Cable having core, jacket and polymeric jacket access features located in the jacket
Cables jacket are formed by extruding discontinuities in a main cable jacket portion. The discontinuities allow the jacket to be torn to provide access to the cable core. The armor cables have an armor layer with armor access features arranged to work in combination with the discontinuities in the cable jacket to facilitate access to the cable core.
1. A jacket for a cable core comprising:
a primary portion of a first extrudate polymeric material;
at least one jacket discontinuity of a second extrudate polymeric material in the primary portion, the discontinuity extending along a length of the cable, and the first material being different from the second material, wherein a bond between the discontinuity and the primary portion allows the jacket to be separated at the discontinuity; and
a buffer tube having at least one buffer tube discontinuity and an outside surface at least partially bonded to the primary portion, wherein the at least one jacket discontinuity and the at least one buffer tube discontinuity are aligned to provide access to the core.
2. The jacket of claim 1 , wherein the at least one jacket discontinuity comprises a first jacket discontinuity and a second jacket discontinuity.
3. The jacket of claim 2 , wherein each jacket discontinuity is bonded with the primary portion of the jacket, and wherein a section of the primary portion located between the first and second jacket discontinuities is separable from a remainder of the jacket by a peel force of less than 80 Newtons (N) exerted on the section.
4. The jacket of claim 3 , wherein the peel force is less than 50N.
5. The jacket of claim 1 , wherein the first extrudate polymeric material is comprised of at least eighty percent by weight of a first polymer, and wherein the second extrudate polymeric material is comprised of at least seventy percent by weight of a second polymer and at least 0.5 percent by weight of the first polymer.
6. The jacket of claim 5 , wherein the first polymer is polyethylene and second polymer is polypropylene.
7. The jacket of claim 1 , wherein the at least one jacket discontinuity has a maximum width measured perpendicular to a radius of the cable passing through the discontinuity that is less than 0.2 mm.
8. A method of accessing a cable core, the method comprising:
cutting or pinching a jacket surrounding the core such that a jacket section begins separating between a plurality of discontinuities embedded in the jacket, the jacket section being comprised of a first extrudate polymeric material different from a second extrudate polymeric material comprising the plurality of discontinuities;
pulling the jacket section away from the jacket such that the jacket continues to tear lengthwise along the discontinuities; and
peeling back a section of the buffer tube between buffer tube discontinuities, wherein the buffer tube is at least partially bonded to the jacket section.
9. The method of claim 8 , further comprising:
peeling back a section of armor between armor access features to access the core.
10. The method of claim 9 , wherein the peeling back of the section of armor occurs simultaneously with the pulling of the jacket section away from the jacket.