JP2001150597A - Laminated plate and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solidly integrate a surface material onto a substrate by improving an adhesion strength. SOLUTION: The surface material 2 is integrated by being laminated onto the surface of the substrate 1 containing resin via an adhesive sheet 3 containing the resin of the same material as that of the substrate 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated plate structure in which a surface material such as a veneer is laminated and integrated on the surface of a resin-containing base material, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, when a surface material such as a veneer is bonded to a base material made of a resin plate containing wood powder, it is bonded with an adhesive such as a solvent-based adhesive. ing. However, when a surface material such as a veneer is directly adhered to a resin-impregnated base material via an adhesive, there is a problem that adhesion to the base material is particularly poor and adhesive strength is low. If an attempt is made to increase the adhesive strength, a surface treatment is required for the base material, and there is a problem that the number of steps increases.

[0003] The present invention has been made in view of the above points, and an object of the present invention is to provide a laminate capable of improving adhesion strength and firmly integrating a surface material with a base material, and a method for producing the same. It is.

[0004]

In order to solve the above-mentioned problems, a laminated board of the present invention comprises a resin-containing substrate 1 and a surface material 2 on an adhesive sheet 3 containing a resin of the same quality as the substrate 1. Characterized in that they are laminated and integrated via By bonding between the base material 1 and the surface material 2 via the adhesive sheet 3,
The adhesive sheet 3 and the base material 1 are firmly integrated, and the adhesive strength of the surface material 2 to the base material 1 is improved, so that the bonding can be performed firmly.

It is also preferable that the adhesive sheet 3 is a sheet containing resin fibers of the same quality as the substrate 1.

It is also preferable that the adhesive sheet 3 is a composite of a paper layer 4 and a paper layer 5 containing resin fibers of the same quality as the base material.

It is also preferable that the adhesive sheet 3 is a composite of a paper layer 4 and a sheet layer 6 made of the same resin as the base material.

It is also preferable that the base material 1 is a resin plate containing wood powder containing wood powder and resin.

In the method for producing a laminate according to the present invention, the base material 1 containing the resin is continuously formed by extrusion, and the adhesive sheet 3 is softened immediately after the base material 1 is extruded. 1 and integrated, and thereafter, the surface material 2 is adhered to the adhesive sheet 3. By laminating and integrating the adhesive sheet 3 with the base material 1 in a soft state immediately after extruding the base material 1, the adhesive sheet 3 can be firmly integrated with the base material 1 by heat fusion, and The adhesive sheet 3 can be integrated simultaneously in the manufacturing process. As a result, the surface material 2 can be firmly integrated via the adhesive sheet 3 and can be easily manufactured even if it is bonded via the adhesive sheet 3.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a laminate according to the present invention, a surface material 2 is integrated via a bonding sheet 3 on a resin-containing base material 1 as shown in FIG. The base material 1 is, for example, a resin plate containing wood flour, and specifically, a polypropylene plate containing wood flour. The configuration of this wood flour-containing polypropylene plate is, for example,
50 parts by weight of wood powder, 45 parts by weight of a polypropylene resin, and 6 parts by weight of maleic acid-modified polypropylene. The thickness of the substrate 1 is about 0.5 to 20 mm. The surface material 2 is, for example, a veneer plate. As a specific example, the surface material 2 is a blank material having a thickness of 0.25 mm.

In the case of the example of FIG.
The base material 1 is a paper sheet containing resin fibers of the same quality.
In the case of FIG. 1B, the composite is a composite of the paper layer 4 and the paper layer 5 containing resin fibers of the same quality as the substrate 1. In the example of FIG. 1 is a composite of the same quality resin sheet layer 6. The thickness of the adhesive sheet 3 is, for example, about 100 μm.

The adhesive sheet 3 shown in FIG. 1A is a paper sheet, and the resin fibers are polypropylene fibers when the base material 1 is a polypropylene containing wood powder. This paper sheet contains pulp and resin fibers, but the amount of resin fibers is 40-70.
% By weight. The density of the paper sheet as the adhesive sheet 3 is 0.5 g / cm ³ or less. This adhesive sheet 3 is manufactured by papermaking similarly to paper.

The adhesive sheet 3 shown in FIG. 1B is a composite of a paper layer 4 and a paper layer 5 containing resin fibers. The paper layer 4 is a layer mainly composed of pulp or hemp. The layer 5 is a layer containing pulp or hemp and resin fibers. This resin fiber is the base material 1
Is polypropylene fiber containing wood powder. This paper layer 5 contains pulp and resin fibers, but the amount of resin fibers is 40 to 70% by weight. The density of the adhesive sheet 3 is 0.5 g / cm ³ or less. The polypropylene fiber as the resin fiber has a fiber length of about 5 mm and a thickness of about 2 denier. When the adhesive sheet 3 composed of the two paper layers 4 and 5 is manufactured, it is integrated by separately wet-making, laminating and drying, and if necessary, using a hot roll press. Reinforced. Specific products of the adhesive sheet 3 composed of the two paper layers 4 and 5 include a heat pack MW30 [Nippon Paperboard Co., Ltd.], a heat pack MW50 [Nippon Paperboard Co., Ltd.],
And desiccant bag base paper [Marubishi Paper Tech Co., Ltd.].
The adhesive sheet 3 is integrated so that the paper layer 5 containing the resin fibers faces the base 1.

The adhesive sheet 3 shown in FIG. 1C is a composite of a paper layer 4 and a resin sheet layer 6. The paper layer 4 is a layer of pulp, hemp, or the like. Layer. This sheet layer 6 is a polypropylene sheet when the base material is wood powder-containing polypropylene. This sheet layer 6
Has a thickness of about 10 to 100 μm. The paper layer 4 and the sheet layer 6 are laminated and bonded. The adhesive sheet 3 is integrated so that the sheet layer 6 side faces the substrate 1 side.

When the base material 1 made of a resin plate containing wood powder is formed, the base material 1 is formed by extruding with an extruder 8 as shown in FIG. 9, the adhesive sheet 3 is inserted between the substrate 1 and the roller 9 while the substrate 1 is soft, and the adhesive sheet 3 and the substrate 1 are integrated by applying heat and pressure. By doing so, the resin of the adhesive sheet 3 and the resin of the base material 1 are firmly integrated by heat fusion, and even a resin having a releasable property such as polypropylene is firmly integrated.

After the adhesive sheet 3 is integrated with the base material 1, the surface material 2 such as a veneer is integrated via the adhesive sheet 3. At this time, a vinyl acetate resin emulsion adhesive or aqueous vinyl urethane adhesive is used. It is adhered through an adhesive such as an agent. The hot press conditions for bonding the surface material 2 with an adhesive include, for example, a temperature of 110 to 130 ° C. and a pressure of 5
90000 to 780000 Pa (6 to 8 kgf / c
m ² ) for 30 to 120 seconds. The application amount of the adhesive is 50 to 120 g / m ² . By attaching the surface material 2 in this manner, it is possible to efficiently and quickly bond with a water-based adhesive without using a solvent-based adhesive. When the surface material 2 is bonded via the adhesive sheet 3, the density of the adhesive side of the adhesive sheet 3 to the surface material 2 is 0.5 g / cm ³ or less, and the adhesive sufficiently penetrates the adhesive sheet 3. The opening of the surface material 2 can be prevented, and the adhesiveness can be improved.

When the performance of the laminate of the present invention having the above-mentioned structure and the performance of the laminate of the conventional structure are compared, Table 1 shows that the performance of the present invention is excellent.

[0018]

[Table 1]

* Compared with the conventional veneer base paper, the thickness is 30 to 80
It is a reinforced paper for bonding to a veneer to reinforce with a thickness of about 20 μm (a basis weight of about 20 to 50 g / m ² ).
Such as hemp.

The performance according to the type of the adhesive sheet 3 is shown in Table 2 below. In any of the adhesive sheets (a), (b) and (c) in FIG. It can be seen that the surface material 2 such as a veneer can be firmly bonded.

[0021]

[Table 2]

The reason for setting the content of the resin fiber in the paper containing the resin fiber to 40 to 70% by weight is as follows. When the adhesive strength was evaluated in increments of 10% by weight, when the adhesive strength was 30% by weight or less, the adhesive force between the paper and the resin plate containing the wood powder was 690000 Pa (7 kgf / cm ² ) or less, which was the target (plane of plywood). The tensile strength is 690000 Pa or more). For this reason, the content of the resin fiber is set to 40% by weight or more. The upper limit of the resin fiber content is set to 70% by weight because paper cannot be formed at 70% by weight or more.
If the resin fiber is 100%, it is present as a commercial product, but it becomes a nonwoven fabric instead of paper. The non-woven fabric also adheres to the base material 1 such as a resin plate containing wood powder by heat fusion, but the resin fibers are brought into a dense state at the time of the heat fusion, and the adhesive for bonding the surface material 2 such as a veneer is impregnated. It is missing and cannot be glued.

[0023]

According to the laminate of the present invention, the surface material is laminated and integrated on the surface of the resin-containing base material via the adhesive sheet containing the same resin as the base material. The adhesive sheet and the base material are firmly integrated when they are bonded to each other with an adhesive sheet therebetween, so that the adhesive strength of the surface material to the base material is improved and the bonding can be performed firmly.

In the method for producing a laminate according to the present invention, a resin-containing base material is continuously formed by extrusion, and an adhesive sheet is laminated on the base material in a soft state immediately after extruding the base material. After that, the surface material is adhered to the adhesive sheet, so the adhesive sheet is laminated to the substrate in a soft state immediately after extruding the substrate, and the adhesive sheet is thermally fused to the substrate. It can be firmly integrated by bonding and can simultaneously integrate the adhesive sheet in the manufacturing process of the base material. It is also possible to firmly integrate the surface material via the adhesive sheet and easily adhere to it via the adhesive sheet It can be manufactured.

[Brief description of the drawings]

FIG. 1 shows the structure of a laminate according to an embodiment of the present invention,
(A), (b) and (c) are cross-sectional views of different examples.

FIG. 2 is an explanatory view illustrating a manufacturing process of the above.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Surface material 3 Adhesive sheet 4 Paper layer 5 Paper layer 6 Sheet layer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Satoru Konishi 1048 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Works Co., Ltd. (72) Inventor Koji Minami 1048 Kazuma Kadoma Kadoma City Osaka Prefecture Inside Matsushita Electric Works ( 72) Inventor Masasuke Tsukamoto 1048, Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Works Co., Ltd. DG01B DG10B DG10C EC031 EC182 EH171 EJ191 EJ202 EJ422 JB05G JK06 JL02 JL11B JL11C JM01G

Claims (6)

[Claims] 1. A laminate, wherein a surface material is laminated and integrated on the surface of a resin-containing base material via an adhesive sheet containing a resin of the same quality as the base material. 2. The laminate according to claim 1, wherein the adhesive sheet is a sheet containing resin fibers of the same quality as the base material. 3. The laminate according to claim 1, wherein the adhesive sheet is a composite of a paper layer and a paper layer containing resin fibers of the same quality as the base material. 4. The laminate according to claim 1, wherein the adhesive sheet is a composite of a paper layer and a sheet layer of a resin of the same quality as the base material. 5. The laminated board according to claim 1, wherein the substrate is a wood-floured resin plate containing wood flour and resin. 6. A resin-containing base material is continuously formed by extrusion molding, and an adhesive sheet is laminated and integrated with the base material in a soft state immediately after extruding the base material. A method for manufacturing a laminate, comprising bonding a surface material to a laminate.