JPH0310802A - Decorative laminate - Google Patents

Abstract

PURPOSE:To manufacture a decorative laminate with a beautiful recessed and projected pattern without damaging sliced veneers by bonding respective veneers constituting of sliced veneers laminated on a base by means of a bonded layer having low bonding force and embossing a part or the whole of the bonded layer. CONSTITUTION:One wood piece 1 is bonded with the other wood piece 1 by using a bonding agent having low bonding force or slicing thinly flitchers formed by bonding said pieces by means of a bonded layer 2 having low bonding force. Said sliced veneers are placed on the surface of a base constituted of veneers, particle boards, fiber boards or the like coated with a bonding agent and pressed by a hot press with an embossing die to bond the sliced veneers and the base 3 together, and simultaneously embossing 4 is carried out. The bonding agent having low bonding force or a bonded layer 2 having low bonding force can be formed by polyaddition reaction of diisocyanate and polyol, or mixing a filler with the bonding agent, or lowering the pressure at the time of cold pressing the bonded layer flitches, or making the wood pieces constituting the flitches contain high water content or low water content or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to building materials for the interior and exterior of buildings, furniture, fittings, etc., and particularly to decorative laminates used for finishing them.

[Conventional technology and problems]

Decorative laminates are used for finishing interiors and exteriors of buildings, furniture, fittings, etc., and are required to have a high level of design. Therefore, usually, a flitch made by laminating and gluing multiple pieces of wood is sliced thinly in the direction in which the laminated pattern appears on the surface, and the veneer is overlaid on a substrate such as plywood as a decorative board. It was common to try to improve the design by using laminated patterns.

Furthermore, recently, there has been a strong demand for not only these two-dimensional designs but also three-dimensional aesthetics, and attempts have been made to apply uneven processing such as embossing to decorative boards made by overlaying veneers on substrates such as plywood. has started to be done.

However, if an embossing die is used to create an uneven pattern on plywood overlaid with a veneer as described above, the plywood overlaid with a veneer lacks flexibility, and if the embossed die is forcibly applied to the uneven pattern, the veneer becomes It had the disadvantage that it could be damaged, such as tearing, and the uneven pattern could not be created neatly.

[Problem that the invention seeks to solve]

The purpose of the present invention is to eliminate the drawbacks in the above-mentioned prior art,
To provide a decorative board on which a beautiful uneven pattern is applied without damaging the veneer, and a method for manufacturing the decorative board.

[Means of problem solving]

In the present invention, each veneer constituting a veneer laminated on a substrate is bonded by an adhesive layer with low adhesive strength, and part or all of the adhesive layer with low adhesive strength is embossed. The present invention also provides a decorative laminate characterized in that a veneer is laminated on a substrate coated with an adhesive, each veneer is joined by an adhesive layer with low adhesive strength, and the substrate of the veneer is This method of manufacturing a decorative board is characterized in that, at the same time as pressure adhesion to the veneer, part or all of the adhesive layer of the veneer with low adhesive strength is embossed.

The veneer is formed by thinly slicing a flitch made by laminating and bonding pieces of wood such as oak, teak, oak, and elm as appropriate so as to obtain a desired design in the cross section. In this case, in the present invention, the veneer is formed by thinly slicing the flitch formed by adhering the pieces of wood together using an adhesive with low adhesive strength or an adhesive layer with reduced adhesive strength. be. In this way, it is possible to obtain a veneer in which each veneer is joined by an adhesive layer with low adhesive strength.

The adhesive with low adhesive strength or the adhesive layer with reduced adhesive strength can be formed by polyaddition reaction of diisocyanate and polyol, by mixing a filler with the adhesive, or by applying pressure when cold-pressing the adhesive layer flitch. It can be obtained by reducing the moisture content of the flitch, or by making the wood chips constituting the flitch have a high moisture content or a low moisture content.

In the case of the urethane adhesive mentioned above, it is formed by a polyaddition reaction of a diisocyanate and a polyol, but in this case, if the molecular weight of the polyol is set to 400 or less, an adhesive with low adhesive strength can be obtained. Specific examples of polyols include:
Examples include polyethylene ether triol, polypropylene glycol, polyethylene glycol, and the like.

Furthermore, 100 parts by weight of the adhesive, 5 parts by weight of a solvent (ethyl acetate, methyl ethyl, ketone, etc.) and 30 to 80 parts by weight of dried and dehydrated calcium carbonate as a filler are mixed. When a filler is mixed, the adhesive force decreases, but if too much filler is added, the adhesive force becomes too weak and workability deteriorates, so the above range is desirable.

Also, when making a laminated flitch, the pressure for cold pressure is 1 to 3 kg.
/cTA (usually 4 kg/cn! or more), the adhesive strength can be lowered.

Furthermore, by setting the moisture content of the wood pieces that make up the flitch to 100% or more or 25% or less, the adhesive strength can be increased from 5 to 20%.
kg/crM. However, in this case, the adhesive used is limited to a moisture curing adhesive.

A veneer obtained by thinly slicing a flitch formed by joining each piece of wood with an adhesive layer with low adhesive strength as described above in the direction in which the adhesive layer with low adhesive strength appears on the surface in a pattern, When placed on the surface of a substrate made of plywood, particle board, fiberboard, etc. with a thickness of 3 to 20 mm and coated with adhesive, the veneer and the substrate are bonded by pressing with a hot press equipped with an embossing die. At the same time, embossing is applied. As the adhesive for bonding the veneer to the substrate, an adhesive commonly used in -a when manufacturing a decorative board may be used.

The emboss mold used has a convex part in a part or all of the pattern formed by the part of the adhesive layer with low adhesive strength in the bulge, and the convex part of the emboss mold has a convex part that corresponds to the adhesive layer of the veneer. Press so that it coincides with some or all of the parts of the adhesive layer with low strength.

[For production]

According to the embossed decorative board and the manufacturing method thereof of the present invention, when an uneven pattern is formed using an emboss mold, the veneer is bonded to the substrate by an adhesive layer with low adhesive strength. Since the emboss is applied to part or all of the layer, before the inflexible veneer cannot be stretched and breaks, the adhesive layer with low adhesive strength separates and suddenly becomes flexible, causing the emboss to Because it adapts well to uneven surfaces, it can prevent damage such as tearing of the veneer.

〔Example〕

Examples of the present invention will be described in detail below.

<Example 1> A one-component moisture-curing urethane adhesive having the composition shown below was applied to a piece of oak wood with a coating amount of 220 g/cffl), and a plurality of layers were laminated at a pressing pressure of 5 kg/C! A flitch is formed by cold pressing for 40 minutes using the cold press of a.

A veneer is manufactured by slicing the laminated flitch in the direction in which the adhesive layer with low adhesive strength appears on the surface in a pattern.

Composition: 1 mol of polyethylene triol with a molecular weight of 400 or less 1 mol of polypropylene glycol with a molecular weight of 400 or less 1.7 mol of diphenylmethane diisocyanate The urethane elastomer is coated with f and the veneer is placed on the veneer, and the urethane elastomer is coated using a hot press equipped with an embossing mold having a convex portion on a part or all of the portion of the veneer that corresponds to the area of the adhesive layer with low adhesive strength. A hot press is placed so that the convex portion is formed on the part, and hot pressing is performed at 110°C for 150 seconds.

The product completed in the above manner was able to obtain a desired decorative board in which the veneer was not damaged and the embossed part was applied with the adhesive layer having low adhesive strength separated.

<Example 2> In Example 1, the cold pressure when manufacturing the laminated flitch is 2 kg/d, and a normal one-mold moisture-curing urethane adhesive is used. The thus obtained laminated flitch was then processed in the same manner as in Example 1 to obtain a desired decorative board.

〔effect〕

As described above, the decorative board of the present invention not only has a flitch laminated pattern expressed on the surface of the veneer and has an excellent appearance, but also has an embossed finish on part or all of the laminated pattern. The three-dimensional effect is increased, and the design effect is dramatically improved both visually and tactilely.

Furthermore, the method for manufacturing a decorative laminate of the present invention involves laminating veneers in which each veneer is bonded by an adhesive layer with low adhesive strength on a substrate coated with an adhesive, and simultaneously bonding the veneer to the substrate under pressure. Since the veneer is embossed on part or all of the adhesive layer with low adhesive strength, the plywood overlaid with the veneer has poor flexibility, so when the embossed board is used to create irregularities, the veneer stretches. It tears without cutting, but before it breaks, the part of the adhesive layer with low adhesive strength separates and a flexible force is generated in the veneer, which adapts well to the unevenness of the embossed board and prevents damage such as tearing of the veneer, This method solves the problem with the conventional method that if the embossing plate is forcibly made uneven, the veneer will be damaged and the uneven pattern cannot be made neatly, and it is possible to easily create embossing that always has beautiful unevenness. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view of a flitch related to the decorative board of the present invention;
FIG. 2 is an explanatory cross-sectional view of the veneer, and FIG. 3 is an explanatory cross-sectional view of the decorative board. 1... Wood piece, 2... Adhesive layer with low adhesive strength, 3...
Substrate, 4... Embossed part.

Claims (1)

[Claims] 1. Each of the veneers constituting the veneer laminated on the substrate is joined by an adhesive layer with low adhesive strength, and part or all of the adhesive layer is embossed. , a decorative board characterized by a bonded veneer that is torn at that point. 2. Laminate veneers, each of which is bonded by an adhesive layer with low adhesive strength, on a substrate coated with adhesive, and at the same time as applying pressure to the veneer and bonding the veneer to the substrate, increase the adhesive strength of the veneer. A method for manufacturing a decorative board, which comprises embossing a part or all of a portion with a low adhesive layer.