Claims
- 1. A process for producing a composite crimped yarn, comprising: doubling at least two kinds of multifilament yarns, one of them being a conjugate multifilament yarn comprising two kinds of polyester polymers different from each other in the heat shrinkability, the other of them being a multifilament yarn of a single synthetic polymer having an elongation larger than that of said conjugate multifilament yarn within a range of an elongation difference of 55%; and false twisting said at least two kinds of multifilament yarns with a composite false twisting method to give a composite crimped yarn comprising a crimped conjugate multifilament yarn and a crimped multifilament yarn having a larger length in a yarn length difference of 5 to 35% than said crimped conjugate multifilament yarn.
- 2. A process for producing a composite crimped yarn according to claim 1, wherein said multifilament yarn of a single synthetic polymer is a thick and thin yarn.
- 3. A process for producing a composite crimped yarn according to claim 1, wherein said multifilament yarn of a single synthetic polymer is a thick and thin yarn composed of polyester which has a birefringence within a range of 15.times.10.sup.-3 to 80.times.10.sup.-3 in its thick portion and a birefringence within a range of 90.times.10.sup.-3 to 200.times.10.sup.-3 in its thin portion.
Priority Claims (2)
Number |
Date |
Country |
Kind |
3-246393 |
Sep 1991 |
JPX |
|
4-044946 |
Mar 1992 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 08/192,743 filed Feb. 7, 1994 U.S. Pat. No. 5,422,171; which is a division of 07/951,998 filed Sept. 24, 1992 U.S. Pat. No. 5,307,614.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3023483 |
Steiner |
Mar 1962 |
|
4365466 |
Horiuchi et al. |
Dec 1982 |
|
4541196 |
Iohara et al. |
Jun 1984 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
61528 |
Mar 1989 |
JPX |
210076 |
Aug 1990 |
JPX |
Divisions (2)
|
Number |
Date |
Country |
Parent |
192743 |
Feb 1994 |
|
Parent |
951998 |
Sep 1992 |
|