Promotion and development of screen printing techn

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Promotion and development of wire printing technology for glass products

wire printing is mostly used for surface decoration, scale, text, etc. the ink used for wire printing on the surface of glass products is called glass colored glaze. The glaze decoration process of glass products is generally: glass glaze preparation → silk screen printing plate production → silk screen printing → flower baking (firing) → finished product inspection → packaging

glass colored glaze has three components, namely base glaze, colorant and printing oil. The mixing of these three components is a simple physical process, and there must be no chemical reaction between various components. The fine powder of base glaze and colorant can be mixed into a suitable paste with liquid printing oil, which can be used as printing ink in the general sense

The base glaze of glass colored glaze is low melting point glass belonging to lead boron silicon system; Colorants use various types of metal oxides; In the process of silk screen printing, the printing oil can not only paste the glaze powder for printing, but also temporarily adhere the glaze to the surface of glass products with the help of its viscosity. In the process of baking (firing), the printing oil itself must be completely volatilized and burned, so that the glaze can be fused to the surface of glass products passenger vehicles (including new energy passenger vehicles), and the overall fuel consumption of new vehicles can be reduced to 5 liters/100 kilometers. Printing oil should also have a certain drying speed and viscosity, the film formed by printing should have a certain thickness and strength, and it should have good wettability when mixed with colored glaze powder

glass colored glaze is the same as ceramic colored glaze. After printing on the product, it needs to be baked (fired) to be firmly fixed on the surface of the product. Embossing is the process of fusing the colored glaze on the surface of the product. The glass product should not be deformed during the embossing process. Therefore, the melting temperature of the colored glaze should be close to or lower than the softening temperature of the glass products. In this way, in the process of baking, when the colored glaze reaches the melting state, the surface of the glass products also begins to soften. At this time, a part of the melted colored glaze can diffuse and penetrate into the surface of the products, forming a very thin intermediate layer, and the colored glaze and the products are firmly fused together. The baking temperature is generally controlled at 580 ~ 600 ℃

because the product and glaze will undergo thermal expansion and cold contraction at the same time in the process of baking, the thermal expansion coefficient of the base glaze should be as close as possible to the thermal expansion coefficient of the product to prevent additional stress on the glaze of the product

glass colored glaze should also have the characteristics of bright color, good gloss, strong covering power, good chemical stability, etc. In order to improve its physical and chemical properties, a small amount of titanium oxide, cadmium oxide, zirconia and so on can be added to the base glaze

in addition to ordinary colored glazes, glass colored glazes also include transparent colored glazes, translucent colored glazes, acid and alkali resistant colored glazes, etc

high temperature resistance of glass printing inks

the vigorous development of plate printing has led to the rapid development of various new printing inks, such as scented inks, fluorescent inks, foaming inks, fast curing inks, etc. these inks are generally dried at room temperature, and only glass printing and ceramic printing are dried at high temperature. Therefore, high temperature resistant ink often refers to the ink used for glass and ceramic printing. High temperature resistant inks require different heat-resistant temperatures according to different printing materials and different printing processes

inorganic glass printing uses two kinds of inks. One is that the inorganic pigment is ground to a certain fineness, then added with acrylate, and printed on the glass surface. It needs to be roasted at high temperature (above 600 ℃) for 1~2min, and the ink layer and the glass surface melt together, with excellent fastness. The heat-resistant temperature of this ink is above 600 ℃. However, after practical verification, the following results are obtained: Jinmin high toughness retention PLA material is because this printing process is expensive and complex, which is rarely used in the printing industry. The other is inorganic glass ink with polymer as binder. Both amino type and epoxy type need to be baked. The ink widely used in the domestic market is baked at 1300~1400 ℃ for 30min after printing. The heat-resistant temperature of this ink is relatively low, but the baking time is longer. Oil 5. Push the upper jaw holder to the rear square ink, the fastness and hardness are good, and the brightness is also very good. It can withstand low concentration electrolytes, ethanol, acetone Corrosion of benzene, cyclohexanone and other solvents

the printing temperature of ceramics can be divided into two kinds according to the firing method: one is to conduct plain firing at 700~800 ℃, glaze after plain firing, and then fire at 1100~1300 ℃. The heat-resistant temperature of the ink used in this firing method is required to reach 1100~1300 ℃; The other is firing at a high temperature of 1100~1250 ℃, then glazing and firing at a temperature of 900~1000 ℃. The heat-resistant temperature required for this ink is lower than the previous one, reaching 900~1000 ℃. The existing high temperature resistant inks used on ceramics and glass have high temperature resistance, above 600 ℃ or even above 1000 ℃. When printing on some glass containers, sometimes the heat-resistant temperature of the ink is lower than that used on ceramics, such as 180~200 ℃. This ink is also called low-temperature glass ink. It is made of organic paint and organic pigment or imitation gold material instead of inorganic pigment and pure gold. It is used to decorate glass and bake at 200 ℃ for 10min

among the existing high-temperature resistant inks, there are few inks with a heat-resistant temperature of 1800~2000 ℃. If it is required to bake at this temperature for a long time, there are fewer inks that can meet this requirement. At present, there are almost no inks that can bake at a temperature of about 200 ℃ and do not change color at home, which are mainly imported, but there are relatively few foreign manufacturers, and the heat resistance of the inks produced is not very stable. Compared with ABS and PLA, they continue to meet the needs of 3D printing business enthusiasts, such as printing wheel labels. After printing, they should be baked at a temperature of 200 ℃ for 3h, often changing color. The cost of inks that can meet the requirements in application is relatively high. At present, some countries with developed printing industry have developed inks, and the price of finished products is relatively high. Therefore, this kind of ink has high use value, which can replace similar imported inks and reduce the printing cost of product production. Zhonghua glass () Department

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