Patent ID: 8231376

Claim:
A metal mold for compression forming, comprising: a cavity metal mold for forming the outer surface of a blow-formed portion of a preform which is a formed body; a core metal mold for forming at least the inner surface of said preform; and a slide insert metal mold split into at least two and structured and arranged for upward and downward movement, and for forming the outer surface of at least a nozzle portion of said preform; wherein said slide insert metal mold coupled together from a split state is lowered onto said cavity metal mold thereby sliding a fitting portion which includes a preform-forming portion of said slide insert metal mold and said cavity metal mold to maintain a pressure; and an auxiliary fitting portion where said slide insert metal mold and said cavity metal mold undergo sliding is structured and arranged at a position not forming the preform and separate from the fitting portion that includes said preform-forming portion, wherein the auxiliary fitting portion comprises a cylindrically shaped surface, wherein at the time of closing operation of the cavity metal mold and the core metal mold during compression forming, after said auxiliary fitting portion starts to come into contact with and slides earlier than the fitting portion which includes said formed body-forming portion, said formed body forming portion fits and slides, and wherein the fitting clearance of said auxiliary fitting portion is smaller than that of the fitting portion which includes said formed body-forming portion.