| 摘要 |
PROBLEM TO BE SOLVED: To provide a molding mold for injection molding by which a sprue portion and a runner portion are effectively cooled at a low cost and molding circle can be shortened. SOLUTION: In a mold constituted of a plurality of mold members, forming a sprue and a runner, and performing injection molding, the mold members has hole portions or recessed portions 14 to 16 for forming the sprue or the runner, and a cooling air passage way portions 17 to 23 are arranged in the vicinity of the hole portions or the recessed portions. In the mold members, a groove 27 which is a passage of the cooling air is arranged in the vicinity a sprue bush 13 having the hole for forming the sprue which is the hole portion 14 for forming the sprue in the surface thereof. COPYRIGHT: (C)2008,JPO&INPIT
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