DE1249149B - Process for making decorations for porcelain, earthenware, majolica, enamel ware, and the like - Google Patents

Description

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^ - ^ FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int.Cl .:

C04b

German class: 80 b-23/02

Number: 1 249 149

File number: A 46573 VI b / 80 b

Filing date: July 13, 1964

Opened on August 31, 1967

41

Room -4-

For the mass decoration of porcelain, earthenware, majolica, enamel goods and the like. Are mainly Slider decals used. As a carrier for colored printing, screen printing, etc. serve with a water-soluble Coated special papers, foils or even textiles. The water-soluble line that is Located on these carriers is usually made of dextrin or polyvinyl alcohol.

In the production of ceramic decals, the process is such that the ceramic Enamel colors are first printed on the special paper provided with a water-soluble coating will. A so-called lacquer mask is then usually printed on the printed image using the screen printing process, which covers the whole picture to be transmitted. When transferring to the one to be decorated The object must first be soaked in this sliding image. The water-soluble line comes off on the backing paper, and the image can now be transferred to the object. It takes over the lacquer mask has the function of supporting the image and lies over the image on the object.

In this known method, it is essential to use special papers with a water-soluble Stroke and water these images onto the subject before transferring them. In the Surface decoration of pre-fired porcelain, earthenware, majolica, enamel goods and the like disturbs the proportion of water brought onto the object as a result of transferred residues of dextrin can leave a deposit on the glaze of the ceramic object after firing. So far, however, great difficulties have arisen from that which is brought onto the object by the decals Water content, especially in the underglaze decoration of not pre-fired porcelain, earthenware and majolica goods and in the production of single-fire decorations on enamel goods.

In the manufacture of underglaze decorations on porcelain, earthenware and majolica goods, the Underglaze decals applied to the pre-dried objects before the glaze firing. Since the pre-dried porcelain, earthenware and majolica goods eager for the water content of the decals suck up, but not in the places where the objects are stuck with decals be able to release more in sufficient quantities, burning difficulties arise here due to the formation of bubbles, caused by the enclosed water.

The glazes used for enamel goods are in many cases more sensitive to water in terms of their composition and must be used in a process to create the decoration before the enamel is fired
for porcelain, earthenware, majolica,
Enamel goods and the like

Applicant:

J. Albrecht, Mainz, Wallaustr. 33;
F. Xaver Leipold,
Zirndorf via Nuremberg, Österreicher Str. 20

Named as inventor:
Karl-Heinz Kluge, Mainz-Gonsenheim;
Alfred Eppich, Zirndorf

must be pre-dried very carefully. The application

Ao generation of wet decals is therefore not possible with many such enamel glazes.

The invention has now set itself the task of finding a method according to which the transfer of decorative images on porcelain, earthenware, majolica and enamel goods in a simple and becomes possible in a rational manner, without the need for watering, as is the case with the conventional sliding picture is.

According to the invention the object was achieved in that the transfer of ceramic Self-adhesive pictures on pre-fired or unfired glazes in a dry way using a Adhesive takes place, on a backing paper or on the usual, provided with a dextrin line Decal paper an elastic after drying Skin-forming pre-printing varnish as a carrier of the decoration applied with ceramic enamel inks is printed, whereupon a self-adhesive adhesive is applied to the image and preprint varnish and this is covered with a special paper, which when transferring the image without watering beforehand is deducted.

Self-adhesive images, also known as dry transfers, are used to identify and label Machines and utensils made of solid materials such as metals, wood, etc. - for example from German patent specification 469 176 - although known, but for the decoration according to the invention of porcelain, earthenware and enamel goods

so usable and therefore were used for the said Decorations have not been used so far, as they meet the requirements for perfect firing

709 639/493

of the decoration do not own. A coating of the body was required in order to establish the adhesion with a solution of rosin in turpentine, what with added cost and complication of the workflow.

When the images are transferred, the method according to the invention and easily mechanized is used just peeled off the masking paper without washing and the picture, with the picture side down (reversed), pressed onto the ceramic or enamel counterstancl. The pressure sensitive adhesive sticks firmly to the Ceramic or enamel object, and the backing paper can easily be peeled off without wetting will. This dry mode of transfer eliminates any subsequent and disruptive influence of Avoided water on the glaze.

The half-finished ceramic or enamel object now bears the reversed image in the following Series:

1. ceramic or enamel object,

2. adhesive stickers,

3. ceramic enamel paint,

4. Preprint varnish.

The object decorated in this way is then fired at temperatures of around 800 to 1400 ° C. Included the adhesive and preprint varnish burn without leaving any residue without affecting the enamel colors. The ceramic enamel colors flow and melt during this firing process with the glaze of the ceramic object.

Because the new process in the underglaze decoration of porcelain, earthenware and majolica goods as well as for the decoration of enamel goods that have not yet been fired, the Investigated the possibility of adding a glaze frit to the coating composition used as the pre-printing varnish. These attempts show particular advantages, since the preprint varnish on the picture increases when it burns and the frit incorporated into the preprinted varnish is a particularly resistant one Connection of the picture with the glaze or the enamel guaranteed. Before transferring the according to the invention The produced dry decal can develop if dry, unfired glazes are to be decorated, prove to be expedient to fix the areas to be decorated with a fixative.

Claims (3)

Patent claims: 1. Process for the production of decorations for porcelain, earthenware, majolica, enamel goods and the like., characterized in that the transfer of ceramic self-adhesive images is carried out on pre-fired or unfired glazes by means of a pressure-sensitive adhesive, on the backing paper or on the usual decal paper provided with a dextrin line a preprint varnish that forms an elastic skin after drying as a carrier of the with ceramic enamel colors applied decor is printed, whereupon on picture and preprint varnish a self-adhesive adhesive is applied and this is covered with a special paper which is removed when the image is transferred without washing beforehand. 2. The method according to claim 1, characterized in that a glaze frit in the pre-printing varnish is incorporated. 3. The method according to claim I, characterized in that unfired glazes or Emails are fixed with a fixative before the self-adhesive picture is affixed. Considered publications:
German patent specifications No. 99 058, 139 095,
469196.961377. 709 639/493 8.67 © Bundesdruckerei Berlin