Document Type


Date of Award


Degree Name

Master of Science in Chemical Engineering - (M.S.)


Chemical Engineering

First Advisor

C. L. Mantell

Second Advisor

Joseph Joffe

Third Advisor

George C. Keeffe


This thesis reviews the theory of isothermal melt extrusion beginning with the writings of early researchers up to its present state. The isothermal extrusion of a near-Newtonian liquid is compared to polyethylene, using five different extrusion screws, and calculated discharge rates are compared to the actual rates for both materials. A method of calculating forward flow was developed and this was shown to provide very good correlation with actual dis-charge rates.

Non-isothermal or plasticating extrusion of polyethylene was also studied and comparison is made to isothermal melt extrusion. The results obtained with the various types of screws studied are also discussed.



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