the substrate in that area is then eroded. Such resins include, for example, those containing unvulcanized rubber, photopolymerizable monomers, and photosensitizers, which become rubber-like elastic bodies when irradiated with actinic rays, and those commercially available for use in flexo plates and rubber plates. Examples include photocrosslinkable resins. The procedure for applying a pattern to a base material in the present invention will be described below.

First, a 0.1 to 5 type photocrosslinkable resin layer is placed on the substrate depending on the desired depth of corrosion. The method is as follows: 0.
This is carried out by producing a photocrosslinkable resin sheet for types 1 to 5 and attaching it to a base material. In this case, use adhesive if necessary. Next, a photomask with a predetermined pattern is placed on top of this resin layer and brought into close contact with the resin layer, and actinic light is irradiated thereon. As the active light source, a high-pressure mercury lamp, an ultraviolet fluorescent lamp, a carbon arc lamp, sunlight, etc. are used. In this way, a resin layer having crosslinked portions and non-crosslinked portions (printed portions) is disposed on the base material. Next, this product is sandblasted along the image area to remove the resin in the non-crosslinked area and erode the base material in that area.

Sandblasting conditions vary depending on the type of substrate, the depth of erosion, and the thickness of the resin layer, but 30 to 500 meshes of alundum or carborundum are sandblasted at 1 to 8 kg/cm2 from a distance of 1 to 50 cm. This is done by blowing with pressurized air. In this way, a patterned base material is obtained.

The resin layer is peeled off as necessary. The feature of the present invention is that the non-crosslinked resin is removed by sandblasting, which also serves as erosion of the base material in that area.

Therefore, it is possible to significantly simplify the equipment and process and shorten the time required for patterning. The method of the present invention takes advantage of these points and can be applied to various bases. It can be widely used for patterning wood.

Next, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to the Examples.

Examples 60 parts of polychloroprene (manufactured by Showa Neoprene Co., Ltd., Showa Neoprene W), 40 parts of triethylene glycol dimethacrylate, 8 parts of Silica Powder Printing Co., Ltd., Aerosil 8300), 1 part of benzoin isobutyl ether,
0.1 part of 2,6-di-t-butyl-p=cresol was blended by roll kneading, and this was pressed to a thickness of 0.7 m.
m sheets were obtained.

Claims (1)

[Claims] 1 A solid photocrosslinkable resin composition containing an unvulcanized rubber, a photopolymerizable monomer, and a photosensitizer is placed on a base material, and after irradiating active light through the pattern, non-crosslinking is performed by sandblasting. A method of creating a pattern on a base material by removing resin and eroding the base material in that area.