DE19948917C1 - Process for lifting decorative structures on at least scalded ceramics and use of a blasting device - Google Patents

Abstract

The ceramic workpiece is first scoured (firing at 900 DEG -960 DEG). Now the surface is covered at the points of the desired decor structure. This is done by the following measures: DOLLAR A 1. hot wax, or media immersed in hot wax, DOLLAR A 2. self-adhesive films and other self-adhesive materials, DOLLAR A 3. stronger papers of all types with the help of adhesives or natural rubber milk, DOLLAR A 4. Sheets, sheets with embedded motifs, DOLLAR A 5. coated materials. DOLLAR A The ceramic shards can now be excavated using radiation. Blasting is carried out using conventional blasting devices, blasting media and devices. DOLLAR A In order not to "shoot" a workpiece, backlighting or interior lighting is used to determine and control the remaining cullet thickness when blasting. DOLLAR A After blasting, the masking media are removed. The procedure can be repeated. Then you can proceed with glazing, engobing, smooth firing etc. in the usual way.

Description

The invention relates to a method for lifting decorative structures on the Surface of at least scalded ceramics, mainly porcelain.

As is known, decorative structures on surfaces of ceramics, mainly porcelain workpieces, made in leather-hard condition. this happens by covering the desired decor structure with shellac or rubber milk on the leather-hard shards, and washing out the uncovered Surfaces with water. The body partially softens and there is Danger that too much water will dissolve and deform the ceramic. The The workpiece is then lost. With the covering agents shellac and rubber milk only a limited type of decorative structure can be created.

DD 229 859 A1 describes a process for finishing, among other things Ceramics known, in which on the ceramic a sandblast-resistant Screen printing agent applied and dried at 200 ° C. Then will the respective article is sandblasted in a closed system and subsequently the decoration agent removed.

DE 28 38 919 A1 also describes a method for producing a decor on the surface of ceramics, here ceramic plates, under application of the  Surface with sand or similar rays, taking direction and / or intensity the or the sandblasting are programmed to be changed.

With the methods described last it can happen that in particular filigree products are "shot" by blasting.

The invention specified in claim 1 is based on the task economical way a much greater variety of decor structures with before allow definable shape and depth.

This object is achieved by the in claim 1 labeled means solved.

Ceramic products are at least subject to fire, which means that molded product is irreversibly transformed into a solid product that is against Water is resistant. Unglazed goods are usually only fired once. Glazed products are usually fired twice. First the Scalding, in which - with the exception of hard porcelain - the broken pieces becomes.

The invention is based on the exploitation of the fact that the fragments first boiled (firing at 900 ° -960 ° C), some Has breaking strength and does not dissolve under the influence of water.

In order to obtain decorative structures on the surface, the surface becomes partial covered. The covered areas initially remain untreated. By the Covering is created later by lifting three-dimensional decorative structures. A structure can be created in both positive and negative.  

Various techniques are available for covering:

• 1. hot wax, or media immersed in hot wax,
• 2. self-adhesive films and other self-adhesive materials,
• 3. thicker papers of all kinds with the help of adhesives or natural rubber milk,
• 4. Sheets, sheets with embedded motifs,
• 5. coated materials.

The structure-forming materials under 4 + 5 can both with the workpiece be adhered, as well as being freely movable in front of it.

After covering the ceramic workpiece, the body can now be removed from the free one Places are highlighted using radiation. The are helpful here Control of the direction of radiation and / or the speed of the blasting medium and / or the composition of the abrasive and / or the particle size of the Blasting agent and / or the fineness of the nozzle jet and / or the jet angle of the Nozzle to workpiece. Depending on the desired decor structure, you can use these Variables can be worked freely.

The workpieces are preferably blasted in the booths so work requirements, such as B. the size of the workpieces required Brackets or support options and the like, meet.

Around the ceramic workpiece before the possible "shooting" by blasting to preserve, the invention now provides for the ceramic workpiece by a strong light source from behind or inside to illuminate the remaining one To be able to see the body thickness of the workpiece.

After the decorative structures have been removed, the covering media are removed. The This process can be used several times to create more decor patterns receive.  

You can then work in the usual way with glazing, engobing, Smooth fire etc. can be continued.

Claims (1)

Process for lifting decorative structures from the surface of screeded or fired ceramic workpieces using a blasting device with the aid of known blasting agents, in which the workpiece surface to be blasted is covered with media loosely or loosely at the locations of the desired decorative structures before the radiation begins and by control

• - the direction of radiation
• - And / or the speed of the abrasive
• - And / or the composition of the abrasive
• - And / or the particle size of the abrasive
• - And / or the fineness of the jet
• - And / or the jet angle of the nozzle to the workpiece

the decorative structure is highlighted precisely in three dimensions, characterized in that the remaining body thickness of the workpiece surface to be machined is checked with the aid of backlighting.