JPS62275771A - Manufacture of decorative board having fine uneven pattern - Google Patents

Abstract

PURPOSE:To enable even the fine part of an uneven pattern to be reproduced at low cost by photographing a shading of unevenness, preparing a screen printing plate with the exposed film and forming an uneven pattern which a synthetic resin ink on a planar base material using said screen printing plate. CONSTITUTION:A phase base materials having fine uneven patterns such as various grains, conduit pipe, rift, and texture are used as a matrix material and then a shading on the surface of said matrix material is photographed for transfer to a film. With a film exposed in this way, the shading on the surface of the matrix material is reproduced on a screen printing plate. Next, using said screen printing plate, the surface of the plannar base material such as polywood, particle board, MDF (medium-density fiber board), hard board, gypsum board, calcium silicate board and asbestos slate is subjected to substrate coating treatment, if necessary. After this, an uneven pattern is formed in synthetic resin ink by means of the screen printing plate, then is cured. The count of a yarn used on the screen printing plate should preferably be #50-#150, and the thickness of a regist film 100-300mum.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method of manufacturing a decorative board having a delicate uneven pattern.

[Prior Art] A conventional method for manufacturing a decorative board having an uneven pattern is a method in which an embossed board that matches the pattern is used and an uneven pattern is directly formed on the surface of the decorative board using a flat plate press (Japanese Patent Publication No. 40-2).
7014), a method of directly forming irregularities on the surface of a decorative board using an embossing roll (Japanese Patent Publication No. 47-18559)
(Japanese Patent Publication No. 47-32694), etc.

There is also a method of creating an embossed pattern on the surface by creating a difference in the curing speed of the resin applied to the surface of the decorative board and utilizing the difference (Japanese Patent Publication No. 46-36479, Japanese Patent Publication No. 47-715).
Publication No. 3).

[Problems to be solved by the invention] In the method of forming an uneven pattern using the embossing plate and embossing roll described above, the pressing force must be increased in order to obtain a delicate uneven pattern; If the height is too high, the plate-like base material may be crushed, so it was not possible to increase the height too much, and the user had to compromise with an uneven pattern that sacrificed the fineness of the surface. Furthermore, it is difficult to form an uneven pattern on a hard plate-like base material such as an inorganic plate.

Furthermore, the embossing board and the embossing roll are expensive, and it is difficult to register the design of the decorative board with the uneven pattern of the embossing board and the embossing roll, which takes time to manufacture, and the decorative board becomes expensive.

On the other hand, the method of forming a concavo-convex pattern by varying the curing speed of the resin has drawbacks such as being uneconomical due to the large number of man-hours and unstable reproducibility of pattern formation.

Measures for Solving Problems c] The present invention uses a plate-like material having delicate uneven patterns such as various wood grains, conduit patterns, stone grain patterns, cloth grain patterns, etc. as a base material, and improves the shading on the surface of the base material. The first step is to transfer the image onto a film by photographing, the second step is to use this film to reproduce the shadow on the surface of the base material on a screen printing plate, and the second step is to use the screen printing plate to print plywood, particle board, etc. MDF (
After applying a surface treatment as necessary to the surface of a plate-shaped substrate such as medium-density fiberboard, hardboard, gypsum board, calcium silicate board, asbestos slate board, etc., use the screen printing plate to print synthetic resin. It consists of a third step of forming an uneven pattern with ink and curing it, and a top coat is applied if necessary.

In the process of transferring the shading on the surface of the base material onto a film, the shading is usually transferred onto a negative film, the negative film is transferred to a positive film, and this positive film is used to reproduce the shading on a screen printing plate. However, it is also possible to use a negative film or one directly transferred to a positive film.

In order to form a thick film with a delicate uneven pattern on the surface of a plate-shaped substrate by the method of the present invention, the gauze of the screen printing plate used is preferably #50 to #150, and the resist film thickness is preferably in the range of 100 to 300 μm.

A screen printing plate is prepared by a general method such as coating a screen gauze with a photosensitive resin and emitting light through the film to remove uncured portions.

Next, as synthetic resin inks, vinyl acetate, acrylic,
Epoxy resins or aqueous emulsion types made of these copolymer resins, solvent-type or non-solvent types of unsaturated polyesters, epoxy, urethane, acrylic, amino alkyd resins, acrylics, urethane acrylates, epoxy acrylates, and non-solvent types. An ultraviolet curing type of saturated polyester is used. In order to form delicate uneven patterns, these synthetic resin inks have a solid content of 6.
0% or more, a viscosity of 5,000 to 20,000 centivoise, and a thixotropic property.

Furthermore, transparent extender pigments such as talc are added to the synthetic resin ink.
! It can be added in an amount of 100 to 20 parts by weight. In particular, a synthetic resin ink containing 1 to 10 parts by weight of a pearl pigment can express the texture of natural wood and the luster of natural stone.

[Examples] Example 1 A decorative board made of oak veneer veneer parquet was exposed to oblique light, and the uneven pattern of the conduit holes and the joints of the veneers was photographed on a negative film. This negative film was transferred to a positive film, and a screen printing plate was prepared using this positive film using #110 Tetron gauze. The resist film thickness of the screen printing plate was finished to 200μ.

Next, after pasting 30 g/m2 resin-impregnated paper on plywood with a thickness of 4 mm, 5 parts by weight of Burl pigment was added to 100 parts by weight of ink, and the viscosity was 15. A concavo-convex pattern was formed using the above-mentioned screen printing plate with an acrylic emulsion type ink (solid content 70%) having 00 centivoise and thixotropic properties, and was dried with hot air. The resin film thickness is 120
It was μ.

Next, black acrylic urethane paint was applied to the surface, and when it dried, a decorative board was obtained that clearly reproduced the delicate irregularities such as the conduit holes of the base material.

Example 2 A screen printing plate was prepared in the same manner as in Example 1.

Next, 10 g/m2 of nitrocellulose gravure ink containing MEKPO (methyl ethyl ketone peroxide) was applied to 30 g/m2 resin-impregnated paper using a gravure printing machine, dried, and adhered to the surface of a 4 mm thick plywood board. A screen ink (solid content 10 parts by weight) made of an unsaturated polyester resin with a viscosity of 15,000 centibois to which 100 parts by weight of talc as an extender pigment and a small amount of cobalt naphthenate as a catalyst were added to 100 parts by weight of the ink was applied to the surface of the screen ink.
0%) using the screen printing plate, and dried with hot air.

Delicate irregularities such as conduit holes in the base material are clearly reproduced, and since the ink used is 100% solids, the film thickness is 180 μm.
The result is a thick decorative board with a rich three-dimensional effect.

Example 3 The shadow of the conduit hole of a natural oak tree was photographed on a negative film. This negative film was transferred to a positive film, and this positive film was used to prepare a screen printing plate using #80 Lugist Tetron gauze having a film thickness of 200 μm.

Next, 12mm thick MDF (Starwood Kitashin Co., Ltd.)
An acrylic ultraviolet curing ink with a viscosity of 15,000 centivoise and thixotropic properties is applied to the surface of the
Lusen Dainippon Paint Co., Ltd.? A concavo-convex pattern was formed on the screen printing plate using a silica gel, and the plate was cured by irradiating it with an ultraviolet lamp (output 80 W/am) for 3 seconds.

Next, a black-brown acrylic paint was applied only to the conduit holes formed as recesses, and the convex parts were polished and a brown-brown acrylic urethane paint was applied to form a top coat.

A decorative board with a film thickness of 180 μm and excellent three-dimensional effect was obtained, which clearly reproduced the conduit holes.

Example 4 Oblique light was applied to the surface of a plate-shaped object made of granite to clarify shadows and shadows, a photograph was taken on a negative film, and this negative film was transferred to a positive film. Using this positive film, a screen printing plate was prepared using #120 Tetron gauze with a resist film thickness of 130 μm.

Next, 50 g/m2 of white urethane sealer was applied to the surface of the asbestos slate board, and the surface on the machine, which had been primed, was
This is an ultraviolet curing ink with a viscosity of 13,000 centivoise and thixotropic properties, in which 5 parts by weight of pearl pigment is added to 100 parts by weight of the ink. (Output 8
0 W/cm) for 3 seconds to cure.

Next, a translucent, light blue acrylic urethane paint was spray applied to this surface and allowed to dry.

We obtained a decorative board that reproduces the delicate uneven pattern of granite.

[Effects of the Invention] The present invention involves photographing the shadows of unevenness such as natural wood grain, conduit pattern, fabric pattern, stone pattern, etc., using this film to produce a screen printing plate, and using this screen printing plate. Since the uneven pattern is formed on the plate-shaped base material using synthetic resin ink, even the delicate parts of the uneven pattern can be reproduced.

In particular, when using ultraviolet curable ink, the ink can be cured by ultraviolet irradiation in a very short period of time, which is efficient and reduces production costs.

Moreover, since no pressure is applied when forming the uneven pattern, it can be used regardless of whether the plate-shaped base material is soft or hard.

Claims (1)

[Claims] 1. A first step of transferring the shadow of the surface of the base material having a delicate uneven pattern onto a film by photographing, and using this film to reproduce the shadow of the surface of the base material on a screen printing plate. and a third step of forming an uneven pattern with synthetic resin ink on the surface of a plate-shaped base material using the screen printing plate and curing it. manufacturing method. 2. The method for manufacturing a decorative board according to claim 1, wherein the synthetic resin ink is an ultraviolet curable ink.