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Extrusion of highly oriented polyolefin fibers
Author(s) -
Collier John R.,
Tam Thomas Yiu Tai,
Newcome Jonathan,
Dinos Nicholas
Publication year - 1976
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.760160314
Subject(s) - materials science , extrusion , polyolefin , crystallization , composite material , plastics extrusion , polyethylene , die (integrated circuit) , blow molding , glass fiber , extrusion moulding , melt flow index , molding (decorative) , melting point , mold , polymer , chemical engineering , nanotechnology , layer (electronics) , engineering , copolymer
This study demonstrates that it is possible to extrude highly oriented polyethylene fibers using only a plasticating single screw extruder, specially designed and operated dies, and a simple take up mechanism. The degree of orientation achieved is as high as that achieved in solid state extrusion studies but accomplished at a fraction of the pressure. The degree of orientation is significantly greater than that of commercial grade fibers. The orientation is developed in the elongational flow of the “wine glass stem” region preceding the die entrance and is retained by crystallization in the die. Crystallization is inhibited in the pre‐die region by maintaining a temperature above the effective melting point of the flowing, oriented (hence lowered entropy) melt.