JPH03219909A - Manufacture of wooden mosaic decorative sheet - Google Patents

Abstract

PURPOSE:To strongly join aggregated block by a method wherein woods are air-dried so as to bring the moisture content on their whole surfaces below their fiber saturation points and collected and pressurized through moisture- curing urethane-based adhesive among them so as to produce the aggregated block. CONSTITUTION:Woods are air-dried so as to bring the moisture content on their whole surfaces below their fiber saturation points. The resultant woods are collected and pressurized through moisture-curing urethane resin adhesive among them so as to produce aggregated block. The preferable size of particles in the moisture-curing urethane resin adhesive is 50 - 300 mesh being absorbed with water and swollen. By slicing up the aggregated block in the direction so as to obtain wooden mosaicked cross-section, wooden mosaic decorative veneer is obtained. The resultant veneer is pasted through adhesive such as urea-melamine resin-based adhesive or the like to base.

Description

[Detailed description of the invention] (Industrial application field) Ru.

(Background of the Invention) The present applicant has discovered that when the moisture content of the surface of wood is lowered slightly below the fiber saturation point, and then the wood is bonded using a moisture-curing urethane adhesive, the surface becomes smoother without drying. It has been discovered that the adhesive strength can be significantly increased compared to when bonding wet wood with very high moisture content. When two pieces of wet wood with a very high moisture content are glued together, the moisture on the surface will drastically reduce the concentration of the moisture-curing urethane adhesive. It is thought that the reason why it is slightly lowered is because such a thing does not occur.

This invention applies the above discovery to a method for manufacturing a parquet-patterned decorative board.

(Example) The present invention will be explained below based on examples.

This invention involves soaking a large number of moist prismatic pieces of wood having a moisture content above the fiber saturation point in hot water at about 90°C, taking them out, and removing the ends of the wood. The surface to be removed is cut with a planer, saw, etc. and cut into a predetermined length, and then the wood is left to dry in the air to bring the moisture content of the entire surface of the wood below the i-fiber saturation point.

Second step: The wood pieces are brought together and pressed together with the following adhesive interposed between them to form a collective block.

Adhesive Example 1 100 parts by weight of a moisture-curing urethane resin adhesive was mixed with a powder of a highly water-absorbing polymer compound (
Adhesion by adding 2 parts by weight (in the water-absorbed state) of product name "Aqualink" [manufactured by Shiraki Shokubai Kagaku Kogyo Co., Ltd., with an average particle size of 100 mesh before water absorption] and stirring well. Agent Example 2 100 parts by weight of moisture-curable urethane resin adhesive
2 parts by weight of a powder of a highly water-absorbing polymer compound that has absorbed twice its weight of water (trade name "Sunwet" [manufactured by Sanyo Chemical Industries, Ltd., with an average particle size of 80 mesh before water absorption]) (
(in a state where water has been absorbed) is added and stirred well.If the particle size of the superabsorbent polymer compound powder is too fine, the pot life will be shortened, and on the other hand, if it is too coarse, it will become moisture-curable. Since the distribution density of the powder particles in the urethane resin adhesive becomes coarse and uniform adhesion cannot be obtained, the particle size of the powder particles should be 50 to 30% before being swollen by water absorption.
00 mesh is preferred.

Third step: This assembled block is cut into thin pieces in the direction in which a cross-section of the lumber is assembled to obtain a decorative veneer with a marquetry pattern.

Fourth step: This parquet pattern decorative veneer is adhered to a substrate using an adhesive such as a urea melamine resin adhesive.

(Effects of the Invention) The present invention achieves the following effects through the above-described configuration.

After leaving the wood to dry in the air to bring the moisture content of its entire surface below the fiber saturation point, the pieces of wood are assembled and pressed together with a moisture-curing urethane adhesive between them to form an assembled block. , the aggregate blocks can be firmly bonded together, and as a result, a decorative panel with a parquet pattern with a durable surface can be obtained.

Claims (1)

[Claims] 1. After soaking a large number of wet pieces of wood with a moisture content higher than the fiber saturation point in hot water, take them out, cut the surface excluding the end of the wood with a planer or saw, and cut them to a predetermined length. The first step is to dry the wood by leaving it in the air so that the moisture content on its entire surface is below the fiber saturation point, and then the wood is brought together with a moisture-curing urethane adhesive between them and pressure is applied. The second
A third step is to thinly cut this assembled block in the direction of obtaining a cross-section of the wood pieces to obtain a decorative veneer with a parquet pattern.The third step is to attach this decorative veneer with a parquet pattern to a substrate using an adhesive. A method for manufacturing a parquet pattern decorative board, comprising a fourth step.