JP2530952B2 - Composite plate manufacturing method and composite plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a composite board and a composite board, and more particularly to a method for manufacturing a composite board and a wood board bonded with a wood fiberboard on the surface of a softwood veneer or plywood. Regarding

[0002]

2. Description of the Related Art Conventionally, as a building material, a laminate of wood veneers as a base material or a plywood plywood with a decorative paper or veneer stuck to the surface thereof has been used. There are various types of wood used as the base material,
Conifers are also being used as a material.

[0003]

However, in a veneer using a coniferous veneer or a coniferous plywood as a base material, the coniferous tree has many knots, knots, eye drops, etc., and has poor surface properties. It is difficult to obtain the smoothness of the surface due to the fact that the surface hardness is small, and when the veneer is stuck, the veneer is easily cracked due to the expansion and contraction of the base material. ing.

As a means for solving the problem, a hardboard or a wood fiberboard such as MDF is attached to the surface of a coniferous veneer or plywood. The wood fiberboard is generally swelled by water absorption in the thickness direction. There is a drawback that the rate is large and it swells in the thickness direction when it absorbs water, and when it is stretched on plywood, warping and twisting occur, and even if a decorative paper or veneer is stuck on it, it is not always satisfactory. It has not been obtained.

It is an object of the present invention to obtain a composite material using a coniferous veneer or a plywood as a base material, having a sufficient surface hardness and minimizing the occurrence of twist and warp. . Another object of the present invention is to obtain a composite board based on softwood, which does not cause cracking or damage of the veneer or the decorative paper even when the veneer or the decorative paper is attached to the surface.

[0006]

In order to solve the above problems and achieve the object, the present inventors have found many relations between the veneer and plywood of coniferous wood and the thickness of the wood base material stuck to the surface thereof. An experiment was conducted, and when the thickness of the wood fiber board used was about 8% to 17% of the total thickness of the composite board and 2 mm or less was used, the conventional softwood was used as the base material. It has been found that a composite plate which does not have the above-mentioned drawbacks of a decorative plate can be obtained, and the present invention has been completed.

That is, the present invention relates to a method for producing a composite board by using a softwood board as a base material, placing a wood fiber board on the surface of the board through an adhesive, and then hot pressing the whole board. , The thickness of the wood fiberboard used is about 8% to 17% of the total thickness of the composite board, and 2 mm
Disclosed is a method for manufacturing a composite plate, which is characterized by the following, and a composite plate manufactured by such a method.

The base material may be a plurality of softwood veneers laminated with an adhesive, or may be plywood of softwood. Further, it is also possible to appropriately join and use waste materials such as a core material of raw wood made at the time of manufacturing plywood as a base material and a scrap material made when cutting plywood into a rectangle,
It can also contribute to the effective use of wood resources.

As the adhesive, all adhesives of general wood materials such as urea resin adhesive, melamine resin adhesive, vinyl acetate adhesive and the like may be used, and the heat and pressure means may be ordinary heat such as hot press. The pressure device and conditions can be used as is.

[0010]

According to the present invention, the wood fiber board to be attached to the base material of coniferous wood has a thickness of about 8% to 1 with respect to the total thickness of the composite board.
By using 7% and 2 mm or less,
While maintaining the surface smoothness and surface strength of the wood fiberboard as a surface material, the wood fiber is about 25% of the total thickness of the composite board like a conventional softwood board, and about 3 mm. It was possible to obtain a composite plate having a warpage or twist of about 1/10, which is less than that of the composite plate to which the plate is attached.

[0011]

EXAMPLES The present invention will be described below with reference to examples.

[0012]

Example 1 A wood fiberboard (MDF) having the same shape and a thickness of 1.6 mm and having a thickness of 2.6 mm and a thickness of 2.6 mm and a wood fiber board (MDF) having the same shape was laminated on the surface of a base material, and a laminate of 5 ply and 12 mm 10 were created. All adhesives used were Yulia Melamine adhesives. 10 kg / cm ^{2 of} those laminated bodies
It was attached by hot pressing under the press conditions of 125 ° C. for 5 minutes. After molding, it was left in the atmospheric environment for one day and the warp amount was measured. The average warpage amount of the 10 composite plates was 0.2 mm. The "warpage" amount was measured as the maximum distance from the installation plane to the curved surface by placing the curved (warped) laminated body on a flat surface in a flat state.

[0013]

Example 2 On a surface of a 30 cm × 30 cm, 11 mm thick softwood plywood, a wood fiber board of the same shape and a thickness of 1.0 mm (MD
F) was laminated to form 10 12 mm laminated bodies. As the adhesive, all urea adhesives were used. The laminates were attached by hot pressing under a press condition of 10 kg / cm ² , 125 ° C. and 25 minutes. After molding, the molded product was left in the atmospheric environment for one day and night, and each warp amount was measured as in Example 1. The average warpage amount of the 10 composite plates was 0.3 mm.

[0014]

[Comparative Example 1] 3.0 cm of the same shape was formed on the surface of a base material in which four softwood veneer sheets of 30 cm x 30 cm and a thickness of 2.25 mm were laminated.
Thick wood fiberboards (MDF) were laminated to form 10 laminates of 5 ply and 12 mm. The adhesive and the pressing conditions were the same as in Example 1, after forming the composite plate, the composite plate was left in the atmospheric environment for one day and night, and the amount of warpage was measured. The average warpage amount of the 10 laminated bodies was 1.5 mm.

[0015]

[Comparative Example 2] A wood fiberboard (MDF) having the same shape and a thickness of 3.0 mm on the surface of a 30 cm x 30 cm, 9 mm thick softwood plywood.
Were laminated to form 10 laminated bodies of 2 ply and 12 mm.
The adhesive and pressing conditions were the same as in Example 1, after the composite plate was molded, the composite plate was left in the atmospheric environment for one day and night, and each warp amount was measured in the same manner. The average warp amount of 10 laminated bodies is 1.2.
It was mm.

Table 1 shows the average amount of warpage in each example and comparative example.

[0017] As is clear from this result, in the composite material having the same thickness, the thickness of the wood fiberboard (MDF) attached to the surface of the base material is equivalent to 8% to 17% of the thickness of the composite board to be formed. If the thickness is 2 mm or less (1.6 mm, 1.0 mm), the amount of warpage is significantly smaller than that of the pasted one with a thickness of 3 mm. I understand.

[0018]

Since the composite board produced by the method of the present invention has the above-mentioned constitution, it is a composite board using a softwood as a base material, but has good surface property and improved surface hardness. Obtainable. Further, even when the decorative paper or the veneer is attached to the surface, it is possible to prevent the damage or crack. Furthermore, it is possible to obtain a composite plate with a small amount of warpage and twist as a whole.

Claims (4)

(57) [Claims] 1. A wood fiber used in a method for producing a composite board by using a softwood board as a base material, placing a wood fiber board on the surface of the board through an adhesive, and then hot-pressing the whole board. A method for producing a composite plate, characterized in that the thickness of the plate is about 8% to 17% of the total thickness of the composite plate and 2 mm or less. 2. The base material is formed by laminating a plurality of softwood veneers with an adhesive interposed therebetween.
The manufacturing method described. 3. The method according to claim 1, wherein the base material is plywood of coniferous wood. 4. A composite board in which a wood fiberboard is attached to the surface of a base material which is a board of coniferous wood, and the thickness of the wood fiberboard is about 8% with respect to the total thickness of the composite board. A composite plate characterized by being -17% and 2 mm or less.