JPH03293464A - Formation of yo-hen decoration on surface of ceramic product - Google Patents

Abstract

PURPOSE:To provide the surface pattern of a ceramic product of a 'yo-hen' pattern heretofore not produced by a method wherein, after a glaze of components having different softening and yield points and thermal expansion factors or an inorganic pigment or a colorant, e.g. a metallic oxide, is applied in a piled up state, baking is effected. CONSTITUTION:A base glaze is applied on a tile 1 ground, 100wt.% a flit glaze having a composition of boro-silicated lead is uniformly applied as a first layer on a flat tile 1 surface by screen printing. 90wt.% a flit glaze having a composition of silicated lead and 10wt.% a blue pigment are glazed as a second layer on a central part on the first layer 2 by a screen printing. Glazing is further applied in a roller hearth kiln in oxidizing atmosphere for a given time at a high temperature. A base glaze part 2 of the first layer produces a uniform white glaze, a 'yo-hen' pattern part 3 of the second layer assumes a particular color tone of a light shade of blue color, and a surface pattern having an infinite number of cracks 4 is formed therein.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for forming surface patterns and color tones by glazing the glaze applied to the surface of ceramic products such as various sanitary ware, tiles, and ceramic plates. This paper relates to the so-called kiln transformation method for forming subtle speckled patterns, striped patterns, etc.

[Conventional technology]

Techniques for obtaining unique designs such as spots and stripes on the surface of ceramic products include giving the surface shape to the base material itself,
Kiln-changed glazes utilize firing chemical reactions such as multi-colored layering of glazes, oxidation/reduction reactions of metal oxides, and crystal precipitation, or printing or transfer of desired patterns/pattern designs onto the base/glaze surface. There are ways to decorate it.

[Problem to be solved by the invention]

This kiln modified glaze decoration targets the entire surface or large area of the substrate by dipping or spraying, making it difficult to obtain detailed pattern designs in areas like printing. There are limits to the types of patterns, it is not possible to obtain the desired kiln-changing effect, and it is not possible to respond to the diversification of tastes.

An object of the present invention is to obtain a surface pattern of a ceramic product with an unprecedented kiln modulation.

[Means to solve the problem]

The method for converting ceramic products in a kiln according to the present invention is characterized in that glazes having different softening yield points and coefficients of thermal expansion, or coloring agents such as inorganic pigments or metal oxides are applied in layers and then fired. .

In addition, glazes or coloring agents having different softening yield points and thermal expansion coefficients may be layered thinly and uniformly by screen printing, offset printing, letterpress printing, etc., and any printing method can be applied uniformly. An ink layer of arbitrary thickness can be obtained.

Thermal physical properties such as softening yield point and thermal expansion coefficient are particularly important when the softening yield point differs by 90"C or more (also, if the thermal expansion coefficient differs by more than 0.2xlQ-6cm/cm/ Streak patterns such as cracks and cuts are clearly formed.

Moreover, the cracks, cuts, etc. can be controlled and adjusted as desired by the thickness of the applied glaze or coloring agent, or in combination with the thermal and physical properties of the underlying glaze to be compared.

Glazes or colorants having different softening yield points and coefficients of thermal expansion may be applied directly to the base surface of the ceramic product, or may be applied onto the base glaze.

Furthermore, the glaze or coloring agent is not limited to two layers.
The coating may be applied in multiple layers of three or more.

[Effect]

By layering glazes that have different thermal and physical properties during heating and cooling, such as softening yield points and coefficients of thermal expansion, it is possible to create speckled patterns. By increasing their size, they can form surface patterns with subtle cracks or streaks such as cuts.

〔Example〕

A base glaze is applied to the tile base, and a first layer (lower layer) is made of 95% by weight of flux and 5% by weight of NZ cocoa, with a softening yield point of 480°C and a coefficient of thermal expansion of 6.5.
xlo-' cm/cm/t of flux and 100% by weight of a frit glaze having a composition of lead borosilicate was applied to the entire flat tile surface by screen printing at 20% by screen printing.
It was applied uniformly to a thickness of μm. Furthermore, the second layer (upper layer) consists of 80% by weight of flux and 20% by weight of pigment, with a softening yield point of 383°C and a coefficient of thermal expansion of 10.3 x 10-
＠cm/cm/'C frankste, 90% by weight of frit glaze having a composition of lead silicate and 10% by weight of blue pigment were experimentally applied to the center of the first layer (lower layer) for approximately 10% by weight.
A circular shape with a diameter of 0 mm was uniformly glazed to a thickness of 20 μm by screen printing.

This was heated in a roller hearth kiln in an oxidizing atmosphere for 1200
When the glaze was fired at ℃ for 37 minutes, a kiln-shaped pattern having the surface pattern shown in FIG. 1 was obtained. Referring to the same figure, the lower glaze part of the first layer (lower layer) indicated as 2 is occupied by the white glaze, and the kiln-shaped pattern part of the second layer (upper layer) indicated as 3 is light blue. It has a unique color tone, and there are countless cracks in it.
It had a The kiln pattern part 3, which was experimentally applied in a circular shape to the center of the tile, has good adhesion to the lower glaze part 1, and there is no possibility of it peeling off at the cracks 4, and the surface is polar and smooth. The glaze pattern fired in the process was perfect.

[Effect of Hathu]

The present invention can achieve the following effects.

(1) The pattern formed is one in which streaks and spot patterns such as cracks and cuts are actively formed, and as such, it is possible to obtain a product with a new kiln modulation pattern that is not found in conventional industrial ceramic products. Can be done.

(2) By utilizing physical and chemical reactions during the firing process, products with desired kiln-modulated patterns can be obtained even with thin ink and glaze layers, and rapid firing is possible.

(3) By using the transfer paper method, it is applicable not only to tile-like flat parts but also to curved surfaces and uneven substrates.

(4) Even in the ink/glaze layer, it is possible to obtain kiln-modulated pattern design such as spotted patterns and striped patterns.

[Brief explanation of drawings]

FIG. 1 shows an example of a surface pattern formed by applying the method according to an embodiment of the present invention to a tile base on a trial basis. 1: Tile 2: Lower glaze part of the first layer (lower layer) 3: Kiln irregular pattern part of the second layer (upper N) 4: Countless cracks

Claims (1)

[Claims] 1. Creation of kiln-shaped decorations on the surface of ceramic products, which is characterized by applying glazes with different softening yield points and coefficients of thermal expansion, or coloring agents such as inorganic pigments or metal oxides in layers and then firing them. Method.