| 摘要 |
<p>A spiral-line press with a double contra-screw arrangement fixed on a single shaft. Each of the screws on the spiral-line press have a length/diameter ratio of less than or equal to 14/1 and a combined L/D - ratio of less than or equal to 28/1. In addition, the phase depth of the metering zones are less than or equal to 1/25th of the spiral diameter and the peripheral speed of the spiral-line press is greater than or equal to 0.3 m/sec. The output from the metering zones of the spiral-line press are extruded by an outlet fitting which transforms the flows of the extruded matter so that one output is extruded concentrically around the other.</p> |
