JP3584822B2 - Method for producing wood-like molded body - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for producing a wood-like molded product having a natural grain appearance and excellent surface properties such as texture and texture.
[0002]
[Prior art]
Conventionally, a wood-based molded product obtained by molding a composite material composed of a synthetic resin and a natural resin has been obtained by, for example, crushing a piece of wood such as a chip with a defibrator or the like as described in JP-A-8-142016. It is manufactured by adding a synthetic resin to a wood fiber obtained by fiber drawing, and molding this by heat compression molding. This wood-based molded article is used as a substitute for wood as synthetic wood having a texture and a touch close to that of wood.
[0003]
[Problems to be solved by the invention]
In such a conventional wood-based molded product, wood fibers are randomly present in the molded product, and the surface design is poor, that is, it is difficult to reproduce a grain resembling natural wood on the surface. Used only as a core material in interior products, electrical product cabinets, furniture and the like. Then, when the grain of natural wood is to be expressed on the surface, it is necessary to provide a skin material on which a grain pattern is printed, such as a vinyl chloride film, a melamine film, or a high quality paper. However, it was difficult to reproduce the texture and feel of natural wood with such a skin material.
[0004]
The present invention solves such a problem of the conventional wood-based molded article, and produces a wood-like molded article having a natural grain appearance and surface properties such as fine texture and tactile sensation of natural wood. Provide a way.
[0005]
[Means for Solving the Problems]
According to a first aspect of the present invention, a woven fabric is formed by using wood fibers as either a weft or a warp, and using a resin fiber as one of the other yarns. Melting the resin fiber and then solidifying the melted resin to produce a molded article in which the wood fibers are arranged in one direction, a method for producing a woody molded article is provided. You.
[0006]
According to a second aspect of the present invention, in order to solve the above problems, in the first aspect, a plurality of the woven fabrics are laminated and then heated and compressed to produce a molded body.
[0007]
In the first invention, it is possible to arrange the fiber directions of the wood fibers in one direction in advance by forming a woven fabric using wood fibers as either the weft or the warp and using the resin fibers as the other yarn. it can. Thereafter, by heating and compressing the woven fabric, the wood fibers are arranged in a certain direction, so that a grain of straight grain can be represented on the surface of the obtained molded article. In addition, by making the fabric into a woven fabric before heating and compressing, the handleability is improved.
[0008]
In the second invention, by laminating the above-described woven fabric, the thickness of the obtained molded body can be arbitrarily set, and a more complicated grain pattern can be reproduced.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
In the method of the present invention, first, a woven fabric is formed from wood fibers and resin fibers. There is no limitation on the form of the woven fabric. For example, as shown in FIG. 1, the woven fabric 1 is a warp yarn and the resin fiber 2 is a weft yarn. In addition to this, it is also possible to use oblique weave, satin weave or the like.
[0010]
Here, as the wood fiber 1, a fiber obtained by defibrating a natural material such as wood, hemp, palm, and bamboo can be used. The defibration method is not particularly limited, and a conventional method can be used. For example, a method in which wood such as hinoki, Japanese red pine, cedar, rawan, and beech is pressurized and steamed, and mechanically loosened with the same pressure, or steamed and then mechanically loosened at normal pressure can be used. .
[0011]
The resin fiber 2 may be any as long as it can be integrally formed with the wood fiber to form a molded body, and may be a thermoplastic resin such as high-density polyethylene, low-density polyethylene, polypropylene, polybutene, polyisoprene, polyester, nylon, Ethylene-propylene copolymer, polyethylene terephthalate and the like, and thermosetting resins such as epoxy resin, phenol resin and polyester can be used, but thermoplastic resins are preferred from the viewpoint of moldability, processability and the like.
[0012]
By forming a woven fabric from the wood fibers and the resin fibers, the fiber directions of the wood fibers can be aligned in advance. Here, the form of the wood fiber is preferably a twisted continuous fiber, and the diameter thereof is preferably 0.1 to 1 mm. It is also preferable that the resin fibers are similarly twisted.
[0013]
The content of the resin fibers in the woven fabric is preferably 20 to 50% by weight based on the total weight of the wood fibers and the resin fibers. If the amount is less than 20% by weight, a sufficient bond between the wood fibers cannot be obtained in the obtained molded article. If the amount is more than 50% by weight, the cost increases, and the woody content is poor due to the low content of the wood fibers. Because.
[0014]
The woven fabric thus obtained is heated and compressed in a mold, for example, a flat plate. The conditions for the heating and compression are appropriately adjusted according to the wood fibers and resin fibers to be used, and the amounts used thereof. When a thermoplastic resin is used as the resin fiber, the resin is heated and compressed to a temperature sufficient to melt the resin. By this heat compression, the thermoplastic resin fibers are melted between the wood fibers and fill the spaces between the wood fibers. Thereafter, the thermoplastic resin melted by cooling is solidified, and a molded article in which the fiber direction of the wood fibers is oriented in one direction is obtained. When a thermosetting resin is used as the resin fiber, the thermosetting resin is heated and melted to such an extent that the thermosetting resin is not cured. Allow the resin to cure.
[0015]
As shown in FIG. 2, a plurality of woven fabrics 3 made of wood fibers and resin fibers produced as described above are laminated in a thickness corresponding to a thickness to be obtained, and the resultant is heated and compressed by a flat plate 4. May be formed to form the woody molded body 5.
[0016]
【The invention's effect】
According to the method of the present invention, since the woven fabric of the wood fiber and the resin fiber is heated and compressed, the wood fiber is oriented in one direction in advance before the heating and compression, and the wood fiber is oriented in the obtained molded article in one direction. It can be oriented in the direction, and it is possible to obtain a woody molded body having a grain pattern similar to natural wood. Further, by using a woven fabric, the handleability of the material before molding is improved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a plain weave formed from wood fibers and resin fibers.
FIG. 2 is a process chart of forming a molded body by laminating a plurality of fabrics.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Wood fiber 2 ... Resin fiber 3 ... Woven fabric 4 ... Flat plate 5 ... Wood-like molded object

Claims (2)

Using a wood fiber as either a weft or a warp yarn, using a resin fiber as the other yarn to form a fabric, heating and compressing the fabric to melt the resin fiber, and then solidifying the melted resin Producing a formed body in which the wood fibers are arranged in one direction. The method for producing a wood-like molded product according to claim 1, wherein a plurality of the woven fabrics are laminated and heated and compressed.

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