JPH07112687B2 - Light roof tile manufacturing method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a lightweight roof tile.

[Conventional technology]

Conventionally, flat slate tiles that are flat and widely used as cement tiles have been widely used, but since this type of tile tiles is thin, there is a complaint that the roof tiles do not have a solid feeling when they are roofed, and these problems are solved. As such, a so-called thick tile, which has a rich surface relief like a Japanese tile or a Western tile, is formed from a cement raw material.

Since the molding of this thick tile has a shape with abundant surface undulations, general extrusion molding or mass production by a dry method is not suitable, and in general, a molding means called extrusion parade molding was used.

In this extrusion pallet molding, as shown in FIG. 2, the cement kneading material S is supplied to a hopper H, and pallets P ... P which are molds of the roof tile rear surface shape are arranged at the bottom of the hopper H so as to face each other. At the same time that the material S is supplied to the pallet surface by gravity, the pallet is laterally transferred, and the roof tile surface is shaped by the slipper B provided on the side surface of the hopper H in the transfer direction to shape the roof tile surface and shape the roof tile. It is shaped, and has an advantage that it is possible to continuously manufacture a considerably thick tile. (For example, Japanese Patent Application Publication No. Sho 60-501599) [Problems of Prior Art] However, in the case of the above manufacturing method, the material supplied on the pallet is compressed and supplied only by the weight of the material deposited on the pallet. Therefore, although it is later compressed and shaped by the slipper, there is a problem that the density of the shaped body cannot be sufficiently increased and the strength is insufficient.

Therefore, it is necessary to increase the thickness of the roof tile to be formed in order to secure the strength against the cracking of the roof tile during construction, and to improve the strength, which causes a problem that the roof tile weight increases.

[Problems to be Solved by the Invention]

In view of the above problems, the present invention has been made for the purpose of providing a method for manufacturing a lightweight roof tile that is a manufacturing method similar to that described above, but can significantly increase the strength of the roof tile and can be a lightweight roof tile. .

[Technology for solving problems]

That is, in the method for manufacturing a lightweight roof tile of the present invention, the pallets that form the roof tile shape are arranged in a row in abutment with each other, and the pallet is supplied as a material while the cement kneaded product is extruded and supplied from the kneading extruder onto the pallet. Transfer at a speed that is synchronized with the speed, press the slipper that forms the roof tile upper surface on the pallet, press-fill the cement raw material into the pallet, shape the roof tile upper surface, and then cut the molding raw material for each length of the pallet. It is characterized by being cured and cured.

〔Example〕

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

FIG. 1 is a side sectional view of an apparatus for carrying out the method of the present invention.

In the method for manufacturing a lightweight roof tile of the present invention, pallets 1 ... 1 which are molds for the back surface of the roof tile are arranged in a row in abutment with each other, and the cement kneaded material S is extruded and supplied onto the pallets 1 ... 1 from the kneading extruder 2. Meanwhile, the pallets 1 ... 1 are transferred at a speed synchronized with the material supply speed, and a slipper 3 for molding the roof tile upper surface on the pallets 1 ... 1 is pressed to fill the cement raw material into the pallets 1 ... 1 while shaping the roof tile upper surface. Then, the forming raw material is cut by the cutter 4 for each length of the pallet, and thereafter cured and hardened according to a conventional method.

[Operation] In the present invention, the cement raw material S is supplied from the kneading extruder 2.

Therefore, the density of the raw material is sufficiently increased when it is discharged from the extruder, and a dense cement matrix can be formed.

Moreover, since the shaping slipper 3 fills the pallet with the cement raw material and shapes the shape of the surface of the shaped body, the surface shape can be shaped extremely well.

Then, after this step, the product is subjected to high temperature and high pressure curing by primary curing, autoclave, etc. as in the conventional case.

〔effect〕

As described above, since the cement raw material to be supplied onto the pallet is supplied from the kneading extruder, not the hopper, as described above, the structure of the cement kneaded material can be remarkably high in density. As a result, even if the thickness of the roof tile is reduced, the roof tile can be made to have the same strength as the conventional one, and the lighter roof tile can be manufactured as much as the thinner roof tile.

Incidentally, when the roof tile manufactured by the present invention, the roof tile manufactured by the conventional extrusion pallet molding, and the roof tile manufactured by the conventional manufacturing method are compared, the results are shown in the table below.

(The conventional method is the extrusion pallet molding method shown in FIG. 2.) As is clear from the table, the roof tile manufactured by the method of the present invention was manufactured by the conventional method shown in FIG. When comparing the weight of roof tiles that are lighter in weight and superior in strength as compared to roof tiles and exhibit the same strength, the one according to the present invention is about 60
% Weight reduction.

[Brief description of drawings]

FIG. 1 is a side sectional view of an apparatus for carrying out the method of the present invention, and FIG. 2 is a conceptual diagram showing a conventional extrusion pallet molding method. 1 ... Pallet, 2 ... Kneading extruder, 3 ... Slipper, 4 ... Cutter, S ... Cement mixture.

Claims (1)

[Claims] 1. A pallet to be a mold for the back surface of a roof tile is arranged in a row in abutting manner, and while the cement kneaded product is extruded and supplied onto the pallet by a kneading extruder, the pallet is transferred at a speed synchronized with a material supply speed. Then, a slipper for molding the upper surface of the tile on the pallet is pressed to fill the pallet with the cement raw material and the upper surface of the tile is shaped, and then the raw material for molding is cut into pallet lengths and cured to cure. Method for manufacturing lightweight roof tiles.