JPH0832414B2 - Inorganic plate having uneven pattern and method for producing the same - Google Patents

Description

TECHNICAL FIELD The present invention relates to an inorganic plate containing a hydraulic inorganic material as a main raw material and a method for producing the same, and more particularly to an inorganic plate having an uneven pattern and a method for producing the same.

<Prior art> Inorganic plates made mainly of hydraulic inorganic materials are used for inner and outer walls of houses, and various attempts have been made to improve the design by forming an uneven pattern or an embossed pattern on the surface. It has been done.

For example, in JP-A-56-12447, after forming a hydraulic inorganic raw plate by paper making, a grid-like groove having a depth of 0.5 to 3 mm is formed on the surface of the hydraulic inorganic raw plate by pressing, followed by curing. By doing so, a method for producing an inorganic plate having an uneven pattern has been proposed. Also, JP-A-62-111105
Japanese Patent Laid-Open Publication No. 2003-242242 discloses a method of transferring an engraved pattern of a plate to an uncured molded body by pressing a plate engraved with a pattern on an uncured molded body of an extruded product containing a hydraulic material as a main material and then releasing the plate. A method of forming a concavo-convex pattern on the extruded body has been proposed. Each of these conventional methods is a method of forming a desired concavo-convex pattern by pressing a press member having a shape matching the shape of a groove to be formed on an uncured body, and a method using an emboss roll. Compared to,
It is excellent in that a sharp uneven pattern with a sharp outline is formed and undesired deformation does not occur in the product.

<Problems to be Solved by the Invention> However, in these conventional technologies, the concave grooves formed densely by receiving the pressing force of the press member have a high specific gravity, and the specific gravity difference from other flat plate-shaped portions is remarkable. Be demonstrated. For this reason, the strength (bending strength)
Is improved, but on the other hand it is weak against impact and easily cracked. Further, since the expansion / contraction characteristics due to water absorption, moisture absorption, and drying are different between the concave groove portion and the flat plate portion, the product is likely to be warped or twisted. Furthermore, when coating the surface to improve the design, the suction of the paint is different due to the difference in specific gravity between the concave groove portion and the flat plate portion, and uneven color and gloss are generated, resulting in a uniform However, it has a drawback that it is difficult to finish.

<Means for Solving the Problems> Therefore, the present invention aims to solve the above-mentioned drawbacks of the prior art and to provide a novel inorganic plate capable of adding a fresh surface shape and a method for producing the same. And

The present invention, which was devised after earnest efforts to achieve such an object, is an inorganic plate having an uneven pattern due to pressing on the surface, and the granular material having elasticity is 10 to 25 relative to the main raw material.
The inorganic plate is characterized in that it is mixed by weight% and has a large number of fine granular projections formed by the restoration of the granular material at the time of decompression on the convex portion forming the concave-convex pattern.

Further, the present invention uses a hydraulic inorganic material as a main raw material, and mixes a granular material having elasticity of 10 to 25% by weight with respect to the main raw material, and further adds an appropriate amount of water to obtain a kneaded product, and then the kneading By molding the product into a plate-shaped green plate, then pressing the surface of the plate-shaped green plate with a concave-convex die to mold and causing a corresponding portion of the granular material to flow to the convex side, and then decompressing In the method for producing an inorganic plate having an uneven pattern, which is characterized in that the granular material residing on the convex side is restored by its elasticity to form a large number of fine granular projections on the convex surface and post-curing is performed. is there.

<Operation> Since the elastic granular material having water retention property is mixed in the inside of the plate-shaped raw plate, the elastic granular substance is deformed when the plate-shaped raw plate is pressed by the concave-convex die, and the internal retention Water is squeezed out and acts as a lubricant. At the same time, the granular material that is pressed and deformed tries to restore to its original shape due to its elasticity. Due to the function as a lubricant and the restoration pressure of the particulate matter, the fluidity of the mixed material in the pressing portion is improved, and the flow to the area other than the pressing portion is actively performed. As a result, the corresponding portion of the granular material itself is also moved to the convex portion side forming the concave-convex pattern.
The elastic granular material, which is contained in a considerable amount on the convex side, is restored when the pressure is released, and a large number of fine granular projections are formed on the convex surface.

<Detailed Description of Configuration of the Invention> The kneaded product formed into a plate-like green plate is mainly composed of a hydraulic inorganic material such as cement, slag, calcium silicate, and gypsum, and 10 to 10 It is obtained by adding and mixing a granular material having elasticity of 25% by weight and an appropriate amount of water. The granular material having elasticity is a granular material such as foamed plastic, foamed rubber or crushed granules having water retention property. Polyvinyl chloride, polyethylene,
Polypropylene, ethylene-vinyl acetate copolymer resin, polystyrene, polyurethane, ABS resin, polyvinyl formal, acrylic resin, epoxy resin, phenol resin,
An example is urea resin. Examples of the foam rubber include natural rubber, synthetic rubber, rubber latex and the like. It is preferable that the elastic granular material has a foaming ratio of 10 to 60.

When obtaining the kneaded material, a fibrous material of less than 35% by weight based on the main raw material can be further mixed. As the fibrous material, organic or inorganic fibers such as acrylic fiber, vinylon fiber, polypropylene fiber, carbon fiber, glass fiber, rock wool, slag wool, asbestos, aramid fiber, nylon and pulp are used. Further, the kneaded product may further contain slag, silica sand, calcium carbonate, silica, silica flour, etc., if necessary, a reactive material, melamine, acrylic, methyl cellulose, polyethylene glycol,
A reinforcing agent such as polypropylene glycol, a water reducing agent, and a lubricant are mixed.

The obtained kneaded material is formed into a plate-like green plate having a desired thickness. As the molding method, an extrusion molding method, a fourdrinier papermaking method, a pouring method, etc. are officially known, and a molding method by the entanglement of the fibrous material in the kneaded product, for example, in the round-net papermaking method, because of paper making, Since it is not possible to obtain a thick green plate and it is necessary to use a large amount of fibrous material, it becomes difficult to form a sufficiently deep uneven pattern in the subsequent process. It is not preferable because it has a defect that peeling easily occurs.

The resulting plate-like green plate is pressed by using a pressing device with a concave and convex pressing die to perform molding. At this time, since elastic granular materials having water retention capacity are mixed inside the plate-like green plate, when it is pressed by the concave-convex die, it flows with other mixed materials and the convex portions in the concave-convex pattern are flown. Move to the side. Further, since the granular material has elasticity and water retention property, it is deformed by being pressed by the concave and convex die, the retained water is squeezed out and acts as a lubricant, and the elastically deformed granular material tries to restore to its original shape. To do. The function of the lubricant and the restoring pressure of the particulate matter promote the flow of the mixed material, so that the concave portions can be formed smoothly. Furthermore,
As a result of such flow, the mixing ratio of the particulate matter becomes high in the convex portion, so that when the pressure is released from the pressing device, a large number of fine granular projections are formed on the surface of the convex portion due to the restoring force of the elastic granular material. Becomes In particular, when the surface of the convex portion of the plate material is separated from the concave-convex mold during decompression, the restoring force of the elastic granular material acts at once to form fine granular projections on the surface of the convex portion.

In order to exert the above-described effects, the mixing ratio of the elastic granular material is important in the present invention, and it is necessary that the mixing ratio is 10 to 25% by weight with respect to the main raw material. If the mixed amount is less than 10% by weight, the mixed material will flow to the convex side, but since the amount of particulate matter in the convex part is too small, the restoring force due to elasticity will not be fully exerted, and When pressure is applied, fine granular projections cannot be formed over the entire surface of the convex portion. On the other hand, if the particulate matter exceeds 25% by weight, the amount of the particulate matter in the convex portion becomes excessive, and fine granular projections are formed not only on the surface of the convex portion but also on the side surface of the convex portion at the time of decompression or thereafter. There is a tendency that the outline of the pattern becomes unclear.

As described above, a fibrous material can be mixed into the kneaded material, but the mixing ratio is limited to less than 35% by weight.
This is because when fibrous material of 35% by weight or more is mixed, the fluidity of the mixed material in the pressing portion is suppressed by the entanglement of fibers, so that the specific gravity of the concave portion becomes significantly higher than that of the convex portion. This is because the problems in the prior art are revealed.

A plate-shaped raw plate having a surface uneven pattern formed by the concave-convex die of the pressing device and a large number of fine granular projections formed on the surface of the convex portion by the restoring force of the elastic granular material is put into the steam curing chamber and primary After curing, the inorganic plate of the present invention is manufactured by introducing it into an autoclave device and secondary curing.

<Effects of the Invention> According to the present invention, an inorganic material having a novel surface design in which a concavo-convex pattern with a sharp contour is formed on the surface by using a pressing device and a large number of fine granular projections are formed on the convex surface A plate can be obtained and is suitably used for the inside and outside walls of a house.

Claims (4)

[Claims] 1. An inorganic plate having an uneven pattern due to pressing on a surface thereof, wherein the granular material having elasticity is 10 to 10% with respect to the main raw material.
An inorganic plate characterized by being mixed with 25% by weight and having a large number of fine granular projections formed by the restoration of the granular material upon decompression on the convex portion forming the uneven pattern. 2. The inorganic plate according to claim 1, further comprising less than 35% by weight of a fibrous material mixed with the main raw material. 3. A hydraulic inorganic material as a main raw material, a granular material having elasticity of 10 to 25% by weight with respect to the main raw material is mixed, and an appropriate amount of water is further added to form a kneaded product, and then the kneading is carried out. By molding the product into a plate-shaped green plate, then pressing the surface of the plate-shaped green plate with a concave-convex die to mold and causing a corresponding portion of the granular material to flow to the convex side, and then decompressing A method for producing an inorganic plate having a concavo-convex pattern, characterized in that the granular material existing on the convex portion side is restored by its elasticity to form a large number of fine granular projections on the surface of the convex portion and post-curing and curing. 4. The method for producing an inorganic plate according to claim 3, wherein when the kneaded product is obtained, less than 35% by weight of a fibrous material is mixed with the main raw material.