| 摘要 |
PROBLEM TO BE SOLVED: To provide an injection molding machine which is of a runner structure such as not becoming complicated on the parting line of a mold, although the mold is of a multi-cavity type and requires only a low percentage of increase in the necessary mold clamping force. SOLUTION: A cavity retainer plate 11, an intermediate retainer plate 15 and a movable retainer plate 13 are arranged in one mold opening/closing direction in such a manner that the adjacent retainer plates are mutually openable/ closable, and thus two parting lines 17, 19 are provided. In addition, a required cavity 35, a runner 39 and a nozzle touch 41 which lead to the cavity 35 are formed in each of these parting lines 17, 19. Further, a heating cylinder 5 for injecting a molten resin into the cavity 35 has two injection nozzles 65R, 65L. A runner 69 is formed to connect a resin flow path 61a to the injection nozzles 65R, 65L in the heating cylinder 5 and a band heater 67 for heating the runner 69 is provided. Besides, an ejector mechanism 51 is mounted on the cavity retainer plate 11 and the movable retainer plate 13 respectively. Thus it is possible to offset each one half of the resin pressure on each of the parting lines with each other half of the resin pressure on the other parting line.
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