Prevention of Cracks in Drying Process of Slip-Cast Hollow Green Body for Large Pottery

Abstract

The occurrence of cracks in a drying process of slip-cast hollow green bodies for large potteries was investigated. In the slip casting process, the flow of the poured slurry was observed, and a weld line was formed in the green body by contact between the side surfaces of slurry. In the drying process, the moisture content of the green body in the weld line was lower than that in the neighboring parts, and thus cracks occurred at the weld line. Vibration of the plaster mold during the slip casting was proposed to prevent the occurrence of cracks in the drying process. It was found that the vibration is effective in preventing the cracks.