JPH05124851A - Production of fired tile - Google Patents

Abstract

PURPOSE:To produce a fired tile without cracking the body of a tile even if the raw body of tile shrinks at the time of drying. CONSTITUTION:Clay for forming a fired tile is kneaded with glass fibers added with 0.5-15wt.% of the amt. of the clay to form the body of a tile and this body is formed into a strip, cut to the size of a single tile, molded and dried. The molded body is fired at the melting temp. of the glass fibers or above to produce the objective fired tile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a fired roof tile.

[0002]

2. Description of the Related Art Roof tiles are roughly classified into cement roof tiles (mortar roof tiles) and fired roof tiles, and since fired roof tiles have fine and beautiful textures, they are used for roofs of shrines, Buddhist temples, or authentic Japanese-style buildings. Has been. In the case of producing such a fired roof tile, conventionally, the clay for forming a fired roof tile is first formed into a strip plate shape.

Next, the clay for forming a fired roof tile formed into a strip shape is cut into a predetermined size to form a substantially rectangular roof tile material. The roof tile material thus formed is formed into a roof tile shape by a press or the like, dried in the sun, and then fired and smoked at a high temperature to attach carbon to the surface.

[0004]

In the above-mentioned conventional method for producing a fired roof tile, when the roof tile material is dried by utilizing the residual heat of the firing kiln, the roof tile material is gradually dried and shrunk to change the location and the shape where the thickness changes. Cracks are likely to occur on the part. Since the rate of occurrence of this crack is relatively high, there is a problem in that if a crack occurs, it cannot be made into a product, resulting in a poor yield and a great decrease in productivity.

Moreover, there is also a problem that the cost is high due to poor productivity. The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a method for producing a fired roof tile in which cracks do not occur even when the roof tile material is dried and shrunk during drying.

[0006]

In order to achieve the above object, a method for producing a fired roof tile according to the present invention comprises a clay for forming a fired roof tile and 0.5 to 1.5% by weight of glass fiber with respect to the clay. After kneading to form a roof tile material, forming the roof tile material into a strip plate, cutting it into the size of a single roof tile, molding and drying, and then molding the roof tile material to the glass fiber melting temperature. It is characterized by being fired as described above.

[0007]

According to the method for producing a fired roof tile of the present invention, first, when glass fiber is kneaded with clay for forming a fired roof tile to form a tile roof material, the glass fibers are substantially evenly distributed in the tile roof material. It becomes a state. This roof tile material shrinks when it is dried by using, for example, the residual heat of the kiln.

At this time, cracks tend to occur due to shrinkage in the portion where the thickness or shape of the roof tile material that has been formed changes, but the shrinkage is prevented by the glass fiber and the occurrence of cracks is prevented. When the roof tile material is fired at a temperature higher than the melting temperature of the glass fiber, the glass fiber kneaded with the roof tile material melts and penetrates into the gaps between the roof tile materials, and acts to reinforce the roof tile.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. Figure 1
2 is a perspective view of a fired roof tile formed by the method of the invention, FIG. 2 is a front view of the fired roof tile, and FIG. The fired roof tile 1 is formed by sequentially forming a semi-cylindrical portion 2 at one end and a plate-like portion 3 gently curved in the opposite direction.

In order to manufacture the fired roof tile 1, first, when the fired roof tile formation clay is kneaded, the fired roof tile formation clay 4 is used.
The glass fiber 5 of a predetermined ratio is kneaded. The mixing ratio of the glass fiber 5 to the clay 4 for forming the baked roof tile is 0.
It is in the range of 5 to 1.5% by weight.

That is, when the content of the glass fiber 5 is 0.5% by weight or less, the amount of the glass fiber mixed is too small to sufficiently prevent the generation of cracks during drying, and when it exceeds 1.5% by weight, conversely. The amount of the glass fibers 5 mixed in is too large, so that the tile material, which will be described later, is formed into a strip plate and cut into the size of the tile, which is not only difficult to cut but also a large amount of glass is present in the cut surface portion. This is because the fiber 5 is in an uncut state and pops out, and when it is fired, it adheres to the cut surface portion and when it is smoked, it becomes difficult to uniformly deposit carbon.

When the clay 4 for forming the fired roof tile and the glass fiber 5 are sufficiently kneaded to form the roof tile material, the roof tile material is formed into a strip plate and then the roof tile is cut with a cutter or the like. Is cut into a single size, and a substantially rectangular roof tile material is formed. Next, the roof tile material is inserted between the upper die and the lower die of the press to form a semi-cylindrical portion 2 at one end as shown in FIG. 1, and a plate shape gently curved in the opposite direction. Part 3
And is formed into a series of shapes, and then dried using the residual heat of the firing kiln.

During this drying, the tile material shrinks, and cracks due to drying shrinkage tend to occur in the portion M where the thickness T1 and T2 of the molded tile material changes or the shape changes. To prevent the occurrence of cracks (see FIG. 3).

When the roof tile material is sufficiently dried, it is fired in a firing pot at the melting temperature of the glass fiber 5, for example, 1000 ° C. or higher. Then, the glass fibers 5 kneaded with the tile material are melted and permeate into the gaps of the tile material 4, and act to reinforce the tile. As a result, the strength and durability of the roof tile can be significantly improved as compared with the conventional fired roof tile.

After that, when the surface is smoked to attach carbon, the smoked roof tile 1 whose surface is shining silver is formed. Although the roof tile material is dried by utilizing the residual heat of the firing kiln in the above-mentioned embodiment, it is needless to say that the roof tile material may be naturally dried by the sun instead of or together with it.

Further, although the surface of the roof tile is smoked, it goes without saying that the roof tile may be coated with silver paint.

[0017]

As described above, the present invention shrinks the molded roof tile material when it is dried in the sun, for example.
Glass fibers prevent cracks from occurring in areas where the thickness or shape of the tile material changes and prevent cracks from occurring, thus preventing productivity from decreasing due to cracks and increasing yield. It is possible to increase the productivity and greatly improve the productivity.

In addition, since the productivity can be increased, there is an advantage that the manufacturing cost in mass production can be reduced.

Furthermore, since the roof tile material is fired at a temperature higher than the melting temperature of the glass fiber, the glass fibers kneaded into the roof tile material melt and penetrate into the gaps of the roof tile material to reinforce the roof tile. Therefore, there is also an advantage that a fired roof tile having excellent durability can be produced.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a fired roof tile.

2 is a front view across the center of the fired roof tile of FIG. 1. FIG.

FIG. 3 is a partially enlarged sectional view of a roof tile material.

FIG. 4 is a partially enlarged sectional view of a fired roof tile.

[Explanation of symbols]

 1 ... Fired tile 4 ... Clay for forming fired tile 5 ... Glass fiber

Claims (1)

[Claims] 1. A clay for forming a baked roof tile and 0.5 with respect to the clay.
~ 1.5 wt% glass fiber was kneaded to form a tile material, and the tile material was formed into a strip plate, cut into the size of a tile, molded, dried, and then molded A method for producing a fired roof tile, wherein the roof tile material is fired at a temperature above the melting temperature of glass fiber.