JP2005199557A - Plywood and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ecological plywood which enables the effective use of wood by a thinning material, a waste material, or the like, can be used widely as a building material or the like in place of conventional veneer, and is produced easily. <P>SOLUTION: Surface and back side panel materials 2 and 3 of natural wood are laminated/adhered on/to the surface and back of an intermediate sheet 1 which is thin, flexible, and moderately cushioning. In the structure of the panel materials, two or more wood board pieces 4 are arranged in the width direction. In the surface and back side panel materials 2 and 3, the wood board pieces 4 are arranged perpendicularly to each other. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a plywood that can be widely used as a building material and the like, and more particularly, to an ecology-type plywood that enables effective use of wood from thinned wood, waste wood, and the like, and a method for manufacturing the same.

  Conventionally, veneer plywood is generally held as a plywood for building materials.

  A veneer plywood is a structure in which a plurality of thin single plates are laminated and bonded together with an adhesive to form a single plate. There is a problem that a strong adhesive is required and harmful gases are generated during incineration.

  In addition, the present inventors previously invented a three-layer construction thermal insulation panel in which front and rear panel materials mainly composed of natural wood are laminated and bonded to the front and rear surfaces of a plate-like thermal insulation material formed into a plate shape. Have filed patent applications (Japanese Patent Application No. 2002-352707, filed on Dec. 4, 2002). The panel material has a structure in which a plurality of wood board pieces having a predetermined width are arranged side by side in the width direction, and the plate-like heat insulating material is made of laminated corrugated paper or carbonized cork with a predetermined thickness. It is a structure molded into a shape, is not flexible, and has no breathability or water permeability in the thickness direction.

  The above-mentioned heat insulation panel by the applicant of the present application is an ecology type, and thinning and waste materials can be used for the front and back panel materials, and excellent experimental data is obtained as a heat insulation panel for buildings. It has been. However, the intermediate plate-like heat insulating material layer must be thick and expensive, and is difficult to use as a substitute for a relatively thin veneer plywood. In addition, in order for the three layers to be completely integrated by adhesion, a considerable curing period is required, and accordingly, the production takes time and is troublesome.

  The present invention has been made in view of the above points, and is an ecology-type plywood that enables effective use of wood by thinned wood, waste wood, etc., using the technology of the prior invention of the applicant of the present application. Therefore, an object of the present invention is to provide a plywood that can be widely used as a building material in place of a conventional veneer plywood and is easy to manufacture.

  In order to achieve the above object, the plywood 10 of the present invention, as shown in the embodiment of the figure, is a front and back panel material made of natural wood on the front and back surfaces of a thin and flexible intermediate sheet 1. 2 and 3 are laminated plywood 10 in which the panel material has a structure in which a plurality of wood board pieces 4 are arranged side by side in the width direction, and the front panel material 2 and the back panel material 3 are the wood board pieces 4. Are arranged perpendicular to each other.

  The intermediate sheet 1 is a sheet that is air permeable or water permeable, is thin and flexible or has some cushioning properties, and has a single layer or a plurality of layers in which corrugated paper is interposed between front and back sheets ( It is characterized by being a sheet selected from corrugated paper of about 2 to 3 layers), Japanese paper or Western paper, non-woven fabric, or woven fabric of natural or synthetic fibers. As the intermediate sheet 1 and the adhesive, an ecological type that does not generate harmful gas during incineration is used.

  In addition, it is desirable that a large number of through holes 1a are formed in the intermediate sheet 1 by passing the needle body. In particular, when the intermediate sheet 1 is formed of the above-described corrugated paper 1A or paper 1B such as Japanese paper or a non-woven fabric, the adhesive is evenly provided on the front and back through the small holes 1a by providing the needle-hole-shaped small holes 1a uniformly. Thus, the laminated bonding of the plywood 10 is stronger and can be performed in a short time. In the case of the woven fabric 1C, by woven the fibers relatively sparsely, through small holes are formed between the fibers, and it is not necessary to form the small holes as described above.

  Further, as described in the specification of the prior application by the applicant of the present application, the panel material is formed by connecting the adjacent pieces of wood 4 to each other with a long connecting member made of bamboo straws or cotton strings orthogonal to the width direction. 5 can be connected in advance. Such a connection structure facilitates handling of the panel material during manufacturing. The wood pieces 4 may be arranged closely without being connected to each other, or arranged with a small interval of about 1 mm to several mm.

  In order to manufacture the plywood according to the present invention, a wooden board piece 4 constituting the back panel material 3 is juxtaposed on the base plate, and an intermediate sheet 1 coated with an adhesive is laid thereon, and further What is necessary is just to carry out press-compression by arranging the wooden board piece 4 which comprises the front side panel material 2 on top. It is also effective to apply an adhesive to the opposing surfaces of the front and back side panel materials 2 and 3 in advance using a roll coater or the like. As a result, even when the adhesive turns evenly on the front and back of the intermediate sheet 1 and there are some irregularities on the opposing surfaces of the front and back panel members, the front and back side panel members 2 and 3 are evenly and firmly fixed via the intermediate sheet 1. To produce a plywood.

In the production of the plywood, it is effective to use corrugated paper 1A as the intermediate sheet 1 and apply an adhesive to the front and back surfaces by a roll coater in advance and press-bond.
In this case, the corrugated cardboard paper 1A has a waist unlike the paper or cloth, and therefore it is possible to easily apply the adhesive to the front and back by passing between the upper and lower pinch rolls of the roll coater. Can penetrate not only the opposing surfaces of the front and back panel members but also into the corrugated paper 1A, and the intermediate corrugated paper is thinly crushed and solidified to easily obtain a thin and strong plywood 10. In this case, the corrugated cardboard paper 1A does not need to have the needle hole-shaped small holes 1a, but by providing the small holes 1a, the speed of penetration and solidification of the adhesive can be increased.

  As described above, in the plywood of the present invention, the front and back side panel materials made of natural wood are laminated and bonded to the front and back surfaces of the thin and flexible intermediate sheet, and the panel material is made of a plurality of wood board pieces. It is a structure arranged side by side in the width direction, and the front side panel material and the back side panel material are arranged so that the parallel arrangement direction of the wood board pieces is perpendicular to each other on the front and back sides, so the front and back side panel materials are intermediate sheets Via, the fiber direction of the panel material is firmly and integrally joined so that it crosses, it has sufficient strength as a building material, and it becomes relatively thin as a whole, replacing the conventional veneer plywood, It can be widely used for various applications such as building materials. Also, air permeability or moisture absorption from the gap between the wooden board pieces can be expected.

  Further, in the present invention, during press-bonding, the adhesive spreads evenly over the opposing surfaces of the front and back panel materials through the intermediate sheet, and even if there are some irregularities in the opposing surfaces of the panel materials, the minimum amount Adhesive strength can be sufficiently obtained in a short time by using an adhesive. The effect is further improved by providing a relatively large number of needle hole-like small holes uniformly in the intermediate sheet.

  In the present invention, thinning and waste materials can be effectively used in large quantities for the front and back side panel materials, and since the use of adhesives is minimized, it is possible to effectively use resources, and generation of harmful gases during incineration disposal I can hold it down.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
1 to 3 show a first embodiment of the present invention.
The plywood 10 according to the present embodiment is a plywood obtained by laminating and bonding front and back side panel members 2 and 3 made of natural wood on the front and back surfaces of a thin intermediate sheet 1 having a thickness of about 1 cm to about 1 mm. In this structure, a plurality of strip-shaped wood board pieces 4 are juxtaposed in the width direction, and the front panel material 2 and the back panel material 3 are provided so that the juxtaposition directions of the wood board pieces 4 are orthogonal to each other. . The wooden board pieces 4 are densely arranged side by side, but a gap of about several mm may be provided. The plywood 10 is formed to be relatively thin, about several centimeters (about 3 cm) to about 1 cm.

  The wood board piece 4 can effectively use thinned wood or waste wood. As shown in FIG. 3, the intermediate sheet 1 has a single layer or a plurality of layers (2 to 3 layers) corrugated paper 1A, Japanese paper or western paper 1B, non-woven fabric, and corrugated paper interposed between front and back papers. Alternatively, it is formed of a woven fabric 1C made of natural or synthetic fibers. In the intermediate sheet 1 (1A, 1B), a large number of small through holes 1a (needle holes) can be formed relatively densely and uniformly.

  In this embodiment, as the intermediate sheet 1, the above-described corrugated paper 1A having a thickness of about 1 cm to about 0.5 cm is used. As the corrugated paper 1A, one having no small holes 1a (needle holes) is used, but one having a large number of through small holes 1a (needle holes) formed relatively densely and uniformly can also be used. . Such an intermediate sheet 1 (1A) has a waist, is easy to apply an adhesive using a roll coater, has a cushioning property during a laminating press operation, and is convenient for handling. Further, at the time of the press work at the time of manufacturing, the adhesive enters not only the front and back sides of the sheet but also the inside through the front and back paper or the small holes 1a, and is pressed more thinly, and the hardness of the plywood 10 is improved by the solidification of the adhesive. . As the adhesive, a non-polluting material that does not generate harmful gases during incineration, such as a starchy one, or a vinyl acetate adhesive, is used.

FIG. 4 shows a second embodiment of the present invention.
In the second embodiment, a concave groove 6 is formed continuously in the width direction on each of the plurality of wooden board pieces 4 constituting the front and back side panel material, and a long connecting member 5 made of bamboo string or cotton string is formed in the concave groove 6. Are connected to each other to connect the wooden board pieces 4 in the flat direction.
It is also possible to use the wood board piece 4 having such a connection structure for either one of the front and back side panel members 4. When the plywood 10 is manufactured by pressing, the lower wooden board pieces are arranged side by side on the press stand without being connected, and the upper wooden board pieces can have the above-described connection structure.

  The plywood of the present invention can be used as an interior material or exterior material for construction, and can be widely used as a formwork for construction or construction, a box material for transportation and storage, and a plate material for furniture and joinery.

It is a perspective view of an embodiment of a plywood according to the present invention. It is sectional drawing in the AA of FIG. It is a perspective view of an intermediate sheet. It is a perspective view of the wooden board piece made into the connection structure.

Explanation of symbols

10 Plywood 1 (1A, 1B, 1C) Intermediate sheet, 1a Small hole 2 Front panel material 3 Back panel material 4 Wood board piece 5 Connecting member 6 Groove

Claims (5)

  It is a plywood in which front and back panel materials made of natural wood are laminated and bonded to the front and back surfaces of a thin and flexible intermediate sheet, and the panel material has a structure in which a plurality of wood board pieces are arranged in parallel in the width direction. The plywood is characterized in that the front panel material and the back panel material are provided so that the juxtaposition directions of the wooden board pieces are orthogonal to each other.   The intermediate sheet is a breathable or water-permeable sheet selected from single-layer or multi-layer corrugated paper, paper, non-woven fabric, or woven fabric with corrugated paper interposed between front and back paper. The plywood according to claim 1.   3. The plywood according to claim 1, wherein a number of through holes are formed substantially uniformly in the intermediate sheet.   4. The plywood according to claim 1, wherein the panel members are connected to each other by a long connecting member orthogonal to the width direction.   It is a structure in which wood board pieces made of a plurality of natural woods are juxtaposed in the width direction on the front and back surfaces of an intermediate sheet made of corrugated paper of single or multiple layers with corrugated paper interposed between the front and back paper, In the manufacturing method of plywood in which the front and back side panel materials in which the juxtaposition directions of the wooden board pieces are orthogonal to each other are laminated and bonded, an adhesive is applied in advance to both the front and back surfaces of the intermediate sheet, and the intermediate sheet and the front and back side panel material A method for manufacturing a plywood, characterized in that it is pressed and solidified by press bonding.

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