Application of screen printing technology on glass directly printed color glaze

When early decal paper printing was just beginning to become popular, decals were applied to the glass and baked back to make the colored glaze on the flowers stick to the glass, but the effect was not ideal. Since the glass softening temperature is much lower than the ceramic sintering temperature, when the glaze powder on the decal is far from the melting temperature, the glass body has started to soften, and it is difficult to achieve the desired effect.

Normal > After the 1970s, with the development of screen printing technology, the method of printing color glaze directly on the screen by screen printing has been widely used.

Normal > I. Glass printing ink

Normal > Prints on glass on a screen, and its platemaking and printing are the same as ordinary screen printing. Glass printing is characterized by its ink. The glass printing ink is mainly composed of three components:
   

Normal > (1) Frothed glass frit. The glass frit used for making glass ink is generally composed of silica, boron trioxide, lead oxide and alumina.

Normal > (2) Glass pigments. The glass printing must be sintered at high temperature to fix the pigment on the glass. Therefore, the pigment of the ink cannot use organic pigments, and only inorganic metal oxides can be used. Once sintered at high temperatures, these metal oxides are integrated with the glass and the glass is colored. The inorganic pigments commonly used as glass inks are as follows:

Normal > red   Cadmium sulfide   yellow   Lead chromate, cadmium sulfide, uranium salt;

Normal > green   Chromium oxide   blue   Alumina drilling

Normal > brown   Iron oxide   white   Calcium oxide, kaolin, etc.

Normal > black   Oxide, manganese oxide and other mixtures;

Normal > The color change on the screen is endless, and in order to display various different transition hues and different brightness of light and shade, a variety of color materials are often used properly.

Normal > The glass is mixed with a glass frit and ground to a fine powder before it can be used as an ink. This powder is also called a glass glaze powder.

Normal > (3) Diverted oil. The varnish is the link material for glass ink. It is made up of terpineol and turpentine, plus an appropriate amount of alkyd resin. A certain degree of fluidity is required on the side of the ink, so that the glass glaze powder can be well dispersed and has good printability; on the other hand, before the glass glaze is melted, it is necessary to perform gas flow before sintering. The combustion is clean and there is no adverse effect on the formation of the color glaze.

Normal > Second, glass printing

The use of screen printing method directly on the glass printing color glaze ink, according to the glass