JPS60210403A - 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 [Technical Field] The present invention relates to a method for manufacturing a decorative board in which a veneer of artificial precious wood is adhered to the surface of a substrate.

[Background technology]

Conventionally, artificial precious wood decorative boards are made by bleaching the raw material veneer, dyeing the resulting bleached veneer by soaking it in a dye solution, laminating and adhesively molding the dyed veneer to create flitches, and slicing the flitches. By doing this, an artificial precious wood veneer was obtained, and this artificial precious wood veneer was attached to the surface of a substrate such as plywood.

This conventional method had the following problems: ■ When the raw material veneer was destained, the strength of the raw material veneer deteriorated by more than 30% due to the effects of the chemicals and treatment temperature, and when slicing the flitch, the artificial precious wood veneer was damaged. Yield of good products decreases.

■ In decolorization using the immersion method, hydrogen peroxide, the main agent, reacts with the alkali activator and the eluted portion of the veneer material and self-decomposes, resulting in a large loss of chemicals.

■ In dyeing by dipping, the adsorption of dye changes depending on the part of the material, resulting in differences in the amount of dye adsorption, which causes local variations in the degree of dyeing.

■ In destaining by immersion, extracted components in the wood are eluted into a large amount of solution, and dyes are selectively adsorbed, making it difficult to reuse the solution and generating a large amount of waste liquid.

[Purpose of the invention]

In view of the above-mentioned conventional situation, this invention aims to improve the yield of artificial precious wood veneers, prevent self-decomposition loss of hydrogen peroxide, reduce variation in the amount of dye adsorption, reduce the amount of waste liquid, and reduce manufacturing costs. The purpose is to

[Disclosure of the invention]

In order to achieve the above object, this invention applies a decolorizing liquid to the material wood grain veneer after adhering the material wood grain veneer to the substrate in order to obtain a decorative board in which an artificial precious wood veneer is pasted on the surface of the substrate. The gist of this paper is a method for manufacturing decorative laminates, which is characterized by bleaching the veneer, applying a dyeing solution to it, and making it into a veneer of artificial precious wood. This will be explained in detail below.

The material veneer is obtained by slicing raw wood into 0.2-2.0 mm thick pieces. Unlike conventional methods, this is immediately laminated and adhesive molded to form a flitch. When you slice this flitch,
A material veneer having wood grains, that is, a material wood grain veneer is obtained. This wood grain veneer is pasted onto the surface of a substrate such as plywood.

Then, a decoloring liquid such as an aqueous H2O2 solution is applied to the wood grain veneer on the surface to decolorize it. It is preferable to apply and cure an alkaline aqueous solution prior to applying an aqueous H2O2 solution or the like, since this improves the decolorizing efficiency and decolorizing property. A dyeing liquid is applied to the bleached wood grain veneer of the thus obtained bleached wood grain veneer laminated substrate to dye it. In this way, you can obtain the desired decorative wood veneer made of carpenter's wood.

As seen above, in this invention, the material wood grain veneer obtained by slicing a flitch made of a material veneer that has not been destained is attached to a substrate (plywood) that serves as a strength support, and then the material is destained. I try to do this. Therefore, veneer loss can be reduced to about one-third compared to conventional methods. The main agent hydrogen peroxide and the activator alkali that make up the decolorizing solution of the dipping method are separated, the concentration is increased to about 122 times, and the alkali and hydrogen peroxide are applied to the surface of the wood-grained veneer board in two stages. I try to apply it. Therefore, drug loss can be reduced to about one-third. The concentration of the dyeing solution was adjusted to 6 by the dipping method.
I raise the temperature by about twice as much and apply it to the surface of the bleached wood grain veneer board. Therefore, the variation in the degree of staining can be reduced by about 30%. In the conventional dipping method, the concentration of the treatment liquid is low and cannot be reused, but in this invention, as seen above, the high concentration liquid is applied for de-staining, so the amount of waste liquid is reduced by about 30 minutes. It can be reduced to just 1.

A detailed explanation will be given below using examples.

[Example 1] Agathis veneer with a thickness of 1.0 cm is dried to a moisture content of 15 to 30% (based on weight, the same applies hereinafter), coated with moisture-curing urethane adhesive, and stacked between uneven wooden molds. A flitch was obtained by bonding under pressure.

The thickness of the veneer obtained by slicing this flitch is 2.5.
mm plywood with urea/vinyl acetate adhesive, decolorize the surface by applying 4% caustic soda aqueous solution and 35% hydrogen peroxide aqueous solution in two steps at 100 g/nf each, and then 100g/n of 0.6% colored acid dye solution. After applying and curing, a cedar-patterned carpentry decorative board was obtained.

[Example 2] Labra rotary veneer with a thickness of 0.8 mm was prepared with a moisture content of 5 to 1.
It was dried to 5%, coated with a urea/vinyl acetate adhesive, loaded in a flat plate press, and bonded under pressure to obtain a flitch.

The thickness of the straight-grained veneer obtained by slicing this flitch is 5.
After pasting it on a 5mm thick particle board with acrylic adhesive, apply 200 g/rrr of 10% hydrosulfide aqueous solution to the surface to decolor it, then apply 100 g/rrr of teak-colored alloy complex dye solution to make it teak. I got an artificial precious wood decorative board with a handle.

〔Effect of the invention〕

The method for manufacturing decorative laminates according to the present invention involves slicing a flitch produced by laminated adhesive molding without de-dying the material veneer, and then attaching the material veneer to a substrate (plywood). De-staining is performed using a coating method, and the decorative board is made from a veneer of carpenter's precious wood, resulting in a significant reduction in process loss9.
This makes it possible to improve yields and thereby reduce manufacturing costs.

Agent: Patent Attorney Takehiko Matsumoto

Claims (1)

[Claims] (11. To obtain a decorative board with a carpenter's precious wood veneer adhered to the surface of the board, the material wood grain veneer is pasted on the board, and then a bleaching solution is applied to the material wood grain veneer to bleach it, and then a dyeing solution is applied to it. A method for manufacturing decorative laminates, which is characterized by coating and creating a veneer of artificial precious wood.