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Importance of elongational properties of polymer melts for film blowing and thermoforming
Author(s) -
Münstedt Helmut,
Kurzbeck Stefan,
Stange Jens
Publication year - 2006
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.20588
Subject(s) - thermoforming , materials science , polypropylene , strain hardening exponent , composite material , polyethylene , blowing agent , elongation , hardening (computing) , polymer , viscoelasticity , ultimate tensile strength , layer (electronics) , polyurethane
Abstract Two polyethylene and two polypropylene melts were characterized in uniaxial elongational flow. They exhibit significant differences with respect to strain hardening. For the polypropylenes it was shown that the elongational behavior found in uniaxial elongation is qualitatively reflected in biaxial deformation too. From the polyethylenes, films were blown using laboratory equipment, and the polypropylenes were processed into beakers by thermoforming. For both materials it could be shown that strain hardening is of advantage for the geometrical uniformity of the processed items. POLYM. ENG. SCI., 46: 1190–1195, 2006. © 2006 Society of Plastics Engineers