| 摘要 |
PROBLEM TO BE SOLVED: To effectively prevent molding defect without prolonging a molding cycle by mainly putting a cavity part in a highly vacuum state for a short period of time. SOLUTION: A mold device for injection molding comprises a vacuum chamber 41 having a larger capacity than a cavity part 4 which is formed on a whole of the inside of a peripheral wall by composing a spacer block 24 in a peripheral wall form by a vacuum suction mechanism part 37, a vacuum suction device 51 which is connected to the vacuum chamber 41 and can always vacuum and suck inside of the vacuum chamber 41, a vacuum hole 55 which is provided on the inner part of a movable side mold plate 6 and communicates with the cavity part 4 and the side surface of the movable side mold plate 6, a vacuum short pipe line 58 for short connection which is provided on the outer part between the side surface of the spacer block 24 and the movable side mold plate 6 and can connect the vacuum chamber 41 with the vacuum hole 55, and a vacuum solenoid valve 59 provided in the middle of the vacuum short pipe line 58 for short connection. COPYRIGHT: (C)2009,JPO&INPIT
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