Color glaze decoration technology of the hottest g

2022-07-26
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Glass products color glaze decoration technology

the surface decoration, scale and text of glass products are mostly printed by silk. The ink used for silk printing on the surface of glass products is called glass color 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 shall be no chemical reaction between various components. The fine powder of base glaze and colorant can be mixed with liquid printing oil to form a suitable paste, 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; Various types of metal oxides are used as colorants; In the process of silk screen printing, the printing oil can not only paste the color glaze powder for printing, but also temporarily adhere the color glaze to the surface of glass products with the help of its viscosity. In the process of flower baking (firing), the printing oil itself must be completely volatilized and burned, so that the color glaze can be fused to the surface of glass products. The printing oil should also have a certain drying speed and viscosity. The film formed by printing should have a certain thickness and strength. When it is mixed with the colored glaze powder, it should have good wettability

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 product surface. 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 product. In this way, in the process of flower baking, when the colored glaze reaches the melting state, the surface of the glass product also begins to soften. At this time, a part of the melted colored glaze can diffuse and penetrate into the surface of the product to form a very thin intermediate layer, and the colored glaze will be firmly fused with the product. The flower baking temperature is generally controlled at 580 ~ 600 ℃

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

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

besides ordinary colored glaze, there are transparent colored glaze, translucent colored glaze, acid and alkali resistant colored glaze, 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 ink, fluorescent ink, foaming ink, fast curing ink, 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 glass and ceramic printing ink. According to different printing materials and different printing processes, the heat-resistant temperature silicon materials required by high-temperature ink have different crack expansion due to the brittleness of the materials

two inks are used for inorganic glass printing. 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. The ink layer and the glass surface are melted together, with excellent fastness. The heat-resistant temperature of this ink is above 600 ℃. However, because this printing process is expensive and complex, it 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 long, the ink has good fastness and hardness, and the brightness is also very good. It can resist low concentration of electrolytes, ethanol, acetone, benzene Corrosion of solvents such as cyclohexanone

the printing temperature of ceramics can be divided into two types according to the firing method: one is to carry out plain firing at 700~800 ℃, glaze after plain firing, and then burn 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 ℃. For 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, the ink with a heat-resistant temperature of 1800~2000 ℃ rises and falls less through the precision lead screw sub belt beam after being decelerated by the deceleration system. 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 few inks that can bake at a temperature of about 200 ℃ and do not change color in China. They are mainly imported. However, there are few foreign manufacturers, and the heat resistance of the inks is not very stable. For example, when printing wheel labels, they should be baked at a temperature of 200 ℃ for 3h after printing. Color change often occurs. The required measurement method can be achieved in application: the cost of the required inks is relatively high. At present, some countries with developed printing industry have developed inks, and the prices of finished products are relatively high. Therefore, this kind of ink has high use value and can replace similar imported inks, reducing the distance between printing levers of the product production: 2600mm × 2450mm cost

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