JPH0444805A - Cement plate manufacturing method - Google Patents

Abstract

PURPOSE:To prevent quality of a finished product from degenerating due to the whitewash phenomenon by applying a whitewash preventive to both side parts of a crude cement plate continuously fed in the shape of belt and severing the same according to a predetermined measure. CONSTITUTION:During the process of feeding a crude cement plate in the shape of belt 1 by a belt conveyor 2, a whitewash preventive 3 such as aqueous paint (emulsion paint) and efflorescence preventive (silicofluoride solution, acrylate emulsion) is applied to both side parts 1a and 1a of the crude plate 1 (the prospective drip part of a cement plate as a roofing tile) in a width of approximately 30 to 50mm, the crude plate 1 is severed by a roll cutter at prescribed intervals along the cutting lines (a) and (b) in a direction of belt. The so severed parts are given the cut at both side parts 1a according to an irregularly shaped cutting line (c), molded into a material for finished product 4 and after spontaneous curing the portion thereof having the application of the whitewash preventive is removed, followed by press punching the material into a finished product in a shape shown by the solid line.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for manufacturing cement boards, and more specifically, to a method for producing a cement board used for roof tiles, for example, to provide a natural and variable drainage shape. The present invention relates to a method for manufacturing the same.

[Conventional technology]

Conventionally, when manufacturing roof tiles using cement boards, as shown in Fig. 4, the main cement FiA is conveyed in a belt shape by a belt conveyor B, and then cut along cutting lines a and b using a roll cutter. A product material C as shown in the chain line in Fig. 5 is obtained, and after the primary curing of this material C, it is press punched into the solid line shape shown in Fig. 5, painted, and subjected to final curing to produce cement as a product. It was like a board.

In that case, the above-mentioned press punching is performed to cut off the peripheral part E of the product material C for the purpose of improving product quality, since the peripheral part E of the product material C efflorescences due to contact with CO and gas in the atmosphere during curing. This is done in order to change the shape of the drainage part F of the cement board so that the roofing pattern on the roof surface is changed by the drainage part.

[Problems with conventional technology]

However, in the cement board obtained by the above conventional method, the shape of the draining part F formed by press punching is standardized and the shape is the same for all cement boards, so the line of the draining part that appears on the roof surface is is fixed, and there is not much variation in the roofing pattern, making it impossible to give the roof surface a variety of expressions.

For this purpose, cut the strip material A shown in FIG.

At the stage of obtaining the product material C, by forming an irregular shape in advance on the cutter blade part of the roll cutter used for the cutting, which corresponds to the above-mentioned draining part, each piece is cut one by one. It is possible to continuously form product materials having different cutout shapes. However, 1. With this method, it is not possible to cut off each cutout part in the press punching after curing, so , there is a problem that it becomes impossible to deal with the efflorescence phenomenon.

[Problem to be solved by the invention]

In view of the above-mentioned problems, this invention involves cutting the edges of a cement board into an irregular shape at the stage of forming the product material, but without cutting off the edges at the press punching stage. The purpose of this invention is to provide a method for manufacturing cement boards that can eliminate deterioration in product quality due to this phenomenon.

(Technology that led to solving the problem) That is, the method for manufacturing a cement board of the present invention involves applying an efflorescence preventive agent to both side edges of the raw cement board that is continuously supplied in the form of a strip. 1. Roughly cut the nucleated plate in the zonal direction in a prescribed manner. The product material obtained by this cutting is characterized in that after natural curing, the product material is cut into a product shape, excluding the area where the anti-whitening agent is applied.

[Example] Next, the present invention will be explained in detail.

FIG. 1 is an explanatory diagram of the first embodiment of the present invention, FIG. 2 is a plan view of the cement board obtained in the above process, and FIG. 3 is a diagram showing the cement board in use.

As shown in FIG. 1, in the method of manufacturing a cement board of the present invention, in the process of conveying a band-shaped raw cement board 1 by a heald conveyor 2, the edges of both sides of the raw cement board 1 (water draining of the cement board as a roof tile) are removed. 30 to 50M11 wide, apply water-based paint (emulsion paint) or ESO L1i1Li) agent (gay fluoride aqueous solution,
After that, the original plate 1 is roughly cut at a predetermined corner in the strip direction along cutting lines a and b using a roll cutter (not shown). , the above-mentioned both sides 1a are cut along irregularly shaped cutting lines C as seen in FIG. After curing, examine the area where the anti-efflorescence agent is applied and punch out the product shape as shown by the solid line.

[Effect]

According to the above method, since the efflorescence preventive agent 3 is applied to the part of the cement board 5 that will become the drainage part 6 at the stage of molding the product material 4, efflorescence does not form in the drainage part 6 during curing. This eliminates the need to cut off the drained portion at the stage of press punching the product material 4. For this reason, by cutting the draining portion 6 into an irregular shape using a roll cutter at the stage of forming the product material 4, it is possible to continuously manufacture cement boards 5 having an irregular draining shape. When the roof surface is covered with the boards 5, it is possible to subtly change the roofing pattern as shown in FIG.

〔effect〕

Since the present invention is configured as described below, it is possible to continuously manufacture cement boards having cut end surfaces such as draining parts that change irregularly, and it also prevents efflorescence from occurring in the board material, which causes deterioration in product quality. It can be eliminated. For this reason, when the cement board is used as a roof tile, for example, the roofing pattern can be subtly changed by the irregularly shaped drainage parts, and the expression of the roof surface can be varied in various ways.

[Brief Description of the Drawings] Fig. 1 is an explanation of the manufacturing process of an embodiment of the present invention, Fig. 2 is a plan view of the cement board obtained in the above process, Fig. 3 is a diagram of the use state of the cement board, and Fig. 4 is The figure is an explanatory diagram of the manufacturing process of a conventional example, and FIG. 5 is a plan view of a cement board obtained by the conventional method. [More: l, -L1+ γ 1m v2 out!・-・v；）Life value 5・・Paris〉）Detective'l solid 4i

Claims (1)

[Claims] (1) After applying an efflorescence preventive agent to both edges of the raw cement raw plate that is continuously supplied in the form of a strip, the raw raw cement plate is roughly cut into predetermined dimensions in the direction of the strip. 1. A method for manufacturing a cement board, which comprises: natural curing the product material obtained by the method, and then trimming and cutting the material into a product shape, excluding the areas coated with the anti-efflorescence agent.