JPH05261717A - Production of lightweight cement panel - Google Patents

Abstract

PURPOSE:To enhance the appearance designing effect without producing dust by a method wherein water is sprinkled over the surface of a molded lightweight cement panel to be absorbed into the cement panel and blast treatment is applied to this panel to expose decorative aggregate to the surface of the panel. CONSTITUTION:Water 2 is sprinkled over the surface part of a molded lightweight cement panel 1 to be absorbed into the cement panel 1 to bring the cement panel 1 to a wet state. Subsequently, sands or shorts 3 are sprayed on the surface of the cement panel 1 to apply blast treatment thereto and the water absorbed layer of the cement panel in a wet state is roughened. At this time, blast treatment is repeated until the dry layer under the water absorbed layer is exposed. By this constitution, the decorative arrange 4 present in the surface layer of the lightweight cement panel 1 is exposed to make the appearance designing effect of the cement panel excellent. Since blast treatment is applied is a wet state, the production of dust can be suppressed.

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 a lightweight cement board. More specifically, the present invention relates to a method for manufacturing a lightweight cement board, which can easily and easily manufacture a lightweight cement board having a material appearance, a texture and the like and excellent in appearance design.

[0002]

2. Description of the Related Art Conventionally, a lightweight cement board has been used as a building material such as an outer wall of a house or an outer member. This lightweight cement board is mainly manufactured by a casting method that can obtain a good design, and in cast molding, the design is given by a pattern pattern arranged in a mold.

However, the lightweight cement board produced by the casting method usually has a problem that a cement-rich skin layer is formed on the surface thereof and the mixed aggregate does not appear on the surface. Therefore, conventionally, in order to improve the appearance and design of the material such as texture and texture, the surface of the cement board is painted after molding, or surface materials such as tiles and stones are arranged. Also, with respect to decorative concrete blocks, decorative concrete flooring materials, etc., various surface treatments are performed after molding, and the decorative aggregate existing in the surface layer of the cement product is exposed on the surface.

As such a surface treatment, for example, as shown in FIG. 2, washing out or polishing after cast molding using a decorative aggregate, and granules as shown in FIG. The hitting out and the blasting of spraying on the part have been known so far.

[0005]

However, the conventional method for manufacturing a lightweight cement board which carries out various kinds of surface treatments as shown in FIGS. 2 and 3, for example, requires a considerable amount of surface treatment. There is a basic problem that it takes time and work efficiency is low. In addition, in the case of washing out and polishing, there is a drawback that the size of the lightweight cement board is apt to be restricted because the surface work is conventionally performed. In the case of tapping or blasting, dust is generated, which poses a problem in the working environment, and the fact is that it is used only in some limited cement products.

On the other hand, these surface treatments have attracted attention and have been reviewed as a method for improving the appearance and design of cement boards, and recently, various methods have been combined to produce lightweight cement boards. Are also beginning to do. This invention has been made in view of the circumstances as described above, eliminates the drawbacks of the conventional method for manufacturing a lightweight cement board, and easily provides a lightweight cement board with an excellent appearance design having a texture and a texture. It is an object of the present invention to provide an improved method for manufacturing a lightweight cement board that can be easily manufactured.

[0007]

In order to solve the above-mentioned problems, the present invention is characterized by spraying water on the surface portion of a molded lightweight cement board, absorbing water, and then blasting. A method for manufacturing a cement board is provided.
Further, in the present invention, it is also one of the preferable embodiments to repeat the water sprinkling and the blast treatment a plurality of times.

[0008]

[Operation] In the method for manufacturing a lightweight cement board of the present invention, water is sprayed on the surface of the molded lightweight cement board,
By blasting after absorbing water, it is possible to effectively expose the decorative aggregate to the surface of the cement board while suppressing the generation of dust. It is possible to easily and easily manufacture a lightweight cement board having a texture and a texture and an improved appearance and design. A free surface design can be obtained depending on the water absorption state of the cement board surface.

[0009]

EXAMPLES Examples of the lightweight cement board of the present invention will now be described in more detail with reference to the drawings. FIG. 1 is a process sectional view showing a method for manufacturing a lightweight cement board of the present invention. For example, as shown in FIG. 1, in the method for manufacturing a lightweight cement board of the present invention, a lightweight cement board is manufactured by the following steps. <a> First, water (2) is sprinkled and absorbed on the surface portion of the formed lightweight cement plate (1) to make it wet. <B> Next, the sand or shot (3) is sprayed on the surface of the cement plate (1), and blasting is performed,
Roughening the water absorption layer of the cement board (1) in a wet state.
In this blasting treatment, when a dry layer under the water absorbing layer of the cement plate (1) comes out, water (2) is sprayed again to absorb water, and the blasting treatment can be performed again. It is also effective to repeat these operations multiple times.

There are no particular restrictions on the sand that can be used for the blast treatment, and silica sand can be used as an example. The size is, for example, 2 to 6
Can be an issue. In the case of a shot (iron ball),
For example, the size may be 0.3 to 3 m / m. In any case, select and use an appropriate material and size according to the specific gravity of the lightweight cement board (1) and the water absorption state of the surface part of the cement board (1) after spraying water (2) mentioned above. can do. <C> Then, the decorative aggregate (4) existing in the surface layer portion of the lightweight cement plate (1) is exposed on the surface. The texture, texture, etc. of the cement board itself appear, and a lightweight cement board with an excellent appearance design is obtained. The surface can be the same as that obtained by conventional washing and tapping.

For example, in the method for manufacturing a lightweight cement board of the present invention comprising the above steps, since the blast treatment is performed in a wet state where water is absorbed, it is possible to suppress the generation of dust, which is a problem in the conventional blast treatment. .. Further, since the hardness of the cement board surface layer portion is reduced by absorbing water, it is possible to reduce the energy during the blast treatment, and for example, only relatively slow particles of sand or shot are allowed to collide with the cement board surface portion. However, it is also possible to sufficiently roughen the surface of the cement board. This blasting treatment is extremely efficient because it can use less water and sand than, for example, the simultaneous use of water and sand. Furthermore, since the amount of surface grinding by blasting can be varied depending on the water absorption state of the cement plate surface after water sprinkling, a natural uneven surface can be obtained, and a complicated surface can also be dealt with.

A specific production example of the lightweight cement board according to the present invention will be described below. 15-25m / m as coarse aggregate
Sprinkle water on the surface of a lightweight cement board mixed with crushed stones of
After water absorption and a wet state, blasting was performed using No. 5 silica sand, and a crushed stone in various states was exposed on the surface to obtain a natural surface cement plate.

The lightweight cement board produced by the production method of the present invention is useful as, for example, an exterior member used for a fence of a house or the like. Of course, the present invention is not limited to the above examples. It goes without saying that various aspects are possible in terms of details such as the size, shape and specific gravity of the lightweight cement board, and the type and size of the sand and shot used for the blast treatment.

[0014]

As described in detail above, according to the present invention, it is possible to easily and easily manufacture a lightweight cement board having a material appearance, a texture and the like and excellent in appearance design. Generation of dust is suppressed and the working environment is improved. Further, it is possible to easily deal with a complicated surface design.

[Brief description of drawings]

FIG. 1 is a process sectional view showing a method for manufacturing a lightweight cement board of the present invention.

FIG. 2 is a process block diagram showing a conventional cement product manufacturing method.

FIG. 3 is a process block diagram showing another example of a conventional method for manufacturing a cement product.

[Explanation of symbols]

 1 Lightweight cement board 2 Water 3 Sand or shot 4 Decorative aggregate

Claims (2)

[Claims] 1. A method for producing a lightweight cement board, which comprises spraying water on a surface portion of a molded lightweight cement board to absorb water, and then subjecting the surface to a blast treatment. 2. The method according to claim 1, wherein the water sprinkling and the blast treatment are repeated a plurality of times.