Ceramic high-strength gypsum powder common kinds and usages

                   Ceramic high-strength gypsum powder common kinds and usages

Often are used in ceramic forming production, gypsum model. The plaster model is composed of gypsum powder production. Because of the characteristics of porcelain, production technology, the ways of forming, the requirement of gypsum powder is also different. As a result, there will be various types of on the market, the following is introduced respectively.

1, grouting forming with gypsum powder
Grouting molding in the ceramic production of porcelain (varieties). Ceramics for daily use big special-shaped products, sanitary ceramics, physical and chemical porcelain, ceramic firing with some of the kiln furniture such as grouting forming production. Main requirements plaster model of grouting forming water absorption performance. Generally USES ordinary beta gypsum powder or part of the alpha and beta proportional mix of gypsum powder, fineness of 80 mesh to 120 mesh in general. In proportion of gypsum and water (1.2 ~ 1.46) : 1. According to different porcelain and the production process, the different proportion of gypsum and water. Such as physical and chemical porcelain ceramics for daily use and small grouting in production, because is the atmospheric pressure forming and smaller volume, demand is not high, the strength of the model focuses on water imbibition of the model, so the ratio of gypsum and water is in commonly 1.2:1. The model of the bibulous rate is generally 45% ~ 50%, dry flexural strength in 2.8 ~ 3.5 Mpa. And micro pressure grouting forming production health ceramics and ceramics for daily use in the production of pressure grouting, generally larger, in addition to model focuses on water imbibition, also puts forward strict requirements for the strength of the model, so the ratio of gypsum and water demand is big, be in commonly (1.35 ~ 1.5) : 1. This model of bibulous rate is in commonly 35% ~ 42%, dry flexural strength in 3.8 ~ 4.5 Mpa.

2, rolling with gypsum powder
Roll forming is the main forming methods of ceramic. Its main emphasis on the strength of the model, load model with the strong abrasion resistance and impact resistance ability, at the same time also require model has certain water absorption performance and high temperature resistant performance. Use of gypsum powder is mainly high strength alpha gypsum powder. The proportion of gypsum and water in commonly (1.6 ~ 1.8) : 1, bibulous rate is in commonly 27% ~ 31% of the model. In order to ensure the strength of the model and to prevent deformation, according to different manufacturers, gesso product the size of the volume and the different methods of die forming process of Yin and Yang, can fine-tune the proportion of gypsum powder and water, generally the proportion of small size is smaller, the (1.6 ~ 1.7) : 1; The proportion of high volume big, in the (1.7 ~ 1.8) : 1, some even higher up to 2.0:1, the model of water absorption rate was 22% ~ 23%.