| 摘要 |
PURPOSE:To prevent the clogging of a vent hole with molten resin from occurring and consequently run a molder under a stable deaerated state by a method wherein, even when a screw retreats, the screw keeps on rotating in reduced speed at the specified position in the vent type injection molder. CONSTITUTION:A mechanism, which strikingly reduces the rotational speed of a screw when the screw retreats as far as a position ahead of the metering stop position or preferably 1/10-1/50 of the whole metering stroke ahead thereof by means of a contact provided at the position just mentioned above, is added in a vent type injection molder. Thus, the screw keeps on rotating with no stopping and consequently the material, which is going to swell at a vent part, is caught up in a screw groove and does not clog the vent hole and consequently the stable deaeration of the molder is realized.
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