JPH0839523A - Manufacture of woody formed product - Google Patents

Abstract

PURPOSE:To make one side face of a woody formed product surface suitable as a decorative one by smoothing. CONSTITUTION:A recovery mixture 11a consisting of a woody fiber and a binding agent which are supplied to a lower surface of a raw material aggregation 10a consisting of a woody raw material and the binding agent which contain a woody fiber and a woody powder by sucking with a suction carrier 22 from an upper surface of the raw material aggregation 10a is adsorbed. The raw material aggregation 10a to which the recovery mixture 10a is adsorbed is compressed to form a compressed layer 11b of the recovery mixture, which is integrated into a compressed layer 10b of the raw material aggregation. A lower surface of an obtained woody base material 12 comes to be an excellently decorative surface by smoothing. Further, the woody powder and the binding agent which are supplied to a lower surface of a base material body 10b are preferably a recovery material recovered from a process whenrein the woody base material 12 is manufactured.

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 wood-based molded product used as a wood-based base material for a vehicle door trim, a wood-based interior material, a base material for furniture or the like.

[0002]

2. Description of the Related Art As one type of wood-based molded product, a wood-based molding formed by compression-molding a material aggregate in which a binder is added to a wood-based material containing wood-based fibers and powders and uniformly mixed. There is a product, and this molded product is generally known by the name of hard board.

[0003]

By the way, in this type of wood-based molded article, a wood-based material such as wood-based long fibers or short fibers is used as a main raw material, and a binder is added to the same material and mixed to perform compression molding. Since it is manufactured by the above method, the obtained wood-based molded product has high mechanical strength and has sufficient strength as a base material for door trims, interior materials, and the like. However, in the wood-based molded product manufactured in this way, the exposure of the fibers on both sides is unavoidable, and it goes without saying that one side can be used as it is as the design surface, or the design of the laminated body with the skin material attached. Even when used as a surface, it was necessary to smooth the surface by cutting or the like. If a skin material is attached to form a laminate, a foamed sheet such as urethane is attached to one side of the molded product and then the skin material is applied to smooth the design surface of the wood-based molded product. Although it is possible to prevent the unevenness due to the fibers exposed on the surface of the molded product from being exposed even if the forming step is not performed, in this case, the step of forming the foamable sheet, and attaching the foamable sheet Processes are required, which causes inconveniences such as complication of the manufacturing process and increase of materials used.

[0004]

SUMMARY OF THE INVENTION Therefore, the present invention has been made to solve the above-mentioned problems, and one aspect of this type of wood-based molded article is
It is an object of the present invention to smooth the wood-based molded article without lowering its strength and to use it as a surface suitable for a design surface without using a separate member such as a foamed sheet.

[0005]

Means for Solving the Problems The method for producing a wood-based molded article of the present invention made to achieve the above object comprises a wood-based material containing a wood-based fiber and a wood-based powder and a binder. By sucking from the upper surface of the material aggregate, the wood-based powder and the binder supplied to the lower surface are adsorbed and then compressed to press the wood-based powder and the binder onto the material aggregate. Is characterized by. Then, it is preferable that at least the wood-based powder of the wood-based powder and the binder supplied to the lower surface of the material aggregate is a recovery material recovered from the step of manufacturing the wood-based molded product.

[0006]

In the method for producing a wood-based molded article of the present invention thus configured, since the material aggregate containing wood-based fibers is sucked from the upper surface,
A suction force that is drawn toward the inside of the material assembly acts on the holes on the lower surface. Therefore, when the wood-based powder is supplied to the lower surface together with the binder, the wood-based powder and the binder are adsorbed to the holes on the lower surface by the suction force. At this time, the larger the size of the holes formed on the lower surface, the stronger the suction force, and thus the more wood-based powder is adsorbed. Then, by compressing the material aggregate with the wood-based powder and the binder adsorbed, the wood-based powder and the binder were pressure-bonded to the material aggregate and were exposed on the lower surface of the material aggregate. Exposed fibers are removed and smoothed. The smoothed lower surface is suitable as a design surface having no unevenness, and becomes a wood-based molded product having an excellent appearance.

In particular, if the wood-based powder recovered from the step of manufacturing the wood-based molded product or the wood-based powder containing the binder is adopted as the wood-based powder to be adsorbed on the lower surface of the wood-based molded body, Not only can the wood powder and binder that have been discarded be reused, but there is no need to separately manufacture wood powder for adsorption, so effective use of materials and simplification of the manufacturing process can be achieved. It is effective in terms.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of manufacturing a wood base material for a door trim is adopted as an embodiment of the present invention, and its details will be described with reference to the drawings. FIG. 1 shows process diagrams of the method for manufacturing a wood-based substrate according to the example. In this manufacturing process, first, wood-based fibers and wood-based powder formed by defibrating wood chips are mainly used, and if necessary, various fibers or powders are mixed, and a phenol-based thermosetting resin is used. As shown in FIG. 1A, a predetermined amount of a raw material aggregate 10a, in which a resin (corresponding to the binder of the present invention) is uniformly mixed, is supplied to a laminated case 20 to be evenly piled up. Next, the material aggregate 10a that has been piled up is viewed from the top of FIG.
As shown in (b), it is suction-held by the suction-transport device 22. At this time, since the material aggregate 10a is sucked from the upper surface thereof, a suction force that is drawn toward the inside of the material aggregate 10a acts on the holes in the lower surface. Continued Figure 1
In the step shown in (c), the collected mixture 11a of the wood-based powder and the binder collected in the laminating step shown in FIG. 1 (a) is applied to the entire lower surface of the material aggregate 10a in the XY direction. By spraying with the movable spraying device 23, it is adsorbed to the holes on the lower surface of the material aggregate 10a. At this time, the larger the size of the hole formed on the lower surface is, the stronger the suction force is.
Are adsorbed. The recovered wood-based powder used for adsorption is a rod-shaped powder having a length of 1 to 3 mm and a thickness of 0.2 mm or less.
It is a fine powder that can fill the pores between the fibers that appear on the lower surface.

Subsequently, the material aggregate 10a is shown in FIG.
As shown in (d), the collected mixture 11 is formed on the entire lower surface.
a is conveyed while being suction-held and a pair of molding dies 24, 25
The material aggregate 10a is placed on the lower mold 24 of the mold and compressed between the two molds 24 and 25 (see FIG. 1 (e)).
The recovered mixture 11a and the recovered mixture 11a are bound with a binder to form the compressed layer 10b of the raw material aggregate and the compressed layer 11b of the recovered mixture, respectively, and at the same time, both layers 10b and 11b are firmly pressed and integrated. As a result, the exposed fibers are removed from the lower surface, and the wooden base material 12 composed of the compressed layer 11b of the recovered mixture and having a smooth surface with a surface roughness of about 40 to 50 μm is used.
(See FIG. 1 (f)) can be formed. The wood-based base material 12 for door trims thus obtained can be adhered to a skin material without interposing a foamable sheet such as urethane,
The door trim has an excellent design with no irregularities.

In the above embodiment, the material aggregate 10a
The wood-based powder and the binder to be adsorbed on are reused as the recovery mixture 11a of the wood-based powder and the binder, which is recovered from the stacking step of the material assembly 10a shown in FIG. 1 (a). Therefore, the materials can be effectively used, and the materials to be used can be reduced as a result. However, a separately produced binder-containing wood-based powder may be used. In addition, for example, only the wood-based powder that does not contain the binder recovered in the defibration step is reused, and the binder is added and mixed before the spraying step (see FIG. 1 (c)). Good.

In the embodiment shown in FIG. 1, the spraying device 23 of the XY direction movable type (FIG. 1) is used as a means for supplying the recovery mixture 11a composed of the woody powder and the binder to the lower surface of the raw material aggregate 10a. (See (c))
For example, as shown in FIGS. 2A, 2B, and 2C, the internal space of the container 30 is filled with a wood-based powder and a binder, and the upper surface of the raw material aggregate 10a is held by the suction conveyance device 31. The wood-based powder and the binder may be adsorbed to the lower surface of the same material aggregate 10a by passing through the container 30 as it is.

Instead of using the spraying device 23 shown in FIG. 1 (c), a plurality of air jets are blown into the open box 40 containing the recovery mixture 11a composed of the wood powder and the binder. A set of several blower pipes 41 having holes 41a are installed, the collected mixture 11a is blown upward by the air blown out from the blowout holes 41a, and the collected mixture 11a is held by the suction conveyance device 42. It can also be adsorbed on the lower surface of the body 10a.

Since the wood-based molded product manufactured by the manufacturing method of the present invention has a porous interior and surface, a molten resin serving as a skin material is supplied to the surface and molded between a pair of molding dies. This makes it possible to provide a laminate in which the skin materials are joined by the anchor effect.

[Brief description of drawings]

1A to 1F are process diagrams of a method for manufacturing a wood-based base material for door trim according to an embodiment of the method for manufacturing a wood-based molded product of the present invention.

2 (a) is a perspective view showing another embodiment of the spraying process shown in FIG. 1 (c), and FIG.
2C is a cross-sectional view taken perpendicularly to the insertion direction of the suction / conveyance device 31 of FIG. 2A in a state where the suction / conveyance device 31 is inserted into the container 30, and FIG.
FIG. 3 is a cross-sectional view of the suction conveyance device 31 taken along an axis parallel to the insertion direction in the same state as in FIG.

FIG. 3 is a schematic view showing another embodiment of the spraying process shown in FIG. 1 (c).

[Explanation of symbols]

10a ... material aggregate, 10b ... compressed layer of material aggregate, 1
1a ... Recovery mixture, 11b ... Compressed bed of recovery mixture, 12
... Wood-based material, 20 ... Laminated case, 24 ... Lower mold, 25 ...
Upper mold, 22, 31, 42 ... Suction and conveyance device, 23 ... Spraying device, 41 ... Blower pipe.

Claims (2)

[Claims] 1. A wood-based powder and a binder supplied to a lower surface of a material aggregate comprising a wood-based material containing a wood-based fiber and a wood-based powder and a binder, which is sucked from the upper surface thereof. A method for producing a wood-based molded article, characterized in that the wood-based powder and the binder are pressure-bonded to the raw material aggregate after being adsorbed and then compressed. 2. At least a wood-based powder of a wood-based powder and a binder supplied to the lower surface of the material aggregate is at least a wood-based powder and a binder recovered from the step of manufacturing the wood-based molded product. It is a wood-based powder, The manufacturing method of the wood-based molded article of Claim 1 characterized by the above-mentioned.