JPH10258402A - Wooden composite board and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a wooden composite board, which has a required surface smoothness and, at the same time, in which no lowering of mechanical strength occurs, by a method wherein a wooden fiber board, which is bisected in the direction of the thickness of the board with a slicer or the like, is bondingly laminated to one side or both the sides of a wooden base material. SOLUTION: A wooden composite board is produced by bondingly laminating a bisected wooden fiber board, which is obtained by bisecting a wooden fiber board made of medium duty fiber board is bisected in the direction of the thickness of the board with a slicer or the like, onto one side or both the sides of a wooden base material. The slicer 10 consists of a fixed base table 11, a flat plate-like cutting knife 12, which is fixed to the fixed base table 11 under the condition that the distance between the surface of the fixed base table 11 and the slicer can be changed and fixed, and a roller 13 for feeding a feeding matter to be divided to the cutting knife under the condition that the feeding matter to be divided is urged to the surface of the fixed base table 11. In addition, conveyors 20 and 21 for carrying the matter to be divided are arranged before and after the slicer 10. By the thickness, which is employed by using bisected thin wooden fiber board, the thickness of the wooden base material can be made thicker, resulting in allowing to manufacture a wooden composite board, which has an excellent surface smoothness and, at the same time, a high mechanical strength, at low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood composite board and a method for producing the same, and more particularly, to a wood composite board having a wood fiber board bonded and laminated on one or both sides of a wood base material to achieve a smooth surface. It relates to the manufacturing method.

[0002]

2. Description of the Related Art A decorative wooden board in which a decorative surface layer such as a veneer or decorative paper is laminated on the surface of a wooden substrate is known and is used in a wide range of fields. Plywood, OSB as wood base material
(Oriented strand board), block board, laminated wood,
Many materials such as a particle board are used, but such a wooden base material has insufficient surface smoothness, and when a veneer or the like is stuck as it is, fine irregularities or cracks are formed on the surface of the decorative surface layer. May occur. for that reason,
Usually, some smoothing treatment is performed on the surface of the wooden base material.

As a smoothing process, typically, a surface polishing process using a wide sander or the like is performed. In order to obtain higher smoothness, for example, Japanese Patent Application Laid-Open No. 50-70509 and Japanese Patent Publication No. As described in JP 88375 gazette and the like,
After applying a filler to the surface of the wooden base material, drying, polishing and smoothing it, apply an adhesive on it, dry it, and paste thin paper on it to perform a multi-step process. Will be

As another surface smoothing treatment, a thin MDF (medium fiberboard) or HDF (hardboard) is bonded and laminated on the surface of a wooden base material. MDF and H
Wood fiberboard like DF has a smooth surface from the beginning,
In addition, since it has stable surface characteristics, there is an advantage that, in addition to a simple processing step, even when a veneer or decorative paper is stuck as a decorative surface material, cracks are hardly generated on the surface. Furthermore, since there is no anisotropy, there is an advantage that the physical properties such as swelling, shrinking and bending strength have no directionality.

[0005]

SUMMARY OF THE INVENTION However, MDF
Wood fiberboards such as DF and HDF are more expensive than plywood used as a base material, and wood composite boards that have been subjected to surface smoothing treatment by sticking wood fiber boards have other surface smoothness. The cost is higher than that of wood materials that have been subjected to chemical treatment. Furthermore, in the case of MDF, MDF as a surface layer
Is sufficient if the surface smoothness can be improved,
It is empirically known that a thickness of about 1.5 mm is sufficient for this purpose, but such a thin MDF is expensive and difficult to obtain from the market.

[0006] For this purpose, a thick MDF having a thickness of about 2.5 to 5.0 mm, which is relatively inexpensive and easily available, is usually used. In order to obtain a board, it can be manufactured at low cost, but on the other hand, the base material becomes thinner by the thickness of the MDF, and when manufacturing a thin wood composite board, the strength is reduced.

The present invention is a wood composite board having a wood fiber board such as MDF or HDF adhered to the surface layer, but it is relatively inexpensive to manufacture and has the required surface smoothness. Another object of the present invention is to provide a wooden composite board and a method for manufacturing the same without reducing the mechanical strength of the wooden composite board.

[0008]

A wood composite board according to the present invention for solving the above-mentioned problems is basically composed of a wood fiber board on one or both sides of a wood base material in a thickness direction using a slicer or the like. It is characterized in that divided parts are laminated by bonding. The wood fiberboard used is particularly effective in MDF (medium fiberboard), but may be another wood fiberboard such as HDF (hardboard).

Further, the present invention is characterized in that the wood fiber board is divided into two parts in the thickness direction by using a slicer or the like, and the two divided wood fiber boards are bonded and laminated on one or both sides of the wood base material. Also disclosed is a method for producing a wood composite board.

In the present invention, the wood substrate used is not particularly limited, and plywood, OSB, block board, laminated wood, particle board and the like can be appropriately used. Its thickness is also arbitrary. In addition, the wood fiber board is divided into two parts in the thickness direction using a slicer or the like, so that the thickness is 1.0 to 1.0%.
It is sufficient that at least one piece of wood fiber board of about 1.5 mm can be obtained, and preferably a wood fiber board having a thickness of 2.5 to 5.0 mm, which is currently widely available on the market.

This wood fiber board is divided into two pieces by, for example, a slicer having a sharp flat blade to obtain a thin wood fiber board, which is attached to the surface of the wood base material using an adhesive. The adhesive used may be an adhesive used for laminating conventional decorative materials, such as a formalin-based adhesive such as a urea resin, an acrylic-based adhesive, or a urethane-based adhesive, and is particularly limited to an adhesive component and a curing type. There is no. Also, the attaching method may be the same as the conventional one.

According to the present invention, a wood fiber board obtained by dividing a relatively thick wood fiber board, which is inexpensively and easily available from the market, into two in the thickness direction by a slicer or the like is used as a surface layer. The cost ratio of the wood fiber board to the base material can be reduced, and the thickness of the wood base material can be increased by the use of the thin wood fiber board, and the surface has excellent surface smoothness and high mechanical strength. Wood composite boards can be manufactured at low cost. A decorative board is produced by providing a surface decorative layer on the obtained wood composite board by veneer sticking or coating by a usual method.

[0013]

The present invention will be described below with reference to examples. Example 1 An MDF having a thickness of 2.7 mm was divided into two parts having a thickness of 1.35 mm by a slicer of the type shown in FIGS. The obtained MDF was stuck on both sides of softwood plywood having a thickness of 9.3 mm under the following conditions to obtain a thickness of 12 mm.
mm wood composite board was manufactured.

Laminating conditions Adhesive: urea resin adhesive Adhesive application: roll coater Adhesive application amount: 14 g / scale ² pressing: flat plate pressing pressing pressure: 8 kgf / cm ² pressing temperature: 120 ° C. pressing Time: 90 seconds

As shown in FIGS. 1 and 2, the slicer 10 is a flat plate attached to the fixed base 11 so that the distance between the fixed base 11 and the surface of the fixed base 11 can be changed and fixed. And a roll 13 for feeding the to-be-divided object to be sent to the surface of the fixed base 11 in a press-contact state to the to-be-cut blade 12, and for transporting the to-be-divided object before and after that. Conveyors 20 and 21 are arranged.

In this example, a 2.7 mm thick MDF
Is transported on the conveyor 20 toward the slicer 10,
It is sent toward the blade 12 by the roll 13 of the slicer 10. The blade 12 is a fixed base 11 of the slicer 10.
Is set at a distance of 1.35 mm from the surface of the
F is divided into two parts having a thickness of 1.35 mm. M divided into two
The DF is carried out by the conveyor 21.

[Comparative Example 1] The MDF used in Example 1 was attached to the front and back surfaces of a 6.6 mm thick softwood plywood in the same manner as in Example 1 without being divided into two parts. Boards were manufactured.

[Example 2] MDF having a thickness of 3.0 mm was
The same slicer was used to divide it into two pieces having a thickness of 1.5 mm. The obtained MDF was converted to an OS having a thickness of 13.5 mm.
B was bonded to one surface of B under the following conditions to produce a wood composite board having a thickness of 15 mm.

Lamination conditions Adhesive: Honeymoon adhesive (manufactured by Konishi Co., Ltd. (main adhesive: modified styrene / butadiene copolymer adhesive, primer: glyoxal)) Adhesive application: roll coater Primer application: air spray Adhesive application amount: 14 g / size ² primer applied amount: 4 g / size ² pressing: flat plate pressing pressure: 5 kgf / cm ² pressing time: 30 seconds

Comparative Example 2 A wood composite board having a thickness of 15 mm was bonded to one surface of an OSB having a thickness of 12.3 mm in the same manner as in Example 2 without dividing the MDF used in Example 2 into two parts. Was manufactured.

[Evaluation Method] The products 1 and 2 of the embodiment and the products 1 and 2 of the comparative example are JIS
An impact test (Dupont impact test) using K5400 was performed. That is, a shooting die and a cradle having a radius of 6.35 mm at the tip are arranged, and the test piece is sandwiched with the surface of the test piece facing upward so that the shooting die comes to the impact point of the test piece.
A 0 g weight was dropped from a height of 300 mm onto the shooting mold. Table 1 shows the results.

The wood composite board thus manufactured was converted into a size of 3 ′ × 6 ′ and the material costs were compared. However, the material cost of the MDF in the case of Comparative Example 1 was 1, and the others were represented by the ratio.
The values are shown in Table 1.

With respect to the products of Examples 1 and 2 and the products of Comparative Examples 1 and 2, 0.23 mm was formed on the MDF side surface by a conventional method.
Oak veneer was applied and urethane coating was performed by a conventional method. Then, after leaving at 80 ° C. for 2 hours,
The B test was repeated 10 times, which was repeated twice to stand for two hours, and the occurrence of cracks in the decorative layer was visually observed. The results are shown in Table 1.

[0024]

[Table 1]

[Consideration] As shown in Table 1, the impact test shows almost the same results for the products of Example 1 and Comparative Example 1 and for the products of Example 2 and Comparative Example 2. The number of cracks generated in the B test is also the same, and the mechanical strength and surface stability of the wood composite boards obtained in the example and the comparative example are almost the same. However, in the products of Examples 1 and 2, since the commercially available MDF was divided into two parts, the manufacturing cost was reduced by about 20% as compared with the comparative example. This shows the superiority of the wood composite board and the method for producing the same.

[0026]

According to the present invention, a wood composite board having substantially the same physical properties and surface characteristics can be obtained at low cost. Further, in order to obtain a wood composite board having the same thickness, since the wood fiber board portion (surface layer portion) becomes thin, the wood base material can be made thicker, and a wood composite board having high strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of a slicer that divides a wood fiber board into two.

FIG. 2 is an enlarged perspective view showing a slicer main body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Slicer, 11 ... Fixed base, 12 ... Flat blade, 13 ... Roller, 20, 21 ... Conveyor, M ... MDF

Claims (4)

[Claims] 1. A wood composite board characterized in that a wood fiber board obtained by dividing a wood fiber board into two in the thickness direction using a slicer or the like on one or both sides of a wood base material is bonded and laminated. 2. The wood composite board according to claim 1, wherein the wood fiber board is a medium fiber board. 3. A wood composite board, wherein the wood fiber board is divided into two parts in the thickness direction using a slicer or the like, and the two divided wood fiber boards are bonded and laminated on one or both sides of a wood base material. Manufacturing method. 4. The method for producing a wood composite board according to claim 3, wherein the wood fiber board is a medium fiber board.