The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Application of theory to extrusion of polyethylene
Author:	Griesser, Ernest Edward
View Online:	njit-etd1955-013 (III, 82 pages ~ 8.1 MB pdf)
Department:	Department of Chemical Engineering
Degree:	Master of Science
Program:	Chemical Engineering
Document Type:	Thesis
Advisory Committee:	Mantell, C. L. (Committee chair) Joffe, Joseph (Committee member) Keeffe, George C. (Committee member)
Date:	1955-05
Keywords:	Polyethylene Extrusion process
Availability:	Unrestricted
Abstract:	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.