JPH08108419A - Back die for molding relief tile - Google Patents

Abstract

PURPOSE: To provide a back die for molding relief tile wherein, even when the filling amount of body is uneven, the filling density can be made even, and the tiles uniform in thickness can be produced. CONSTITUTION: A recess part 12 is formed in the molding surface of a back die 1 for molding relief tile and, in the recess part 12, a gellike substance 13 or a gellike substance 13 sealed with sheet is provided in the recess part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when manufacturing a relief tile having a relief pattern formed on a tile surface, is provided with a gel-like substance on the molding surface of a back mold, so that the relief pattern is not affected by the relief pattern. The present invention relates to a back mold that can make the packing density of the entire tile uniform under pressure without pressure.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, a relief tile is formed by filling a molding space 3 formed by a back mold 1 and a frame mold 2 which form the back surface of the tile with a clay 4 or the like. Unevenness 5 for forming a relief pattern tile surface
As shown in FIG. 8, the front mold 6 provided with is lowered to press the kneaded clay 4 to obtain a tile molded body. Then, the pressed tile molded body is taken out, unglazed if necessary, and then, a tile as a product is manufactured through steps such as glazing and firing.

Since the tile is made by firing the ceramic raw material, the thermal expansion and contraction accompanying the firing are large, and it is extremely difficult to control the dimensional accuracy. The factor that most affects the dimensional accuracy is the packing density of the raw material after pressure molding. However, in the relief tile molding die, due to the unevenness of the relief pattern of the front die 6, a portion compressed to the dimension H and a portion compressed to the dimension h are formed, and the filling density after the pressure molding is unsatisfactory. It had the drawback of producing uniformity.

As a means for solving such non-uniformity of the packing density after pressure molding, the technique shown in FIG. 9 is conventionally known. In this conventional technique, a hydrostatic chamber 8 sealed with a rubber 7 is formed on the molding surface of the back mold 1, and a fluid 9 is put in the hydrostatic chamber 8.

In this conventional technique, for example, uneven pressure 5 tends to be generated on the kneaded clay 4 due to the unevenness 5 of the front mold 6 at the time of pressure molding, but the back mold 1 for molding the back side of the tile 1 The uniform hydrostatic pressure is generated in the fluid 9 in the hydrostatic chamber 8, and as a result, a uniform pressing force acts on the entire kneaded clay 4. Therefore, FIG. 10 obtained in this way
The filling density of the tile molded body 10 shown in 1 is uniform throughout, and the dimensional accuracy of the vertical and horizontal sizes due to the thermal expansion and contraction of the tile is improved.

[0006]

However, according to the pressure molding method of the relief tile utilizing the hydrostatic pressure of the hydrostatic chamber 8, the powder granules or the like are formed when the molding space 3 is filled with the clay granules or the like. In the initial state of filling, which is approaching the space 3, the kneaded clay 4 is aggregated into a nodule and dropped into the molding space 3 and supplied. Therefore, the rubber 7 of the hydrostatic chamber 8 corresponding to the portion remains recessed as shown by the chain line in FIG. This is because the back side of the rubber 7 is completely free by the hydrostatic chamber 8.

Therefore, the filling amount of the kneaded clay 4 becomes uneven.
Even if the kneaded clay 4 is nonuniform, the pressing force becomes uniform over the whole due to the action of the hydrostatic chamber 8, but the size becomes nonuniform in the thickness direction of the tile as shown in FIG. There was a drawback. That is, there is a problem that the entire back surface of the tile has a shape that is obliquely deformed. . In short, in the above-mentioned prior art, the uneven filling amount of the kneaded clay 4 was absorbed by changing the thickness of the tile to sacrifice the thickness dimension, and the filling density was made uniform.

Accordingly, the work of attaching tiles having different thicknesses shown in FIG. 10 is performed by pressing the back surface of the tile, which has been transformed into the mortar coated with a uniform thickness, so that there is a portion where the mortar is insufficient in the same tile. Part and occurs,
Since it has to be done while replenishing the mortar and the like, there is a drawback that it is a very difficult work. In addition, the embedded depth of the tile may differ depending on the deformed portion, air pockets may be formed, and the like, and thus there is a drawback that the adhesive strength of the tile also varies.

[0009]

SUMMARY OF THE INVENTION The present invention has been made by improving the above-mentioned problems in view of the above-mentioned problems, and can make the packing density uniform even if the amount of the kneaded clay is uneven, and An object of the present invention is to provide a back mold for forming a relief tile capable of producing a tile having no thickness variation.

In order to solve the above-mentioned problems, the means of claim 1 adopted by the present invention is to provide a recess on the molding surface of the back mold for molding the relief tile, and dispose the gel-like substance in the recess. This is a back mold for forming a relief tile, which is characterized in that

According to the second aspect of the present invention,
The back mold for relief tile molding is characterized in that a recess is provided on the molding surface of a back mold for relief tile molding, and a gel material sealed with a sheet is disposed in the recess.

[0012]

In the means of claim 1 of the present invention, the gel-like substance is disposed in the recess provided in the molding surface of the back mold. The gel-like substance has a property of returning to its original shape and undergoes so-called elastic deformation. Therefore, a larger amount of kneaded material than the initially planned filling amount of kneaded material is dropped, and even if uniform filling is performed thereafter, the gel-like substance in the part of the kneaded material that has dropped in large quantities is temporarily After the dent, it recovers to its original state and eliminates the variation in the filling amount of the kneaded clay.

In addition, the gel-like substance tends to act on the kneaded clay unevenly due to the unevenness of the front mold for forming the relief pattern. The substance deforms corresponding to the relief pattern unevenness and absorbs the uneven pressure. Therefore, the tile molded body obtained after pressure molding has a uniform packing density.
Therefore, in the relief tile formed by using the back mold of the present invention, a tile having excellent dimensional accuracy of the tile, no deformation in the thickness direction of the entire tile, easy bonding work, and uniform bonding strength can be obtained. It is possible to manufacture.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of the present invention will be described below with reference to the embodiments shown in the drawings. The same reference numerals as in the conventional case are the same members. FIG. 1 is a vertical sectional view showing a molding die 11 according to a first embodiment of the present invention. As shown in the figure, in this embodiment, a recess 12 is formed in the molding surface of the back mold 1, and the gel substance 13 is disposed in the recess. As the gel-like substance, there are Elastcoat 3757,3500 series manufactured by Polyurethane Chemicals Co., Ltd. or its equivalent (including urethane rubber).

For example, the gel-like substance 13 made of Elastocoat 3757 manufactured by Polyurethane Kasei Co., Ltd. has elasticity to return to its original state, and is used as a playground equipment for jumps for kindergarten children and the like. In the molding die 11 in which the gel-like substance 13 having such a property is disposed in the molding surface concave portion 12 of the back mold 1, a large amount of kneaded material is dropped at a dash than the initially planned filling amount of the kneaded material 4. However, when the scheduled uniform filling is performed thereafter, the gel-like substance 13 in the portion where a large amount of kneaded material has dropped at once is temporarily dented, but thereafter restores to its original state.

The above-mentioned behavior of the gel-like substance 13 is dented by the drop supply of the kneaded material in an amount larger than the planned filling amount when the dust container advances, and returns to the original state when the dust container retracts. Therefore, the kneaded material that has been dropped and supplied in a larger amount than the planned filling amount comes to be scraped off due to the backward movement of the dust container due to the return of the gel material 13, and the kneaded material filling amount. Is uniform throughout.

Further, the gel-like substance 13 tends to exert a non-uniform pressure on the kneaded clay 4 due to the uneven portion 5 of the front mold 6 for forming the relief pattern. However, the gel-like substance 13 on the molding surface of the back mold 1 is deformed corresponding to the uneven portions 5 of the relief pattern to absorb the uneven pressure.

Therefore, the tile molded body obtained after pressure molding has a uniform packing density. Therefore,
In the relief tile formed by using the back mold 1 of this example, a product having excellent tile dimensional accuracy, no deformation in the thickness direction of the tile as a whole, easy bonding work and uniform bonding strength is manufactured. It is possible to

2 to 6 show molding dies 14 to 17 according to second to fifth embodiments of the present invention. Figure 2
In the molding die 14 of the second embodiment shown in (1), the concavo-convex portion 18 for forming the back foot is formed on the upper surface side of the gel-like substance 13. Further, in the molding die 15 of the third embodiment shown in FIG. 3, a rubber 20 having an uneven portion 19 for forming a back foot is arranged on the upper surface side of the gel substance 13. Further, in the molding die 16 of the fourth embodiment shown in FIG. 4, the gel material 13 is enclosed in the rubber 21, and the gel material 13 is cut off during pressure molding, or is eaten from between the molding dies. I try not to come out.

Furthermore, the molding die 17 of the fifth embodiment shown in FIGS. 5 and 6 has a recess 12 formed in the molding surface of the back mold 1.
Lattice-shaped legs 22 are installed in the space, and the gel-like substance 13 is arranged in a region defined by the grid-shaped legs 22. The leg 22 is set to be slightly lower than the height of the gel-like substance 13. This is to prevent firing strain and other defects by providing parallel portions on the back surface of the tile molded body obtained after pressure molding.

The other basic constitutions of the second to fifth embodiments and the action and effect of the gel material 13 are as follows.
This is the same as in the first embodiment. By the way, the present invention is not limited to the above-described embodiments, and for example, the relief pattern can be appropriately changed. Further, as the gel substance, as described above, members such as general resin and urethane rubber can be applied.

[0022]

As described above, according to the present invention,
Since the gel-like substance is arranged in the concave portion provided on the molding surface of the back mold, the gel-like substance is After that, although it is dented, it can be restored to the original state and the variation in the filling amount of the kneaded clay can be eliminated.

Further, although the gel-like substance tends to exert a non-uniform pressure force on the kneaded clay due to the unevenness of the front mold for forming the relief pattern, the gel-like substance on the molding surface of the back mold The substance deforms corresponding to the relief pattern unevenness and absorbs the uneven pressure. Therefore, the tile molded body obtained after pressure molding has a uniform packing density.
Therefore, it is possible to manufacture a tile that has excellent tile dimensional accuracy, is not deformed in the thickness direction of the tile as a whole, and has an easy adhesive work and a uniform adhesive strength.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a molding die according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a molding die according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view showing a molding die according to a third embodiment of the present invention.

FIG. 4 is a vertical sectional view of a molding die according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view of a back mold according to a fifth embodiment of the present invention.

FIG. 6 is a vertical sectional view of a back mold according to a fifth embodiment of the present invention.

FIG. 7 is a vertical sectional view showing a conventional molding die.

FIG. 8 is a vertical cross-sectional view showing a state of a conventional molding die under pressure.

FIG. 9 is a vertical cross-sectional view showing another conventional molding die.

FIG. 10 is a vertical sectional view of a relief tile formed by a conventional forming die.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Back mold 2 ... Frame mold 3 ... Molding space 4 ... Kneaded clay 5 ... Uneven portion 6 ... Front mold 11 ... Molding die 12 ... Recessed portion 13 ... Gel-like substance

Claims (2)

[Claims] 1. A back mold for forming a relief tile, characterized in that a recess is provided on a molding surface of a back mold for forming a relief tile, and a gel substance is disposed in the recess. 2. A back mold for forming a relief tile, characterized in that a recess is provided in the molding surface of a back mold for forming a relief tile, and a gel substance sealed with a sheet is disposed in the recess.