JP2003094412A - Woody plate and method for manufacturing woody plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily manufacture a light-weighted woody plate of a high strength. SOLUTION: Woody formed plates 2 and 4 are laminated as a front layer and/or a rear layer on a core layer 3 formed by bonding wood chips F with a thermoplastic resin for reinforcement. A mixture M of a thermoplastic resin melt R and the wood chips F is fed and accumulated on the woody formed plate 2, and then the woody formed plate 4 is placed thereon to manufacture the woody plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wood board used as a building material and a method for manufacturing the wood board.

[0002]

2. Description of the Related Art Conventionally, in this type of wood board, a resin is mixed as a core layer into a wood finely divided material, steam injection pressing is performed to form the core layer, and the core layer is adhered to the front and back surfaces of the core layer. There is provided a laminate of wood molding boards such as plywood, medium density fiber board, and thin particle board according to the agent (Japanese Patent Laid-Open No. 2000-1.
17709).

[0003]

The above wooden board is manufactured by a method in which a core layer is formed once and the wood formed board is adhered to the front and back surfaces of the core layer with an adhesive. A lot of work is required, and an adhesive is also required.

[0004]

Means for Solving the Problems As a means for solving the above-mentioned conventional problems, the present invention provides a wood molding board as a surface layer and / or a back layer on a core layer (3) in which a piece of wood F is bound by a thermoplastic resin. A wooden board (1) in which (2,4) is laminated is provided. It is preferable that the thermoplastic resin is a recycled resin, and that the wood component of the wood molding boards (2, 4) of the front and back layers and / or the wood piece F of the core layer (3) is a recycled product.
Further, the wood piece F of the core layer (3) has a thickness of 0.1 to 5 mm and a length of 1 to 5.
The width is preferably 50 mm and the width is 0.5 to 20 mm. Further, according to the present invention, the thermoplastic resin melt R is formed on the wood molding plate (2).
The mixture M of the wood and the wood pieces F is supplied and accumulated, and the wood forming plate (4) is placed on the mixture M and press-formed to form the front and back layers (2,
There is provided a method for manufacturing a wooden board (1) in which the core layer (3) and the core layer (3) are integrated.

[0005]

In the present invention, the core layer has a rough structure by using wood chips. However, since the wood molding plate having a fine structure is used for the front layer and / or the back layer, high strength can be obtained even if it is lightweight. Further, in the present invention, a mixture of a thermoplastic resin melt and wood chips is deposited on the wood molding board, and the wood molding board is placed and pressed on it, so that the wood molding board and the core layer are the front and back layers. Are bonded and integrated by the thermoplastic resin melt of the core layer. Therefore, an adhesive is not required for bonding the core layer and the front and back layers.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention is described in detail below. [Core Layer] The core layer of the present invention is obtained by binding wood chips with a thermoplastic resin. The above wood pieces are manufactured from wood by cutting with a flaker, and preferably have a thickness of 0.1 to 5 mm, a length of 1 to 50 mm, and a width of 0.5 to 20 mm.
More preferably, the thickness is 0.5 to 1 mm, the length is 20 to 25 mm,
It has a width of 4 to 8 mm. As the wood used as the raw material of the above-mentioned wood pieces, it is preferable to use dismantled wood generated when the building is dismantled, scraps generated when the wood is cut, and the like. By using such recycled products, advanced utilization of wood waste can be achieved.

Examples of the thermoplastic resin for binding the wood chips include polyethylene, polypropylene, ethylene-
Propylene copolymer, ethylene-vinyl acetate copolymer,
Polyvinyl chloride, polyvinylidene chloride, polystyrene,
Polyvinyl acetate, fluororesin, thermoplastic acrylic resin,
Thermoplastic polyester, thermoplastic polyamide, thermoplastic urethane resin, acrylonitrile-butadiene copolymer, styrene-butadiene copolymer, acrylonitrile-butadiene-styrene copolymer, ethylene-propylene copolymer, ethylene-propylene terpolymer, ethylene -A thermoplastic synthetic resin such as a vinyl acetate copolymer is used. As the thermoplastic resin, it is preferable to use a pulverized product of the waste material of the thermoplastic resin molded product, or a product obtained by melting and pelletizing the pulverized product. By using such a recycled resin, it is possible to highly utilize the resin waste.

[Wood Molded Plate] In the wood plate of the present invention,
The wood molding board used as the front and back layers is a hard board,
Plywood, medium density fiberboard, particle board, bagasse board and the like, which have a dense structure.

[Production of Wood Board] In the production of the wood board of the present invention, first, a mixture of a thermoplastic resin melt and wood chips is supplied and deposited on a wood molding board. In this case, the mixing weight ratio of the thermoplastic resin melt and the wood chips is usually 20 / 80-40.
/ 60 (thermoplastic resin / wood chips). Then, a wood molding plate is placed on the top and press molding is performed. The pressing pressure at this time is usually 3 to 8 MPa.

Specifically, for example, the forming apparatus shown in FIG. 1 is used, and the conveying conveyor of the forming apparatus is used.
(5) While the wood forming plate (2) is placed and conveyed through the template (6) on top of it, the thermoplastic resin is fed from the orifice (8) of the die (7) arranged above the conveyor (5). The melt R is discharged and flowed down, and the wood chips F on the supply conveyors (9, 9) are sprayed from both sides by the supply rolls (10, 10) and added into the resin melt R. The resin melt R is stretched and subdivided to obtain a mixture M in which the resin melt R and the wood chips F are uniformly mixed, and the mixture M is provided on the wood molding plate (2) with a core layer (3A). Supply and deposit.

Next, the wood molding plate (2) on which the raw core layer (3A) is deposited is set in the press molding device (11) together with the template (6). The press molding device (11) includes a lower plate (12) and an upper plate (1).
The upper plate (13) is connected to the suction passage (14), and the wood molding plate (4) is suction-held on the mold surface. And the lower board
(12) is raised to polymerize and press the wood molding plate (2), the core layer (3A) and the wood molding plate (4). In this way, as shown in FIG. 3, the front and back layers (2, 4) are made of a wood molding plate, and the core layer (3) is made of a wood piece F bound with a thermoplastic resin melt R to form a three-layer structure. A wood board (1) is manufactured. In the present invention, a two-layer structure including a core layer and a front layer or a back layer may be used.

Examples 1 to 3 Examples of the present invention will be shown below. As the wood molding plates (2,4) for the front and back layers, 2.5 mm thick hard board, single plate and MDF shown in Table 1 were prepared. As the wood piece F for the core layer, demolition wood is crushed and fragmented with a flaker, etc., and has an average thickness of 0.5 to 1 mm and a length of 20 to 25.
A piece of wood having a width of 4 to 8 mm was obtained. Waste polypropylene was used as the thermoplastic resin and pelletized into a pulverized product.

[0013]

[Table 1]

Using these raw materials, the forming apparatus shown in FIG. 1 is used to first mount the wood forming plate (2) for the surface layer on the template (6) moving on the conveyor (5). I put it. On top of that, 2 pieces of crushed polypropylene molding waste
It is melted at 00-220 ° C and melted and discharged from the orifice (8) of the die (7), and the wood pieces F are sprayed from both sides (wood piece F:
Polypropylene melt R = 7: 3) and polypropylene M melt R was mixed while stretching and thinning to deposit a mixture M, which was used as a raw core layer (3A). Then raise the lower board (12),
The wood molding plate (4) for the backing layer, which is held on the press upper plate (13) by suction, is pressed and laminated on the raw core layer (3A), and the press is continued to integrally mold the wood plate (4). 1) (pressing pressure 3 to 8 MPa).

[Comparative Example 1] A wooden board prepared by molding only the raw core layer (3A) without the wooden molded boards (2, 4) for the front and back layers in the above-mentioned Examples was designated as Comparative Example 1. Table 2 shows the results of measuring various physical properties of the above Examples 1 to 3 and Comparative Example 1.

[0016]

[Table 2]

According to Table 2, Examples 1 to 3 having the wood molding plates on the front and back layers have higher strength than the comparative example having only the core layer, but there is no difference in specific gravity and light weight is secured. Is recognized. Also, the dimensional stability is significantly improved as compared with the comparative example, and it is recognized that the nail holding power is also large.

[0018]

According to the present invention, a high-strength and lightweight wooden board can be easily manufactured in almost one shot.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.

FIG. 1 is an explanatory diagram of a forming device

FIG. 2 is an explanatory view of a press molding device.

[Fig. 3] Cross-sectional view of a wooden board

[Explanation of symbols]

1 Wood board 2,4 wood molding board 3 core layer F piece of wood M mixture R Thermoplastic resin melt

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 2B200 AA01 BA06 CA15 CA20 DA21                       EF01 HA05                 2B250 AA01 BA09 CA11 DA01 FA21                 2B260 AA20 BA02 BA15 BA18 CB01                       CB04 CD02 DA01 DA18                 4F100 AK01B AK07 AP00A AP00B                       AP00C AP03 BA03 BA06                       BA10A BA10C EJ17 GB07                       JB16B JL16B

Claims (5)

[Claims] 1. A wood board characterized in that a wood molding board is laminated as a front layer and / or a back layer on a core layer obtained by binding wood pieces with a thermoplastic resin. 2. The thermoplastic resin is a recycled resin.
Wood board described in 3. A wood component of the front and back layers of a wood molded plate and / or
The wood board according to claim 1 or 2, wherein the wood piece of the core layer is a recycled product. 4. The wood piece of the core layer has a thickness of 0.1 to 5 mm and a length of 1.
The wooden board according to claims 1 to 3, which has a width of -50 mm and a width of 0.5-20 mm. 5. A front and back layer and a core layer are integrated by supplying and depositing a mixture of a thermoplastic resin melt and wood chips on a wood molding plate, and placing the wood molding plate thereon and press-molding. The method for manufacturing a wood board according to any one of claims 1 to 4, wherein