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Brought to you by:
The SPE Extrusion Division
Board of Directors

and

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1981 Design of Two-Stage Extractor-Screws

Dr. Paul H. Squires, Principal Consultant - DuPont Company


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Summary

A basis for design of two-stage extractor screws is developed with special focus on determinng optimum design of the final pumping section to maximize pressure-generating capability. Departure from the conventional square-pitch helix angle of 17.7 deg appears justified in this section of the screw where pressure-development capability is critical to successful performance. Optimization can product gains of 5 to 30% in pressure (or in corresponding length reductions) -- the exact benefits depending on the non-newtonian behavior of the melt and on the optimization strategy selected.

For the remainder of the paper, please use the link below.



To view the entire paper, please use the following link: Best Paper 1981.pdf