JP4869678B2 - Compressed wood product manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a compressed wood product, which easily mounts a reinforcing member for reinforcing compression-molded wood to the wood. <P>SOLUTION: The manufacturing method of the compressed wood product includes: a compression process for compression-molding wood into a three-dimensional shape; and a synthetic resin part forming process for arranging the wood compressed in the compression process in an injection mold and a synthetic resin is injection-molded to form a synthetic resin part having a predetermined shape on the surface of the wood. The synthetic resin part forms a series of shapes and is molded so that a part thereof forms a boss or rib shape. An opening part forming process for forming an opening part to the wood compressed in the compression process is further provided before the synthetic resin part forming process is performed, and, in the synthetic resin part forming process, the synthetic resin may be bonded and fixed at least to the peripheral edge part of the opening part formed in the opening part forming process. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a compressed wood product manufacturing method for manufacturing a compressed wood product comprising compression-molded wood.

  In recent years, natural wood has attracted attention. Since wood has various grain patterns, individual differences occur depending on the location of the raw wood, and the individual differences are the individuality of each product. In addition, scratches and changes in color caused by long-term use may also have a unique texture and may be familiar to the user. For these reasons, wood is attracting attention as a material that can produce unique and tasty products that are not found in products using synthetic resins (plastics) and light metals, and its processing technology is also making significant progress. .

  Conventionally, as a processing technique of such wood, after compressing a piece of water softened and softened, and slicing the wood substantially parallel to the compression direction to obtain a plate-like primary fixed product, this primary fixed product is heated and absorbed by water. There is known a technique of forming a predetermined three-dimensional shape while performing the process (for example, see Patent Document 1). There is also known a technique in which a piece of wood compressed in a softened state is temporarily fixed, and this wood is put into a mold and recovered to mold (for example, see Patent Document 2). In these techniques, the thickness and compression rate of wood are determined in consideration of various points including individual differences and types of wood, strength of wood after processing, and its use.

Japanese Patent No. 3078452 JP-A-11-77619

  However, in the above prior art, a strong portion and a weak portion may occur depending on the fiber direction of the wood depending on the shape of the wood after compression. In such a case, there is no choice but to reinforce the wood, which is a molded product, but there is a problem that it takes time and effort to attach a reinforcing member therefor.

  This invention is made in view of the above, Comprising: It aims at providing the manufacturing method of the compression wood product which can attach easily the reinforcement member which reinforces the compression molded wood with respect to the wood .

In order to solve the above-described problems and achieve the object, a compressed wood product manufacturing method according to the present invention is a compressed wood product manufacturing method for manufacturing a compressed wood product including compression-molded wood, wherein the wood is three-dimensionally shaped. A compression step for compression molding, and a synthetic resin portion having a predetermined shape on the surface of the wood by placing the wood compressed in the compression step in an injection mold and injection molding synthetic resin And a resin part forming step.

The method for manufacturing a compressed wood product according to the present invention is characterized in that, in the above invention, the synthetic resin portion has a series of shapes.

The compressed wood product manufacturing method according to the present invention is characterized in that, in the above invention, a part of the synthetic resin portion has a boss shape and / or a rib shape.

Method of manufacturing a compressed wood product according to the present invention, in the above invention, before performing the synthetic resin portion forming step, further comprising an opening forming step of forming an opening with respect to the wood compressed by the compression step The synthetic resin portion forming step is characterized in that the synthetic resin is adhered and fixed to at least a peripheral portion of the opening formed in the opening forming step.

In the above invention, the method for producing a compressed wood product according to the present invention further includes a roughening step of roughening a surface of the wood to which the synthetic resin adheres before performing the synthetic resin portion forming step. Features.

The method for producing a compressed wood product according to the present invention is characterized in that, in the above invention, the roughening step is performed simultaneously with the compression of the wood in the compression step.

The method for producing a compressed wood product according to the present invention is characterized in that, in the above invention, the compression step is to apply a compressive force by sandwiching the wood by a pair of molds in a steam atmosphere at a higher temperature and pressure than the atmosphere. To do.

  According to the method for manufacturing a compressed wood product according to the present invention, a compression process of compressing and molding wood into a three-dimensional shape, and placing the compressed wood in the compression process in an injection mold and injection molding a synthetic resin. A synthetic resin portion forming step of forming a synthetic resin portion having a predetermined shape on the surface of the wood, whereby a reinforcing member for reinforcing the compression-molded wood can be easily attached to the wood It becomes possible.

  The best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described below with reference to the accompanying drawings. In the method for manufacturing a compressed wood product according to an embodiment of the present invention, first, a wood having a predetermined shape is formed from a raw wood (a shaping step). FIG. 1 is a diagram schematically showing an outline of this shaping process. A wood 1 shown in FIG. 1 is formed by cutting or the like from an uncompressed solid wood 10 (having a grain 10G) that is a raw wood, and has a flat main plate portion 1a having a substantially rectangular surface, and the main plate portion. Two side plate portions 1b extending from each of two sides substantially parallel to the longitudinal direction of the surface 1a at a predetermined angle with respect to the surface of the main plate portion 1a, and 2 substantially parallel to the short direction of the surface of the main plate portion 1a And two side plate portions 1c extending from each of the sides at a predetermined angle with respect to the surface of the main plate portion 1a. The wood 1 has a dish shape (including a bowl shape, a shell shape, a box shape, and the like), and has a volume that is preliminarily added with a volume reduced by a compression process described later.

  In the case shown in FIG. 1, the shaping is performed so that the longitudinal direction of the wood 1 formed from the solid material 10 and the fiber direction L of the wood 1 are substantially parallel and the surface of the main plate portion 1a forms a grid surface. But this is just an example. In addition, the longitudinal direction of the wood 1 can be shaped so that the longitudinal direction of the wood 1 is substantially parallel to the fiber direction L of the wood 1 and the surface of the main plate portion 1a forms a plate surface and a tracking surface. Moreover, it can also be shaped so that the longitudinal direction of the wood 1 is substantially perpendicular to the fiber direction L of the wood 1 and the surface of the main plate portion 1a forms a mouth end surface. In this way, how the wood is shaped from the raw wood is determined according to conditions such as strength and aesthetics required for the wood. In view of such circumstances, in the drawings referred to in the following description, the description is omitted.

  In addition, the solid wood 10 is the most suitable for the use of processed wood from cypress, hiba, paulownia, pine, pine, cherry blossom, ebony, rosewood, bamboo, teak, mahogany, rosewood, etc. Should be selected. In addition, when taking wood from raw wood, it may be shaped like a flat plate.

  Next, the shaped wood 1 is compression-molded (compression process). FIG. 2 is a diagram showing a configuration of a mold used in this compression step and a state before the wood 1 is compressed. As shown in the figure, the wood 1 is sandwiched between a pair of molds 51 and 61, and a compressive force is applied. A mold 51 for applying a compressive force from above the wood 1 during compression includes a convex portion 52 that has a shape that rises from the main plate portion 1a of the wood 1 to the side plate portions 1b and 1c and fits to the curved inner surface. Core mold. Of the inner surface of the wood 1, when the curvature radius of the curved inner surface of the curved surface 1ab rising from the main plate portion 1a to the side plate portion 1b is RI and the curvature radius of the curved surface of the convex portion 52 contacting the curved surface 1ab is RA, These two radii of curvature satisfy the relationship RI> RA.

  On the other hand, the mold 61 for applying a compressive force from below the wood 1 during compression includes a concave portion 62 for fitting the curved outer surface rising from the main plate portion 1a of the wood 1 to the side plate portions 1b and 1c. Cavity mold. When the curvature radius of the curved curved surface 1ab outer surface rising from the main plate portion 1a to the side plate portion 1b of the wood 1 is RO, and the curved curvature radius of the concave portion 62 contacting the outer surface of the curved surface 1ab is RB. The radius of curvature satisfies the relationship RO> RB.

  Before compressing the wood 1 using the molds 51 and 61 having the above-described configuration, the wood 1 is left in a steam atmosphere having a temperature higher than that of the atmosphere for a predetermined time to absorb moisture excessively and soften it. . The high temperature and high pressure here means a temperature of 100 to 230 ° C., more preferably 180 to 230 ° C., still more preferably about 180 to 200 ° C., and a pressure of 0.1 to 3.0 MPa (megapascal), more preferably. Indicates a state of about 0.45 to 2.5 MPa, more preferably about 1.0 to 1.6 MPa. Instead of leaving the wood 1 to be softened in the water vapor atmosphere described above, for example, the wood 1 may be heated and softened by high-frequency electromagnetic waves such as microwaves.

  Thereafter, the wood 1 sufficiently softened in the above-described water vapor atmosphere is compressed in the same water vapor atmosphere. FIG. 3 shows that after the softened wood 1 is placed at a predetermined position, the mold 51 is lowered to sandwich the wood 1 with the mold 61, and a predetermined compressive force is applied to the sandwiched wood 1. It is a figure which shows the state which has added, More specifically, it is a figure which shows the state which the deformation | transformation by the compressive force of the timber 1 was completed substantially. As shown in FIG. 3, the wood 1 is deformed into a three-dimensional shape corresponding to the gap between the mold 51 and the mold 61 by receiving a compressive force from the molds 51 and 61.

  After applying a compressive force to the wood 1 for a predetermined time (1 to several tens of minutes, more preferably about 5 to 10 minutes), the wood 1 is dried by releasing the water vapor atmosphere, and the mold 51 and the mold 61 are separated. The compression process is completed by releasing the compression. As a result of this compression step, the thickness of the wood 1 is about 30 to 50% of the thickness of the wood 1 before compression. The wood after the compression process has a high strength even if it is thin, and the shape thereof is not deformed by drying of the wood or the like, and is suitable as an industrial product. Hereinafter, the wood after the compression process is referred to as “compressed wood”.

  In the present embodiment, after the compression step described above, an opening is formed by cutting or the like at a predetermined location of the compressed wood (opening formation step). FIG. 4 is a perspective view showing the configuration of the compressed wood after the opening forming step. The compressed wood 2 shown in the figure has a main plate portion 1a of the wood 1, a main plate portion 2a corresponding to the side plate portions 1b and 1c, and side plate portions 2b and 2c, respectively. In addition, a rectangular parallelepiped opening 21 is formed at the center of the main plate 2a. A compressed wood product manufactured using the compressed wood 2 having such an opening 21 is used as a cover member that forms part of an exterior material of a small digital camera, for example, and a liquid crystal panel is disposed in the opening 21. The In the following description, a case where a compressed wood product is manufactured using the compressed wood 2 will be described.

  Subsequently, a synthetic resin made of polycarbonate, ABS, polypropylene or the like is attached and fixed as a reinforcing member to the surface of the compressed wood 2 to form a synthetic resin portion having a predetermined shape (synthetic resin portion forming step). FIG. 5 is a view showing an outline of the synthetic resin portion forming step, and is a cross-sectional view showing a portion corresponding to the cross-sectional view taken along the line AA of the compressed wood 2 of FIG. In the case shown in FIG. 5, the compressed wood 2 is disposed at a predetermined position between the core mold 71 (injection mold) and the cavity mold 81 (injection mold). The core mold 71 is formed with a sprue 72 connected to a discharge nozzle provided at the lower end of the injection portion 101 for injecting the heat-melted synthetic resin. The sprue 72 is connected to spaces 78a, 78b, 78c and the like having the same shape as the molded portion, and has a flow path for injecting molten synthetic resin into the spaces including the spaces 78a to 78c. Eggplant.

  The injection mold (core mold 71 and cavity mold 81) having the above configuration is heated to a temperature of about 120 ° C., and then the synthetic resin heated and melted to about 300 ° C. is injected from the injection unit 101. Thus, the synthetic resin is injected into each space. After the injected synthetic resin is solidified, the core mold 71 and the cavity mold 81 are separated. At that time, the core mold 71 is raised with respect to the cavity mold 81 while the solidified synthetic resin is removed from the core mold 71 by the abutment pins 201.

  FIG. 6 is a perspective view showing a configuration of a compressed wood product completed through a synthetic resin portion forming step. 7 is a cross-sectional view taken along the line BB of FIG. 6, and this cut surface is the same cut surface as FIG. In the compressed wood product 3 shown in these drawings, bosses 32, 33, 34 and ribs 35, 36 are formed on the inner side surface of the main plate portion 2a of the compressed wood 2 as a part of the synthetic resin portion. These bosses and ribs have a series of shapes integrally connected via a connecting portion 30 (a part of the synthetic resin portion). The opening 31 is obtained by molding the surface of the opening 21 of the compressed wood 2 with the connecting portion 30. As apparent from a comparison of FIG. 7 with FIG. 5, the space portion 78 a corresponds to the boss 32, the space portion 78 b corresponds to the rib 35, and the space portion 78 c corresponds to the mold portion of the connecting portion 30. The mold part functions to prevent the synthetic resin part having a series of shapes from being detached from the compressed wood 2 via the connecting part 30.

  In this way, in the synthetic resin part forming step, by applying a normal injection molding technique to the compressed wood 2, the synthetic resin part as the reinforcing member is easily and reliably attached and fixed to the compressed wood 2. Can be made. Unlike the uncompressed wood, the compressed wood 2 has a fixed shape. For this reason, the reinforcement according to conditions, such as the shape of the compressed wood 2 and the fiber direction of the compressed wood 2, can be easily and accurately realized by forming the synthetic resin portion. The synthetic resin portion forming step is not limited to the above-described method, and from the general injection molding technology (including technologies related to outsert molding, insert molding, molding, etc.) What is necessary is just to select an optimal method according to conditions, such as a raw material, the shape of a reinforcement member, and a raw material.

  By the way, before the synthetic resin portion forming step described above, a roughening step is performed in which the surface of the compressed wood 2 to which the synthetic resin adheres is roughened by using a file or applying sandblasting. Also good. By performing this roughening step, the degree of adhesion of the synthetic resin to the compressed wood 2 can be further improved.

  In addition, you may roughen at least one part of the surface of the convex part 52 of the metal mold | die 51 used at a compression process previously by sandblasting. Thus, when a compression force is applied to the wood 1 using the mold 51, the surface shape (pattern) of the convex portion 52 including the roughened portion is transferred to the surface of the wood 1, so that the roughening is performed simultaneously with the compression step. It is possible to perform the surface process. In consideration of the fact that the roughening of the surface of the compressed wood 2 was performed in order to further improve the adhesion of the synthetic resin to be adhered and fixed later, the portion roughened on the surface of the convex portion 52 is compressed. Of the surface of the compressed wood 2 obtained by the process, it is only necessary to include at least a portion corresponding to a portion to which the synthetic resin adheres in the subsequent synthetic resin portion forming step.

  According to the method for manufacturing a compressed wood product according to the embodiment of the present invention described above, a compression process for compressing and molding wood into a three-dimensional shape, and the wood compressed in the compression process are arranged in an injection mold. A synthetic resin portion forming step of forming a synthetic resin portion having a predetermined shape on the surface of the wood by injection molding the synthetic resin, thereby providing a reinforcing member for reinforcing the compression molded wood It becomes possible to attach to easily.

  Moreover, according to this Embodiment, since the synthetic resin part is formed with respect to the compression-molded wood, wood itself does not deform | transform like the case where uncompressed wood is used. For this reason, there is no gap between the synthetic resin portion and the wood, and the synthetic resin portion is not taken off from the wood due to deformation of the wood.

  Furthermore, according to the present embodiment, the synthetic resin portion adhered and fixed to the compressed wood has a series of shapes, and a part thereof forms a boss shape or a rib shape, thereby appropriately reinforcing the compressed wood. It becomes possible to do.

  In addition, according to the present embodiment, the opening is formed, the peripheral portion of the opening is molded with the synthetic resin portion, and the formed synthetic resin portion has a series of shapes as described above. The synthetic resin part can be more securely fixed to the compressed wood.

  Compressed wood products manufactured by the compressed wood product manufacturing method according to the present embodiment include portable communication terminals such as digital cameras, mobile phones, PHS or PDAs, portable audio devices, IC recorders, portable televisions, and portable radios. It is suitable as an exterior material for small portable electronic devices such as remote controls for various home appliances and digital video. In this case, the exterior material may be configured by compression-molding another compressed wooden product having a dish shape similar to the compressed wooden product 3 having a dish shape and combining the two. And, for example, by forming bosses and ribs of the same shape on the compressed wood products at positions facing each other when two compressed wood products are combined, the electronic device is prevented from being deformed beyond a predetermined range by an external force. Is possible.

  Moreover, the compressed wood product manufactured by the compressed wood product manufacturing method according to the present embodiment can be applied as a glasses case or tableware.

  FIG. 8 is a cross-sectional view showing another configuration example of the compressed wood product formed by the compressed wood product manufacturing method according to the present embodiment. The compressed wood product 4 shown in the figure is formed such that a boss 41 and a rib 42 form a series of shapes via a connecting portion 40 on at least the illustrated cross section of the inner side surface of the compressed wood 22 having a dish shape. Among these, the boss 41 has a tapered shape that becomes wider as it goes to the base end portion on the connecting portion 40 side. By setting it as such a cross-sectional shape, the bigger reinforcement effect can be acquired. A rib having the same cross-sectional shape as the boss 41 may be formed. Moreover, the compression process of compression-molding the compressed wood 22 is the same as that in the above embodiment.

  The compressed wood 22 has no opening formed in the main plate portion 22a. Instead, a small-diameter opening 221 is formed in the compressed wood 22 in the thickness direction near the end surface of the side plate 22b in the opening forming step. For this reason, the synthetic resin portion forming step is performed in the same manner as in the above embodiment by using an injection mold in which the opening portion 221 is filled with the synthetic resin.

  In the compressed wood product 4 manufactured as described above, the connecting portion 40 is attached and fixed so as to connect the end surfaces separated from each other on the same cross section of the compressed wood 22, and the opening 221 is filled on the cross section. Since the synthetic resin portion is formed so that the synthetic resin and the synthetic resin attached and fixed to at least a part of the end surface of the side plate portion 22b of the compressed wood 22 form an annular shape, the synthetic resin portion is more It is possible to securely fix. In this sense, it is more preferable that the compressed wood product 4 has a plurality of cut surfaces having the cross-sectional shape shown in FIG. 8 because the strength in the vicinity of the end of the compressed wood 22 can be improved.

  In the description so far, the opening forming step for forming the opening in the compressed wood has been performed before the synthetic resin portion forming step. However, if the opening is unnecessary as a compressed wood product, You may advance to a synthetic resin part formation process, without performing an opening part formation process.

  As is clear from the above description, the present invention can include various embodiments and the like not described herein, and within the scope not departing from the technical idea specified by the claims. Various design changes and the like can be made.

It is a figure which shows the outline | summary of the shaping process in the manufacturing method of the compression wooden product which concerns on one embodiment of this invention. It is a figure which shows the outline | summary of the compression process in the manufacturing method of the compressed wooden product which concerns on one embodiment of this invention. It is a figure which shows the condition where the deformation | transformation of the timber was completed substantially in the compression process. It is a perspective view which shows the structural example of compressed wood. It is a figure which shows the outline | summary of the synthetic resin part formation process in the manufacturing method of the compressed wood product which concerns on one embodiment of this invention. It is a perspective view which shows the structure of the compression wood product manufactured by the manufacturing method of the compression wood product which concerns on one embodiment of this invention. It is the BB sectional view taken on the line of FIG. It is sectional drawing which shows another structural example of the compression wooden product manufactured by the manufacturing method of the compressed wooden product which concerns on one embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wood 1a, 2a, 22a Main plate part 1ab Curved surface 1b, 1c, 2b, 2c, 22b Side plate part 2, 22 Compressed wood 3, 4 Compressed wood product 10 Solid wood 10G Wood grain 21, 31, 221 Opening part 30, 40 Connection part ( Part of the synthetic resin part)
32, 33, 34, 41 Boss (part of synthetic resin part)
35, 36, 42 Rib (part of synthetic resin)
51, 61 Mold 52 Convex part 62 Concave part 71 Core mold (injection mold)
81 cavity mold (injection mold)
72 Sprue 78a, 78b, 78c Space part 101 Injection part 201 Butting pin

Claims (6)

A method for producing a compressed wood product, comprising producing a compressed wood product comprising compressed wood,
A compression process for compressing and molding wood into a three-dimensional shape;
An opening forming step of forming an opening near the end face of the wood compressed in the compression step;
A synthetic resin portion that forms a predetermined shape on the surface of the wood by placing the wood compressed in the compression step and forming the opening in the opening forming step in an injection mold and injection molding synthetic resin Forming a synthetic resin part,
I have a,
The synthetic resin part forming step includes:
The synthetic resin is attached and fixed to the wood so as to connect the separated end faces of the wood, and the opening formed in the opening forming step is filled with the synthetic resin so as to form a ring. A method for producing a compressed wood product, characterized in that a part is formed .   The method for manufacturing a compressed wood product according to claim 1, wherein the synthetic resin portion has a series of shapes.   The method for manufacturing a compressed wood product according to claim 1 or 2, wherein a part of the synthetic resin portion has a boss shape and / or a rib shape. Wherein prior to performing the synthetic resin portion forming step, in any one of claims 1-3, characterized in that it further comprises a roughening step of surface roughening of the wood the synthetic resin adheres A method for manufacturing compressed wood products. The said roughening process is performed simultaneously with compressing the said timber in the said compression process, The manufacturing method of the compressed wood product of Claim 4 characterized by the above-mentioned. The compressed wood product according to any one of claims 1 to 5 , wherein in the compression step, the wood is sandwiched between a pair of molds in a steam atmosphere at a higher temperature and higher pressure than the atmosphere. Manufacturing method.

Images