JPH01126254A - Production of plate-shape ceramic molded body having spot resistance on visible side - Google Patents

Abstract

PURPOSE: To produce a plate-like ceramic molding having excellent in resistance to spotting on a visible side, by forming the compounded material of the molding into a silt state and applying a flowable film on the visible side of the molding before firing.

CONSTITUTION: The compounded material of the molding is formed into silt state by a ball mill. The silt-like material is imparted on the visible side of the molding before firing in such a manner that the flowable film having a thickness of 60 to 70 μ is formed. At this time, a liquefying agent is added to the compounded material during the time the material is made into the silt form and the material is frictionally crushed until the coarsest particles attain the grain size of a fraction of the coarsest particles of the compounded material of the molding. As a result, the planar ceramic molding which maintains the basic appearance in spite of the attrition of the surface of the fired molding and obviates the appearance of spots on the appearance is obtd.

COPYRIGHT: (C)1989,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for producing a molded body, in particular a plate-shaped body, which is spot-resistant on the visible side, from a fired ceramic material, and to a molded body produced by this method. .

<Prior art> Ceramic molded bodies, especially plate-shaped ceramic molded bodies, are coated with an engraving to protect them from wear and tear.
It is conventionally known to apply Engobe is a special clay with optionally added pigments for coloring ceramics and roof tiles by sintering.

It must be weather resistant, firmly bonded to the racemic body, and have the same coefficient of expansion as the ceramic body so that cracks are not likely to form. Therefore, special care is required in the selection of engobes.

The use of glazes, i.e. glassy substances consisting essentially of quartz, aluminum oxide (6 earth), alkalis, alkaline earths and low-melting oxides as fluxes, as a coating material for ceramic moldings, especially plate-shaped ceramic moldings. It has also been known for a long time that In this case, too, special care must be taken in selecting the corresponding shaft material so that cracks do not occur later on, so it is still timeless.

What these two coatings have in common is that the appearance of the ceramic molded body changes as the ceramic molded body is layered, so depending on the degree of layering, the relatively ugly and flat appearance changes. It will appear sooner or later.

This is all the more so because a tonal match between engravings or glazes and the ceramic substrate coated with them is difficult to achieve in practice.

<Problems to be Solved by the Invention> The purpose of the present invention is to eliminate this drawback and to create a fired ceramic that maintains its basic appearance and does not show spots even when the surface is laminated. The object of the invention is to provide a method for producing molded bodies, in particular plates, made of a material. The present invention is particularly useful where the appearance of unglazed ceramic bodies is desired but surface protection is required.

According to the present invention, this object is to apply a fluid film from the compound material of the molded body made into sand and slurry in a ball mill to the visible side of the molded body before firing. This is achieved by

<Example> This substance is applied using a conventional glaze spraying vessel. When a plate-shaped molded body is manufactured by extrusion molding, for example, the glaze sprayer is placed after the extrusion nozzle and at the latest in front of the point where the plate-shaped body enters the firing furnace.

Even if striped or spot-like color differences appear on the surface of a plate-shaped ceramic molded body when manufactured by extrusion molding, the application of a film from the compounded material of the molded body according to the present invention According to German Patent Publication No. 3201245, sufficient coverage is achieved so that no appearance irregularities appear even if the surface of the ceramic molded body thus formed is correspondingly affected by the layer stacking. According to
In connection with a method for producing unglazed tiles in a dry pressing process with the application of decorations to the surface, in which a suspension of decorations is applied before the end of the pressing process and is pressed together, German patent According to the method known from Publication No. 2,550,474, porphyry is used as a decoration, which is a transparent layer of essentially the same mineral composition as the base material, but due to its large grain size Particles are seen lined up together.

However, these known methods or the ceramic molded bodies produced by them are based on a problem completely different from that of the present invention. The problem of the present invention is to ensure that the appearance of the surface of the molded body does not change despite the unavoidable layer stacking on one surface, whereas the problem of the known manufacturing methods is to make it possible to create new surface shapes. Another way to do this is to enrich your decorative techniques. Whether or not a molded article whose surface is decorated in this way will have an ugly appearance due to layering has not been considered, nor has it been examined in detail.

It is also within the scope of the present invention to add liquefaction agents to the formulation that forms the coating during mud formation.

Preferably, the application is carried out so that the layer thickness of the coating is approximately 60-70 microns.

According to a preferred embodiment of the invention, the blended material to be made into a slurry is ground until its coarsest particles have a particle size that is a fraction of the coarsest particle of the blended material. In this case,
The molded body has an almost completely spot-free surface;
That is, unexpected stains are removed by the dye or by a similar colored substance without leaving behind any linear stains.

Patent applicant Buchtal Gesellschaft Mitsut.
Beshlenkter Hattrang

Claims (1)

[Scope of Claims] 1) A method for manufacturing a particularly plate-shaped molded body, which is spot-resistant on the visible side, from a fired ceramic material, in which a flowable film is formed from a compounded material of the molded body made into a sandy slurry in a ball mill. A manufacturing method characterized in that the material is applied to the visible side of the molded body before firing. 2) The manufacturing method according to claim 1, characterized in that a liquefaction agent is added to the blended material for forming the film during sanding. 3) The manufacturing method according to claim 1 or 2, characterized in that the coating is applied to a layer thickness of 60 to 70 microns. 4) The first aspect of the present invention is characterized in that the blended material to be made into sand and mud is ground until the coarsest particles thereof have a particle size that is a fraction of the coarsest particle of the blended material of the molded body. ~
The manufacturing method according to any one of Item 3. 5) A spot-resistant molded body, in particular a ceramic plate, produced according to the production method according to claims 1 to 4.