JPH0985718A - Manufacture of oriented board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the longitudinal bending strength and dimensional stability without cost with sufficient orienting effect by improving the slit board in the case of the mechanical orientation. SOLUTION: Adhesive coated rod-like wood chip 13 is dropped from above many wider wedge-shaped slit boards 10 having wider lower part than the upper part even in the interior and aligned, formed and mounted on a foaming belt 12. After the chip 13 are oriented in a predetermined direction and filled in the slit 11, it is lifted to the upper part to make the slit 11 vacant. Further, the adhesive coated rod-like wood chip 13 is similarly dropped, oriented in a predetermined direction and filled in the slit 11. The operation is repeated three to ten times in response to a desired thickness to obtain a foaming mat. Accordingly, since the orienting effect of the predetermined direction is sufficient, the performance similar to lumbering, longitudinal bending strength and dimensional stability are improved.

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 an oriented board in which rod-shaped wood chips such as particles are aligned in a certain direction.

[0002]

2. Description of the Related Art In the manufacture of particle boards, wood chips that are subdivided into small pieces
It is manufactured by applying a thermosetting resin of melamine co-condensation system, melamine system, or phenol system, forming and hot pressing into a plate shape from both sides. In addition, since the wood chip, which is a raw material for particleboard, is usually made of wood waste material as a main raw material, it is inexpensive and has uniform quality, and is therefore widely used for furniture and building members.

Conventionally, as a method for orienting a wood chip, there has been an electrical orientation method in which a high-voltage electrostatic field is generated to drop the wood chip from above, or a mechanical orientation in which the wood chip is dropped from between elongated slit disks.

[0004]

Among the conventional orientation methods, electrical orientation is large in terms of equipment, both initial cost and running cost are high, and since a high voltage is used, there is a human risk and it is difficult to put it into practical use. there were. In the case of mechanical orientation, when dropping between slitters, the wood chips are rod-shaped and tend to be vertical without being balanced in the longitudinal direction. Due to the inhomogeneity of the shape, the unidirectionality was apt to be lost, and the orientation effect was not always sufficient. The present invention has been made in view of such circumstances, and an object of the present invention is to improve a slit board in the case of mechanical orientation, and to provide a method for producing an orientation board which has a sufficient orientation effect and is inexpensive.

[0005]

[Means for Solving the Problems] A device having a large number of slit discs whose lower portion is wider than that of an upper portion is arranged inside is installed in a forming position, and a rod-shaped wood chip is uniformly filled in the slit in the same direction. Pull up the slit board. By repeating this operation a plurality of times, a predetermined amount of forming is performed to obtain a forming mat having a sufficient alignment effect. The mat is heat-pressed from both sides to be formed into a plate shape.

[0006]

In the method of manufacturing an orientation board according to the first aspect, a sufficient orientation effect can be obtained as compared with the orientation board manufactured by the conventional method. Further, since the effect of orienting in a fixed direction is sufficient, it has a performance similar to that of lumber, and improves bending strength in the longitudinal direction and dimensional stability.

[0007]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a perspective view in which a plurality of slit discs in which a lower portion is wider than an upper portion are arranged side by side according to an embodiment of the present invention, FIG. 2 is a sectional view thereof, and FIG. FIG. 6 is a cross-sectional view of a board oriented in a plane.

First, a wood waste material or the like is crushed by an ordinary means to obtain a rod-shaped wood chip. The size of the chip is about 0.5 to 4.0 mm in thickness and about 5 to 20 mm in length. 2-5 kg / m of urea-based, urea-melamine co-condensed, melamine-based, and phenol-based thermosetting resins as adhesives
Apply about 3 times.

As shown in FIG. 1, a plurality of wedge-shaped slit disks, each having a lower part wider than the upper part inside thereof, are formed on the forming belt, and then the stick-shaped wood chip chips coated with the adhesive are dropped. Let Regarding the size of the inside of the slit, the upper slit interval is about 5 to 10 mm, the lower interval is about 50 to 100 mm, and the height is 50 to
The size of the entire slit board is about 1 m to 2 m and the length is about 2 m to 6 m. After orienting and filling the slit in a certain direction, the slit is emptied by pulling it up. Further, as in the previous case, the stick-shaped wood chip chip coated with the adhesive is dropped to orient and fill the slit in a certain direction. This operation is repeated 3 to 10 times depending on the desired thickness to obtain a forming mat.

Then, the plate was heat-pressed from both sides.
In addition, the temperature is 150 to 170 ° C. and the pressure is 2
It is about 0 to 30 kgf / cm2.

As an example of a concrete test result, the bending strength was 134 kgf / cm 2 for the random board and 162 kgf / cm 2 for the oriented board, and it was confirmed that the strength in the longitudinal direction was improved. Regarding the dimensional change in water absorption, when the random board was expanded by 0.61%, the oriented board was expanded by only 0.34%, and dimensional stability was confirmed.

In the case of three-layer or five-layer cross-alignment, the entire slitting machine is rotated at an angle of 90 degrees and the forming is repeated. Rotate twice for three layers and four times for five layers.

[0013]

As is apparent from the above description, the method for manufacturing an orientation board according to the first aspect of the present invention has a sufficient orientation effect in a certain direction, so that it has a performance similar to that of lumber and a longitudinal direction. Bending strength and dimensional stability are improved.

[Brief description of drawings]

FIG. 1 is a perspective view in which a plurality of slit disks in which a lower portion is wider than an upper portion are arranged side by side in the inside according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a slit board in which a lower portion is wider than an upper portion according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of an orientation board obtained by a method of manufacturing an orientation board according to an embodiment of the present invention.

[Explanation of symbols]

 10 Wedge-shaped slitting machine 11 Inside slit 12 Forming belt 13 Stick-shaped wood chips with adhesive applied 14 Orientation board

Claims (2)

[Claims] 1. A wedge-shaped slitting machine, in which the lower part is wider than the upper part, is placed on the forming belt.
Next, a method for manufacturing an orientation board is characterized in that a rod-shaped piece of wood chips, such as particles, is dropped from the upper part of the chip to perform forming, and then the operation of removing the slit board upward is repeated a plurality of times. 2. The method for manufacturing an orientation board according to claim 1, wherein the three or five layers are cross-oriented.