Monsanto Company

Celanese Gmbh

Fiber Industries, Inc.

Darwyn E Walker

Wayne T Mowe

James E Bromley

John R Dees

Harold M Familant

Michael M McNamara

Polyester polymer is extruded through converging capillaries at different speeds to merge and form a combined stream. The stream is cooled to form a filament, which is withdrawn at a high speed. A plurality of such filaments are combined into yarn which self-crimps upon heating. In some embodiments, the yarn has a variable denier.

Self-crimping yarn

Two molten streams of polyester polymer are extruded at different speeds to intersect below the spinneret. The spinning speed is relatively high, and the resulting filament has shrinkage peaks and valleys along its length. When a number of such filaments are relaxed in a yarn bundle, the yarn spontaneously develops crimp.

Self crimping yarn and process

Polyamide yarn is melt spun at high speed and drawn almost immediately (between 0.002 and 0.25 seconds) after solidification. Turbine driven feed roll replaces conventional feed and separator roll. Process displays unusually low drawing tension, exceptionally uniform yarn.

Nylon 66 spinning process

Growing community of inventors

Wilbraham, MA, United States of America

Darwyn E Walker