JPS6117993B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a porcelain tile having a water-absorbing layer on the back surface, and is a technology developed specifically for the purpose of improving the construction performance of porcelain interior tiles with frost damage resistance.

Porcelain tiles do not suffer from frost damage like ceramic tiles, and are a durable and highly decorative building material. However, the construction performance of porcelain tiles, which do not have a water-absorbing layer on the back side, was inferior to that of ceramic tiles, and improvements have been desired.

There is a method of applying a slurry to provide a ceramic layer with a water absorption layer on the back side of a porcelain tile, but the thickness of the ceramic layer is uneven and uneven, causing problems with the aesthetic appearance and workability of the back side of the tile. .

The present invention is characterized in that a paste of a ceramic raw material having a higher fire resistance than the tile raw material is screen printed on the back surface of a processed and molded tile made of a powder raw material or a tile obtained by biscuit firing the same, and the paste is fired. It is a porcelain tile with

If a ceramic raw material paste is printed using a screen printing method, a water-absorbing layer with a uniform and smooth thickness and an arbitrary pattern can be obtained.

Therefore, the porcelain tiles of the present invention are beautiful and easy to install, and when packed in large numbers with the front and back surfaces of the tiles in contact with each other,
The tile surface is not damaged due to the unevenness on the back side of the tile and can be easily packed. Furthermore, since the paste is screen printed, the paste does not scatter and adhere to the tile main surface or the glazed surface unlike the coating method, resulting in beautiful tiles.

Hereinafter, the porcelain tile of the present invention will be explained by taking the production of a porcelain interior tile as an example.

Powdered raw materials for porcelain tiles are pressure-molded using an automatic tile forming machine with the back side of the tile facing upwards, and then a conveyor connected to the forming machine is used to form the tile without any pattern on the back side of the tile. Ceramic raw material made into a paste with a CMC aqueous solution is printed in an arbitrary back pattern by screen printing on the back side of the tile fabric being transported with the back side of the tile with rounded edges facing up. Note that this ceramic raw material has a higher refractoriness than the tile raw material, and is used by pulverizing a refractory material that does not become porcelain at the porcelain-forming temperature of the tile but has a water-absorbing layer.

When this tile material is sintered until it becomes porcelain, the printed paste on the back of the tile becomes a ceramic layer with a water-absorbing layer depending on its fire resistance. In the glazing process, a glaze is applied to the surface of the fired tile body, and the tile is fired again.

The back side of the porcelain interior tile obtained by the above manufacturing method has a ceramic layer with a back pattern pattern that has a uniform and smooth thickness and has an appropriate water absorption layer. Even when applied to the entire concrete wall surface, there was little shearing due to the tiles' own weight, and the installation was extremely efficient. Good results were also obtained in the adhesive strength test after the cement mortar had hardened.

On the other hand, on the back side of the tile base, which has been baked until it becomes porcelain, a paste of a ceramic raw material that has a higher fire resistance than the tile raw material is screen printed, then reversed, a glaze is applied to the surface of the tile base, and then fired. As a result, a porcelain interior tile having an appropriate water absorption layer on the back surface was obtained. However, the adhesion of the ceramic water-absorbing layer to the back surface of the porcelain tile obtained by this method was slightly inferior to that of the above-mentioned method in which the tile material was directly printed and fired.

The present invention as described above is particularly useful for porcelain interior tiles, since it is difficult to form a relatively high back leg like porcelain exterior tiles due to the thinness of the ceramic water absorption layer. .

Claims (1)

[Claims] 1 Porcelain having a water-absorbing layer on the back surface, which is characterized in that a paste of a ceramic raw material having a higher fire resistance than the tile raw material is screen printed on the back surface of a pressure-molded tile made of a powder raw material or a tile obtained by biscuit firing the same, and then fired. quality tiles.