| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that the screw of a heating cylinder is separated from a molten resin to involve gas according to circumstances when the screw is allowed to retreat at a higth speed when the molten resin at the leading end of the screw is modified by finely vibrating the screw. SOLUTION: The advance of the screw 12 is performed by supplying oil pressure to an oil chamber 17 and the retreat thereof is performed by the pressure of the molten resin 29. Since the screw is allowed to retreat by the reaction force of the molten resin, there is no anxiety such that the screw is separated from the molten resin and the penetration of gas can be prevented and the quality of a molded product can be kept well.
|
