JPH0327901A - Manufacture of composite decorative sheet - Google Patents

Abstract

PURPOSE:To prevent simply the generation of warping by bonding a woody paper material by means of a bonding agent having good permeability and waterproofness after being cured on the rear surface side of a base, and then bonding a composite material on the rear surface side of said paper material. CONSTITUTION:A decorative veneer 2 is bonded on the surface side of a base 1, while a woody paper material 4 is bonded on the rear surface side by means of a bonding agent having good permeability and waterproofness after being cured. When said materials are dried, a warping of the base 1 generated by the shrinkage of the bonded decorative veneer 2 bonded on the surface side of the base 1 is offset by a warping generated by the shrinkage of said paper material 4 bonded on the rear surface side of the base 1. A composite material 3 is bonded on the rear surface side of said paper material 4 by means of a water-soluble emulsion bonding agent, and the permeation of the bonding agent into the rear surface side of the base 1 through the paper material 4 is prevented by the bonding agent permeated into the paper material 4 and cured therein. The rear surface side of the base 1 is expanded by said process to prevent a decorative composite sheet from warping.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention provides a method for bonding a decorative veneer to the surface side of a substrate;
It relates to a method for manufacturing a composite decorative laminate in which a composite material that imparts soundproofing properties, etc. is adhered to the back side of the substrate, and in particular, the manufactured composite decorative laminate is distributed from the center to the periphery. The present invention relates to a method for manufacturing a composite decorative board that does not cause a so-called valley warp state in which the board is warped in a bow shape.

[Prior art and its problems] Conventionally, in manufacturing decorative veneers used as flooring materials, wall materials, etc., decorative veneers are generally bonded in a wet state to the surface side of plywood that serves as a substrate. I was trying to manufacture it.

However, when a decorative veneer is glued to the front surface of plywood in a wet state, when the decorative veneer dries, it shrinks, causing the decorative veneer to shrink from the center to the periphery. A so-called valley warpage, which is a bow-shaped warpage, occurred.

For this reason, it has become very difficult to join the decorative laminates together by applying tongue processing or the like to the decorative laminates as described above.

In addition, when attaching such a decorative board directly to a concrete surface, etc., due to the valley warping of the decorative board,
The peripheral edge of this decorative board lifts up from the concrete surface, etc., and it is necessary to adhere the decorative board to the concrete surface while pressing down on the peripheral edge, making it extremely difficult to install, and even if it could be adhered, However, there was a problem in that the peripheral edge of the decorative board would peel off from the concrete surface and rise up during use.

Therefore, in order to suppress such valley warping in the decorative veneer, the present applicant has adhered the decorative veneer to the back side of the plywood in a wet state in the same way as the front side, and when it dries, In this method, the valley warping of the decorative board due to the shrinkage of the decorative veneer on the front side is offset by the warpage due to the shrinkage of the decorative veneer on the back side, thereby suppressing the above-mentioned valley warping in the decorative board.

On the other hand, in recent years, in order to impart properties such as soundproofing properties to the above-mentioned decorative laminates, composite decorative laminates have been manufactured in which a composite material that imparts soundproofing properties is adhered to the back side of the above-mentioned decorative laminates. It started to get worse.

Here, when adhering the composite material to the back side of the decorative board, generally a water-soluble emulsion adhesive is used,
This water-soluble emulsion adhesive was applied to the back side of the decorative board to adhere the composite material.

However, when a water-soluble emulsion adhesive is applied to the back surface of the decorative veneer as described above, the water-soluble emulsion adhesive penetrates into the decorative veneer bonded to the back side of the plywood, and the water-soluble Due to the moisture contained in the adhesive emulsion, the decorative veneer bonded to the back side of the plywood expanded, causing valley warping to occur again in the decorative veneer.

Then, in the state where the decorative board is warped in the valleys, the water-soluble emulsion adhesive is cured, and the composite decorative board to be manufactured becomes in the state of valley warping. A problem has arisen in that it becomes very difficult to join the boards together or to attach the composite decorative board directly to a concrete surface or the like.

For this reason, in the past, water-soluble emulsion adhesives were prevented from penetrating into the decorative veneer by applying a waterproof coating to the back side of the decorative veneer bonded to the back side of the plywood. , to prevent valley warping from occurring in the manufactured composite decorative board.

However, the work of applying waterproof coating to the back side of the decorative veneer is extremely troublesome, and there are problems in that the production efficiency of the composite decorative veneer decreases and the cost increases.

[Problems to be Solved by the Invention] This invention manufactures a composite decorative board by bonding a composite material that imparts soundproofing properties to the back side of a substrate with a decorative veneer adhered to the front side as described above. An object of the present invention is to provide a method for manufacturing a composite decorative board that can easily prevent the above-mentioned valley warping from occurring in the manufactured composite decorative board.

[Means and effects for solving the problems] In order to solve the above-mentioned problems, the present invention adheres a decorative veneer (2) to the front surface side of the substrate (1), and When manufacturing a composite decorative board by bonding a composite material (3) that imparts soundproofing properties etc. to the back side, on the back side of the substrate (1),
After bonding the wood-based paper material (4) with an adhesive that has good permeability and is waterproof after curing, this paper material (4)
The composite material (3) was adhered to the back side of the.

While the decorative veneer <2> is adhered to the front side of the substrate (1) in this way, a wood-based paper material is attached to the back side of the substrate (1) using an adhesive that has good permeability and is waterproof after curing. (
4) When these are dried,
The valley warpage of the substrate (1) due to the shrinkage of the decorative veneer <2) adhered to the front side of the substrate (1>) is caused by the
This is offset by the warpage caused by the shrinkage of the paper material (4) that has been glued in place, and the valley warp in the substrate (1) is prevented.

In addition, after bonding the wood-based paper material (4) to the back side of the substrate (1) with an adhesive that has good permeability and is waterproof after curing, the back side of this paper material (4) If the composite material (3) is bonded with a water-soluble emulsion adhesive as in the past, the water-soluble emulsion adhesive will penetrate into the back side of the substrate (1) through the paper material (4). The adhesive that has penetrated into the paper material (4) and hardened prevents the water-soluble emulsion adhesive from expanding the back side of the substrate (1) and causing valley warping in the composite decorative board.

Here, as the paper material <4> to be adhered to the back side of the substrate (1>), a wood-based material was used as described above because synthetic resin sheets etc. have poor adhesion to the substrate (1>). This is because it becomes worse.

In addition, if synthetic fibers such as rayon or vinylon are mixed into this wood-based paper material (4), the permeability of the adhesive will further improve, so paper material (4) mixed with synthetic fibers may be used. is preferable, and the amount of mixed fibers mixed in varies depending on the type of the adhesive used for adhering to the substrate (1), but generally about 20% by weight is used.

In addition, the paper material 4) generally has a thickness of 20 mm.
~50 g/m2, preferably a paper material (4) with a thickness of around 40 g/m2 so that the paper material (4) is sufficiently impregnated with the adhesive. Make it.

Furthermore, in order to more fully suppress valley warping in the composite decorative board, it is possible to overlap and adhere two or more paper materials (4) as described above.

On the other hand, the adhesive for bonding the paper material (4) to the back side of the substrate (1) should be one that has good permeability to the paper material (4) as described above and is waterproof after curing. It is particularly preferable to use a urea resin adhesive.

Moreover, the paper material (4) can be attached to the substrate (1) using such an adhesive.
) When adhering to the back side of the paper material (4), it is preferable to apply the adhesive in an amount of 100 g/m'' or more so that the paper material (4) is sufficiently impregnated with the adhesive.

[Example 1] Hereinafter, an example of the present invention will be described in detail based on the accompanying drawings.

In this embodiment, the first substrate (1) is
As shown in Figures (A) to (C), the central core plate (11) is thicker than the front plate (12) and back plate (l3) that are bonded to the front and back surfaces, and the fiber directions are alternately orthogonal. and the top plate (1
2), a core board (11), and a back board (13) are stacked together to form a 3-ply plywood (1). However, the board (1) is a 3-ply plywood (1) as shown above. The present invention is not limited to 5-ply plywood, and various other board materials can be used.

As shown in Figure (A), a thin decorative veneer (2) is adhered to the front side of the substrate (1) in a wet state, while a rayon vinylon, etc. Wood-based paper material mixed with approximately 20% by weight of synthetic fibers (4
) was bonded with a urea resin adhesive which has good permeability and is waterproof after curing.

In this way, when the decorative veneer (2) is adhered to the front side of the substrate (1) in a wet state, and the above-mentioned paper material (4) is adhered to the back side of the substrate (1), these will be removed. When it dries, the substrate (
The valley warpage in 1) was offset by the warpage due to shrinkage of the paper material (4), and no valley warpage occurred in the substrate (1>).In addition, in this example,
Although only one sheet of paper material 4) as described above is adhered to the back surface of the substrate (1), if necessary, two or more sheets of the above paper material (4) may be overlapped and adhered. It is also possible to

Next, a water-soluble emulsion adhesive is applied to the back side of the paper material (4) adhered to the back side of the substrate <1> in the same manner as in the past, and with this water-soluble emulsion adhesive, A composite material (3) that imparts soundproofing properties, etc., was adhered to the back side of the paper material (4) to produce a composite decorative board as shown in FIG. 4(C).

Here, when the water-soluble emulsion adhesive is applied to the back side of the paper material (4) as described above, the water-soluble emulsion adhesive applied to the back side of the paper material (4) is
) is impregnated into the paper material (4) and hardened to prevent it from penetrating into the back side of the substrate (1), unlike conventional water-soluble emulsion adhesives. It was found that the adhesive penetrated into the back side of the substrate (1) and expanded the back side of the substrate (1), causing valley warping in the manufactured composite decorative board.

In addition, in this example, in order to impart soundproofing properties to the composite decorative board, as shown in FIG. 1(B), a vibration damping sheet made of foam rubber ( 31),
3-ply plywood <32> with the same thickness for the top plate (32a), core plate (32b), and back plate (32c) and M-thread material (
33> are adhered to the back side of the paper material (4) in the above order, but the composite material (3) is not limited to the structure described above, and may be suitable for the purpose of the composite decorative board to be manufactured. It is possible to freely change the configuration accordingly.

[Effects of the Invention] As detailed above, in the present invention, a decorative veneer is bonded to the front side of the substrate, and a composite material that imparts soundproofing properties etc. is bonded to the back side of the substrate, thereby producing a composite decorative board. In manufacturing, a wood-based paper material is bonded to the back side of the above substrate using an adhesive that has good permeability and is waterproof after curing, and then a composite material is bonded to the back side of this paper material. As a result, the valley warpage of the board caused by the shrinkage of the decorative veneer bonded to the front side of the board is offset by the warp caused by the shrinkage of this paper material, eliminating the occurrence of valley warping on the board. By impregnating the paper material and hardening the adhesive, the adhesive for adhering the composite material is suppressed from penetrating into the back side of the substrate through the paper material, and the back side of the substrate expands, resulting in a composite decorative product manufactured. There is no longer any valley warpage in the board.

As a result, the composite decorative laminate manufactured by the method according to the present invention does not have the valley warpage unlike the conventional method, so it becomes possible to easily join the composite decorative laminates together by applying tongue processing or the like. In addition, even when the composite decorative board is attached directly to a concrete surface or the like, the peripheral edge of the composite decorative board does not lift up, making the construction extremely easy.

In addition, in the method according to the present invention, in order to suppress valley warping in composite decorative laminates, the conventional method requires troublesome work such as applying waterproof coating to the decorative veneer bonded to the back side of the substrate. It is now possible to easily manufacture composite decorative laminates without valley warpage without the need for waving, improving production efficiency and reducing production costs.

In addition, if you use the above-mentioned wood-based paper mixed with synthetic fibers to be adhered to the back side of the board, this paper material will be bonded to the back side of the board with the adhesive described above. The permeability of the adhesive into the paper material improves, allowing the adhesive to penetrate evenly into the paper material and harden, and the adhesive used to bond the composite materials as described above. Penetration into the back side of the substrate can be more reliably suppressed, and valley warping in the composite decorative board can now be even more reliably prevented.

[Brief explanation of drawings]

FIGS. 1(A) to 1(C) are process charts showing the steps of a method for manufacturing a composite decorative laminate according to an embodiment of the present invention, and FIGS.
) is a diagram showing the state in which decorative veneer and paper material are adhered to the front and back sides of plywood, and the same figure (B) is a diagram showing the state in which composite material is adhered to the back side of paper material that has been adhered to the back side of plywood. A diagram showing the state,
FIG. 2C is a diagram showing the state of the manufactured composite decorative board. Explanation of symbols (2)... Decorative veneer (4)... Paper Kyodo Veneer Co., Ltd.

Claims (1)

[Claims] 1. A decorative veneer (2) is adhered to the front side of the substrate (1), and a composite material (3) that imparts soundproofing properties etc. is adhered to the back side of the substrate (1). When manufacturing a composite decorative board, a wood-based paper material (4) is adhered to the back side of the substrate (1) using an adhesive that has good permeability and is waterproof after curing. The above composite material (3) is placed on the back side of (4).
A method for producing a composite decorative board, characterized in that the composite decorative board is bonded. 2. The method for manufacturing a composite decorative board according to claim 1, characterized in that the wood-based paper material (4) mixed with synthetic fibers is used.