High-DPF yarns with improved fatigue
View Patent ↗A product includes a dimensionally stable polymeric multifilament yarn having a decitex per fiber count DPF of at least 7.5 and a fatigue strength retention FR, wherein preferred yarns are spun and drawn such that FR increases when DPF increases. Particularly preferred yarns are fabricated from poly(ethylene terephthalate) and have a DPF of between 10 and 20.
1. A product comprising a dimensionally stable polymeric multifilament yarn having a decitex per fiber count DPF of at least 7.5, wherein the yarn has a dimensional stability of no more than 12, and wherein the dimensional stability is defined by a sum of elongation E, and thermal shrinkage TS.
2. The product of claim 1 wherein the multifilament yarn comprises a polyester.
3. The product of claim 2 wherein the DPF is between 10 and 20.
4. The product of claim 1 wherein the yarn is twisted, or twisted in a cord, and at least partially disposed within a rubber, and wherein the cord has a twist (single×cable TPM) of 420×420 for an 1100 decitex yarn and a fatigue strength retention of at least 90% after 40000 cycles.
5. The product of claim 1 wherein the yarn is twisted, or twisted in a cord, and at least partially disposed within a rubber, and wherein the cord has a twist (single×cable TPM) of 470×470 for 1100 decitex yarn and a fatigue strength retention of at least 97% after 40000 cycles.
6. A product comprising:
a dimensionally stable polymeric multifilament yarn having a decitex per fiber count DPF of at least 7.5 and a fatigue strength retention FR, wherein the yarn is spun and drawn such that FR increases when DPF increases; and
wherein the yarn has a dimensional stability of no more than 12, wherein the dimensional stability is defined by a sum of elongation E x and thermal shrinkage TS.
7. The product of claim 6 wherein the multifilament yarn comprises a polyester.
8. The product of claim 6 wherein DPF is between 10 and 20.
9. The product of claim 6 wherein the dimensionally stable polymeric multifilament yarn has a decitex per filament of at least 7.5 and a treated cord strength retention of at least 70% absolute after 40000 cycles for a twist multiplier of 18760.
10. The product of claim 6 wherein the dimensionally stable polymeric multifilament yarn has a decitex per filament of at least 7.5 and a treated cord strength retention of at least 85% after 40000 cycles absolute for a twist multiplier of 20636.
11. The product of claim 6 wherein the dimensionally stable polymeric multifilament yarn has a decitex per filament of at least 7.5 and a treated cord strength retention of at least 96% after 40000 cycles absolute for a twist multiplier of 22043.