DD158642A1 - METHOD FOR COLORED DECORATION OF GLASS - Google Patents

Abstract

The invention relates to a process for the colored decoration of Glasgegenstaenden and concerns primarily the Herstellg. mechanically resistant colored decors both in jewelery and in service glazes. Furthermore, this method permanent color markers, scales, labels, etc. can be attached to places that are surface stressed heavily. Goal d. Erfindg. is d. Schaffg. a process for the produc permanent colored decors o. Markings on Glasgegenstaenden, where d. Disadvantages of previous technical solutions should be avoided. It was the object of a method for decorating u. Marking glass objects to find, with the colored decorative elements, scales, labels, markers can be permanently attached. This is inventively achieved in that by means of a laser beam in the surface of the object to be decorated, a predetermined pattern is introduced and then the filled by the laser beam in the glass surface recesses filled with the color component and this is baked. It has been found that it is advantageous to chemically solidify the glass to be decorated prior to the laser treatment by cryogenic ion exchange in potassium nitrate and, after engraving the decoration, to contact the article with a lithium nitrate melt.

Description

229493

Field of application of the invention

The invention relates to a method for the colored decoration of glass objects. It is primarily used for the production of mechanically resistant colored decors in both jewelery and consumer glasses. Furthermore, permanent color markings, scales, inscriptions and the like can be applied with this process, which are endangered in their adhesiveness, in particular by mechanical effects such as disguise and the like on the surface of the glass article.

Characteristic of the known technical solutions

Glasses have been decorated in very different ways. For example, it is possible to apply colored negative pressures by grinding, cutting or etching colored glass. S ¹ Ur filigree jewelry elements is the etching by laser beam usual (DD-PS 118251). Colored positive decors could not be realized with these methods, ie the lines and surfaces etched with the laser beam have the color of the background. Further decoration options are the application of chandeliers or metal layers.

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Wide spread for the production of colored decors has found the screen printing. The disadvantage of the screen printing décors lies above all in their low mechanical resistance, for example when exposed to mechanical cleaning methods of the glasses.

For the introduction of markings or scales, one usually uses sandblasting, ultrasound or acid etching. Colored markings can not be produced in this way. In Japanese Patent IA 4-9-4352 a method for applying colored images on glass and ceramic by means of laser radiation is presented in which color layers were applied to the glass to be decorated and baked by means of laser. The disadvantage here is that the color layers must be applied very evenly and a large part of the color component is evaporated by the laser beam and thus lost to the decoration.

Object of the invention

The aim of the invention is to provide a process for the production of durable colored decorations and / or markings on Gläsgegenständeh, the disadvantages of previous technical solutions should be avoided.

Essence of the invention

The invention is based on the object to find a method for decoration and / or marking of objects made of glass, whereby permanent colored decorative elements, scales, labels, markings, etc. are attached.

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According to the invention, this object is achieved in that with the aid of a laser beam in the surface of the glass object to be decorated or to be marked a predetermined pattern is introduced and then the recesses generated by the laser beam in the glass surface filled with the color component and this is baked. The filling of the laser-etched recesses can be done by spraying the color component and then removing the color body from the unetched surface by stripping, buffing or polishing or the color component is rubbed directly into the recesses. The pattern of fawning produced as a result of the laser processing has moreover

good adhesion of the paint component due to the relatively rough surface

In order to achieve a uniform distribution of the color in the laser beam introduced cavities, it proves to be advantageous to chemically solidify the glass to be decorated before the laser treatment by cryogenic ion exchange in KNOo ·

After engraving the decoration or marking to be applied, the glass is brought into contact with a LiNO.sub.2 melt, wherein the pattern or marking engraved by the laser crystallizes out superficially as a result of eukryptite or spodumene formation. The color components subsequently introduced into the crystallized depressions are distributed there homogeneously along the grain boundaries, so that after the stoving the color appears uniform everywhere and has penetrated deeper into the glass matrix.

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The invention will be explained in more detail by the following embodiments, wherein the invention is not limited to these examples.

Example 1:

A glass tube of 20 mm diameter and 3 mm wall thickness was applied to a scale. For this purpose, the tube was rotated in a rotating device at a constant speed about the longitudinal axis. With the help of a CC ^ laser of 200 watts power, beads of 0.5 mm width were engraved on the glass tube jacket at a distance of two millimeters. After laser engraving, the glass tube was sprayed with blue screen ink and then the excess paint was rubbed off with a hard rubber bakel. While the original surface was again free of color components, the laser engraved scale continued to have the stoving color. At 500 - 55O ⁰ G, the paint was then baked for two hours and then slowly cooled. The engraved scale was colored strongly blue.

Example 2:

A colorless stemmed glass was decorated by rotating it evenly on a turntable while simultaneously lifting slowly with a laser analogous to Example 1. After the laser decoration, the glass was sprayed with a red stoving paint and the excess paint was abraded as in Example 1 and the ink remaining in the engraving baked. The glass showed a red stripe decor which could not be removed by mechanical effects such as scratching and scratching.

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Example Ji

A metal stencil with a vine leaf decoration was pushed over a bar glass and the glass was rotated on a turntable with simultaneous vertical movement of the plate. During this movement, the laser beam scanned the entire metal template as in Example 1 and left the desired decoration on the bar glass. . Subsequently, the glass was rolled with a green color component and the excess color rubbed off, so that only in the laser-generated recesses of the glass surface dye was present, which was baked by the appropriate temperature treatment. The glass showed a strong green vine leaf pattern. The paint had a high mechanical abrasion resistance.

Example 4 s

Sin soda lime glass in the form of a cup was subjected to K / IIa ion exchange in a KNO ^ -SaIζschmelze over 4 hours at 400 ⁰ C and then cleaned. Now, the glass cup has been decorated with the laser beam according to Example 2, inschließend the glass was the Li / Ha ion exchange in a LiUOo / NalTCU molten salt (40: 60) at 35O ⁰ G subjected to 20 minutes, the machined with the laser beam portions of the surface crystallized and appeared white. The coloring of these white areas is carried out by rolling a yellow color body and subsequent abrasion of the protruding color component. The colored decoration is baked at 500 - 55O ⁰ G for two hours. The glass showed a bright yellow décor, which has high mechanical abrasion resistance and resistance to washing solutions.

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Example 5 *

A colorless stemmed glass was slowly turned on a turntable. With the aid of the laser described in Example 1, a sine wave-like pattern was engraved into the glass by mechanical luffing and ib movement of the lens. Into the engraved grooves was rubbed a mixture of titanium nitride film of grain size less than 1 μm and a colorless glass frit, mingled with screen printing oil. Bach baking at 55O ⁰ C, a golden pattern showed on the glass, which could not be removed by mechanical scrubbing.

Claims (2)

229493 8 Inventive claim t 1. A method for decoration or Markierimg of objects made of glass, characterized in that is engraved with the aid of a laser beam of sufficient energy density on the surface of the surface to be decorated or to be marked glass object, the intended pattern and sprayed in this engraving in a subsequent second process step, a color component , rolled or rubbed in, and then the paint located on the nondecorresponding surface is removed and thus color components are present only in the patterns etched by the laser beam, which are baked or melted accordingly. 2. The method according to item 1, characterized in that are used as the color body screen printing inks, enamels or Farbglasfritten individually or in admixture.