6 main ways to prevent fetal cracks in bone china cups

The formation of bone china mainly relies on silicon oxide, aluminum oxide and calcium oxide. The higher the content of calcium oxide, the better the color. In nature, there are not many sources of calcium oxide, so animal bone meal is chosen as the source of calcium oxide. In fact, the so-called bone china is a bone china product made from herbivore ashes (mainly Ca3(PO4)2) as raw materials, mixed with high-quality kaolin, quartz and other auxiliary materials, and glazed at 1280°C. Generally speaking, bone china can be called bone china by adding 25% of bone powder to the raw material. However, the best bone china recognized in the world is 45%-51% of bone powder content, and bovine bone is better. With the rise of people’s living standards in today’s society, bone china products are also more popular and cater to the market, such as bone china cups, mugs, conference cups, bone china tea set, white porcelin dinnerware set, bowls and saucers, wine set , Bone china craft gifts, coffee set, water set, three-piece office set, etc.; bone china products are light, dense and hard (twice the daily porcelain white porcelin dinnerware), not easy to wear and break, and have moderate light transmittance, Thermal insulation, the color becomes the unique natural milky white of natural bone meal. The manufacturers of bone china are mainly in Europe and Japan; only a few manufacturers in my country, Zibo and other places produce and export. Although bone china products are light, beautiful and popular, there will be some problems in the production process, such as the main method to prevent fetal cracks we are going to talk about today. The following are the six main methods to prevent fetal cracks summarized by our Guangdong Hosen Ceramics Company for many years of production: 1. The stale, rough, and finely trained mud must be strictly controlled according to the required indicators. The aging time of the mud should not be less than one month, and the vacuum degree should be above 700 mm mercury column. 2. If the viscosity of the mud and the size of the shrinkage do not meet the requirements, the mud formula should be adjusted in time. 3. The bottom dam of the disc model should be drilled with ventilation holes. The angle of the roller clamp should be correctly designed according to the different characteristics of the plate and saucer. Generally, it should be: 15~17° for bowls, 19~21° for plates and dishes, and 22~28° for cups. If the tip of the roller head wears out, it should be adjusted in time. 4. After glazing, glazing, hydrating, etc., the blank tire has been wetted. Therefore, when trimming, inspecting, and cutting blanks, you should use a suction device to take and set the blanks. Be sure to take it lightly and put it lightly. 5. If there are organic matter or unclean impurities in the mud, it should be removed in time. 6. When bonding product parts, the operation should be careful and the joints should be tight. If it is found that the joint mud does not meet the requirements, the formula should be adjusted in time.
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