Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1985-12-05
1988-05-10
Silbaugh, Jan H.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
2641761, 26421122, 528190, D01D 508
Patent
active
047434163
ABSTRACT:
An aromatic polyester showing anisotropy in the molten state is melt spun stably for a long period of time by controlling an extrusion pressure at a nozzle portion to 3 kg/cm.sup.2 G or higher and an atmospheric temperature T.sub.N at a nozzle outlet to a degree satisfying the following formula: (T.sub.F -100).ltoreq.T.sub.N .ltoreq.T.sub.F, wherein T.sub.F is a flowing temperature of the aromatic polyester, and preferably controlling the pressure of a polymer melt at a tip outlet of an extruder to 15 kg/cm.sup.2 G or higher, whereby a highly orientated fiber of fine denier is obtained.
REFERENCES:
patent: 3846377 (1974-11-01), Siegmann
patent: 3969462 (1976-07-01), Stofan
patent: 4118372 (1978-10-01), Schaefgen
Kobashi Toshiyuki
Sugimoto Hiroaki
Takao Seiji
Japan Exlan Company Ltd.
Lorin Hubert C.
Silbaugh Jan H.
Sumitomo Chemical Company Limited
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