JPH05262582A - Production of decorative ceramic - Google Patents

Abstract

PURPOSE:To form a relief-like glaze layer having an optionally regulated thickness on the surface of a ceramic. CONSTITUTION:The surface of a substrate which is a ceramic is partially coated with a water absorption rate modifier to form a part having a different water absorption rate in glazing. The surface of the substrate is then glazed to form a glaze layer of an uneven shape, which is then burned. Thereby, water in the glaze to be applied is absorbed in the substrate and the glaze readily sticks in a part uncoated with the water absorption rate modifier. In contrast to this, since the water in the glaze to be applied is hardly absorbed, the glaze hardly sticks and the thickness is reduced in the part coated with the water absorption rate modifier. As a result, an uneven glaze layer is formed.

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 decorative ceramic product such as a tile or a porcelain plate, and more particularly to a method for manufacturing a decorative ceramic product having an arbitrary uneven pattern on the surface of a base material.

[0002]

2. Description of the Related Art Conventionally, for example, an uneven pattern made of glaze is formed on the surface of a base material of a tile, and thereby an excellent design effect can be obtained. Also, like celadon glaze, coloring caused by the difference in the thickness of the glaze layer is achieved. By using the difference of, it is performed to obtain a variety of color tones.

As a method for manufacturing such a tile, there is known a method in which an uneven pattern is formed in advance on a mold and a glaze is applied on the uneven pattern to form unevenness on the tile surface.

According to this method, a desired uneven shape can be surely obtained, but since a mold having an uneven pattern is required for each product, the cost is high for a small quantity. Not suitable.

Another method is to obtain a relief pattern on the glaze surface of the product by sandblasting or the like, but the processing cost is high.

As a solution to such a drawback, in JP-A-55-14519, a water-repellent water-absorption preventing liquid is applied to an arbitrary position on the surface of a base material and then a glaze-like glaze is applied to the entire surface. Then, a method of forming a concavo-convex pattern by a so-called strong water repellent technique is disclosed in which the glaze in the water absorption preventing liquid portion is washed away by washing this surface with water.

[0007]

However, in the above method, since the glaze applied on the water repellent agent is completely washed away, the glaze is divided into a portion with and without a glaze.
It is difficult to form a relief surface in which the thickness of the glaze layer is subtly changed.

The problem to be solved by the present invention is to obtain a means capable of forming a relief-shaped glaze layer having an arbitrarily adjusted thickness on the surface of a ceramic product by a relatively simple method.

[0009]

According to the present invention, a water absorption rate adjusting agent is partially applied to the surface of a base material of a ceramic product, and the base material surface is provided with a portion having a different water absorption speed during glaze. The above problem is solved by applying glaze on the surface of a base material to form a glaze layer having an uneven shape and then firing. As the glaze, not only opaque glaze but also colored transparent glaze may be used.

The water absorption rate adjusting agent has a function of slowing the absorption rate of water in the glaze to be applied or suppressing the water absorption ability, and triethanolamine (TE).
A), polyvinyl alcohol (PVA), aqueous resin such as carboxymethyl cellulose (CMC), water-based resin of acrylic emulsion, alcohols such as ethyl alcohol and ethylene glycol, or water can be used. In particular, the absorption rate can be adjusted by appropriately adjusting the concentration.

These water-absorption rate adjusting agents are applied to the portion where the glaze layer on the surface of the ceramic product base is thinned by a glaze method such as spraying with a spray or a slap of a centrifugal method, or a method such as printing or writing. Apply.

On this base material, curtains, sprays, prints,
Glazed by a technique such as brush writing. As a result, the glaze layer in the portion coated with the water absorption speed adjusting agent becomes thin, and the uneven glaze layer is formed on the surface of the base material. Any glaze can be used as the glaze, but Fe, C
A colored glaze containing various metal oxides or pigments such as r, Ni, Ti, Al, Ca and Co can be preferably used.

The degree of unevenness, that is, the amount of glaze deposited or the thickness can be arbitrarily adjusted by the following method. One method is a method of adjusting the amount of the water absorption speed adjusting agent applied to the substrate. For example, in the case of screen printing, if the mesh of the screen gauze to be used is made coarse, the amount of the absorption rate adjusting agent is increased, and if it is made fine, it is decreased. The other method is a method of adjusting the volatilization and drying ability of the water absorption rate adjusting agent applied to the substrate. For example, the mixing ratio of high boiling point (boiling point 197 ° C) alcohol such as ethylene glycol and water is controlled. By increasing the mixing ratio of ethylene glycol, the water absorption capacity of the substrate can be reduced and the glazed layer can be thinned.

The product having the uneven glaze layer is formed by a firing kiln such as a tunnel kiln or a roller hearth kiln.
1150 to 1300 ° C, preferably 1200 to 125
Bake at 0 ° C.

[0015]

[Function] In the part where the water absorption rate adjusting agent is not applied, the water content of the glaze applied is absorbed by the base material and the glaze tends to adhere to it, whereas in the part where the water absorption rate adjusting agent is applied, the water content of the glaze applied is increased. Since the glaze is not easily absorbed, the glaze is less likely to adhere and becomes thinner, and an uneven glaze layer is formed as a whole.

[0016]

【Example】

Example 1 A raw material powder consisting of 50 parts by weight of porcelain stone, 20 parts by weight of limestone, and 30 parts by weight of clay was press-molded into 200 × 200 × 7 mm, and this was subjected to 24 at 1150 ° C. in a tunnel kiln.
The tile base material was molded by firing for a time.

A 50% TEA aqueous solution was partially applied onto the base material by a printing method using a stainless 80 mesh screen.

Next, a glaze having a composition of 60 parts by weight of frit, 30 parts by weight of feldspar, 15 parts by weight of kaolin, and 10 parts by weight of zircon was evenly applied to the entire surface of the tile base material by a curtaining method so as to have a thickness of 600 μm. did. As a result, a smooth concave portion was formed in the portion coated with the TEA solution, the thickness of the glaze layer at the bottom thereof was 200 μm, and an uneven glaze layer was formed on the tile base material surface.

Using a roller hearth kiln, 11
It was baked at 00 ° C for 1 hour.

As a result, a relief-like tile having a gently changing surface was obtained.

Example 2 Further, using a transparent glaze having a composition of 60 parts by weight of frit, 30 parts by weight of feldspar, 10 parts by weight of kaolin, 1 part by weight of cobalt oxide, and 4 parts by weight of copper oxide, a celadon color was developed. A tile was obtained in the same manner as in Example 1.

As a result, a tile having a relief surface and a variety of color tones was obtained by utilizing the change in the thickness of the transparent glaze layer.

[0023]

【The invention's effect】

(1) Since the thickness of the glaze layer on the surface of the base material of the ceramic product can be arbitrarily adjusted, a relief tile in which the thickness of the glaze layer is freely changed can be obtained.

(2) Since it is only necessary to apply the water absorption speed adjusting agent to an arbitrary position before glaze, a decorative ceramic product having a relief surface can be easily obtained at low cost.

(3) Since the thickness of the transparent glaze layer on the surface of the base material of the ceramic product can be arbitrarily adjusted, the color tone change depending on the thickness of the transparent glaze layer can be freely set.

Claims (2)

[Claims] 1. A method for manufacturing a ceramic product, comprising forming a glaze layer by applying glaze to a surface of a base material of the ceramic product, and then firing.
Prior to the glaze step, a method for producing a decorative ceramic product, wherein a water absorption rate adjusting agent that delays the water absorption rate during glaze is partially applied to the surface of the base material. 2. A method for producing a decorative ceramic product, wherein the glaze according to claim 1 is performed by using a colored transparent glaze.