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US 4,359,441 AGranted
Polymeric filaments and process for forming such material
AssigneeImperial Chemical Industries PLC
InventorsIvan Barker, Geoffrey Marshall
Life of this patent
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Abstract
Process and apparatus for modifying melt spun filaments after extrusion and solidification by tensioning and exposing to a heated fluid environment. By this invention it is possible to directly form a melt spinnable filamentary yarn having properties similar to those of drawn yarns.
Claims11
A process for forming polyethylene terephthalate filamentary material comprising:
- (a) extruding the polyethylene terephthalate while molten to form filaments;
- (b) advancing the molten filaments through a solidification zone;
- (c) advancing the solidified filaments through a tensioning zone comprising one or more non-rotatable filament contact guides without inducing substantial drawing thereof within the zone;
- (d) advancing the solidified filaments through a subsequent treatment zone into which fluid heated to a temperature above the glass-transition temperature of the filaments is introduced into the treatment zone at a point close to the entry point of the filaments into the zone;
- (e) withdrawing the filaments from the treatment zone at a velocity of from 1000 to 6000 meters/minute.
2 more elements
Dependencies are inferred from the claim text.