Abstract Yarn of polyester filaments having a random distribution along the filament length of thick and thin sections, which differ in dye uptake, is produced by incompletely drawing a spin-oriented yarn, preferably one prepared by melt-spinning polyethylene terephthalate into yarn while withdrawing the yarn from the spinneret at a take-off speed of 3000 to 4000 yards per minute. The spin-oriented yarn is drawn on a hot draw pin of about 1.3 to 6 cm in diameter, using a draw ratio which is 82 to 95 percent of the draw ratio needed to fully draw the yarn. The incompletely drawn yarn can be false-twist textured under conditions conventionally used for fully drawn polyester yarn. The textured yarn provides attractive dyed fabrics due to darker shades of color in the thick filament sections.
In the production of yarn of polyester filaments having a random distribution along the filament length of thick and thin sections differing in dyeability, by incompletely drawing as-spun yarn on a draw pin of about 1.3 to 6 cm. in diameter maintained at 60° to 90° C.; the improvement for producing a textured yarn which comprises drawing a spin-oriented polyester yarn at 82 to 95 percent of a draw ratio that would fully draw the yarn and then false-twist texturing the incompletely drawn yarn at a heater temperature greater than 200° C. for heat-setting twist in the yarn.
Claim 2
Dependent Claim
98 words
In the production of yarn of polyester filaments having a random distribution along the filament length of thick and thin sections differing in dyeability, by incompletely drawing as-spun yarn on a draw pin of about 1.3 to 6 cm. in diameter maintained at 60° to 90° C.; the improvement for producing a textured yarn which comprises drawing a spin-oriented polyester yarn at 82 to 95 percent of a draw ratio that would fully draw the yarn and then false-twist texturing the incompletely drawn yarn at a heater temperature greater than 200° C. for heat-setting twist in the yarn.