JPS6223708A - Method of molding building board - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a method for forming architectural boards such as flat tiles,
More specifically, it relates to a method of forming a plate material in an undried, uncured state (hereinafter referred to as a green sheet) that has been paper-made, and more specifically, a method for forming a plate material in an undried, uncured state (hereinafter referred to as a green sheet). It relates to technology that attempts to suppress the occurrence of such occurrences.

[Background technology 1 Conventionally, recesses are formed on the surface of green sheets that are continuously supplied after papermaking as raw materials for forming architectural boards such as flat tiles, for drainage grooves, decorations, etc. A dehydration material such as felt for dehydration is laid on the bottom surface of the green sheet in a hardened state. When a soft dehydration material is placed on the bottom surface of the material in this way, a convex portion 5a is placed on the bottom surface of the green sheet as shown in FIG. When the convex mold 3 having the material is pressed against the surface of the plate material 1 to form the recess 4, a protruding portion X of the material is generated on the lower surface side of the recess 4. When the protruding portion X is generated in this way, as shown in FIG. When the molded product M is cured by being sandwiched between two plates such as iron plates, there is a problem in that the protruding portion X is depressed and the recess 4 is also returned, causing the recess 4 to be deformed.

[Object of the invention] The present invention has been made in view of these problems,
The purpose is to provide a method for forming a construction board that can form recesses in a green sheet in a predetermined manner with a simple configuration.

[Disclosure of the Invention] The method for forming a building board according to the present invention is to lay a dewatering material 2 such as felt for dewatering on the lower surface of a board material 1 in an undried and uncured state, and to form a convex mold 3 on the top surface of the board material 1. When the recess 4 is formed by contacting the recess 4, a hard contact plate 5 is placed on the lower surface side of the plate material 1 corresponding to the recess 4, and by such a method, the above purpose can be achieved. This has been achieved.

In other words, by disposing the hard contact plate 5 on the lower surface side of the plate material 1, even if the convex mold 3 is pressed against an undried and uncured green sheet to form the recess 4, the lower surface of the plate material 1 The protruding portion
This allows the molding to be performed satisfactorily without causing deformation.

Embodiments of the present invention will be described in detail below based on the drawings.

The board material 1 is like an asbestos-cement board material, and is made into a sheet in an undried and uncured state, and is formed into a roof tile or the like made of an asbestos-cement board. A dewatering material 2 such as felt for dewatering is spread on a carrier plate 6 on the lower surface of the plate material 1 in an undried and uncured state. When a convex mold 3 having a convex portion 5a is brought into contact with the upper surface of the plate material 1 to form a recess 4, a hard backing plate 5 is placed on the lower surface side of the plate material 1 corresponding to the recess 4. The backing plate 5 may be made of urethane rubber or engineering plastic.

According to such a method, by disposing the hard backing plate 5 on the lower surface side of the plate material 1, even if the convex mold 3 is pressed against the green sheet in an undried and uncured state to form the recess 4. , plate material 1
The protruding portion X does not protrude from the lower surface side of the recess 4. Therefore, the recess 4 does not deform when it is sandwiched between two plates such as iron plates as shown in FIG. The molding process can be performed satisfactorily without causing deformation.

The contact plate 5 is attached to the carrier plate 6 with screws 7, etc., and the top of the contact plate 5 is slightly higher than the upper surface of the dewatering material 2.

The convex mold 3 is provided with a cutting blade 8, and at the same time as the recess 4 is formed, the plate material 1 is cut to an appropriate length to form a flat tile N as shown in FIG.

In addition, in the example, the groove-shaped recess 4 was formed, but $
It may also be used for chamfering as shown in Figure 3.

[Effects of the Invention] In short, the present invention disposes a hard backing plate on the lower surface of the board material, so even if a convex mold is pressed against an undried and uncured green sheet to form a recess, the board There is no protruding part on the lower surface of the material, so there is no deformation of the recess even during curing, and there is an advantage that the recess can be formed well.

[Brief explanation of drawings]

Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view of the same molded product during curing, Fig. 3 is a sectional view of the molded product showing another construction example of the above, and Fig. 4 is a perspective view of a molded product of the present invention,
Fig. 5 is a sectional view of the conventional example, and Fig. 6 is a sectional view of the same as above during curing, where 1 is a plate material, 2 is a dewatering material, 3 is a convex type, 4 is a recess, and 5 is a backing plate. . Agent Patent Attorney Ishi 1) Ai Figure 7 1

Claims (1)

[Claims] (1) When forming a recess by placing a dehydrating material such as felt for dewatering on the underside of an undried and uncured board material and abutting a convex mold on the upper surface of the board material, a board corresponding to the recess is formed. A method for forming a construction board, characterized by placing a hard backing board on the lower surface of the material.