JPH0818317B2 - Cement board manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a cement board, and more specifically,
For example, the present invention relates to a method for producing a cement board used for a roof tile by giving a natural and varied draining shape.

[Conventional technology]

Conventionally, when manufacturing roof tiles with cement boards,
As shown in FIG. 4, while the raw cement raw material plate A is being conveyed in the form of a belt by the belt conveyor B, it is cut along the cutting lines a and b by the roll cutter and the product material C as shown by the chain line in FIG. After the primary curing of this material C,
Press punching into the solid line shape in Fig. 5 and paint it,
Moreover, the final curing was performed to obtain a cement board D as a product.

In that case, since the peripheral portion E of the product material C comes into contact with the CO ₂ gas in the atmosphere during curing in the press punching, efflorescence occurs, so that this part is cut off for the purpose of improving product quality. The shape of the water draining portion F of the cement board D is changed so that the roofing pattern on the roof surface is changed by the water draining portion.

[Problems of conventional technology]

However, the cement board D obtained by the above conventional method
Then, since the shape of the water draining portion F formed by press punching is standardized and becomes the same shape in all the cement plates D, the line of the water draining portion generated on the roof surface is fixed, and in the thatching pattern, There is no variability, and it is not possible to give the roof surface a variety of expressions.

On the other hand, at the stage of cutting the band-shaped material A in FIG. 4 to obtain the product material C, the cutter blade portion corresponding to the water draining portion of the roll cutter used for the cutting is provided with an irregular shape in advance. Therefore, it is conceivable that the product materials having different draining shapes are continuously formed one by one with the above cutting. However, in such a method, the draining portion cannot be cut off in the press punching after the curing, so that there is a problem that the white flower phenomenon occurring in the draining portion cannot be dealt with.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention cuts the end portion of the cement plate into an irregular shape at the stage of molding the product material, but does not cut off the end portion at the press punching step. The object of the present invention is to provide a method for manufacturing a cement board, which can prevent deterioration of product quality due to a phenomenon.

[Technology that has solved the problem]

That is, in the method for producing a cement plate of the present invention, with respect to the cement raw raw plate continuously supplied in a strip shape, after applying an anti-whitening agent on both side edges of the raw raw plate, the raw raw plate is subjected to a predetermined strip direction. It is characterized in that it is roughly cut for each dimension, and the product material obtained by this cutting is naturally cured and then cut into the product shape except for the part to which the anti-whitening agent is applied.

〔Example〕

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

FIG. 1 is a process explanatory view of an embodiment of the present invention, FIG. 2 is a plan view of the cement board obtained in the above steps, and FIG. 3 is a usage state view of the cement board.

As shown in FIG. 1, the method for manufacturing a cement board according to the present invention is a process in which a belt-shaped cement raw material board 1 is conveyed by a belt conveyor 2 at both side edges of the raw material board 1 (a drainage of the cement board as a roof tile). Part) 1a, 1a, about 30
After applying an anti-white flower agent 3 such as a water-based paint (emulsion paint) or an eflation inhibitor (aqueous fluorinated solution, acrylic emulsion) with a width of up to 50 mm, the raw plate 1
Is roughly cut by a roll cutter (not shown) along the cutting lines a and b at a predetermined interval in the strip-like direction, and is cut on both sides 1a by a cutting line c having an irregular shape as shown in FIG. Then, the product material 4 (chain line portion in FIG. 2) is molded, and after natural curing, the product material 4 is press-punched into a product shape shown by a solid line except for the part to which the anti-whitening agent is applied.

[Action]

According to the above method, at the stage of molding the product material 4,
Since the whitening preventive agent 3 is applied to the part of the cement plate 5 that becomes the draining part 6, the whitening does not occur in the draining part 6 in the curing state, and the draining part is used at the stage of press punching the product material 4. No need to cut off. For this reason, when the product material 4 is molded, the cement cutter 5 having an irregular draining shape can be continuously produced by cutting the draining portion 6 in an irregular shape with a roll cutter. When the roof surface is covered with the plate 5, it is possible to subtly change the roofing pattern as shown in FIG.

〔effect〕

Since the present invention is configured as described above, it is possible to continuously manufacture a cement board having a cutting end surface such as a draining portion that changes irregularly, and eliminate the white sinter that accompanies the deterioration of product quality in the board material. be able to. For this reason, for example, when the cement board is used as a roof tile, there is an effect that the roofing pattern can be delicately changed by the irregularly shaped draining portion, and the expression of the roof surface can be variously changed.

[Brief description of drawings]

FIG. 1 is an explanatory view of a manufacturing process of an embodiment of the present invention, FIG. 2 is a plan view of a cement board obtained in the above process, FIG. 3 is a usage state drawing of the cement board, and FIG. 4 is a manufacturing process of a conventional example. Explanatory drawing and FIG. 5 are plan views of a cement board obtained by a conventional method.

Claims (1)

[Claims] 1. A cement raw plate which is continuously supplied in a strip shape, and after applying a whitening preventive agent on both side edges of the raw plate,
The raw raw plate is roughly cut in a predetermined direction in a strip-like direction, and the product material obtained by this cutting is naturally cured and cut into a product shape except for the above-mentioned anti-whitening agent application portion. Cement board manufacturing method.