JPS6282006A - Manufacture of board material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method of manufacturing a board material used for floors, fences, furniture surfaces, desk tops, etc.

(Prior Art) Conventionally, plywood has been formed by cutting somewhat thick wood in a spiral shape in the circumferential direction, stretching it into a flat plate, and pasting together several pieces of the flat plate.

However, with this manufacturing method, unless thick wood is used, the manufacturing efficiency and therefore the manufacturing cost will not be adequate. Therefore, thin wood such as thinned wood could not be used, and resources could not be used effectively. Furthermore, thicker wood is considerably more expensive than thinner wood, which also poses a problem in terms of production costs.

On the other hand, as shown in FIG. 5, for example, a trapezoidal piece of wood 21 is formed so that the wood conduit is exposed, and a large number of pieces of wood 21 are arranged in a plane to form one board 22. There is a manufacturing method to do this. According to this manufacturing method, a novel board material 22 can be obtained in which the conduit enhances the decorative effect, and there is an advantage that even thin wood such as thinned wood can be used.

(Problem to be solved by the invention) However, in the conventional product, two pieces of wood are used to prevent cracking.
The wooden piece 21 is cut at the center to form a trapezoid, which results in a reduction in the decorative effect of cutting across the center of the cut surface of the wood piece 21. That is, conventionally, cutting or notching across the center of the annual ring could not be avoided in order to prevent cracking. Therefore, there is a problem in that the wood piece 21 cannot be formed into a hexagonal, octagonal, circular, etc. shape including the center part of the annual ring without causing cracks.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, in this invention, the periphery of a plurality of living trees is formed into a predetermined shape, and the surrounding surfaces of the living trees are bonded together with an adhesive. After applying ventilation prevention treatment to the surroundings of the converging material, the conduit is cut to an appropriate thickness to expose the conduit to form a flat plate consisting of multiple ring sections. A method was adopted in which the front and back sides of the paper were dried at the same time.
(Function) That is, in the present invention, the entire surface of the ring section dries at the same time due to the ventilation prevention treatment applied to the periphery of the flat plate, so that no cracks occur. Therefore, there is no need to cut the ring section in the center or make radial cuts to prevent cracking. Therefore, the ring section can be formed into any shape, such as a square, hexagon, octagon, or circle, so that the entire conduit is exposed. Furthermore, since the front and back surfaces of the flat plate are dried simultaneously, the flat plate does not warp and, for example, does not break when bonded to a substrate.

(Example) An example embodying the present invention will be described below with reference to FIGS. 1 to 4.

1 is a circular piece of wood cut perpendicular to the direction of the trunk, and has a hexagonal cross section. Each ring section 1 has its circumferential surface bonded and fixed with an adhesive 2,
A single rectangular flat plate 3 is formed. An adhesive 4 is applied to the peripheral surface of the flat plate 3.

Reference numeral 5 denotes a substrate, which is formed to have the same size as the flat plate 3. A plywood 7 is formed by bonding the flat plate 3 and the substrate 5 using an adhesive 6.

The surface of the plywood 7 on the flat plate 3 side is sanded and is also coated with a clearing device.

Next, a method of manufacturing this plywood 7 will be explained.

First, as shown in FIG. 3, a raw tree 9 such as cypress, cedar, or pine is cut to a length of 500 mm with a good yield, and the wood 10 is sawn into a regular hexagonal column, and a plurality of hexagonal columns 11 are cut. Form a book. In this case, the cut surfaces of the hexagonal columns 11 are cut at right angles to the direction of the trunk. As shown in FIG. 4, one circumferential surface of each hexagonal column 11 is adhered with adhesive 2, and the hexagonal columns 11 are bundled into a rectangular parallelepiped shape to form a binding material 12. Adhesive 2 is a urethane adhesive, such as Sumitac G.
A-655 (trade name, manufactured by Sumitomo Bakelite Industries, Ltd.) is used. This Sumitank GA-655 has excellent adhesive strength and heat resistance, and the adhesive on the part that protrudes from the adhesive surface remains flexible even after drying, so it will not damage the blade of a machine tool during sanding. This is due to the effect of free water within the living wood, and the higher the moisture content within the living wood, the higher the adhesive strength. After the adhesive 2 dries, the circumferential surface of the binding material 12 is cut so that it has a rectangular cross section. Then, vinyl acetate adhesive 4 is applied to the circumferential surface of the converging material 12 to prevent drafts, and dried to some extent.
A plurality of flat plates 3 are formed by cutting into rounds with a thickness of 1 to 30 liters. In this case, the cut surface of the flat plate 3 should be perpendicular to the trunk.

Next, arrange the flat plates 3 on a wire mesh and leave them to air dry for about a week. The area around the flat plate 3 is treated to prevent drafts, so that it does not dry from the peripheral surface of the flat plate 3, but from the center of the ring section 1 (therefore, cracks may occur in the ring section 1 around the flat plate 3). In addition, since the flat plate is placed on a wire mesh to dry, the front and back sides are simultaneously dried, and the flat plate 3 does not warp.

Next, the adhesive 6 is applied to the entire surface of the substrate 5, the flat plates 3 are bonded together, and the plywood 7 is formed by cold compression.

At this time, since the flat plate 3 is not warped, no cracks will occur in the flat plate 3 when it is bonded to the substrate 5.

In this case, type (2) is used as the adhesive 6 for plywood used in a place with a lot of moisture, and type (2) is used for plywood used in a place with little moisture.

Finally, the surface of the plywood 7 is sanded down by 1 to 2 am to make the surface smooth. Then, apply a clear coat to the surface. Urethane paint or amino acid paint is good for clear paint.

In this invention, there is no need to make a cut at the center of the ring section 1 to prevent cracking, so the ring section 1 can be formed into any shape that exposes the entire conduit.

Note that the present invention is not limited to the above-mentioned embodiment, and the shape of the ring section 1 can be changed to a triangle, a quadrangle, a hexagon, a circle, etc. Moreover, instead of just combining items of the same shape, items of various shapes may be combined.

In the above embodiment, a vinyl acetate adhesive was used as the ventilation prevention treatment, but vinyl or water-repellent paper may be fixed to the circumferential surface of the binding material 12.

Further, although the convergence material 12 was sawn at right angles to the direction of the trunk, it may be cut diagonally, and the thickness may be 30 mm or more as long as it does not cause cracks.

Further, forced drying may be used as a drying method for the flat plate 3.

Effects of the Invention As detailed above, in this invention, the round slices dry from the center due to the ventilation prevention treatment applied to the periphery of the flat plate, so it is necessary to cut the round slices at the center to prevent cracking. Therefore, the ring section can be formed into any shape. Also, since the front and back sides of the flat plate were dried at the same time, the flat plate did not warp.

[Brief explanation of drawings]

1 to 4 show an embodiment embodying the present invention, FIG. 1 is a partially cutaway perspective view, FIG. 2 is a cross-sectional view, FIGS. 3 and 4 are perspective views showing the process in progress, and FIG. The figure is a perspective view showing a conventional plate material. Ring section 1, adhesive 2, flat plate 3, vinyl acetate adhesive for ventilation prevention treatment, raw wood 9, convergence material 12°

Claims (1)

[Claims] 1. The surroundings of a plurality of green trees (9) are formed into a predetermined shape, and the circumferential surfaces of the green trees (9) are bonded together using an adhesive (2) to form a convergence material (
12) is formed, and after applying draft prevention treatment (4) around the converging material (12), it is cut to an appropriate thickness so that the conduit is exposed, resulting in a plurality of ring sections (1). A method for producing a plate material, comprising forming a flat plate (3) and drying the front and back surfaces of the flat plate (3) at the same time. 2. The method for manufacturing a plate material according to claim 1, wherein the adhesive (2) is a urethane adhesive. 3. The method for manufacturing a board material according to claim 1, wherein the draft prevention treatment (4) is application of a vinyl acetate adhesive.