Soft stretch yarns and their method of production
AssigneeToray Industries, Inc.
InventorsTakashi Ochi, Katsuhiko Mochizuki, Yuhei Maeda
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Abstract
A soft stretch yarn substantially comprising polyester fibers has a stress, at 50% yarn stretch, of no more than 30×10−3 cN/dtex and, at the same time, a percentage recovery of at least 60%. Preferably, the Uster unevenness is no more than 2.0% and the crimp diameter is no more than 250 μm. This soft stretch yarn can be produced by spinning yarn of conjugate fibers comprising two types of polyester in which one component is PTT at a take-up velocity of at least 1200 m/min, drawing at a drawing temperature of 50 to 80° C. at a draw ratio such that the drawn yarn tensile elongation is 20 to 45%, and then heat setting.
Claims33
A yarn comprising polyester fibers which yarn is characterized in that following heat treatment the yarn has a stress, at 50% yarn stretch, of no more than 30×10−3 cN/dtex and, at the same time, a percentage recovery of at least 60%.
A method of producing a yarn, which method is characterized in that a yarn of conjugate fibers comprising two types of polyester is spun at a take-up velocity of at least 1200 m/min, drawn at a drawing temperature of 50 to 80° C. and heat set.
A method of producing a yarn, which method is characterized in that a yarn of conjugate fibers comprising two types of polyester is spun from a spinneret and taken up at a take-up velocity of at least 4000 m/min by providing a non-contact heater between the spinneret and a godet roller.
A method of producing a yarn, which method is characterized in that a yarn of conjugate fibers comprising two types of polyester is spun at a take-up velocity of at least 5000 m/min.
Dependencies are inferred from the claim text.