| 摘要 |
PROBLEM TO BE SOLVED: To improve the releasability of a molded body and prevent resin drosses from adhering onto a cavity surface by a method wherein the surface, which comes into contact with molten resin material, of a mold surface is formed into a smooth surface so as to produce a satin-finished surface having no undercut part on the mold surface by blasting rigid granular materials against the smooth surface. SOLUTION: A smooth surface 21 is formed on a mold cavity surface so as to blast rigid granular materials 22 made of super-hard metal material, ceramic or the like against the smooth surface 21. Further, on the mold cavity surface 30, a satin-finished surface having no undercut part is formed. As a result, the releasability of a resin seal molded body molded in a mold cavity can be improved. Furthermore, resin drosses can be efficiently prevented from adhering onto the mold cavity surface 30 after the resin seal molded body is separated from a mold. As the rigid granular material 22, an ellipsoidal body or a body having a polygonal section may well be employed. |
