| 摘要 |
<p>A plastics extruder has means 11 for injecting a liquid additive at the region of the end of the extruder barrel 1. The additive is injected at an injection section 10 situated between two mixing sections and of relatively large cross sectional flow area for the molten plastics, through a plurality of injection nozzles 11 arranged around the circumference of the extruder. The injection nozzles which preferably extend to the center of the melt flow, are operated individually by a pump P.</p> |
