Claims
- 1. A process for improving the properties of a feed yarn of undrawn polyester filaments, characterized in that said feed yarn of undrawn polyester filaments is partially drawn to a uniform yarn by hot-drawing or by cold-drawing, with or without heat-setting, and that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 120%, tenacity at 7% elongation (T.sub.7) at least about 0.7 grams/denier, boil-off shrinkage (S.sub.1) less than about 10%, thermal stability as shown by an S.sub.2 value less than about +1%, net shrinkage (S.sub.12) less than about 8%, maximum shrinkage tension (ST) less than about 0.3 grams/denier, density (.rho.) about 1.35 to about 1.39 grams/cubic centimeter, and crystal size (CS) about 55 to about 90 .ANG. and also at least about the following value in relation to the density:
- CS>(250.rho.-282.5).ANG..
- 2. A process for improving the properties of a feed yarn of undrawn polyester filaments, characterized in that said feed yarn of undrawn polyester filaments is drawn by cold-drawing, and that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 120%, tenacity at 7% elongation (T.sub.7) at least about 0.7 grams/denier, boil-off shrinkage (S.sub.1) less than about 10%, thermal stability as shown by an S.sub.2 value less than about +1%, net shrinkage (S.sub.12) less than about 8%, maximum shrinkage tension (ST) less than about 0.3 grams/denier, density (.rho.) about 1.35 to about 1.39 grams/cubic centimeter, and crystal size (CS) about 55 to about 90 .ANG. and also at least about the following value in relation to the density:
- CS>(250.rho.-282.5).ANG..
- 3. A process for improving the properties of a feed yarn of undrawn polyester filaments, characterized in that said feed yarn of undrawn polyester filaments is drawn by hot-drawing, without any post heat-treatment, and that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 120%, tenacity at 7% elongation (T.sub.7) at least about 0.7 grams/denier, boil-off shrinkage (S.sub.1) less than about 10%, thermal stability as shown by an S.sub.2 value less than about +1%, net shrinkage (S.sub.12) less than about 8%, maximum shrinkage tension (ST) less than about 0.3 grams/denier, density (.rho.) about 1.35 to about 1.39 grams/cubic centimeter, and crystal size (CS) about 55 to about 90 .ANG. and also at least about the following value in relation to the density:
- CS>(250.rho.-282.5).ANG..
- 4. A process for improving the properties of a feed yarn of undrawn polyester filaments, characterized in that said feed yarn of undrawn polyester filaments is drawn by hot-drawing, with post heat-treatment to reduce shrinkage, at such draw ratio as to provide a drawn yarn of elongation-to-break at least about 30%, and that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 120%, tenacity at 7% elongation (T.sub.7) at least about 0.7 grams/denier, boil-off shrinkage (S.sub.1) less than about 10%, thermal stability as shown by an S.sub.2 value less than about +1%, net shrinkage (S.sub.12) less than about 8%, maximum shrinkage tension (ST) less than about 0.3 grams/denier, density (.rho.) about 1.35 to about 1.39 grams/cubic centimeter, and crystal size (CS) about 55 to about 90 .ANG. and also at least about the following value in relation to the density:
- CS>(250.rho.-282.5).ANG..
- 5. A process according to any one of claims 1, 2 or 3, wherein the feed yarn is drawn using a draw ratio such as to provide a drawn yarn of elongation-to-break at least 10%.
- 6. A process according to claim 5, wherein said draw ratio is such as to provide a drawn yarn of elongation-to-break at least 30%.
- 7. A process according to anyone of claims 1 to 4, wherein heat-treatment is carried out a temperature greater than 70.degree. C. and less than about 240.degree. C.
- 8. A process according to claim 1 or 2, wherein the feed yarn is drawn with post heat-treatment to reduce shrinkage.
- 9. A process according to claim 3 or 4, wherein said feed yarn of undrawn polyester filaments i drawn by hot-drawing at a temperature greater than 70.degree. C. and less than about 240.degree. C.
- 10. A process according to any one of claims 1 to 4, characterized in that said feed yarn is of boil-off shrinkage (S.sub.1) and of net shrinkage (S.sub.12) each less than about 6%.
- 11. A process according to any one of claims 1 to 4 characterized in that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 90%, and of tenacity at 7% elongation (T.sub.7) at least about 0.8 grams/denier.
- 12. A process according to any one of claims 1 to 4 characterized in that said feed yarn is of elongation-to-break (E.sub.B) about 40 to about 90%, and of tenacity at 7% elongation (T.sub.7) is at least about 0.8 grams/denier and less than about 1.2 grams/denier.
- 13. A process according to any one of claim 1 to 4, characterized in that said feed yarn is of maximum shrinkage tension (ST) less than about 0.15 grams/denier.
Parent Case Info
This is a division of application Ser. No. 07/338,251, filed Apr. 14, 1989, now U.S. Pat. No. 5,066,447, being itself a continuation-in-part of application Ser. No. 07/053,309, filed May 22, 1987, now abandoned, which is itself a continuation-in-part of application Ser. No. 824,363, filed Jan. 30, 1986, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (2)
Number |
Date |
Country |
3018373 |
Nov 1983 |
DEX |
3328449 |
Feb 1985 |
DEX |
Non-Patent Literature Citations (2)
Entry |
F. Maag, Production of Warps from Flat Synthetic Filament Yarns, Textile Month, May 1984, pp. 48, 49, 50. |
Frank Hunter, Draw-Beaming, Fiber World, Sep. 1984 pp. 61-68. |
Divisions (1)
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Number |
Date |
Country |
Parent |
338251 |
Apr 1989 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
53309 |
May 1987 |
|
Parent |
824363 |
Jan 1986 |
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