JPH0661745B2 - Cement board molding method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a cement plate having an actual ridge and an actual groove by extrusion molding.

[Background Art] When a building board such as an exterior material or a roof tile is formed by a cement board 3, an actual ridge 1 or an actual groove 2 is provided on both sides of the cement board 3 along the entire length as shown in FIG. To be Then, in manufacturing the cement board 3, an extrusion molding method is used from the viewpoint of productivity. That is, as shown in FIG. 3, the cement molding material 5 is extruded into a plate shape from the extrusion die 4 provided at the tip of the extrusion molding machine 11, and this is conveyed to the conveyor 1
It is picked up by 2 and cut into a predetermined size, and is finished into a building board or the like through processes such as curing and painting. When molding the cement board 3 having the actual ridges 1 and the actual concave grooves 2, the actual ridge forming concave portions 13 and the actual concave groove forming protrusions 14 are formed on both ends of the extrusion port 6 as shown in FIG. The extrusion die 4 provided with is used. In FIG. 4, reference numeral 15 is a core for forming the hollow portion 16 in the cement plate 3.

Here, the cement molding material 5 is prepared by blending cement with an aggregate such as silica sand, an inorganic or organic reinforcing fiber, a thickener, etc. and kneading with water. When the cement molding material 5 is extruded through the extrusion port 6 of the mold 4 and passes therethrough, the water in the cement molding material 5 tends to flow to the inner wall surface of the extrusion port 6, particularly to the inner wall surfaces at both ends in the longitudinal width direction. As shown by the arrow in FIG. 4, water flows near the actual projection forming concave portion 13 and the actual concave groove forming projection 14, and this portion is formed by the cement forming material 5 having a large amount of water. When the extrusion molding is performed in this manner, the water content in the actual projecting ridges 1 and the actual concave grooves 2 shown by diagonal lines in FIG. 5 increases, and a cement board 3 having a low strength is obtained in this area. . The actual ridges 1 and the actual concave grooves 2 are places that are actually fitted and used for connection, and are the portions of the cement plate 3 where stress is likely to be concentrated. However, when the strength is weak like this, the actual ridges 1 and The actual concave groove 2 is likely to be cracked or chipped, and the possibility of defects is increased.

[Object of the Invention] The present invention has been made in view of the above points, and provides a method for molding a cement plate, which enables extrusion molding without lowering the strength of the actual ridges or grooves. The purpose is to do.

DISCLOSURE OF THE INVENTION However, in the method for molding a cement plate according to the present invention, the cement plate 3 in which the actual protrusion 1 is provided on one side end and the actual groove 2 is provided on the other side end is extruded from the die 4. When molding by extrusion, the extrusion die 4 is provided with a plurality of extrusion openings 6, 6 through which the cement molding material 5 is passed, and each extrusion opening 6 is formed with a narrow groove portion 7 for forming a real ridge or a real groove forming. Use core 8
And the inner wall surface of the extrusion die 4 are communicated with each other, the cement molding material 5 is extruded using the extrusion die 4, and then the extruded cement molding plate 3 is formed into a thin strip for forming an actual ridge. It is characterized in that the groove portion 7 and the actual concave groove molding core 8 are cut along the extrusion direction, and the actual ridges 1 and the actual concave grooves 2 are the end portions of the extrusion die 4. The present invention will be described in detail with reference to the following examples, in which the strength of the actual ridges 1 and the actual concave grooves 2 can be prevented from being reduced by not molding.

FIG. 1 shows an extrusion die 4 used in the present invention. The extrusion die 4 is formed to have a horizontally long cross section, and a plurality of extrusion ports 6, 6 ... Are provided side by side. A fine groove portion 7 for forming an actual protrusion is provided at one portion of the boundary of each extrusion port 6, and a core 8 for forming an actual concave groove is provided at the other portion of the boundary. Therefore, each extrusion port 6 communicates with the adjacent one extrusion port 6 through the actual projection forming thin groove portion 7, and the adjacent other extrusion port 6 with the actual concave groove forming core 8 and the extrusion die. 4 communicates with the inner wall surface. The extruding port 6 located at the end communicates with the end extruding port 17 through a space between the actual projecting portion forming fine groove portion 7 or the actual concave groove forming core 8 and the inner wall surface of the extruding die 4. . Further, each extrusion port 6 is provided with a core 15 for forming a hollow portion 16 in the cement plate 3.

The extrusion die 4 thus formed is attached to the extrusion molding machine 11 as shown in FIG. 3 to perform extrusion molding. The cement is used as an aggregate, such as silica sand, an inorganic or organic reinforcing fiber, and a thickening agent. A cement molding material 5 prepared by blending materials and the like and kneading with water is extruded from the extrusion die 4, and the extruded cement molding plate 9 is taken by the conveyor 12. At this time, when the cement molding material 5 passes through the inside of the extrusion die 4, water will flow in the longitudinal width direction of the extrusion die 4, but the extrusion port 6,
Since the portion of the actual groove forming fine groove portion 7 and the portion of the actual concave groove forming core 8 between 6 are not located at the end portion of the extrusion die 4, there is no increase in water content at this portion. As shown by the arrow in FIG. 1, the end portion is formed by passing between the actual projection forming fine groove portion 7 and the actual concave groove forming core 8 of the extrusion port 6 located at the end portion and the inner wall surface of the extrusion die 4. It will flow into the extrusion port 17. Therefore, FIG. 2 extruded from the extrusion die 4
In the cement molding plate 9 as shown in (a), it passes between the portion 7a passing through the actual groove forming fine groove portion 7 and the actual concave groove molding core 8 and the inner wall surface of the extrusion die 4. The portion 8a does not have a particularly large amount of water, and the water is not discharged at the end extrusion port 17a.
Thus, the end members 18 formed by passing through will be unevenly distributed.

Immediately after the cement molding plate 9 is thus extruded from the extrusion die 4 and before the cement molding material 5 begins to harden,
The center of the portion 7a formed by passing through the actual ridge forming thin groove portion 7 and the center of the portion 8a formed by passing between the actual concave groove forming core 8 and the inner wall surface of the extrusion die 4. Along Figure 2 (a)
The cement molded plate 9 is cut in the same manner as the chain line, and these are cured and painted to complete the cement plate 3 as a product.
As described above, a large number of cement plates 3 can be obtained by cutting, and the productivity is excellent. Further, at this time, as shown in FIG. 2 (c), the actual ridge 1 of the cement plate 3 is formed by cutting the center of the portion 7a formed by passing through the actual ridge forming thin groove portion 7, Further, the actual concave groove 2 of the cement plate 3 is formed by cutting the center of the molded portion 8a which passes through between the actual concave groove molding core 8 and the inner wall surface of the extrusion die 4. The separated water-rich end member 18 is mixed with the cement molding material 5 and reused.

[Advantages of the Invention] As described above, according to the present invention, a plurality of extrusion openings through which the cement molding material is passed are provided in the extrusion die, and each extrusion opening is formed into a narrow groove portion for forming a real ridge or a real groove. The molding core and the inner wall surface of the extrusion die are communicated with each other, the cement molding material is extruded and molded using this extrusion die, and the extruded cement molding plate is then used to form the narrow groove portion for forming the actual ridge. Since it was cut along the extrusion direction at the part of and the part of the actual groove forming core, when the cement molding material passes through the extrusion mold, the moisture in the longitudinal width direction of the extrusion mold is increased. Even if the water flows, the narrow groove portion for forming the actual ridge between the extrusion ports and the core portion for forming the actual concave groove are not located at the end of the extrusion die, and there is no increase in water content at this portion. The sem which is extruded from the extrusion die There is no particular increase in moisture in the part of the molded plate that passes through the actual ridge forming narrow groove part or the part that passes between the actual concave groove forming core and the inner wall surface of the extrusion die. ,
By cutting these parts, the actual ridges and concave grooves formed on the cement plate will not be molded in a water-rich state, and strong ridges and concave grooves with high strength will be formed. Is something that can be done.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an extrusion die according to an embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are partially cutaway perspective views of the cement molding plate and partially cutaway perspective view of the same. FIG. 3 is a reduced view showing an outline of an extrusion molding apparatus, FIG. 4 is a sectional view of an extrusion die of a conventional example, and FIG. 5 is a partially cutaway perspective view of a cement board obtained by the conventional example. DESCRIPTION OF SYMBOLS 1 is an actual ridge, 2 is an actual groove, 3 is a cement plate, 4 is an extrusion die, 5 is a cement molding material, 6 is an extrusion port, 7 is a fine groove for forming an actual ridge, and 8 is an actual groove. An inner core 9 is a cement molded plate.

Claims (1)

[Claims] 1. A cement molding material is passed through an extrusion mold when a cement plate having an actual protrusion on one side end and an actual groove on the other side end is extruded from an extrusion mold. A plurality of extrusion ports are provided, and each extrusion port is communicated with each other through the narrow groove portion for forming the actual ridges or the core for forming the actual groove and the inner wall surface of the extrusion die, and this extrusion die is used. Characterized in that the cement molding material is extruded and then the extruded cement molding plate is cut along the extrusion direction at the portion of the actual groove forming groove and the portion of the actual groove forming core. Method for forming cement board.