Binder film for a fiber optic cable
First Claim
1. A method of manufacturing a fiber optic cable, comprising steps of:
- stranding core elements around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising;
a buffer tube surrounding optical fibers; and
one or more additional core elements, comprising at least one of;
a filler rod, andan additional buffer tube; and
forming a binder film around the core elements to at least partially constrain the core elements, wherein the binder film is continuous peripherally around the core elements and continuous lengthwise along a length of the cable that is at least 10 meters, and wherein coupling between the stranded core elements and the central strength member facilitated by radial tension in the binder film is such that a force to pull and move a 100 mm length of the central strength member through the stranded core elements is a least 5 newtons; and
at least 50 percent by weight of the binder film consists of a polymer with a sub-zero degrees Centigrade glass-transition temperature, whereby the binder film may actively continue to shrimp post-processing, which may facilitate coupling between the core elements and the central strength member.
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Accused Products
Abstract
A fiber optic cable includes a core and a binder film surrounding the core. The core includes a central strength member and core elements, such as buffer tubes containing optical fibers, where the core elements are stranded around the central strength member in a pattern of stranding including reversals in lay direction of the core elements. The binder film is in radial tension around the core such that the binder film opposes outwardly transverse deflection of the core elements. Further, the binder film loads the core elements normally to the central strength member such that contact between the core elements and central strength member provides coupling there between, limiting axial migration of the core elements relative to the central strength member.
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Citations
12 Claims
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1. A method of manufacturing a fiber optic cable, comprising steps of:
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stranding core elements around a central strength member in a pattern of stranding including reversals in lay direction of the core elements, the core elements comprising; a buffer tube surrounding optical fibers; and one or more additional core elements, comprising at least one of; a filler rod, and an additional buffer tube; and forming a binder film around the core elements to at least partially constrain the core elements, wherein the binder film is continuous peripherally around the core elements and continuous lengthwise along a length of the cable that is at least 10 meters, and wherein coupling between the stranded core elements and the central strength member facilitated by radial tension in the binder film is such that a force to pull and move a 100 mm length of the central strength member through the stranded core elements is a least 5 newtons; and at least 50 percent by weight of the binder film consists of a polymer with a sub-zero degrees Centigrade glass-transition temperature, whereby the binder film may actively continue to shrimp post-processing, which may facilitate coupling between the core elements and the central strength member. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification