| 摘要 |
Following screw-plasticization, before injection, the screw is counter-rotated through a set angle, positively closing the non-return valve (2). The zero-displacement point of the screw is set, on stopping counter-rotation. Preferred Features: Counter-rotation describes a set angle, preferably 180 deg or more and/or is continued until a pressure drop is detected in the volume (3) ahead of the screw.
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