Document Type
Thesis
Date of Award
6-30-1963
Degree Name
Master of Science in Chemical Engineering - (M.S.)
Department
Chemical Engineering
First Advisor
Jerome J. Salamone
Second Advisor
Michael Frederick
Third Advisor
C. L. Mantell
Abstract
The object of this thesis was to predict the output of an extruder, for thermoplastic materials, by using simplified equations relating output to screw speed and screw geometry.
Three different extruders were used for this purpose and several addition-type polymers were studied. These materials included: stabilized and unstabilized polypropylene, low-density and high-density polyethylene, general-purpose polystyrene and rubber-modified poly-styrene.
The results obtained show that, by using relatively low screw speeds (up to 140 r.p.m.), shallow screw channels and back pressures at the die up to 2000 psig., a theoretical output can be calculated with a maximum deviation from the experimental data of 20%. The theoretical equation for output Q= 2’N is a function only of screw speed (N) and of screw geometry (2’), as shown in Table No. 6, page 55.
The basic assumptions made by the originators of these simplified formulae are many and quite restricting. Just to mention a few of these assumptions;
1) The flow is laminar and Newtonian in character.
2) The extruder is operating under isothermal conditions.
3) Leakage flow is neglected. In view of these simplifying assumptions, it is very interesting to note how closely the calculated outputs approximate the experimental ones.
Recommended Citation
Bergonzoni, Aldo, "Prediction of extruder performance for thermoplastic materials" (1963). Theses. 2765.
https://digitalcommons.njit.edu/theses/2765
