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Orientation development in the tubular film extrusion of polypropylene
Author(s) -
Shimomura Yasushi,
Spruiell Joseph E.,
White James L.
Publication year - 1982
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.1982.070270733
Subject(s) - polypropylene , materials science , extrusion , birefringence , orientation (vector space) , composite material , polyethylene , bubble , tension (geology) , optics , geometry , ultimate tensile strength , mechanics , mathematics , physics
A basic study of orientation development in the tubular film extrusion of polypropylene is reported. WAXS and birefringence measurements were carried out on films prepared under conditions of known blowup ratio B , drawdown ν L /ν O , machine direction tension, and bubble pressure. Pole figures were constructed and biaxial orientation factors determined. The use of an orientation factor triangle diagram was found to be a useful method of representing the variation of orientation with processing conditions. The variation in orientation with processing parameters for polypropylene was found to have similar behavior to that previously found for polyethylene.