Claims
- 1. 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. at a draw ratio such that the drawn yarn tensile elongation is 20 to 45% and heat set.
- 2. A method according to claim 1, which is a direct spin draw method.
- 3. 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, which is a 2-stage spinning and drawing method in which yarn is temporarily wound following the spinning and then drawn.
- 4. A method of producing a yarn, which method is characterized in that a yarn of conjugate fibres 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.
- 5. A method of producing a yarn, which method is characterized in that a yarn of conjugate fibers comprising two types of polyester, where at least one component of the conjugate fibers is polytrimethylene terephthalate is spun at a take-up velocity of at least 5000 m/min.
- 6. A method of producing a yarn according to claim 1, where the spinning temperature is 250 to 280° C.
- 7. A method of producing a yarn according to claim 1, where the melt viscosity ratio of the two types of polyester is from 1.05:1 to 5.00:1.
- 8. 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 wherein the yarn produced substantially comprises polyester fibers, which yarn has, following heat treatment, a stress at 50% yarn stretch is no more than 30×10−3 cN/dtex and at the same time, a percentage recovery is at least 60%.
- 9. The method of producing a yarn according to claim 1, where at least one component of the conjugate fibers is polytrimethylene terephthalate.
- 10. The method of producing a yarn according to claim 3, where at least one component of the conjugate fibers is polytrimethylene terephthalate.
- 11. The method of producing a yarn according to claim 8, where at least one component of the conjugate fibers is polytrimethylene terephthalate.
Priority Claims (2)
Number |
Date |
Country |
Kind |
11-160548 |
Jun 1999 |
JP |
|
11-238240 |
Aug 1999 |
JP |
|
RELATED APPLICATION
This application is a divisional of U.S. patent application Ser. No. 09/589,233, filed Jun. 7, 2000, now U.S. Pat. No. 6,306,499, issued Oct. 23, 2001.
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