| 摘要 |
PURPOSE:To obtain an abrasive material which can be used for a long period by using, as abrasive material, a synthetic resin particle which has cracks which can be cleaved by an external force, so that new edges are always formed, because the particle is cleaved by the shock during vapor blasting. CONSTITUTION:An unsaturated polyester resin block is formed by pouring the unsaturated polyester material added with catalyst into a mold. Then, said block is cut to form pellet form, and after pulverized by a crasher, etc., further said pellet is pulveriszed mintely by a ball mill, etc., and an unsaturated polyester resin particle 6 having a number of cutting edges is obtained. Then, said pulverized body 6 is further pulverized minutely by using a compression machine in which the crashed pieces 3... are having a relatively high hardness held onto the opposite surface of the upper and the lower molds 1 and 2 through adhesive layers 4a and 4b, and an abrasive material 8 which has cracks 7 which can be cleaved by an external force is obtained. Said abrasive material 8 is used for removing the burr on a molded article, in a blasting apparatus. |
