JP2000233963A - Production of clay tile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably keep tile body in a self-supporting state and to prevent the fall of the tile body in firing by flat grinding the contact part of the tile body prior to firing even if the tile body is distorted by shrinkage due to drying in the production of a clay tile. SOLUTION: When molded tile body 10 is dried and fired in a self-supporting state to produce a clay tile, the contact part 22 of the dried clay body 10 on the bottom 14 side is flat ground so that the clay body 10 can self-support and the clay body 10 is allowed to self-support through the ground contact part 22 and fired in the self-supporting state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a clay tile, and more particularly to a method for manufacturing a clay tile in which a dried tile body is fired in an independent state.

[0002]

2. Description of the Related Art Generally, in the production of clay roof tiles, tile bodies formed by a press molding machine or the like are dried since they are in an undried state, and the dried tile bodies are thereafter fired. The firing of the tiles is performed by a firing furnace, and the firing is often performed in a so-called self-standing state in which the tiles have a head upward and a butt downward.

[0003] By the way, when drying the tile, it is inevitable that shrinkage accompanying the drying occurs in the tile. For example,
As shown in FIG. 9, in the case of firing the tile body W in a self-supporting state, the abutting portion S (an end surface on the tail side) of the tile body W is distorted due to drying shrinkage, and the warped tile body W is self-supporting. The center of gravity G of the tile body W in the state moves. When the center of gravity G of the tile body W in the self-standing state moves due to the distortion of the tile body W, the tile body W becomes an unstable self-standing state, and there is a possibility that the tile body W may fall over in the firing furnace.

[0004] In particular, in the case of F-type clay tiles (so-called flat tiles), since the thickness of the tiles is small, distortion due to drying shrinkage is apt to be evident, and the F-type clay tiles are more stable. There has been a strong demand for firing tiles in a self-sustaining state.

[0005]

An object to be solved by the present invention is to produce clay tiles for firing a tile material in a self-standing state, in which distortion due to drying shrinkage of the tile material is reduced due to shrinkage of the tile side. If it occurs at the contact portion, it becomes an unstable self-supporting state, and the tile body may fall down in the firing furnace.
An object of the present invention is to provide a method of manufacturing a clay tile in which a stabilized free standing tile body is fired and the tile body does not fall in a firing furnace.

[0006]

In order to achieve the above object, a method of manufacturing a clay tile according to the first aspect of the present invention comprises drying a formed tile and then firing the tile in an independent state. In the method of manufacturing clay tiles, the abutting portion of the dried tile material is ground flat so that the tile material becomes stable and self-supporting, and the tile material becomes independent through the ground contact portion. And firing the self-supporting tile body.

Therefore, in the method for manufacturing a clay tile according to the first aspect, the abutting portion of the dried tile body is ground flat prior to firing so that the tile body maintains a stable self-standing state. Then, the tile body is made to stand by itself through the ground contact portion, and the tile body in a self-standing state is fired. At this time, even if the tile body is distorted due to drying shrinkage, the abutting portion on the buttocks side is ground flat, so that the tile body can maintain a stable self-standing state.

[0008] The method for manufacturing a clay tile according to the first aspect has the following advantages since it is configured as described above. Even if the tile is deformed due to drying shrinkage, the abutting portion on the buttocks side is ground flat, so that the tile is kept in a self-supporting stable state and there is no possibility that the tile will fall over during firing. In addition, by grinding the contact portion on the tail side, the finish of the tail of the tile body becomes more beautiful.

In the method for manufacturing a clay tile according to a second aspect of the present invention, in the method for manufacturing a clay tile according to the first aspect, the contact portion on the tail side of the tile body is formed as a projection.

Therefore, in the method for manufacturing a clay tile according to the second aspect of the present invention, in the method for manufacturing a clay tile according to the first aspect, the abutting portion on the tail side of the tile body is formed as a projecting body. Only the grinding is required, and the time required for grinding the contact portion before firing is further reduced.

The method for manufacturing a clay tile according to the second aspect has the following advantages because it is configured as described above. In addition to the effect of the invention of the method for manufacturing a clay tile described in claim 1, the time required for grinding the contact portion before firing is further reduced, and the productivity of the clay tile is not reduced.

[0012]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing the self-standing state of the tile according to the embodiment, FIG. 2 is a perspective view of the tile according to the embodiment, and FIG. 3 is an enlarged view showing a ground portion of the tile according to the embodiment. FIG. 4 is a side view showing a self-standing state of a tile body having a protruding body as a contact portion, FIG. 5 is a perspective view of a tile body having a protruding body as a contact section, and FIG. 7 and 8 are perspective views of a tile body provided with a projection according to another embodiment, and FIG. 9 is a side view showing a self-standing tile body in a conventional example. FIG.

First, a raw material mainly composed of clay containing water is press-formed by a press-forming machine (not shown) to obtain a tile body 10 as shown in FIG. The tile body 10 of this example is an F-type clay tile, and is called a so-called flat tile.

In this specification, when the tile substrate 10 is laid on a roof, the end of the tile substrate 10 located on the eave side is referred to as a head 12 and the end located on the ridge side is referred to as a tail 14. In addition, tile foundation 1
On one side, an underlap portion 16 is provided, on the other side, an overlap portion 18 is provided, and two hooks 20 are provided on the back surface M near the buttocks 14 at a constant interval. Have been. The tile substrate 10 in this embodiment
An end surface on the side of the tail 14 is an abutting portion 22 for abutting with a shelf plate 24 provided on a baking cart (not shown) in the self-standing tile body 10 at the time of baking described later (FIG. 1).
And FIG. 2).

The formed tile body 10 is dried by a drying furnace (not shown) because it contains moisture, but is placed horizontally on a drying pallet to minimize distortion during drying. It is dried in the state. The undried tiles 10 are formed continuously, and a tunnel-type or batch-type drying furnace is used for these tiles 10.

There is a possibility that the dried tile body 10 may be distorted due to drying shrinkage, and irregularities or the like due to the distortion may be generated in the abutting portion 22 of the tail side of the tile body 10. In this case, the tile body 10 cannot be made independent or is in an unstable self-supporting state. If the tile body 10 in which the self-supporting state is unstable is fired, the tile body 10 may fall over in the firing furnace.

That is, if unevenness or the like due to distortion occurs in the abutting portion 22 on the buttocks side, the center of gravity G of the tile body 10 in the self-standing state (in this embodiment, located substantially at the center of the tile body 10) moves. However, if the contact portion is not located in the vertical direction of the moved center of gravity G, the tile body 10 cannot maintain its self-standing state.

On the other hand, even if the contact portion 22 is located in the vertical direction of the center of gravity G of the tile substrate 10, if the contact portion 22 slightly stays, the tile substrate 1 is slightly affected by a slight vibration or impact.
0 will easily fall over. On the other hand, the falling of the tile body 10 at the time of firing is caused not only by unevenness due to drying distortion, but also by burrs which tend to occur at the time of forming the tile body 10 (see FIG. 3).

Therefore, in this embodiment, the end face of the dried tile material 10 on the side of the tail 14, that is, the contact portion 22 is ground flat. It is necessary to grind the substrate 10 so that it is stable when the substrate 10 is made self-supporting.

Therefore, the center of gravity G of the tile substrate 10 is
0, it is necessary that the center of the contact portion 22 be located in the vertical direction of the center of gravity G in the self-standing state of the tile body 10, and the ground surface of the contact portion 22 is It may be perpendicular to the front surface M or the back surface N of 10 (see FIG. 3).

In this embodiment, a belt-type grinding machine (not shown) provided on a conveyor is used as a specific means for grinding the contact portion 22. The grinding machine has an endless grinding machine. The belt is provided so that it can be driven to circulate. The dried tile substrate 10 is conveyed on the conveyor, the grinding machine approaches the tile substrate 10 being transported, and the grinding belt is pressed against the contact portion 22 of the tile substrate 10 to perform grinding. Of course, the type of the grinder does not matter, such as a grinder in which a grindstone rotates and a grinder in which a cutting blade moves.

The tile body 10 ground by the grinding machine is mounted on a firing cart. The contact portion 22 is grounded on a shelf 24 provided on the firing cart, and the head 12 of the tile base 10 is grounded.
Are placed upward. At this time, the shelf 24
The contact portion 22 of the tile body 10 that is in contact with the tile body 10 is formed at right angles to the front surface M or the back surface N of the tile body 10, so that the center of gravity G of the tile body W does not move, and The vicinity of the center of the contact portion 22 is located, and the tile body 10 maintains a stable self-standing state (see FIGS. 1 and 3).

Then, the firing cart carrying the tile substrate 10 passes through a tunnel-type firing furnace (not shown), whereby the tile substrate 10 is fired. The tile substrate 10 maintains a stable self-standing state. As a result, there is no possibility of falling over due to vibrations and impacts during the movement of the firing cart. Further, even if the tile 10 is distorted due to heat during firing, the tile 10
Maintains a stable self-supporting state prior to firing,
The possibility that the tile body 10 falls over during firing is small.

Note that the tile substrate 10 in this embodiment is
Is an F-type clay tile, but the type is not limited as long as it is a tile body that can be fired in a self-supporting state, such as a J-type clay tile, an S-type clay tile, and these accessory tiles.

Next, a description will be given of an embodiment in which the contact portion of the tile body is a projection. The tile substrate 30 of this embodiment
The head 32, buttocks 34, underlap portion 36, overlap portion 38, hook portion 4
It is an F-type clay tile with 0. In this embodiment, four protrusions 42 are provided on the end face of the tile base 30 on the side of the tail 34 (see FIG. 5). In this embodiment, unlike the previous embodiment, the projection 42 corresponds to the contact portion.

The protrusions 42 are provided on the tile base 30 near the ends of the hooks 40 on the end face on the side of the tail 34, respectively. One of them is provided near the surface M of 38. These protrusions 42 are provided so as to protrude from the end face on the side of the tail 34 by about 1 to 2 mm, and have a substantially quadrangular prism shape (see FIG. 5).

Then, as in the previous embodiment, the tile body 30 is formed and dried. Next, the protruding body 42 which is the contact portion of the dried tile body 30 is ground. At this time, the surface of each protrusion 42 is ground flat so that the ground protrusions 42 abut on the same plane in order to maintain a stable self-standing state of the tile body 30 during firing. The ground tile body 30 that has been ground is mounted on a firing cart in a self-standing manner and fired as in the previous embodiment (see FIGS. 4 and 6).

At this time, since the center of gravity G of the tile body 30 is located at a position passing substantially near the center between the projections 42 in the vertical direction, the tile foundation 30 supported by the four projections 42 is provided. Can maintain a stable independence state.

As described above, in this embodiment, only the four protrusions 42 provided on the tile body 30 need to be ground, and the time required for grinding can be shortened. And the tile substrate 30 is not damaged by grinding. Further, the size of the grinding machine can be reduced, the load on the grinding machine can be reduced, and the dust caused by grinding can be suppressed to a minimum. Further, since the contact surface with the shelf board 24 is extremely suppressed, the heat of firing easily acts evenly on the tile substrate, and the deformation of the tile substrate 30 during firing can be further reduced.

In this embodiment, the tile substrate 30
Are provided with four protrusions 42, but in order to enable the tile foundation 30 to be self-supporting, the number of the protrusions 42 is not limited, and the form of the protrusions 42 is Any shape that protrudes from the end face on the side of the buttocks 34 may be used.

Next, FIG. 7 shows a tile body 50 in the form of a projection 54 of another form. Projection 5 of tile body 50 in FIG.
4 are provided near the hooks 52, 52, respectively.
The form is a substantially hexagonal column, and the protrusions 54 are ground flat before firing the tile body 50. The two protrusions 54 are formed in an inverted “C” shape and have a wider contact surface than the protrusions 42 of the tile body 30 according to the above embodiment, so that the tile body 50 can be It can stabilize and become independent.

Next, FIG. 8 shows a tile body 60 in the form of a projection 64 of still another form. The protrusion 64 of the tile body 60 in FIG. 8 has a form substantially following the end surface of the tile body 60 on the tail side, and the protrusion 64 is ground flat before firing the tile body 60. By forming the protruding body 64 following the end face on the tail side of the tile body 60, the number of the protruding bodies 64 can be reduced to one.

[Brief description of the drawings]

FIG. 1 is a side view showing a self-supporting state of a tile body according to an embodiment.

FIG. 2 is a perspective view of the tile body according to the embodiment.

FIG. 3 is an enlarged view showing a ground portion of the tile body according to the embodiment.

FIG. 4 is a side view showing a self-standing state of the tile body having a contact portion as a projection.

FIG. 5 is a perspective view of a tile body having a contact portion as a projecting body.

FIG. 6 is an enlarged view showing a ground portion of a tile body having a contact portion as a projection.

FIG. 7 is a perspective view of a tile body showing a projection according to another embodiment.

FIG. 8 is a perspective view of a tile body showing a projecting body according to still another embodiment.

FIG. 9 is a side view showing a self-standing tile body in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 tile base 12 head 14 buttocks 16 underlap part 18 overlap part 20 hook part 22 contact part 24 shelf board 30 tile base 32 head 34 tail 36 underlap part 38 overlap part 40 hook part 42 projecting body 50 tile base 52 Hooked part 54 Projected body 60 tile body 62 Hooked part 64 Projected body G Center of gravity M Front surface N Back surface S Contact part

Claims (2)

[Claims] 1. A method for manufacturing a clay tile in which a formed tile body is dried and then fired in a self-supporting state, wherein the tile side of the dried tile body is stably and self-supporting. A method for producing a clay tile, characterized in that the contact portion is ground flat, the tile body is self-supported via the ground contact portion, and the self-standing tile body is fired. 2. The method for producing a clay tile according to claim 1, wherein the abutting portion on the tail side of the tile body is a projection.