JPH04140101A - Manufacturing method of parquet pattern decorative board - Google Patents

Abstract

PURPOSE:To prevent black spots from developing in wooden mosaic decorative veneer by a method wherein moisture-curing adhesive added with water-adsorbed highly water absorbable fiber is used when aggregate block is formed by collecting and pressurizing humid woods, the moisture content of each of which is larger than its fiber saturation point, through the adhesive between them. CONSTITUTION:Squared timber-like woods 1, the moisture content of each of which is larger than its fiber saturation point and each of which is applied with adhesive prepared by agitating moisture-curing urethane resin adhesive added with water-absorbed highly water absorbable fiber, are collected in vertically and length-wise and, after that, pressurized so as to form aggregate block 3. At the slicing of the aggregate block 3, reinforcing thin sheets 2 are bonded through adhesive onto a pair of side faces, which are normal to the direction A of the reciprocating motion of a cutting edge, of the aggregate block 3. Further, as the highly water absorbable fiber acrylic resin fiber, which has the length of 2-10mm and the fineness of 3-40 denier and to the surface layer of which higher water absorbability is given by chemical treatment, is used.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for manufacturing a parquet pattern decorative board.

(Prior Art) The following two methods of manufacturing this type of parquet pattern decorative board are known.

M1 process of forming a collective block by bringing together and pressurizing wet wood whose whole or inside has a moisture content higher than the fiber saturation point with a moisture curing adhesive between them; The second step is to obtain a decorative veneer with a marquetry pattern by cutting it thinly in the direction of obtaining a cross-section of the mating cross section, and the third step is to attach the decorative veneer with a marquetry pattern to a substrate using an adhesive. Are known.

In addition, after soaking wet wood with a moisture content above the fiber saturation point in hot water, the wood is taken out and the top and bottom surfaces and vertical surfaces other than the end of the wood are cut with a planer or saw, and then the wood is left in the air to dry. and an M1 step in which the water content of the cut surface is made lower than the fiber iIl saturation point.

The second step is to form a collective block by aligning and pressurizing the pieces of wood with a moisture-curing adhesive between them, and cutting the aggregate block thinly in the direction to obtain a cross section of the wood pieces. A third step of obtaining a decorative veneer with a parquet pattern;
It is known to have a fourth step of attaching this parquet pattern decorative veneer to a substrate via an adhesive.

(Disadvantages of Prior Art) The two conventional methods for manufacturing parquet patterned decorative boards have the following disadvantages. That is, there was a drawback that black spots appeared on the parquet pattern decorative veneer that was thinly cut from the aggregate block.

The reason why this defect occurs is thought to be as follows.

In other words, the adhesive layer of the aggregate block usually contains water and is in a foamed state, making it brittle and easily damaged. Therefore, when cutting the aggregate block with a cutting blade, the adhesive layer is destroyed by the cutting blade, and the problem occurs at that time. It is believed that adhesive debris from the cutting blade, which contains water and contains iron, scatters onto the decorative veneer with a marquetry pattern, causing black spots.

(Objective of the Invention) The present invention attempts to overcome the above-mentioned drawbacks by strengthening the adhesive layer.

(Example) This invention will be explained below based on three embodiments.

Example 1 First step (see Fig. 1) A wet square piece of wood 1 having a moisture content above the fiber saturation point (for example, a surface moisture content of 30 to 50%) is bonded with an adhesive as shown below. Apply 170g/m2 of
When the collective block 3 is formed by putting the collective block 3 together in the length direction and pressurizing it, and at the same time cutting the collective block 3 thinly in the second step, the collective block 3 is cut perpendicularly to the direction A of the reciprocating motion of the cutting blade. A reinforcing thin plate 2 is bonded to a pair of side surfaces of the frame with an adhesive.

[Adhesive] 1 part by weight of a super absorbent fiber that has absorbed 50 times its weight of water is added to 10 parts by weight of a moisture-curing urethane shelf fat adhesive and stirred well.However, as super absorbent a#I is 2 to 10 mm long,
3 to 40 denier acrylic resin fibers are chemically treated to give the surface layer high water absorption properties 1. For example,
The product name "Lanseal FJ" [manufactured by Toyobo Co., Ltd.] is used. If the length of the superabsorbent fibers is too long, the superabsorbent fibers will become entangled excessively and become difficult to disperse uniformly in the adhesive. If it is too short, the fiber will not be able to fully demonstrate its properties of increasing the strength of the adhesive layer.
Approximately 10 mm is suitable.

2nd process (see Figure 1) The cutting blade is reciprocated in the direction of arrow A, and the set block 2
A parquet patterned decorative veneer 4 is obtained by thinly cutting. At this time, no black spots appeared on any of the marquetry pattern decorative veneers 4.

Third step: The parquet pattern decorative veneer 4 is attached to a substrate (not shown) via an adhesive such as a urea melamine resin adhesive.

Thereafter, processes such as male/female processing and painting are performed to obtain a finished product with a marquetry pattern decorative board.

Example 2 Example 2 is the same as Example 1 except for the adhesive used in the first step.

[Adhesive] 1 part by weight of a super absorbent fiber that has absorbed 30 times its weight of water is added to 100 parts by weight of a moisture-curable urethane resin adhesive and stirred well. However, the super absorbent m fiber is: 2-10mm long, 3
Acrylic resin fibers of ~40 deniers are chemically treated to impart high water absorption properties to the surface layer, for example, the trade name Lanseal FJ (manufactured by Toyobo Co., Ltd.) is used.

In Example 2 as well, no black spots appeared on any of the parquet patterned decorative veneers that were cut and formed in the second step.

Example 3 First step: A wet square piece of wood with a moisture content above the fiber saturation point is soaked in hot water at about 90°C, taken out, and the top and bottom surfaces and vertical surfaces other than the end of the wood are cut with a planer, saw, etc. Cut,
Thereafter, the wood is left to dry in the air to bring the moisture content of the cut surface below the w1 fiber saturation point.

Second step: Apply 170 g/m2 of the adhesive of Example 1 between the square timbers, align them vertically, horizontally, and lengthwise, pressurize them, and form a collective block. At the same time, when cutting the aggregate block thinly in the third step, reinforcing thin plates are bonded via adhesive to a pair of side surfaces of the aggregate block perpendicular to the direction of reciprocating motion of the cutting blade.

Third step: The cutting blade is reciprocated to thinly cut the aggregate block to obtain a decorative veneer with a marquetry pattern. At this time, no black spots appeared on any of the marquetry-patterned decorative veneers.

Fourth step: A decorative veneer with a marquetry pattern is attached to a substrate using an adhesive such as a urea melamine resin adhesive.

Thereafter, processes such as male/female processing and painting are performed to obtain a finished product with a marquetry pattern decorative board.

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

When forming the aggregate block, a moisture-curing adhesive containing water-absorbed superabsorbent fibers is used. Since the adhesive layer can be strengthened with water-absorbing fibers, it is possible to eliminate the drawback of black spots appearing on the parquet-patterned decorative veneer thinly cut from the aggregate blocks.

[Brief explanation of the drawing]

FIG. 1 is a perspective view with the middle part omitted for explaining Embodiment 1 of the present invention. 1...Wood, 2...Reinforcement thin plate, 3...Collective block 4...Parquet pattern decorative veneer patent Applicant: Eidai Sangyo Co., Ltd. Agent
Person Patent Attorney Tetsuo Onishi Figure 1

Claims (1)

[Claims] 1. Wet wood whose whole or inside has a moisture content higher than the fiber saturation point are brought together with an adhesive between them.
A first step of applying pressure to form an aggregate block, a second step of thinly cutting this aggregate block in the direction to obtain a cross-section of wood pieces to obtain a parquet pattern decorative veneer, and a second step of obtaining a parquet pattern decorative veneer. A third step of adhering to the substrate via an adhesive, and the adhesive used in the first step is a moisture-curing adhesive with super absorbent fibers that have absorbed water. A method for manufacturing a parquet patterned decorative board using. 2. After soaking wet wood with a moisture content above the fiber saturation point in hot water, take it out and cut the top and bottom surfaces and vertical surfaces other than the end with a planer or saw, and then leave the wood in the air to dry. a first step in which the moisture content of the cut surface is lower than the fiber saturation point; a second step in which the pieces of wood are brought together with an adhesive between them and pressed to form an aggregate block; The second step is to cut the block thinly in the direction that creates a cross-section of wood pieces to obtain a decorative veneer with a marquetry pattern.
and a fourth step of adhering this parquet pattern decorative veneer to a substrate via an adhesive, and the adhesive used in the second step is a super absorbent fiber that has absorbed water. A method for manufacturing a parquet patterned decorative board using a moisture-curing adhesive containing the following: