| 摘要 |
PROBLEM TO BE SOLVED: To provide injection molding equipment which molds by injection an article having no short shot part in a thin-wall part. SOLUTION: A breathing hole 2 is formed in the portion of a mold wherein a thin-wall part is formed, and a breathing pin 3 split longitudinally is inserted and fixed in the breathing hole 2. Gas in a cavity B is discharged forcibly from a gap a1 between the inner wall surface of the breathing hole 2 and the outer surface of the breathing pin 3 and from a gap a2 in a joint of breathing pin parts 3a and 3b.
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