Premium
Thermodynamic aspects in extrusion of wall‐slipping materials
Author(s) -
Mennig G.,
Subramanian N.
Publication year - 1982
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760221204
Subject(s) - slipping , materials science , extrusion , plastics extrusion , slip (aerodynamics) , polymer , composite material , polyethylene , enthalpy , vinyl chloride , thermodynamics , mechanics , mechanical engineering , physics , engineering , copolymer
Abstract Relevant calculations are made based on the application of the first law of thermodynamics to a steady polymer flow through a plasticating extruder. The results obtained for various processing conditions for poly(vinyl chloride), which exhibits a slip at the wall during flow at lower temperatures, are compared with polyethylene showing no such slip. For a wall‐slipping material, it is observed that, with increasing throughputs the addition of enthalpy per unit mechanical energy increases (1), the net‐specific thermal energy input increases (2), and the specific mechanical energy required shows a decreasing trend (3). Contrary behavior is found in the case of non‐slipping materials.