JP2648189B2 - Manufacturing method of inorganic plate material - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing an inorganic plate material, and more particularly, to a method for performing a gouge step pressing process on both ends of an inorganic building material.

[Conventional technology]

BACKGROUND ART Conventionally, plate materials have been widely manufactured from hydraulic materials such as cement.

In general, in order to improve the connection strength and waterproofness of the connection portion of the seed plate, a joining step portion that fits in a male and female relationship is formed by press molding.

[Problems of the prior art]

By the way, in the case of press-forming the joining step, the third step
As shown in the figure, since a shearing force acts on the pressed portions B, B of the plate material A, a fragile portion is generated in the structure of the processed portion. Had a problem that it became remarkably vulnerable to frost damage.

In particular, in the sheet material of the laminated structure formed by the papermaking method,
Since the interlayer adhesion tends to be weakened during the press working, the above-mentioned drawbacks become more remarkable.

Therefore, frost damage on the exterior wall plate or the like mostly occurs from this portion.

However, such a drawback can be prevented by densifying the structure of the inorganic plate material and increasing the specific gravity, but the hardness of the molded article becomes too high, and the workability such as sawing property and nailing property is lost, There is a problem that it cannot be used as a building material.

[Problems to be solved by the invention]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a method for producing an inorganic plate material capable of exhibiting sufficient strength against frost damage and the like without impairing workability.

[Technology that solved the problem]

That is, the method for producing an inorganic plate material of the present invention is characterized in that a raw material of the same quality as the raw material is overlaid on a press-processed surface of an uncured plate material made of a hydraulic raw material such as cement, and then a concave press process is performed. It is.

[Action]

When the uncured inorganic plate material is pressed, as shown in FIG. 3, a pressed portion B and a non-pressed portion A
In this case, a dense portion of the material occurs due to the pressing pressure, and the boundary C becomes clear.

 For this reason, stress tends to concentrate on the boundary portion C.

Therefore, as shown in FIG.
In addition, if the inorganic raw material 4 is overlaid in advance, and then the press working 5 is performed as shown in FIG. 2, the flow of the material 4 in the overlaid portion causes the inorganic raw material 4 to be moved to the unprocessed portion.
The recess 6 is formed without causing a clear boundary between the dense and dense portions.

Therefore, a significant partial strength shortage does not occur.

〔Example〕

 Next, an embodiment of the present invention will be described.

The thickness of 0.5mm, 1.0mm,
Raw materials of the same quality were overlaid at 2.0 and 3.0 mm, and pressed to a thickness of 2.5 mm of the recessed portion 6 as shown in FIG.

Next, the plate material was cured and cured according to a conventional method, and the specific gravities of the non-overlaid portion and the overlaid portion were measured. The results shown in Table 1 were obtained.

Next, a freeze-thaw test was performed on the plate material, and the results shown in Table 2 were obtained.

In Tables 1 and 2, a build-up thickness of 0.0 mm indicates a comparative example.

〔effect〕

As described above, the present invention builds up the same material only in the portion to be pressed, so that abrupt changes in the density of the structure due to the step in the pressed portion can be avoided. In addition, since the portion which is not overlaid and the material having the same low specific gravity as the conventional one can be formed, the workability as a plate material is not hindered.

[Brief description of the drawings]

1 and 2 are explanatory views of the operation of the present invention, and FIG. 3 is a sectional view of a conventional example.

Claims (1)

(57) [Claims] 1. A method for producing an inorganic plate material, comprising: placing a raw material of the same quality as the raw material on a press-processed surface of an uncured plate material made of a hydraulic raw material such as cement;