JPH06190818A - Manufacture of projected and recessed patterned fiber reinforced inorganic plate - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to provide a deep engraved pattern on the surface of an uncured fiber-reinforced inorganic plate material that is difficult to press. [Structure] On the surface of a fiber-reinforced inorganic plate formed in a plate shape, a cement mixture layer containing a large amount of C ₂ S finely pulverized to an average particle size of 5 to 10 μm as a main component is formed, and the layer is formed. It consists of a pressing process, and the surface compound layer enables deep engraving and uneven patterning.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fiber-reinforced inorganic plate having an uneven pattern.

[0002]

2. Description of the Related Art Conventionally, a fiber-reinforced inorganic board mainly composed of cement has been widely used as a building material. These fiber-reinforced inorganic boards have the advantage that they can be provided with an arbitrary uneven pattern by pressing on the surface, and that building boards with various designs can be mass-produced.

[0003]

However, when a plate-like body is formed by, for example, an extrusion molding method, it is difficult to form a deep concave-convex pattern by pressing because these molded products have poor fluidity of the material immediately after the molding. There was a drawback in that the material cracked when pressed with a high pressure. Also, in extrusion molding, the material is compressed under high pressure and extruded, so the specific gravity of the product tends to be high, and in order to reduce the weight, a large amount of organic or inorganic foam aggregate is used. The extrusion-molded product containing the aggregate has a low shape-retaining property, and therefore, there is a problem that the product shape itself is impaired by high-pressure pressing.

Further, in the papermaking method, a large amount of reinforcing fibers are contained in the material mixture, and the fibers are likely to be exposed on the surface of the base material to easily cause fluffing. For this reason, a deeply uneven pattern of carving or fine pattern unevenness is produced. There was a drawback that the pattern was hard to attach. Further, the plate material obtained by the papermaking method has a low water content, and thus there is a problem that it is difficult to form an uneven pattern by pressing.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides an uneven pattern on a surface of an uncured fiber-reinforced inorganic plate material, which is difficult to be provided with a deep engraved pattern by pressing, without deforming it. The present invention has been made for the purpose of providing a method for producing a fiber-reinforced inorganic plate having an uneven pattern.

[0006]

Means for Solving the Problems That is, the method for producing a fiber-reinforced inorganic plate with a concavo-convex pattern of the present invention is such that the surface of a fiber-reinforced inorganic plate molded in a plate shape is finely pulverized to an average particle size of 5 to 10 μm The present invention is characterized in that a cement mixture layer containing cement containing a large amount of C ₂ S as a main component is formed and the layer is pressed.

[0007]

As described above, it is difficult to form a concavo-convex pattern on the surface of a molded article formed by extrusion molding or papermaking by pressing. Therefore, a cement mixture layer made of cement containing a large amount of C ₂ S is newly formed on the surface of the plate material obtained by these forming methods, and this is pressed.

The C ₂ S-rich cement is a cement composed of the components shown in the following cement composition table, such as moderate heat Portland cement, and has higher strength than ordinary C ₃ S-rich Portland cement. Cement composition Cement type C ₃ SC ₂ SC ₃ AC ₄ AF Normal Portland cement 50 25 9 9 Moderate heat Portland cement 42 36 3 12

Also, the drying shrinkage is small and the release of calcium hydroxide is small as shown by the following equation. C ₃ S: 2Ca ₃ Si0 ₅ ＋ 6H ₂ O → Ca ₃ Si0 ₃ O ₇ ＋ 3H ₂ O ＋ 3Ca (OH) ₂ C ₂ S: 2Ca ₂ Si0 ₄ ＋ 4H ₂ O → Ca ₃ Si0 ₃ O ₇ ＋ 3H ₂ O ＋ Ca (OH) ₂

Further, the average particle size of this cement is 5 to
The reason for finely pulverizing to 10 μ is to make the tissue dense and hard. Therefore, even if the inorganic plate serving as the base material is difficult to be uneven by pressing, it is possible to provide a deeply engraved and fine uneven pattern by this surface layer. Furthermore, since a fine structure can be obtained, mirror finishing by polishing is also possible.

[0011]

Embodiments of the present invention will be described below.

(Example 1) 50-80 parts by weight of medium heat Portland cement finely pulverized to an average particle size of 5-10 μ, pigment 10
~ 20 parts by weight, 10 to 30 parts of aggregate, add a water reducing agent and water and knead to prepare a cement slurry having a solid content concentration of 40%,
This slurry was supplied in layers on the surface of a plate material obtained by extrusion so as to have a thickness of 3 mm, and a wood grain uneven pattern with a maximum unevenness difference of 2 mm was pressed from above the layer at a pressure of 120 kg / cm ² .

(Example 2) On the surface of the fiber-reinforced inorganic plate obtained by the paper-making method, the slurry was applied in layers as in Example 1 and patterned by pressing similarly.

COMPARATIVE EXAMPLE 1 The surface of the extruded plate used in Example 1 was directly pressed under the same conditions as in Example 1. (Comparative Example 2) The surface of the plate-like body produced by the papermaking method used in Example 2 was directly pressed under the same conditions as in Example 1.

In Examples 1 and 2, it was observed that the concave and convex pattern formed by pressing was very sharp, but in Comparative Example 1, cracks were generated at the edges of the plate material. Was observed, and in Comparative Example 2, the boundaries of the irregularities were not sufficient, and only irregular patterns with a dim appearance could be formed.

The molded articles of Examples 1 and 2 and Comparative Examples 1 and 2 were cured by an autoclave and the surface of the plate material was observed. When the surface was polished, it was possible to finish the example with a smooth surface close to a mirror surface, but with the comparative example, the surface was abraded, and the disappearance of the convex portion of the pattern was observed.

[0017]

As described above, according to the present invention, the surface of the uncured inorganic plate material, which has conventionally been difficult to be patterned by pressing, can be easily provided with a deep concave-convex pattern, and constitutes a surface layer. Cement containing a large amount of C ₂ S is used as the cement layer, so the strength is superior to that of ordinary Portland cement, and the drying shrinkage is small and the release of calcium hydroxide is small, so a beautiful surface layer is obtained and the surface texture is dense. It has various effects such as polishing finishing and the like, and reinforcement of the base material can be expected.

Claims (1)

[Claims] 1. A cement mixture layer containing as a main component a cement containing a large amount of C ₂ S finely pulverized to an average particle size of 5 to 10 μm is formed on the surface of a plate-shaped fiber reinforced inorganic plate, A method for producing a fiber-reinforced inorganic plate having an uneven pattern, which comprises pressing a layer.