JPH0637043B2 - Molded body manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a method for producing a molded product such as a wood chip cement board.

[Prior Art] Conventionally, a molded article having a groove pattern such as a wood chip cement board has been widely used as a building wall material and the like.

The above-mentioned molded article is, for example, disclosed in JP-A-58-114907 and JP-A-
As described in JP-A-60-54808, a non-fluid material obtained by mixing cement, wood chips flakes, water, etc. is put on the molding surface of a template having an uneven portion for groove pattern molding, It is formed by compressing the above material on the plate with a pressing machine.

[Problems to be Solved by the Invention] However, in the above-mentioned conventional method for producing a molded body, after spreading the above-mentioned material on the entire molding surface of the template at a substantially uniform development density, a press machine is used. It is compressed. Therefore, the compression rate (thickness before compression / thickness after compression) applied by the press with the material developed in the concave portion of the template (the portion that will form the convex portion of the molded body) is small, Material developed on the convex portion of the plate (the portion that will form the concave portion of the molded body)
However, the compression rate applied by a press tends to increase.

Therefore, looking at the pressure density and strength of each part of the molded body after compression molding, the convex portion of the molded body had low pressure density and low strength because the compressibility during molding was small, and the concave portion of the molded body was Since the compressibility was high, there was a tendency for high pressure density and high strength, and it was difficult to make the strength of the molded product having a groove pattern uniform.

Further, when the pressure of the press is increased in order to secure high strength in the convex portion of the molded body, the molding pressure in the concave portion of the molded body, that is, the convex portion of the template becomes excessive. That is, there is a possibility that the press machine becomes large and the press machine and the template are damaged.

An object of the present invention is to make it possible to easily mold a molded product having a groove pattern with uniform strength.

[Means for Solving Problems] In the present invention, a non-fluid material is put on a molding surface of a template provided with an uneven portion for forming a groove pattern, and the above material on the template is put into a press machine. In the method of manufacturing a molded product, in which a molded product having a groove pattern is formed by compressing with a material having different compression ratios, and a material having a small compression ratio is used for a large depth of the recess on the template. Then, a material having a high compressibility is introduced into a portion having a small depth on the template.

[Operation] According to the present invention, the material developed in the concave portion of the template (the portion that will form the convex portion of the molded body) that tends to have a low compression rate at the time of molding by the press machine is its own. The compression rate is said to be small from the beginning. On the other hand, the material developed on the convex portion of the template (the portion that will form the concave portion of the molded body), which tends to have a high compression rate at the time of molding by the press machine, increases its compression rate from the beginning. Has been done. As a result, the pressure densities formed by the pressing machine on the respective parts of the template become substantially equal to each other.

For this reason, the compact density of the obtained molded product and thus the strength are uniform in each part, and since the molding pressure of the molded product does not become excessively large, the press machine does not increase in size and damage to the press machine and the template is prevented. It will never happen. That is, a molded product having a groove pattern can be easily molded with uniform strength.

[Examples] FIG. 1 is a schematic diagram showing an example of the present invention, FIG. 2 is a schematic diagram showing an example of a material supply facility used for implementing the present invention, and FIG. 3 is used for implementing the present invention. It is a schematic diagram which shows an example of the press machine used.

In this example, a hard wood chip cement board (molded body) having a groove pattern is molded, and a non-fluid material is put on the molding surface of the template 1 by the material supply facility 10 (see FIG. 2). The material is compressed by the press machine 20 and heat-molded (see FIG. 3) to manufacture the molded body 2.

Here, the template 1 has a concave portion 1A and a convex portion 1 for forming a groove pattern.
It is equipped with B and 1C. The concave portion 1A becomes a convex portion of the molded body 2, and the convex portions 1B and 1C become a concave portion of the molded body 2.

Further, the material 3 of the molded body 2 is formed by mixing the cement composition as the curable material, the wood flakes as the reinforcing material, and water. The cement composition preferably contains Portland cement, alumina cement, anhydrous gypsum and / or hemihydrate gypsum.

The material supply facility 10 is, as shown in FIG.
Is installed above the template conveyer 11 that conveys the material, and the mixer 12 that mixes the above-mentioned raw materials at a predetermined ratio to make the material, the feed conveyor 13 that transfers the material from the mixer 12, and the feed conveyor 13 sends the material. It is composed of a slat conveyor 14 for quantifying the material, a leveling conveyor 15, and a brush 16 for spreading the quantified material from the supply conveyor 13 on the molding surface of the template 1 in a scattered manner.

Further, as shown in FIG. 3, the pressing machine 20 includes a template 1, a material 3 developed on the molding surface of the template 1, and a hot plate 4 attached to the lower surface of the template 1. One set is formed, and a large number of sets are packed and stacked between the upper and lower press portions 21. As a result, the material 3 is heated and pressed on the molding surface of the template 1 and then left at room temperature to be hardened to become a molded body 2 having a groove pattern.

In this embodiment, however, the material 3 is put into the molding surface of the template 1 after being adjusted as described below, and then subjected to the compression process by the press 20.

That is, the material supply zone of the material supply facility 10 is divided in the width direction of the template 1, and materials 3A, 3B, 3C, ... Having different compressibility are prepared for each material supply zone.

A fine powder material having a small compressibility (compressibility of 1.5 to 2) is put into a portion of the template 1 having a large recess depth (recess 1A).
A flake material (compression rate 3 to 4) having a large compression rate and a length of each piece of 30 to 20 mm is placed in a portion of the template 1 having a small depth (convex portion 1B). The medium length of the concave portion of the template 1 (convex portion 1C) has a medium compressibility and each piece length is 20
A flake material (compressibility 2 to 2.5) having a size of mm or less is charged (see FIG. 1 (A)).

It is compressed and formed by the press machine 20 (see FIG. 1 (B)).

Therefore, the material developed in the concave portion 1A of the template 1 (the portion that will form the convex portion of the molded body 2), which tends to have a low compression rate at the time of molding by the press 20, has its own compression rate. It is considered small from the beginning. On the other hand, the convex portion 1 of the template 1 which tends to have a high compression rate during molding by the press 20.
The material developed in B (the portion forming the concave portion of the molded body 2) has a high compression rate from the beginning.
As a result, the press densities formed by the press 20 on the respective parts of the template 1 become substantially equal to each other.

For this reason, the compacted density of the obtained molded body 2 and thus the strength becomes uniform in each part, and the molding pressure of the molded body 2 does not become excessively large locally, so that the press machine 20 does not become large, and the press machine 20 and the mold The plate 1 is not damaged.
That is, the molded body 2 having a groove pattern can be easily molded with uniform strength.

In the practice of the present invention, after obtaining a molded body having a uniform pressure density as shown in FIG. 1 (B), a core layer material having a constant thickness is spread on the outer layer portion of the molded body and compression molded. You may add especially.

[Effects of the Invention] As described above, according to the present invention, a molded article having a groove pattern can be easily molded with uniform strength.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is a schematic diagram showing an example of a material supply facility used to carry out the present invention, and FIG. 3 is a press machine used to carry out the present invention. It is a schematic diagram which shows an example. 1 ... template, 1A ... concave part, 1B, 1C ... convex part, 2 ... molded body, 3 ... material, 20 ... press machine.

Claims (3)

[Claims] 1. A groove pattern is formed by introducing a non-fluid material onto a molding surface of a template having an uneven portion for forming a groove pattern and compressing the material on the template with a press machine. In the method of manufacturing a molded body, in which a material having a different compression rate is prepared, a material having a low compression rate is put in a portion having a large depth of the recess on the template to reduce the depth of the recess on the template. A method for producing a molded product, characterized in that a material having a high compression rate is charged into a portion having a small thickness. 2. The method for producing a molded article according to claim 1, wherein the non-fluid material is a mixture of a curable material and a reinforcing material. 3. A method for producing a molded article according to claim 2, wherein the curable material is a cement composition and the reinforcing material is wood flakes.