JPH03227232A - Laminate - Google Patents

Abstract

PURPOSE:To obtain a laminate having little errors or distortions in dimension or shape, being light in weight and waterproof, having uniform strength in the face direction thereof, and being easy to process, by a method wherein two wooden base sheets each formed by arranging a plurality of sheet form wood pieces are opposed to each other, with a gap therebetween, in the face direction thereof, and a hard foamed polyurethane layer is provided in the gap to unite the base plates. CONSTITUTION:A recessed part 4A formed at a butt end of each rectangular wood piece 4 is fitted, and adhered by an adhesive, to a corresponding projected part 4B of an adjacent rectangular wood piece 4, thereby forming a base plate 2. A foamed polyurethane layer 3 is produced by setting a gap 5 between two such base plates 2, 2, assembling a metallic mold along peripheral parts of the base plates 2, 2 to surround the gap 5, then pouring a polyurethane resin into the mold, and foaming and curing the resin. The laminate 1 thus obtained can be produced in any desired length and width, with a reduced weight and waterproofness. Further, the laminate 1 has uniform strength in both the directions thereof, and is not reduced in the strength at cut parts, so that no additional reinforcement is required. When electric wire or cable, gas pipe or the like is passed through a through-hole 3A formed in the polyurethane layer 3, there is no need for special support fittings or the like.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is suitable for use as a material for building materials such as wall materials, floor materials, partition materials, panel materials, kitchen furniture, washroom furniture, etc. Regarding laminates.

[Conventional technology and problems]

Conventionally, board materials used as materials for assembling walls, doors, etc. generally include solid veneer, plywood, synthetic boards such as particle board, and flashboard.

Among these plate materials, the veneer is expensive and heavy, which is disadvantageous in terms of handling during transportation, construction, processing, etc. Furthermore, although veneer plywood and particle board are cheap, they are also heavy and have the same disadvantages as the veneer board. Furthermore, the veneer board is easily distorted due to warping, and plywood, particle board, and flashboard also have a problem in that their dimensions and shapes are easily distorted when they absorb water. Furthermore, the flashboard is advantageous in terms of handling as described above because of its low price and small weight, but its structure is made by bonding two thin boards together using a frame material arranged appropriately. Therefore, there is a hollow part in the part where the frame material is not located, and the strength in the plane direction, that is, the thickness direction of the board material in that part is small (as a result, in addition to being depressed when pressed, there is a hollow part in the part where the frame material is not located. When cut in sections, the hollow section is exposed and a separately prepared reinforcing material must be fitted into that section, which is a disadvantage. In the case of electrical circuit wiring,
It is completely unsuitable for inserting and supporting piping of a gas supply path inside the plate material. That is, in the case of the veneer, plywood, and particle board, it takes time and effort to form through holes for the wiring, etc., and in the case of flashboard, the cables, etc. for the wiring, etc. are inserted into the cavity of the flashboard. Metal fittings, etc. to support it must be installed in advance. Furthermore, if water splashes on one surface of conventional board materials, it will penetrate and reach the other surfaces, leaving the board in a wet state and making it difficult to dry, making it difficult to use it for kitchens, bathrooms, etc. To do this, special water-resistant treatments must be applied to surfaces that come into contact with water.

[Means for solving problems]

The present invention has been made to solve the above-mentioned problem, and therefore, according to the present invention, two wooden substrates each formed by arranging a plurality of plate-shaped pieces of wood are spaced apart in the surface direction. A laminate is constructed by forming a hard urethane foam layer in the gap and bonding the substrates to each other by the urethane foam layer.

[Effect]

The laminate according to the present invention has a structure in which a hard urethane foam layer is provided as an intermediate layer between two wooden substrates, each of which is formed by arranging a plurality of plate-shaped wood pieces. The dimensions of the laminate are set according to the number of boards used, and the weight is smaller than that of veneer, plywood, or particle board of the same thickness, and even if one board gets water, it will not reach the other board. does not reach or penetrate. Also,
The laminate according to the present invention, which has a hard urethane foam that does not absorb water in the intermediate layer, has little deviation in size and shape. Moreover, the strength in the plane direction is uniform in any part of the substrate. Furthermore, the foamed urethane layer is easy to process, such as forming through holes.

〔Example〕

1 to 3 show an embodiment of a laminate according to the present invention. In the figure, reference numeral 1 denotes a laminate according to the present invention, which is made up of a pair of wooden substrates 2.2 and a hard urethane foam layer 3. More specifically, each board 2 is formed by arranging a plurality of plate-shaped wood pieces 4. That is, each piece of wood 4 has a rectangular shape with a width of, for example, about 1Q cm, and these pieces are connected by, for example, fitting together recesses 4A and protrusions 4B formed on mutually adjacent butt ends. A substrate 2 is formed. In that case, it is advantageous to apply an adhesive between the recessed portion 4A and the convex portion 4B, since the bonding force between the pieces of wood 4 will be increased and the bonded state will be stabilized. As this piece of wood 4, wood that has been dried and processed into a plate shape using a normal method may be used.
In addition, Patent No. 1204986 (name of invention = “
“Method of processing wood into a buried wood shape”; Patent application 1986-3921
2, Japanese Patent Publication No. 58-18205) may be used. Further, the foamed urethane layer 3 has a gap 5 in the plane direction between the substrates 2, 2.
A mold is attached to the peripheral edges of both substrates 2, 2 so as to surround the gap 5, and urethane resin is injected, foamed, and cured.

According to such a configuration, the laminate 1 has a narrow piece of wood 4
By arranging the required number of substrates 2.2, it is possible to freely manufacture substrates 2.2 of various sizes from large to small in vertical and horizontal dimensions.

In addition, since the foamed urethane layer 3, which weighs less than wood, is provided between the substrates 2 and 2, the overall weight of the laminate 1 is lighter than the aforementioned veneer or the like. Furthermore, since the hard urethane foam layer 3 has independent bubbles, it does not absorb water, and water on one substrate 2 is prevented from reaching the other substrate 2, so the laminate 1 is waterproof. Therefore, it is suitable as a material for construction or furniture in places where water is used, such as bathrooms and kitchens.

In particular, in the laminate 1 using the substrate 2 made of wood pieces 4 subjected to the treatment method according to the patent, moisture and tree sap in the wood pieces 4 as the material of the substrate 2 are completely removed by evaporation. Its composition changes to a state in which only fibers remain, and as a result, it exhibits water absorption similar to that of conventional dried wood, but its ability to drain absorbed moisture is much higher than that of conventional dried wood. have. As a result, the laminate l made up of the substrate 2 made of such wood pieces 4 dries in a short time even if it absorbs water, so it is difficult to break and is therefore suitable for use as an interior material for bathrooms that are exposed to a lot of water and humidity. It is particularly suitable as

Further, since the foamed urethane layer 3 exists over the entire gap 5 of the substrates 2.2, the strength in the plane direction is uniform over the entire surface of the substrates 2, 2, and therefore, the strength in the plane direction, that is, the laminate 1. No matter where you cut the material in the thickness direction, the strength of the cut portion will not decrease. Therefore, there is no need to further fit a reinforcing member into the cut portion as in conventional flashboards.

Furthermore, since the hard urethane foam layer 3 does not expand or contract or absorb water after curing, there is an advantage that changes in the thickness of the laminate 1, that is, deviations thereof, are reduced.

In addition, when using this laminate l as a partitioning material for a building, all that is required is to form a through hole 3A in the urethane foam layer 3 as shown in FIG. 3, and insert an electric wire, gas pipe, etc. therein. These can be supported without requiring special metal fittings or the like.

Note that it is of course possible to attach a separately prepared edge member to the peripheral edge of the laminate 1 for connection with other building members or for decoration or protection.

Figures 4-6 show another embodiment of the invention. In these figures, the same reference numerals used in the first embodiment indicate the same elements. code 7
is a laminated board, and a waterproof sheet 8 is pasted on each side 2A of a pair of substrates 2, 2 as described in the first embodiment. The waterproof sheet 8 may be, for example, cellulose paper impregnated with a water-resistant synthetic resin, or a water-resistant synthetic resin sheet, which is attached to each of the substrates 2 with an adhesive. Then, with the side substrates 2.2 facing each other so that the waterproof sheets 8 face each other, the urethane foam layer 3 as described above is filled and formed in the gap 9, and the urethane foam layer 3 is replaced by the urethane foam layer 8. It is coupled to the substrates 2, 2 via 8.

Such a laminate 7 provides the same advantages as the laminate 1 in the first embodiment described above, and also has the advantage that the substrate 2
．． By interposing the waterproof sheet 8 between the substrate 2 and the foamed urethane layer 3, the waterproofness between one substrate 2 and the other substrate 2 becomes even higher.

〔Effect of the invention〕

As described above, the laminate according to the present invention has a structure in which a hard foamed urethane layer is interposed between the wooden substrates made of a plurality of wood pieces arranged side by side. It is easy to manufacture products of any size and size.
(b) By using narrow pieces of wood, the utilization efficiency of wood becomes extremely high, which lowers the material cost, and because it is easy to manufacture, the price is low, and (c) the weight is reduced, making it easier to transport. (d) It is waterproof, so it is convenient for use as building materials for bathrooms, furniture, etc., and (e) It has uniform strength in the plane direction and is thinner in the thickness direction. Since there is little deviation, no special additional processing is required when cutting, and (f) special support fittings, etc. are not required when wiring or piping is installed in the gap between boards, so processing or construction is not required. Time work is simplified, etc.
This has extremely excellent practical effects.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of a laminate according to the present invention;
Figure 2 is an enlarged cross-sectional view taken along the line ■-■ in Figure 1;
The figures are an enlarged vertical sectional view taken along the line ■-■ in Figure 1, Figure 4 is a perspective view showing another embodiment of the laminate according to the present invention, and Figure 5 is a perspective view showing another embodiment of the laminate according to the present invention.
The figure is an enlarged cross-sectional view taken along the line ■--■ in FIG. 4, and FIG. 6 is an enlarged longitudinal cross-sectional view taken along the line Vl--■ in FIG. 1.7... Laminate board 2... Substrate 3... Urethane foam layer 4: Wood piece

Claims (1)

[Claims] Two wooden substrates each formed by arranging a plurality of plate-shaped wood pieces are placed facing each other with a gap in the surface direction, and a hard urethane foam layer is formed in the gap, and the urethane foam layer A laminate, characterized in that it is constructed by bonding the substrates together.