What is the production process of bone china?

With the improvement of people's living standards, bone china, as a world-recognized high-end porcelain tableware species, is increasingly sought after by people, and its market scale is gradually expanding. While eagerly pursued, few people know how bone china is produced. Below, the editor of Guangdong Hosen chinaware ceramic manufacturer will tell you the production process of bone china. In nature, there are not many sources of calcium oxide, so people choose animal bone meal as the source of calcium oxide. Generally speaking, bone china can be called bone china by adding 25% bone powder to the raw material, but bone china with the best texture is recognized in the world today with a bone powder content of 45%-51%, and bovine bone is preferred. Raw material: High-quality bone china is made by adding a large amount of beef bone powder with less impurities to the raw materials with feldspar and scopollite clay as the main raw materials. Forming: bone china uses exquisite materials, fine production, and strict standards. Its regularity, whiteness, transparency, thermal stability and other indicators are all dependent on its raw materials silicon oxide, aluminum oxide and calcium oxide. The higher the content of calcium oxide, animal bone meal, the better the color. When the bone meal content reaches a certain ratio, the quality of the porcelain tableware will be greatly improved, which is mainly reflected in the gloss and moistness of the utensils. However, if the content exceeds a certain ratio, the composition of the clay will be relatively reduced, and the porcelain will become excessively soft, and the more likely it will be to burn during the production process. Higher technology is required for forming, which increases the difficulty of firing. More precious. Firing: (1) The formed bone china is sintered at the highest temperature of 1250℃. During the sintering process, the shrinkage of bone china is very large, so the finished product will shrink by 20% after kiln firing (generally porcelain white porcelin dinnerware shrinks by 7%). Therefore, the shape is easy to deform, and the plates, bowls, etc. must be placed on the special Kuang bowls for long-term cooking. (2) After that, check the shape and size. After grinding the surface, spray the glaze with a sprayer, and then enter the kiln to burn the glaze at 1150°C. Coloring: The general method of coloring is to paste transfer paper on a white finished product and burn it at 820°C. Inspection: All the itineraries are strictly inspected, and the qualified products will be sent to the next itinerary for delivery. Bone china not only has a gorgeous and exquisite appearance, but is also conducive to people's health compared with ordinary porcelain. products will inevitably be corroded by acid and alkali in daily use, and trace metals will overflow, which will affect human health over time. The bone china does not contain lead and cadmium. The in-glaze color underglaze bone china is not only free of lead and cadmium, but also the flower surface is not easy to wear and fall off. In addition to being used as general tableware, it is also suitable for microwave use. It is a well-deserved green Healthy chinaware ceramic.
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