E.i. Dupont De Nemours and Company

Benjamin C Sze

George Vassilatos

An improved melt spinning process for preparing nylon filaments wherein the freshly-extruded filaments enter an enclosed zone that is maintained at superatmospheric pressure by a controlled flow of air at low positive pressure and the filaments leave the zone through a constriction, either a venturi or a tube, assisted by the cocurrent flow of such air at a high controlled velocity.

Melt spinning process for polyamide industrial filaments

A melt-spinning process for spinning polymeric filaments at a spinning speed controlled by a positive mechanical withdrawal means that increases the speed of the filaments to above 7,000 meters/minute whereby a drawing and necking down of the filaments occur below the spinning pack, directing a gas into a zone extending from the spinning pack to a location between the spinning pack and the withdrawal means, maintaining the zone under superatmospheric pressure of less than 0.03 kg/cm2 and increasing the velocity of the gas as it leaves the zone to a level greater than the velocity of the filaments to reduce the extent of necking down of the filaments.

Melt spinning process for polymeric filaments

Improved polymeric filaments spun at high withdrawal speeds of the order of more than 5 km/min, and preferably of 7-12 km/min, wherein the freshly-extruded filaments enter an enclosed zone that is maintained at superatmospheric pressure by a controlled flow of heated air at a low positive pressure.

Uniform polymeric filaments

A bulked dimensionally stable yarn composed of a plurality of crimped and straight filaments randomly disposed throughout the cross-section of the yarn, said crimped filaments provide bulk and said straight filaments provide dimensional stability.

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Wilmington, DE, United States of America

Benjamin C Sze