E.i. Dupont De Nemours and Company

Jerzy Spolnicki

Joshua Benin

David A Wilson

Gary L Caldwell

James F McKinney

Gang Jin

William M Ollinger

Charles S Huffer

George W Goldman

A spinning cell for dry spinning spandex by extruding filaments from a nonuniform array of spinneret capillary groups in a rectangular bar and contacting them with a cross-flow of hot, inert gas is provided.

Spinning cell and method for dry spinning spandex

Polyester yarn having the desirable crimp properties of false-twist textured, heat-set yarn is produced from melt-spun and drawn bicomponent filaments wherein poly(ethylene terephthalate) of 12 to 15 relative viscosity is one component and a copolyester of 23 to 26 relative viscosity, preferably poly(ethylene/2,2-dimethyl-1,3-propylene terephthalate) containing about 90 mole percent ethylene terephthalate units, is the other component. The bicomponent filaments are annealed at constant length to crystallize the polyethylene terephthalate component, forwarded in a jetted stream of heated compressible fluid, impinged in a plasticized condition against a moving screen, cooled and then taken up from the screen. The process can be operated continuously at high speeds, e.g., windup speeds of 3,000 to 4,000 meters per minute.

Product and process

Growing community of inventors

Fisherville, VA, United States of America

Jerzy Spolnicki