Process characteristics of bone china

The technological characteristics of bone china: 1. The second firing process is a typical representative of soft porcelain white porcelin dinnerware in the history of bone china, with high-temperature biscuit firing and low-temperature glaze firing as the most significant process features. The secondary firing process of bone china is different from the traditional low-temperature bisque firing and high-temperature glaze firing processes, which can better solve the problems of high-temperature deformation and glaze gloss. The Japanese call unglazed green bodies at low temperatures (around 900°C), unglazed green bodies at high temperatures (around 1300°C), and glazes called Honyaki. 2. The forming process bone china adopts 40%-50% non-plastic bone powder. The total amount of clay in the green body formulation is low. Compared with ordinary ceramics, the plasticity is poor and the forming is more difficult. Generally, the following methods are used to improve plasticity or yield: ①Use high-plasticity clay ②Use organic plasticizers such as CMC ③Increase particle fineness and practice mud for many times; ④Use hot roll forming machinery. 3. The firing process The use of imitation saggers is the most representative process in the bone china firing process. Because the firing range of bone china is narrow, the shrinkage is large, and it is easy to deform the bed during firing, so buckle firing, Processes such as bracing or burial firing can solve the deformation problem. 4. Kiln furniture materials Bone porcelain uses kiln furniture materials that have higher requirements than general chinaware ceramic. Most kiln furniture must match the product. Generally, each type of product has a matching kiln furniture. It is also a place where bone china production is more cumbersome than general ceramic production. The bone china production team has great demand for kiln furniture materials, and the requirements for the working surface of kiln furniture products are also quite high. 5. The mold material bone china has a high production cost and is generally suitable for making high-grade porcelain. The carcass is thin and the mold requirements are stricter. It is necessary to use high-quality plaster for fine processing and production, and strictly control the use times of the mold, and the mold cannot be used for a long time. 6. Production management The material of bone china is white and delicate, and the small stains are particularly dazzling. It produces high-grade porcelain white porcelin dinnerware and strict and meticulous production management to ensure product quality.
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