Binder film for a fiber optic cable
First Claim
Patent Images
1. A fiber optic cable, comprising:
- core elements stranded 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;
a binder film surrounding the stranded core elements, wherein the binder film is twisted around the core elements; and
a jacket surrounding the binder film, wherein the jacket is at least five times thicker than the binder film,wherein at least 50 percent by weight of the binder film is a polymer with a sub-zero degrees Centigrade glass-transition temperature, whereby the binder film may actively continue to shrink post-processing, facilitating coupling between the core elements and the central strength member.
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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.
105 Citations
19 Claims
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1. A fiber optic cable, comprising:
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core elements stranded 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; a binder film surrounding the stranded core elements, wherein the binder film is twisted around the core elements; and a jacket surrounding the binder film, wherein the jacket is at least five times thicker than the binder film, wherein at least 50 percent by weight of the binder film is a polymer with a sub-zero degrees Centigrade glass-transition temperature, whereby the binder film may actively continue to shrink post-processing, facilitating 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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13. A method of manufacturing a fiber optic cable, comprising
steps of: -
stranding core elements around a central strength member in a pattern of stranding with a stranding machine on a manufacturing line, 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; extruding a binder film to surround the core elements after stranding the core elements such that the extruding takes place along the manufacturing line; and rotating an extrudate cone of the binder film during the extruding to form a twist in the binder film about the core elements, whereby the extrusion cone quickly draws down onto the core elements. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification