The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 26, 1978
Filed:
May. 02, 1977
Jerzy Spolnicki, Camden, SC (US);
E. I. Du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
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.