Low shrink and small bend performing drop cable
View Patent ↗Embodiments of an optical fiber cable are provided. The optical fiber cable includes at least one optical fiber, a buffer tube surrounding the at least one optical fiber, and at least one tensile element wound around the buffer tube. The at least one tensile element has a laylength of at least 200 mm. The optical fiber cable also includes an exterior jacket surrounding the tensile element. The exterior jacket is made up of at least one polyolefin, at least one thermoplastic elastomer, and at least one high aspect ratio inorganic filler. Further, the exterior jacket has an averaged coefficient of thermal expansion of no more than 120(10 −6 ) m/mK.
1. An optical fiber cable, comprising:
at least one optical fiber;
a buffer tube surrounding the at least one optical fiber;
at least one tensile element wound around the buffer tube, the at least one tensile element having a laylength of at least 200 millimeters; and
an exterior jacket surrounding the at least one tensile element, the exterior jacket comprising:
at least one polyolefin;
at least one thermoplastic elastomer; and
at least one high aspect ratio inorganic filler;
wherein the exterior jacket has an averaged coefficient of thermal expansion (CTE) of no more than 120(10 −6 ) m/m*K.
2. The optical fiber cable of claim 1 , wherein the at least one tensile element forms a continuous layer around a circumference of the buffer tube.
3. The optical fiber cable of claim 1 , wherein the at least one tensile element forms a discontinuous layer around a circumference of the buffer tube.
4. The optical fiber cable of claim 1 , wherein the at least one tensile element includes at least one strand comprising filaments of at least one of an aramid, a carbon fiber, an ultra-high molecular weight polyethylene, an ethylene chlorotrifluoroethylene, a polybenzimidazole, a perfluoroalkoxy, a polytetrafluoroethylene, a polyphenylene sulfide, a liquid crystal polymer, or a polyphenylene benzobisoxazole.
5. The optical fiber cable of claim 1 , wherein the at least one polyolefin comprises at least one of medium-density polyethylene (HDPE), high-density polyethylene (HDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), or polypropylene (PP).
6. The optical fiber cable of claim 1 , wherein the at least one thermoplastic elastomer comprises at least one of ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-octene, ethylene-hexene, ethylene-butene, ethylene-vinyl acetate, or styrene-ethylene-butadiene-styrene.
7. The optical fiber cable of claim 1 , wherein the exterior jacket comprises from 30% to 60% by weight of the at least one thermoplastic elastomer, from 5% to 30% by weight of the at least one high aspect ratio inorganic filler, and with the remainder being the at least one polyolefin and/or other additives.
8. The optical fiber cable of claim 7 , wherein the other additives comprise at least one of a compatibilizer, a dispersant, or carbon black.
9. The optical fiber cable of claim 1 , wherein the exterior jacket has a yield stress of at least 5 MPa at 23° C., a strain break of at least 400% at 23° C., and an elastic modulus of less than 2000 MPa at −40° C.
10. The optical fiber cable of claim 1 , wherein the exterior jacket has a thermal contraction stress of 6 MPa or less.
11. The optical fiber cable of claim 1 , wherein the at least one high aspect ratio filler comprises a plate-like filler having particles with a length to thickness ratio of at least 5:1 on average and with a width to thickness ratio of at least 5:1 on average.
12. The optical fiber cable of claim 11 , wherein the plate-like filler is at least one of mica, talc, montmorillonite, kaolinite, bentonite, or synthetic clay.
13. The optical fiber cable of claim 1 , wherein the high aspect ratio filler comprises a rod-like filler having particles with a length to thickness ratio of at least 5:1 on average.
14. The optical fiber cable of claim 13 , wherein the rod-like filler comprises at least one of wood flour, glass fiber, halloysite, wollastonite, magnesium oxysulfate, or a reinforced fiber.
15. The optical fiber cable of claim 1 , further comprising:
an interior jacket comprising a flame retardant, non-corrosive polymer surrounding the at least one tensile element; and
at least one tensile strand interposed between the interior jacket and the exterior jacket.
16. The optical fiber cable of claim 15 , wherein the at least one tensile strand comprises glass fibers.
17. The optical fiber cable of claim 1 , wherein the laylength of the at least one tensile element is no more than 2 meters.
18. A cable, comprising:
at least one conductor;
at least one tensile element wound around the at least one conductor, the at least one tensile element having a laylength of at least 500 millimeters; and
an exterior jacket surrounding the at least one tensile element, the exterior jacket comprising:
from 30% to 60% by weight of at least one polyolefin;
from 30% to 60% by weight of at least one thermoplastic elastomer; and
from 5% to 30% by weight of at least one inorganic filler.
19. The cable of claim 18 , wherein the at least one tensile element includes a strand of at least one of an aramid, a carbon fiber, an ultra-high molecular weight polyethylene, an ethylene chlorotrifluoroethylene, a polybenzimidazole, a perfluoroalkoxy, a polytetrafluoroethylene, a polyphenylene sulfide, a liquid crystal polymer, or a polyphenylene benzobisoxazole.
20. The cable of claim 18 , wherein the at least one polyolefin includes at least one of medium-density polyethylene, high-density polyethylene, low-density polyethylene, linear low-density polyethylene, or polypropylene; and
wherein the at least one thermoplastic elastomer includes at least one of ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-octene, ethylene-hexene, ethylene-butene, ethylene-vinyl acetate, or styrene-ethylene-butadiene-styrene.