Effects of Tensile Strength and Tensile Breakup Energy on Mulling Processes of Wet Powders

Abstract

The dynamic mixing power required for mulling process of green mold sands was measured by using various types of kneaders and binding materials. A series of tensile tests for the green mold sands were carried out. The surface structures of the sands were also observed by a scanning electron microscope. The state of mulling of the sands was found to be successfully correlated with the tensile strength, the tensile breakup energy and the compression characteristics of the sands. It was also found that the completeness of mulling process could be assessed by observing the steadiness of the power for mulling, and that it could be evaluated in terms of the tensile breakup energy. The more the power for mulling was required, the better the state of mulling was.