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Basic study of extrusion of polyethylene and polystyrene foams
Author(s) -
Oyanagi Yasushi,
White James L.
Publication year - 1979
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1979.070230406
Subject(s) - die swell , extrusion , blowing agent , materials science , rheology , composite material , viscosity , bubble , polystyrene , polyethylene , die (integrated circuit) , polymer , mechanics , physics , polyurethane , nanotechnology
A fundamental study of bubble morphology development and apparent rheological properties in foam extrusion is reported. The influence of melt temperature, die length/diameter ratio, and blowing agent level on the morphology are considered. Measurements of the influence of blowing agent on viscosity, extrudate swell, and end‐pressure losses are described. The viscosity is reduced, but extrudate swell is increased. End‐pressure losses were found to become very large relative to the die wall shear stress at low extrusion rates. These results were interpreted in terms of bubble development. The filling of molds by foaming melts was observed and is described.