BLOW MOLD

摘要

PROBLEM TO BE SOLVED: To produce a resin molded product having a good mirror surface or embossed surface within a relatively short cycle time by a relatively simple process. SOLUTION: A blow mold to be used is constituted by supporting a mold body 3 equipped with a molding surface 321 to which a molten thermoplastic resin is pressed in a close contact state to be solidified by a mold main body 4 so as to ensure a space on the rear surface side of the molding surface 321 and providing cooling means 71a(71b), 70a(70b) cooling the molding surface to the Vicat softening temp. (T)-10 deg.C of the thermoplastic resin or lower and providing a heat insulating material layer 32 with heat conductivity of 0.1-0.8[cal/cm.s. deg.C] to the surface layer of the molding surface 321 or in the vicinity thereof.