JPH0761645B2 - Manufacturing method of building board - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for manufacturing a building board such as a flat roof tile,
Specifically, it relates to a method of forming a raw material in a uncured and uncured state (hereinafter referred to as a green sheet), and more specifically, to simplify a cutting mold and to prevent cracks and the like during curing. Technology.

[Background Art] Conventionally, in order to manufacture a building board such as a flat roof tile by press-cutting a green sheet continuously supplied after papermaking as a forming raw material for a building roof tile such as a flat roof tile, FIG. And, as shown in FIG. 4, a part of the substantially straight cutting line a is left uncut, and its curing is carried out by stacking a large number of sheets as shown in FIG. There is a problem that troubles such as cracks and breakages easily occur because they are close to each other and piled up during the curing. Further, since the cutout decoration b in the middle of the cutting line a is punched or post-processed,
There is a problem that the mold becomes complicated, a post-process is required, the shape of the product is limited in relation to an adjacent one, and the needs of the market cannot be answered. Further, as in the conventional example shown in FIG. 3 and FIG. 5, the building boards D, D in the unit of two sheets are separated from the building boards D, D in the unit of another adjacent set. Before being cut, the adjacent parts are directly connected to each other via a single cutting line a. However,
When the press-molding die is cut along the one cutting line a to separate the two, the misalignment of the die may occur during the operation process of the vertically moving press-molding die. Due to a molding error due to the positional deviation, a quality control problem occurs such that cracks or cracks are generated at the edge of the product of the building boards D, D and defective products are generated.

[Object of the Invention] The present invention has been made in view of such problems,
The purpose is to eliminate the adverse effect on the quality control due to the positional deviation of the press mold even if the press mold is slightly displaced during the operation of the press mold moving up and down. At the same time, a method for manufacturing a building board that avoids punching, simplifies the mold, does not cause trouble during curing, and can set the product shape to various shapes regardless of the adjacent ones. To provide.

DISCLOSURE OF THE INVENTION A method for manufacturing a building board according to the present invention provides a press-molding die having an edge portion edged in a predetermined shape A for a belt-shaped undried uncured raw material 1 that is transferred. By vertically moving up and down, it has a shape in which two building boards D, D having a rotational symmetry of 180 ° with respect to the midpoint b of the grooved curved cutting line B are formed, Press cutting is performed so as to form a rectangular shape, and the above object is achieved by such a method. That is, by forming the ears 2 on the peripheral portion of the predetermined shape to be press-cut molded, it is not necessary to design the press-molding die in relation to the adjacent predetermined shape, and the punching is performed even when the notch is formed. It is not necessary to use a mold, and the mold can be simplified. In this way, there are ears to be removed in the peripheral portion of the predetermined shape that is press-cut by the press-molding die, and therefore, in the operation process of the press-molding die that moves up and down, the position of the press-die is slightly different. Even if the misalignment occurs, the molding error due to the misalignment of the press-molding die is absorbed in the ear portion, and the adverse effect due to the misalignment is eliminated. Moreover, since the molded product cut and molded into a predetermined shape is cured at intervals with the ears on its periphery removed, no cracks or cracks are formed during curing.

Embodiments of the present invention will be described in detail below with reference to the drawings.

The raw material 1 is like an asbestos-cement raw material, and is made into a undried uncured state by papermaking, and is formed into a flat roof tile made of asbestos-cement board. A press molding die in which a dehydrating material such as felt for dehydration is laid on the lower surface of the uncured raw material 1 on a carrier plate, and the edge of the transferred raw material 1 is trimmed into a predetermined shape A to hang down. The raw material 1 can be press-cut and molded into a predetermined shape A. The predetermined shape A is two building boards D, D, for example flat roof tiles, which are rotationally symmetrical with respect to the midpoint b of the curved cutting line B formed by the substantially S-shaped blade at 180 °. Is a shape that is formed. In this curved cutting line B, as shown in FIG. 1 (b), the groove bottom E of the curved cutting line B is continuous so that the groove bottom E can be cut and separated after curing and curing. There is. Then, a groove-shaped curved cutting line B is obtained by vertically moving up and down a press-molding die having an edge portion having a predetermined shape A with respect to the belt-shaped undried uncured raw material 1 that is transferred. It has a shape in which two building plates D, D that are rotationally symmetrical with respect to the midpoint b of 180 ° are formed, and are press cut to form a rectangular shape as a whole. Since the ears 2 to be removed are present in the peripheral portion of the predetermined shape A cut by the die, even if some displacement occurs in the operating process of the press die moving up and down, the press The molding error due to the positional deviation of the molding die is absorbed by the ear portion 2, and the adverse effect caused by the positional deviation is eliminated. Then, the undried uncured ear 2 is removed, the predetermined shapes A ... Are placed on the pallet 3 at intervals, and curing is performed in the curing step.

According to such a method, it is not necessary to design a press-molding die in relation to the adjacent predetermined shape A by forming the ears 2 on the peripheral portion of the predetermined shape A and press-cut forming. Even when the notch is formed, it is not necessary to use a punching die, the die is simplified, and the molded product cut and molded into a predetermined shape A has a peripheral edge 2 [FIG. 1 (a)].
In the shaded area in FIG. 2) is removed to perform curing at intervals so that cracks or breaks do not occur during curing.

[Effects of the Invention] As described above, the present invention vertically moves up and down a press-molding die having an edge portion edged in a predetermined shape with respect to a belt-shaped undried uncured raw material. By this, it has a shape that two building boards to be rotated by 180 ° with respect to the midpoint of the groove-shaped curved cutting line are formed, and is press-cut to form a rectangular shape as a whole. Therefore, there are ears to be removed in the peripheral portion of the predetermined shape that has been press cut by the press molding die, and thus the press molding die may move to some extent during the operation process of the press molding die that moves up and down. Even if the position shift occurs, the molding error due to the position shift of the press molding die is absorbed by the ear portion, and there is an advantage that the adverse effect due to the position shift can be eliminated.

Further, it is not necessary to design a press molding die in relation to a predetermined shape of two adjacent construction boards, and it is not necessary to use a punching die even when forming a notch,
The mold can be simplified. In addition, no cracks or breaks occur during curing. Further, there is an advantage that the predetermined shapes of the two adjacent construction boards can be set to various shapes and can meet the needs of various markets.

[Brief description of drawings]

1 (a) is a plan view of an embodiment of the present invention, FIG. 1 (b) is an enlarged sectional view taken along line XX of FIG. 1 (a),
FIG. 2 is a perspective view of the same molded article during curing, FIG. 3 is a plan view of a conventional example, FIG. 4 is a sectional view of the same molded article, and FIG. 5 is a perspective view of the conventional example during curing. Yes, 1 is a raw material, A is a predetermined shape formed by the raw material, B is a groove-shaped curved cutting line,
b is the midpoint of the groove-shaped curved cutting line, D is a flat roof tile, and 2 is an ear.

Claims (1)

[Claims] 1. A groove-shaped curvilinear cutting is performed by vertically moving a press-molding die having an edge portion edged in a predetermined shape with respect to a belt-shaped undried uncured raw material that is transferred. The construction board is characterized in that it has a shape in which two construction boards are formed which are rotationally symmetrical with respect to the midpoint of the line by 180 ° and are press-cut to form a rectangular shape as a whole. Production method.