JPH05262587A - Production of decorative ceramic product - Google Patents

Abstract

PURPOSE:To prevent obscurity of the outline part of pattern and to make the part hardly foam in production of a ceramic product having a formed pattern on the surface of a glazed ceramic product. CONSTITUTION:In production of a ceramic product having a formed pattern on the surface by glazing the surface of a base of a burnt ceramic product, applying a coating material blended with frit, enamel or a natural raw material melting with the glaze or optionally paint besides the frit, etc., to the glazed surface and burning, the coating material is blended with fine powder material of refractory not to melt at the burning temperature.

Description

Detailed Description of the Invention

[0001]

This invention has a pattern on the surface.
The present invention relates to a method for manufacturing decorative ceramic products such as tiles and porcelain plates.

[0002]

2. Description of the Related Art Conventionally, in ceramic products such as tiles and porcelain plates, a pattern using paint, colored glaze, or frit is formed on the surface in order to improve the decorative property.

As a method for forming such a pattern, a screen is prepared by applying a glaze or a frit and a flux component containing a natural raw material which is easy to adapt, and a coating material obtained by adding a colorant to the glaze or the surface of the ceramic to the screen. printing,
There is known a method of applying by hand drawing, spraying or the like, and then firing in a firing kiln.

According to such a method, an arbitrary pattern can be formed, and since the coating material such as glaze is melt-mixed with the lower glaze previously applied, a pattern having a deep texture can be obtained. Can be formed.

[0005]

However, in this method, when the coating material such as glaze is melt-mixed with the lower glaze previously applied, the colorant contained is also melt-dispersed, and the pattern formed is formed. There is a problem that the boundary of is blurred. For this reason, in particular, it is impossible to obtain a clear contour or a delicate pattern by the above method. Furthermore, foaming easily occurs near the boundary of the pattern, which is a defect of the product.

An object of the present invention is to prevent blurring of the outline portion of a pattern in a method for manufacturing a ceramic product in which a pattern is formed on the surface of a ceramic product which is subjected to a lower glaze by using a colored glaze or paint. It is to provide a means for preventing foaming at a portion.

[0007]

According to the present invention, a lower glaze is applied to the surface of a base material of a baked ceramic product, and a frit, a glaze or a natural material or a paint on the lower glaze which is eutectic with the lower glaze. In the method for manufacturing a ceramic product in which a coating material having been added and mixed is applied and then fired to obtain a pattern on the surface, by adding a refractory fine powder material which does not melt at the firing temperature to the coating material, the above object was achieved. It is a thing.

As the lower glaze, a wide range of ordinary glazes such as Pb-based, MgO-based or BaO-based matte glaze, semi-matte glaze, bright glaze and semi-bright glaze can be used. Matte glaze, semi-matte glaze or semi-bright glaze can be preferably used in order to make the pattern appear more clearly by the action of the material.

Further, as a coating material for forming a pattern, F
A colored glaze containing various metal oxides such as e, Ni, Cr, Ti, and Co, or a paint composed of a pigment and a frit can be used. In order to melt-mix with the lower glaze, (K
Na) containing components such as O, B ₂ O ₃ and PbO is used.

The refractory fine powder may be inert as long as it does not melt at the firing temperature. For example, the average particle size of aluminum hydroxide, alumina, zirconium oxide, zircon, titanium dioxide, aluminum titanate, spinel, etc. Those having a thickness of 0.5 to 20 μm, preferably 1 to 10 μm can be suitably used. Such a particle size enhances the dispersion effect in the whole material, and when it exceeds 20 μm, it remains as refractory particles during firing, which adversely affects the surface or becomes visible as white spots, resulting in product defects. This is because. The content of the refractory fine powder in the coating material is 2 to 30% by weight, preferably 5 to 20% by weight, so that the contour of the pattern can be more clearly revealed. In this case, 2
If it is less than 30% by weight, the effect is not clearly recognized, and if it exceeds 30% by weight, the surface texture of the pattern is adversely affected.

[0011]

[Function] Although it has not been theoretically clarified that the refractory fine powder material clearly reveals the contour of the pattern and that foaming in the vicinity of the contour is less likely to occur, it does not melt at the temperature during firing. The presence of inactive particles means that a low-fluidity system exists in the molten material, which suppresses mutual diffusion due to eutectic melting of the lower glaze and the coating material, and exudes the outline of the pattern. Is supposed to prevent.

[0012]

Example: Porcelain stone 50% by weight, limestone 20% by weight, clay 3
On the surface of the tile base material, 0 wt% of the mixed soil was pressed into a flat plate of 200 × 200 × 7 mm and fired at 1180 ° C. for 12 hours, 5 parts by weight of pigment, 25 parts by weight of feldspar, 10 parts by weight of clay, silica stone 5 parts by weight, zircon 15 parts by weight, talc 10
Parts by weight, CaCO ₃ 10 parts by weight, BaCO ₃ 5 parts by weight,
0.4m of semi-matte glaze consisting of 50 parts by weight of fritt
It was applied in a thickness of m to form a lower glaze layer.

Next, a screen (120
85 parts by weight of frit, 15 parts by weight of feldspar, 5 parts by weight of clay, and an average particle size of 2 manufactured by Showa Denko Co., Ltd.
Printing was performed on the lower glaze layer with a transfer ink composed of 15 parts by weight of powdered alumina (AL-170) having a size of μm and 60 parts by weight of glycerin, and baking was performed at 1150 ° C. for 1 hour and 15 minutes with a roller hearth kiln. As a result, a tile having a clear contour line in which no blur was seen in the contour of the floral pattern was obtained. In addition, no pinhole was observed near the boundary between the coating material and the lower glaze.

[0014]

As described above, according to the manufacturing method of the present invention, the refractory fine powder material which is inactive at the firing temperature is added to the coating material for pattern formation applied on the lower glaze. by this,
It is possible to obtain a ceramic product which has a clear contour line without bleeding in the contour of the pattern and has a deep texture in which pinholes due to foaming are not seen near the contour of the pattern.

Claims (3)

[Claims] 1. A lower glaze is applied to the surface of a base material of a baked ceramic product, and a frit, a glaze or a natural raw material which is eutectic with the lower glaze, or a coating material to which a paint is added and mixed is applied onto the lower glaze. In the method for manufacturing a ceramic product which is then fired to obtain a pattern on the surface, a refractory fine powder material that does not melt at the firing temperature is added to the coating material. 2. The content of the refractory fine powder material according to claim 1,
A method for producing a decorative ceramic product, which is 2 to 30% by weight of the coating material. 3. The refractory fine powder material according to claim 1, comprising aluminum hydroxide, alumina, zirconium oxide, zircon,
A method for producing a decorative ceramic product, which is any one of titanium dioxide, aluminum titanate, and spinel and has an average particle diameter of 0.5 to 20 μm.