Claims
- 1. In a process for producing and spooling preoriented polyester flaments comprising at least 90 weight % (relative to the total weight of the polyester filaments) polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT) the improvement comprising:a) setting the spinline extension ratio in the range of 70 to 500; b) passing the filaments through a cooling delay zone of from 30 mm to 200 mm in length immediately after exiting from the spinning nozzles; c) cooling the filaments to below the PBT or PTMT solidification temperature; d) bundling the filaments into thread at a distance of between 500 mm and 2500 mm from the spinneret plate; e) setting the thread tension in front of and between draw-off galeftes to between 0.05 cN/dtex to 0.20 cN/dtex; f) spooling the thread with a thread tension of between 0.025 cN/dtex to 0.15 cN/dtex; g) adjusting the spooling speed to between 2200 m/mm. and 3500 m/mm.
- 2. The process according to claim 1, wherein the PBT and PTMT are used with an intrinsic viscosity in the range from 0.7 dl/g to 0.95 dl/g.
- 3. The process according to claim 1, wherein the temperature in the vicinity of the thread coil is set to ≦45° C. during the spooling.
- 4. The process according to claim 1, further comprising storing the spooled thread for at least 4 hours at 12 to 35° C. and at 40 to 85% relative humidity.
- 5. Preoriented polyester filaments comprising at least 90 weight % (relative to the total weight of the polyester filaments) polybutylene terephthalate (PBT) and/or polytrimethylene terephthalate (PTMT), wherein after 4 weeks of storage under normal conditions in accordance with DIN 53802 the filaments have the following properties:a) an elongation at break of between 90 and 165%; b) a boiling-water shrinkage of at least 30%; c) a normal uster below 1.1%; d) a birefringence between 0.030 and 0.058; e) a density less than 1.35 g/cm3; f) a coefficient of variation of the maximum tensile strength of ≦4.5%; and g) a coefficient of variation of the elongation at break of 4.5%.
- 6. A process for the production of bulky polyester filaments, the process comprising processing the filaments of claim 5 into bulky threads in a stretch texturing machine at a speed of at least 500 m/mm. and a stretching ratio of at least 1:1.35.
- 7. Bulky polyester SET filaments having a tenacity at break is >26 cN/tex and an elongation at break is >36%.
- 8. Bulky polyester HE filament having a tenacity at break of more than 26 cN/tex and an elongation at break of more than 30%.
- 9. The process according to claim 1 wherein the polyester filaments comprise at least 90 weight % (relative to the total weight of the polyester filaments) polytrimethylene terephthalate (PTMT).
- 10. The preoriented polyester filaments according to claim 5, wherein the density is less than 1.33 g./cm3.
- 11. The process according to claim 1 wherein the preoriented polyester filaments comprise at least 90 weight % (relative to the total weight of the polyester filaments) polytrimethylene terephthalate (PTMT).
Priority Claims (1)
Number |
Date |
Country |
Kind |
100 54 422 |
Nov 2000 |
DE |
|
Parent Case Info
This is a continuation-in-part of U.S. patent application Ser. No. 10/000,290, filed Nov. 2, 2001 which claims the benefit of U.S. Provisional Patent Application Ser. No. 60/263,013, filed Jan. 19, 2001.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3975488 |
Patterson |
Aug 1976 |
A |
Foreign Referenced Citations (3)
Number |
Date |
Country |
1033422 |
Sep 2000 |
EP |
2001020136 |
Jan 2001 |
JP |
0166836 |
Sep 2000 |
WO |
Provisional Applications (1)
|
Number |
Date |
Country |
|
60/263013 |
Jan 2001 |
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
10/000290 |
Nov 2001 |
US |
Child |
10/179665 |
|
US |