JPS58104704A - Manufacture of decorative board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing decorative boards. More specifically, the present invention relates to a method for producing a decorative board in which the shading of the spring-grained portion and the summer-grained portion in the board grain pattern is bright and without the occurrence of cracks.

Conventionally, decorative boards with a grain pattern (hereinafter referred to as "grain decoration!") are produced by impregnating a black veneer with a grain pattern 1 (hereinafter referred to as "grain veneer") with a thermosetting resin. After curing, C is manufactured by heat-pressing and integrating with a base plate such as wood plywood using an adhesive, or without curing, using an adhesive as necessary. However, when producing decorative boards using this method, cracks occur on the surface of the decorative board during the heat pressing process, which tends to make the product grainy. There was a problem that the aesthetic appearance was spoiled by the striped pattern unique to veneer.

As a result of intensive studies to solve such interlayer problems, the inventors of the present invention have determined that the spring part of the veneer is fixed by pressing the grained veneer on the tuna impregnated with a thermosetting resin using a press or the like. The inventors have also discovered that rupturing the cell membrane of the summer part is effective in solving the above-mentioned interlayer problem, and have completed the present invention.

That is, in the present invention, a wooden veneer having a grain pattern is compressed to destroy cell membranes in both the spring and summer parts, and then impregnated with a thermosetting resin and causticized to obtain a resin-impregnated veneer. The present invention provides a method for manufacturing a decorative board, which is characterized in that the decorative board is integrated with a base board through an adhesive after hardening, or without a hardening process, through an adhesive as necessary.

According to the method of the present invention, it is possible to produce a grained decorative board in which the shading of the spring-grained portion and the summer-grained portion in the striped pattern is clear and the surface has a crack-free surface.

There is no particular restriction on the type of grained veneer used in the present invention, and examples thereof include pine, toga, cedar, and cypress. Similarly, there is no particular restriction on the base plate, and examples thereof include essential plywood 9 asbestos calcium silicate plate, m plate, etc.

The thermosetting resin used in the present invention is unsaturated polyester,
Examples include epoxy diacrylate resin, diallyl phthalate resin, epoxy resin, etc., and if necessary, one of these resins may be used.
A reactive diluent, a flexibility imparting agent, a softening agent, a curing accelerator, a tJI surfactant, etc. can be added to -.

The adhesive is not particularly limited as long as it does not adversely affect the curing of the thermosetting resin, and may be polyol/isocyanate-based or phenoxim-based.

Epoxy resin-based, epoxy acrylate-based, rubber latex-based natural resin-based, polyacetate vinyl-based emulsion seals,
Examples of adhesives include ethylene-vinyl acetate emulsion adhesives and epoxy resin emulsion adhesives. Further examples include hot-melt adhesives such as rosin/polyamide adhesives and ethylene-vinyl acetate sheet adhesives.

In the method of the present invention, the method of pressing the grained veneer to destroy cell membranes in the spring and summer areas generally includes a method using a roll or a press. When using rolls, the pressure of pressing can be adjusted by adjusting the gap between the rolls, and when using a regular board-veneer with a thickness of 0.8 to 1.6M, the gap between the rolls can be adjusted by adjusting the gap between the rolls and the thickness of the veneer. It is desirable to adjust the pressure so that the amount is O8l to 0.2WIl less than the actual amount. Further, when using a press, the pressure is usually at least 10 su/d.

The pressed grained veneer is then impregnated with a hardening resin. The method of impregnating the resin with ink is not particularly restricted, and may be carried out by conventionally known methods under normal pressure, reduced pressure, increased pressure, or a combination thereof.

The resin-impregnated veneer can then be integrated by bonding it to the base plate using an adhesive after the impregnated resin is cured, or alternatively, it is necessary to leave the impregnated resin as is without curing it. The tree layer-impregnated veneer and the base plate are integrated by stacking them on the base plate, and then hot-pressing and crimping them under conventionally known conditions.

In this way, a decorative board with a crack-free surface with clear shading between the spring 1lII and the summer part is manufactured.In order to further improve the appearance of the surface, k is coated with a top coat, etc. The processing of - may also be performed.

The method of the present invention will be explained below using practical examples.

Note that parts and % in one example represent parts by weight and % by weight, respectively.

Example 1 Sow up? -8111W (manufactured by Sanyaku Kakosha).

1.5 parts of benzoyl peroxide was added as a curing catalyst to 100 parts of unsaturated polyester resin varnish for WPC, and the mixture was thoroughly mixed to form a wood arm. Next, barrel grain veneer (◎
, Bgm thickness) were passed through a roll gap of 0.7 jl and pressed together, and then immersed in the resin solution described above for 1 hour under reduced pressure of 8 to 29 mHg. This resin-impregnated veneer is coated with Sumikaflex 400 (ethylene-vinyl acetate emulsion carbon, manufactured by Sumitomo Chemical Co., Ltd.) at a ratio of 156 PS! The leaves were stacked on the coated lauan plywood and heat pressed at 120' CJ 5 Ky/d.

The barrel-grain decorative plywood thus obtained had no cracks on its surface and exhibited a grain pattern with clear shading.

Comparative Example 1 A decorative plywood was produced in the same manner as in Example 1 except that the barrel grain veneer was not rolled. On the surface of the decorative plywood thus obtained, racks suddenly appeared, and the shading on the surface was also uneven.

Example 2 Su(UP IVI-111 (Sanken Kako Co., Ltd. product, Epoxy acrylate resin) 6G11. Davon tot (Diallyl phthalate resin, Sumitomo Chemical Co., Ltd. product) 10 parts, diallyl phthalate 10 parts.

Dioctyl phthalate 201E, benzoyl peroxide guide L, and S ml were thoroughly mixed to prepare a resin liquid. Next, a cedar veneer (0.4 layer thickness) was cold pressed at 60 s/d for 10 minutes, and then immersed in the resin solution for 1 hour under reduced pressure of 8 to 20 wsHg. The thus obtained resin liquid-impregnated veneer was superimposed on lauan plywood whose surface was coated with SumiPly 11 (plywood adhesive, manufactured by Sumitomo Chemical Co., Ltd.) at a rate of 160 t/l/. Tsuru pressing was carried out under the conditions of i to /d.

The decorative plywood between the cedar boards thus obtained had no cracks on the surface and exhibited a clear grain pattern as shown in **1. Comparative Example 2 Except that the cedar board veneer was not press-treated. A decorative plywood was prepared in exactly the same manner as in Example 2. The surface -ζ of the decorative plywood thus obtained had a large roughness and a rack, and the shading of the surface was also unclear.

Practical Example 8 1.5 parts of benzoyl peroxide was added to the Sumiup P-atsw too part and heated to form a resin liquid. .8
After passing through W and pressing and tightening, immerse in the above resin liquid, 8. ~
Impregnation was carried out for 1 hour under a reduced pressure of 20 wtHg. The resin-impregnated veneer thus obtained was hot pressed at 120°C and 6 m/d. ξ Sumikada the obtained grain veneer on the surface,
In 1500 (room-temperature curing epoxy resin adhesive, manufactured by Sumitomo Chemical Co., Ltd.) was layered and adhered onto the self-weighted lauan plywood at a rate of 150'' f/d. The barrel-grain decorative plywood obtained in this manner had no cracks on the surface and had a #beak color with summer and spring grain shading.

Further, the thus obtained decorative plywood was subjected to heat treatment at 80 DEG C. for 80 minutes and at -20 DEG C. for 80 minutes, but no cracks were generated on the surface.

Comparative Example 3 Decorative plywood was produced in exactly the same manner as in the actual example except that 01-ru treatment was not carried out.

Although no cracks occurred on the surface of the obtained decorative plywood, the light and shade of Natsume's first shade was unclear and the appearance was poor, and furthermore, when heat shock was applied in the same manner as in Example $, cracks occurred on the surface. It was inferior in commercial value.

Claims (1)

[Claims] A wooden veneer with a grain pattern is pressed to destroy both the spring and summer grain parts, and then impregnated with a thermosetting resin to obtain a resin-impregnated veneer, which is cured with IIk1m resin. A method for manufacturing a decorative laminate, which is characterized in that the decorative laminate is integrated with a base plate through an adhesive or a curing process (if necessary, the laminate is integrated with a base plate through an adhesive, if necessary).