| 摘要 |
The present invention concerns a screw for moving plastic through a barrel in a direction of flow from a drive to a tip. The screw has a shaft having opposing first and second ends, a drive located on the first end of the shaft, a tip located on the second end of the shaft, and a flight helically extending around the shaft. The shaft also has a section of decreasing diameter in the flow direction and a section of increasing in diameter in the flow direction.
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