Heat bulkable polyester yarn

Details Heat bulkable polyester yarn Heat bulkable polyester yarn

D - Textiles, Paper

02

G

28/49

D02G 1/18 (2006.01) D01D 5/22 (2006.01) D01F 6/62 (2006.01)

Patent

CA 1125488

HEAT BULKABLE POLYESTER YARN ABSTRACT OF THE INVENTION The present invention relates to a process and product for directly producing a latent heat-bulkable yarn from the same polymer composition in the same spinning process. The self-crimping yarn is produced from polyethylene terephthalate compositions which are melt spun at high speeds to form a plurality of spin oriented filaments. The filaments are divided in the spinning column into at least two groups and the two groups of filaments are subjected to different heat conditions, recombined, and taken up as a fully drawn yarn. The high spinning speed and differential heat treat- ment are selected to produce highly spin oriented yarn of relatively high spun birefringence with the conditions of spinning speed and heat treatment being controlled to produce a desired shrinkage differential between the two groups of filaments of up to 60 per- cent. The yarn is self-crimped by subsequent heat treatment to effect shrinkage, preferably after being formed into fabric, such as occurs in the hot dyeing and/or scouring of the fabric.

342935

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