Methods of controlling jacket bonding with cable armor and water blocking at strength members
View Patent ↗An armored cable having a polymer covering where the bond between the armor and the covering is controlled by introducing particulate matter at the interface of the armor and covering. A filler material is applied to the exterior surfaces of the cable strength elements in order to inhibit the formation of voids in the polymer covering that would otherwise promote water migration along the cable.
1. An armored fiber optic cable, comprising:
a fiber optic cable core including at least one optical fiber capable of conveying optical signals;
armor at least partially enclosing the core;
particulate matter disposed on an exterior surface of the armor;
at least one strength element adjacent to the armor;
a covering over the armor and the particulate matter and at least partially embedding the at least one strength element; and
filler material covering at least a portion of an exterior of the at least one strength element, the filler material being of different composition than the covering, and at least a portion of the filler material being located between the at least one strength element and the armor.
2. The cable of claim 1 , wherein the covering comprises a polymer.
3. The cable of claim 2 , wherein the particulate matter comprises at least one of mineral particulates and hydrophilic particles.
4. The cable of claim 3 , wherein the particulate matter is selected from the group consisting of: superabsorbent polymer, clay, and talc.
5. The cable of claim 2 , wherein at a transverse cross section of the cable, the filler material contacts an exterior of the armor along a length of the armor that is at least 40% of a major cross sectional dimension of the at least one strength element.
6. The cable of claim 2 , wherein the filler material has a lower melt temperature than that of the covering.
7. The cable of claim 6 , wherein the molecular weight of the covering is at least ten percent greater than the molecular weight of the filler material.
8. The cable of claim 6 , wherein the molecular weight of the covering is at least fifty percent greater than the molecular weight of the filler material.
9. The cable of claim 2 , wherein the at least one strength element comprises a first elongate strength element on a first side of the armor and a second elongate strength element on a second side of the armor.
10. The cable of claim 2 , wherein the filler material contacts the armor.