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[China Glass Net] A variety of colored glass can be obtained by adding a small amount of glass colorant when melting glass. Copper (II) oxide or chromium (III) produces green; cobalt (II) produces blue; manganese dioxide produces purple; tin dioxide or calcium fluoride produces milky white; uranium compounds produce yellow-green fluorescence; colloidal selenium produces Red jade color; colloidal gold produces red, reddish purple or blue; cuprous oxide produces red, green or blue; ferrous compounds produce green, when the amount is high, black; iron (III) compounds produce yellow. When making glass, since the raw material contains ferrous impurities, the glass is often greenish, and a small amount of manganese dioxide or selenium may be added to make it into a colorless glass.
Glass screen printing jewelry wholesale, is the use of screen printing plate, using glass glaze, decorative printing on glass products. Glass glaze is also called glass ink and glass printing material. It is a paste printing material which is obtained by mixing and mixing coloring materials and binders. The coloring material is composed of an inorganic pigment and a low melting point flux (lead glass powder); the binder is commonly known as a slab oil in the glass silk screen industry. After printing, the glassware should be placed in a fire oven and fired at a temperature of 520~600 °C. The glaze printed on the glass surface can be fixed on the glass to form a colorful decorative pattern. If you use silk screen together with other processing methods, you will get better results. For example, polishing, engraving, etching, etc., the glass surface is processed before or after printing, and the printing effect can be doubled. Glass products etched screen printing For a long time, the etched decoration of glass products is to apply a wax layer and other reinforcing materials on the surface of the glass as a resist layer, and then use a needle, a knife or the like to mark the pattern on the coating to expose the glass. The surface is then etched with hydrofluoric acid at this location. This process continues to be used by manufacturers, but its processing method is time consuming, laborious and inefficient. The silk screen etching process makes the etching and decoration of glass products simple, time-saving and labor-saving. The etched silk screen of glass has two methods of hot stamping and cold stamping. Thermoplastic etching silk screen is a kind of adhesive prepared by paraffin, asphalt, stearic acid, etc., and added with a small amount of anti-corrosion powder to prepare a resist printing material. The hot-printing screen version is used to print the printing material according to the design pattern. To the surface of the glass, a resist film is formed. A part of the Korean jewelry that exposes the glass on the resist film is a pattern that needs to be etched. The etching is carried out using chlorofluoric acid, and after etching, the resist layer printed on the glass is washed away with boiling water. Glass silk screen etching can also be carried out by cold stamping. The resist print can be made of a special asphalt paint plus a resist powder, or a commercially available anti-ink can be purchased. After the printing is completed, the hydrofluoric acid can be corroded after the resist film is completely dried.
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