JPH03205108A - Inorganic plate having uneven pattern and production thereof - Google Patents

Abstract

PURPOSE:To form an uneven pattern distinct in outline on the surface by adding elastic granular bodies to the hydraulic inorganic material and forming the mixture into the green plate of a platelike body and pressing the surface by an uneven mold and hardening it. CONSTITUTION:Hydraulic inorganic material such as cement and slag is utilized as a main raw material. Granular bodies having elasticity which consist of the granular material of foamed plastic and foamed rubber are added to the hydraulic inorganic material at 0.1 - 10 wt.% and these are mixed. Fiber material is added in accordance with necessity. This mixture is formed into the green plate of a platelike body. A pressing device is utilized and the surface of the green plate is pressed by an uneven mold and embossing is performed. In this case, elastic granular material having water retentivity is mixed in the inside of the green plate and therefore when the green plate is pressed by the uneven mold, it is deformed. Retention water is squeezed and acts as a lubricant. Accordingly since fluidization is actively performed to the part except the pressing part, an uneven pattern distinct in outline can be formed on the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an inorganic board whose main raw material is a hydraulic inorganic material and a method for producing the same, and more particularly to an inorganic board having an uneven pattern and a method for producing the same.

<Prior art> Inorganic boards made mainly of hydraulic inorganic materials are used for the interior and exterior walls of houses, etc., but attempts have been made to improve the design by forming uneven or embossing patterns on their surfaces. A variety of things are being done.

For example, in JP-A-56-12447, after forming a hydraulic inorganic raw board by paper-making, lattice-like grooves with a depth of 0.5 to 3 mm are formed on the surface of the hydraulic inorganic raw board by pressing. A method of manufacturing an inorganic board having an uneven pattern by shaping and then curing has been proposed. Also, Unexamined Japanese Patent Publication No. 6
Publication No. 2-211105 l This method involves pressing a plate with a pattern engraved onto an uncured body of an extrusion molded body using a hydraulic substance as the main lubricant, and then separating the plate to remove the engraved pattern on the plate. A method has been proposed in which the pattern is transferred onto a cured molded product, thereby forming an uneven pattern on the extrusion molded product. All of these conventional methods are methods in which a desired uneven pattern is formed by pressing a press member having a shape matching the shape of the concave grooves to the uncured material, and a method using an F-Boss roll. Compared to the above, it is superior in that it has a clear uneven pattern with zero contours and does not cause undesired deformation of the product.

・Problems to be solved by the invention> However, in these conventional techniques, the concave groove portion that is densely formed due to the pressing force of the press member has a high specific gravity, and the specific gravity difference with other flat plate-like portions is high. is clearly demonstrated. Therefore, although the strength (bending strength) of the concave groove portion is improved, on the other hand, it becomes weak against impact and easily breaks. In addition, since the expansion and contraction characteristics due to water absorption, moisture absorption, and drying differ between the concave groove portion and the flat plate portion, the product is more likely to warp or sag. Furthermore, when applying paint to the surface to improve the design, the difference in specific gravity between the concave groove portion and the flat plate portion causes the paint to be sucked in differently, resulting in uneven color and gloss, resulting in an uneven finish. It has the disadvantage that it is difficult to achieve a perfect finish! two.

<Means for Solving the Problems> Therefore, the present invention solves the drawbacks of the prior art, and makes it possible to eliminate the disadvantages of the prior art by using a press member to form an uneven pattern. The purpose is to make the specific gravity of the concave groove portion substantially the same as that of the other flat plate portion.

In order to achieve this object, the present invention, which was created after intensive efforts, provides an inorganic plate having an uneven pattern on the surface due to pressure. This is an inorganic plate characterized in that the specific gravity of the concave portions and convex portions forming the concavo-convex pattern is substantially the same.

The present invention also relates to a method for manufacturing such an inorganic board, which includes using a hydraulic inorganic material as the main raw material, mixing particulate matter having an elasticity of 0.1% by weight or more and less than 10% by weight with respect to the main abrasive material, and further comprising: After adding an appropriate amount of water to make a kneaded product, the kneaded product is shaped into a plate-like raw board, and then the surface of the plate-like raw board is pressed with a concave-convex mold to form a mold, and is then cured and hardened. This is a method for manufacturing an inorganic board having an uneven pattern.

Effect〉 Elastic granules with water retention properties are mixed inside the plate-like raw board, so when this plate-like raw board is pressed with a concave-convex die, the elastic granules are deformed, and the inside of the raw board is deformed. The retained water is squeezed out and acts as a lubricant. At the same time, the granules are pressed and deformed: The granules try to return to their original shape due to their elasticity. Due to the function as a lubricant and the restoring pressure of the granules, the fluidity of the mixed material in the pressing section is improved, and the material flows actively to areas other than the pressing section. As a result, the specific gravity of the concave portions and the convex portions forming the concavo-convex pattern are substantially the same, and the overall specific gravity is made uniform.

Detailed explanation of the structure of the invention The kneaded material to be shaped into a plate-like raw board is mainly made of hydraulic inorganic materials such as cement, slag, carunium silicate, and gypsum. It is obtained by adding and mixing a suitable amount of water with granules having an elasticity of 0.1% to less than 10% by weight. The elastic granules include granules or crushed granules of foamed plastic or foamed rubber, and have water-retentive properties. Foamed plastics include polyvinyl chloride, polyethylene, polybropylene, ethylene-vinyl acetate copolymer resin, polystyrene, and polyurethane. AB
S resin, polyhinyl formal. acrylic resin. Examples include epoxy resin, phenol resin, and urea resin.

Examples of foamed rubber include natural rubber, synthetic rubber, and rubber latex. The granular material with this elasticity is 10
It is preferable that the foam has an expansion ratio of 60 to 60.

When obtaining a kneaded material, less than 35% by weight of a fibrous material can be further mixed with the main raw material. As the fibrous material, organic or inorganic fibers such as acrylic fibers, hiniron fibers, polypropylene fibers, carbon fibers, lath fibers, lonota wool, slag wool, asbestos, aramid fibers, nylon, and bulbs are used. In addition, for the kneaded material,
Furthermore, if necessary, add 1 slag, 1 silica sand, 7 calcium carbonate,
Increased amount of lyca, soriki flower, etc., reactive materials, melami).
Acrylic acid, methyl cellulose, polyethylene glycol. Mix reinforcing agents such as polypropylene glycol, water reducing agents, and lubricants.

The obtained kneaded material is shaped into a plate-like green plate having a desired thickness. Suitable forming methods include extrusion, Fourdrinier papermaking, casting, etc.For forming methods that involve entanglement of the fibrous material in the kneaded material, for example, circular mesh papermaking, it is preferable to Therefore, it is not possible to obtain a thick plate-like raw board, and since a large amount of fibrous material is required, it is difficult to form a sufficiently deep uneven pattern in the subsequent process, and furthermore, it is subject to press pressure. It is not preferable because it has drawbacks such as delamination which tends to occur when the film is heated.

The surface of the submerged plate-like raw board is pressed with a concave-convex mold using a press device to perform molding.

At this time, since elastic granules having water-retaining properties are mixed inside the green plate, they are deformed when pressed by the uneven press die, and the retained water is squeezed out to act as a lubricant.

Furthermore, the granular material that has been deformed by pressure attempts to restore its original shape due to its elasticity. Due to the function as a lubricant and the restoring pressure of the granules, the fluidity of the mixed material in the pressing part is improved, and the material flows actively to areas other than the pressing part. As a result, the specific gravity of the concave portions and convex portions forming the uneven pattern becomes substantially the same, and the overall specific gravity is made uniform.

In order to achieve the above effect, the mixing ratio of elastic particulates is important, and is 0. {weight% or more and 1
It is necessary that it be less than 0% by weight. If the amount of ungrooved mixture is 0.1% by weight, the internal water squeezed out during pressing will not function as a lubricant sufficiently, and the restoring pressure of the granules will also promote the flow of other mixed materials. It becomes insufficient. On the other hand, the amount of elastic particles mixed with the main raw material is 10% by weight.
If this happens, both the amount of water to be squeezed out and the restoring pressure will become excessive, causing excessive flow of the mixed material, resulting in an increase in the mixing ratio of granules in the convex parts of the uneven pattern, and the The restoring pressure of the granules forms minute irregularities on the surface of the convex portion.

As mentioned above, a fibrous material can be mixed into the kneaded material, but the mixing ratio is limited to less than 35% by weight.

This means that when 35% by weight or more of fibrous material is mixed in,
This is because the fluidity of the mixed material in the pressing part is suppressed by the entanglement of the fibers, so that the specific gravity of the concave part and the convex part cannot be made uniform.

The plate-like raw board, which has been formed with an uneven pattern on its surface by the uneven pressing die of the press machine, is put into a steam curing chamber for primary curing, and then put into an autoclave apparatus for second curing. An inorganic board is produced.

<Effects of the Invention> According to the present invention, an inorganic board can be obtained in which a concavo-convex pattern with a clear outline is formed on the surface using a press device, and the specific gravity of the concave portions and convex portions is made uniform. Suitable for use on internal and external walls, etc.

Claims (4)

[Claims] (1) An inorganic plate having an uneven pattern on its surface due to pressure, in which elastic granules are mixed in an amount of 0.1% by weight or more and less than 10% by weight based on the main raw material, and concave portions forming the uneven pattern; An inorganic board characterized by having convex portions having substantially the same specific gravity. (2) The inorganic board according to claim 1, further comprising less than 35% by weight of a fibrous material based on the main raw material. (3) A hydraulic inorganic material is used as the main raw material, granules having an elasticity of 0.1% by weight or more and less than 10% by weight are mixed with the main raw material, and an appropriate amount of water is further added to form a kneaded product. , the kneaded material is formed into a plate-like raw board, the surface of the plate-like raw board is then pressed with a concave-convex mold to form a mold, and then cured and hardened. Production method. (4) The method for manufacturing an inorganic board according to claim 3, characterized in that, when obtaining the kneaded material, a fibrous material is further mixed in an amount of less than 35% by weight based on the main raw material.