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Orientation of LCP blown film with rotating dies
Author(s) -
Lusignea Richard W.
Publication year - 1999
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.11621
Subject(s) - materials science , extrusion , tube (container) , composite material , elongation , shear (geology) , volume (thermodynamics) , orientation (vector space) , die (integrated circuit) , polymer , blow molding , mold , nanotechnology , geometry , ultimate tensile strength , physics , mathematics , quantum mechanics
Liquid crystal polymers (LCPs) have been commercially available for over 10 years, but their use has been limited almost entirely to injection molded parts, totaling only about 7.5 million kg per year. Much larger volume uses of LCP in film, tube, pipe and extruded parts have not been exploited because of uncontrolled orientation in LCP. This paper explains how shear and elongation forces, controlled by rotating extrusion dies, orient LCP film, tube and other extruded parts. Applications to electronic, medical and high barrier packaging markets are discussed.