The production process of bone china
Apr 14, 2023
Bone china is a type of porcelain that is made from a mixture of clay, feldspar, bone ash, and kaolin. It is known for its translucency, strength, and whiteness.
The production process of bone china involves several steps:
1. Preparation of raw materials: The china clay, feldspar, bone ash, and kaolin are sourced and prepared for use.
2. Mixing: The raw materials are mixed in specific proportions to produce the bone china body. The ratio of bone ash to kaolin varies depending on the manufacturer.
3. Forming: The bone china body is then formed into the desired shape through slip casting, jiggering, or pressing.
4. Drying: The formed bone china articles are dried at room temperature or in a dryer.
5. First firing: The bone china articles are fired in a kiln at a temperature of around 1200°C to turn them into bisqueware.
6. Glazing: The bisqueware is then dipped into a glaze solution, which is a mixture of water, feldspar, and silica. The glaze melts during the second firing process, giving the bone china its characteristic translucence.
7. Second firing: The glazed bone china articles are then fired for a second time at a temperature of around 1240°C to 1300°C to fully vitrify the glaze.
8. Decoration: Once the bone china articles are fired, they can be decorated with hand-painted designs, decals, or gold or platinum luster.
9. Quality control: The finished bone china articles are examined for any defects or flaws before being packaged and sent for sale.
Overall, the production process of bone china involves several meticulous steps that require attention to detail and precise timing to produce high-quality bone china.
