D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/612
D01F 6/04 (2006.01) D01D 5/00 (2006.01)
Patent
CA 1169213
ABSTRACT PRODUCTION OF HIGH STRENGTH POLYETHYLENE FILAMENTS Production of polyethylene filaments of tenacity at least 30 g/d from a hot, supersaturated solution of high viscosity polyethylene having intrinsic viscosity of at least 11 d1/g, by contacting a length of such filament (functioning as a seed) simultaneously with a stationary arcuate surface and with such poly- ethylene solution, and withdrawing the filament through the solution in sliding contact around the surface at a rate reaching at least 80 cm per minute thereby produc- ing tension and inducing crystal growth from the solu- tion onto the filament, with increase of tension up to a steady state tension of at least 70 grams. More particularly the polyethylene has intrinsic viscosity of 17-28 d1/g, the solvent is xylene, the surface is composed of PTFE, the polyethylene concentration is 0.1 to 0.5 wgt. percent, the rate of withdrawing the filament is at least 200 cm per minute, and the poly- ethylene seed filament is initially led around the arcuate surface by attaching the filament to an endless loop which is drawn through the solution and around the surface; and then the seed filament is passed to a takeup reel; and afterward (when the tension has reached at least 70g) the seed filament is severed from its supply source while growth of the product fila- ment on the seed filament and from the end thereof pro- ceeds.
393954
Kavesh Sheldon
Prevorsek Dusan C.
Wang Donald G.
Allied Corporation
Gowling Lafleur Henderson Llp
LandOfFree
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