The surface decoration, scale, and text of glass products are mostly screen printed. The ink used for screen printing on the surface of glass products is called glass color glaze. Glass glaze decoration process is generally: glass glaze preparation → screen printing plate production → screen printing → baked (fired) → finished product inspection → packaging.
Glass glaze has three components, namely base glaze, colorant and printing oil. The mixing of these three components is a purely physical process and there must be no chemical reaction between the various components. The fine powder of the base glaze and the colorant can be used as a printing ink in the ordinary sense by adjusting and synthesizing a suitable paste with a liquid printing oil.
Base glazes of glass glazes are low melting point glasses of the lead-boron-silicon system; various types of metal oxides are used for colorants; printing oils can be used to paste color glaze powders for printing in the silk screen printing process. In addition, the color enamel can be temporarily adhered to the surface of the glass product by virtue of its viscosity, and during the baking (burning) process, the printing oil itself must be completely volatilized to burn the enamel, so that the color enamel fused to the surface of the glass product. The printing oil should also have a certain drying speed, a certain viscosity, and the film formed by printing should have a certain thickness and strength, and should have good wettability when mixed with the color glaze powder.
Glass-colored glazes, like ceramic glazes, must be roasted (fired) after being printed on the product to be firmly attached to the surface of the product. The roasted flower is the process of melting the colored glaze on the surface of the product, and the glass product should not be deformed during the baking process. Therefore, the melting temperature of the color glaze should be close to or lower than the softening temperature of the glass product, so that during the baking process, when the colored glaze reaches the melting state, the surface of the glass product also begins to soften, and at this time, a part of the melted color glaze can be diffused. Penetrate to the surface of the product to form a very thin intermediate layer, and the color glaze is firmly fused with the product. The temperature of baking is generally controlled at 580-600°C.
Since the products and the glaze are subjected to thermal expansion and contraction at the same time during the baking process, the coefficient of thermal expansion of the base glaze should be as close to the coefficient of thermal expansion of the product as possible to prevent additional stress on the glaze of the product.
Glass glazes should also have bright colors, good gloss, strong hiding power, and good chemical stability. In order to improve its physical and chemical properties, a small amount of titanium oxide, cadmium oxide, zirconium oxide, etc. may be added to the base glaze.
Glass color glaze in addition to the ordinary color glaze, there are transparent glaze, translucent glaze and acid, acid and alkali glaze.
Glass glaze has three components, namely base glaze, colorant and printing oil. The mixing of these three components is a purely physical process and there must be no chemical reaction between the various components. The fine powder of the base glaze and the colorant can be used as a printing ink in the ordinary sense by adjusting and synthesizing a suitable paste with a liquid printing oil.
Base glazes of glass glazes are low melting point glasses of the lead-boron-silicon system; various types of metal oxides are used for colorants; printing oils can be used to paste color glaze powders for printing in the silk screen printing process. In addition, the color enamel can be temporarily adhered to the surface of the glass product by virtue of its viscosity, and during the baking (burning) process, the printing oil itself must be completely volatilized to burn the enamel, so that the color enamel fused to the surface of the glass product. The printing oil should also have a certain drying speed, a certain viscosity, and the film formed by printing should have a certain thickness and strength, and should have good wettability when mixed with the color glaze powder.
Glass-colored glazes, like ceramic glazes, must be roasted (fired) after being printed on the product to be firmly attached to the surface of the product. The roasted flower is the process of melting the colored glaze on the surface of the product, and the glass product should not be deformed during the baking process. Therefore, the melting temperature of the color glaze should be close to or lower than the softening temperature of the glass product, so that during the baking process, when the colored glaze reaches the melting state, the surface of the glass product also begins to soften, and at this time, a part of the melted color glaze can be diffused. Penetrate to the surface of the product to form a very thin intermediate layer, and the color glaze is firmly fused with the product. The temperature of baking is generally controlled at 580-600°C.
Since the products and the glaze are subjected to thermal expansion and contraction at the same time during the baking process, the coefficient of thermal expansion of the base glaze should be as close to the coefficient of thermal expansion of the product as possible to prevent additional stress on the glaze of the product.
Glass glazes should also have bright colors, good gloss, strong hiding power, and good chemical stability. In order to improve its physical and chemical properties, a small amount of titanium oxide, cadmium oxide, zirconium oxide, etc. may be added to the base glaze.
Glass color glaze in addition to the ordinary color glaze, there are transparent glaze, translucent glaze and acid, acid and alkali glaze.
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