Cable strength member

• US 20040096168A1
• Filed: 11/18/2002
• Published: 05/20/2004
• Est. Priority Date: 11/18/2002
• Status: Active Grant

• Current Assignee: NEPTCO, Inc. (Chase Corporation)
• Original Assignee: NEPTCO, Inc. (Chase Corporation)
• Inventors: Wells, Leslie Harrell
• Granted Patent: US 6,901,192 B2
• Time in Patent Office: Days
• US Class Current: 385/113
• CPC Class Codes: G02B 6/4416 Heterogeneous cables
• CPC Class Codes: G02B 6/4432 with fibre reinforcements

Abstract

A nonmetallic, nonconductive strength member for use in a cable or as a component of a strength reinforcement system of a cable is provided. The strength member is constructed of low cost materials and includes multiple glass fibers coated with a coating composition. The strength member provides flexibility and high tensile strength. The strength member exhibits low smoke generation and low flammability properties. The coating composition includes at least a lubricant that imparts a substantially smooth surface and a low coefficient of friction to the glass fibers to help facilitate processing of the strength member(s) during cabling and stranding procedures. The coating composition also includes at least an adhesive component that helps to substantially adhere the glass fibers together and helps to form the glass fibers into the strength member. The strength member can be configured as a yarn or as a strand for incorporation within a cable and/or for arrangement with one or more cable components.

Claims

1. A strength member for use with a cable, the strength member comprising:

a yarn including a plurality of elongated glass fibers arranged substantially parallel to one another along a central axis of the yarn,

each glass fiber being substantially coated with a coating, the coating including at least a first component that forms a substantially smooth coat on each glass fiber and at least a second component that renders each glass fiber flexible to form the plurality of glass fibers into the yarn,

wherein the coating is present at a percentage by weight of less than about 5 percent.

2. The strength member of claim 1 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 95 percent, and the coating is present at a percentage by weight of less than about 5 percent.

3. The strength member of claim 1 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 98 percent.

4. The strength member of claim 1 wherein the coating is present at a percentage by weight of less than about 2 percent.

5. The strength member of claim 1 wherein the yarn generates substantially minimal smoke when in contact with a continuous flame.

6. The strength member of claim 1 wherein the yarn does not ignite when in contact with a continuous flame in an atmosphere in which oxygen is present in a concentration of less than about 40 percent.

7. The strength member of claim 1 wherein the yarn includes a tensile strength of from about 50 to about 1,150 Newtons.

8. The strength member of claim 1 wherein the yarn includes a minimum tensile strength of greater than about 50 Newtons.

9. The strength member of claim 2 wherein the yarn generates substantially minimal smoke when in contact with a continuous flame, and does not ignite when in contact with a continuous flame in an atmosphere in which oxygen is present in a concentration of less than about 40 percent.

10. The strength member of claim 9 wherein the yarn includes a tensile strength of from about 50 to about 1,150 Newtons.

11. The strength member of claim 1 wherein the first component is selected from the group consisting of a resin, an adhesive, an acrylic, an acrylic resin, an acrylic emulsion, polyurethane, styrene butadiene rubber, latex, and any combination thereof.

12. The strength member of claim 1 wherein the first component includes RHOPLEX®

E-358.

13. The strength member of claim 1 wherein the first component is present at a concentration of from about 10 to about 90 percent by weight.

14. The strength member of claim 1 wherein the first component is present at a concentration of from about 60 to about 85 percent by weight.

15. The strength member of claim 1 wherein the second component is selected from the group consisting of a lubricant, a wax, silicone, a textile finish, a starch-based sizing, an acrylic, an acrylic emulsion, polyacrylamide, and any combination thereof.

16. The strength member of claim 1 wherein the second component includes MARSOFT™

NPE-20.

17. The strength member of claim 1 wherein the second component is present at a concentration of from about 10 to about 90 percent by weight.

18. The strength member of claim 1 wherein the second component is present at a concentration of from about 10 to about 30 percent by weight.

19. The strength member of claim 1 wherein the first component is present at a concentration of about 75 to about 95 percent by weight, and the second component is present at a concentration of about 15 to about 40 percent by weight.

20. The strength member of claim 1 wherein the plurality of glass fibers is selected from the group consisting of E-glass fibers, ECR-glass fibers, S-glass fibers, continuous glass fibers, and any combination thereof.

21. The strength member of claim 1 wherein the strength member includes a denier of from about 2,500 and to about 22,000.

22. A strength reinforcement system for use with a cable, the system comprising:

a plurality of strength members, each strength member including;

a yarn constructed of a plurality of elongated glass fibers arranged substantially parallel to one another along a central axis of the yarn,

each glass fiber being substantially coated with a coating, the coating including at least a first component that forms a substantially smooth coat on each glass fiber and at least a second component that renders each glass fiber flexible to form the plurality of glass fibers into the yarn, wherein the coating is present at a percentage by weight of less than about 5 percent.

23. The system of claim 22 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 95 percent, and the coating is present at a percentage by weight of less than about 5 percent.

24. The system of claim 22 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 98 percent.

25. The system of claim 22 wherein the coating is present at a percentage by weight of less than about 2 percent.

26. The system of claim 22 wherein the yarn generates substantially minimal smoke when in contact with a continuous flame.

27. The system of claim 22 wherein the yarn does not ignite when in contact with a continuous flame in an atmosphere in which oxygen is present in a concentration of less than about 40 percent.

28. The system of claim 22 wherein the yarn includes a tensile strength of from about 50 to about 1,150 Newtons.

29. The system of claim 22 wherein the yarn includes a minimum tensile strength of greater than about 50 Newtons.

30. The system of claim 23 wherein the yarn generates substantially minimal smoke when in contact with a continuous flame, and does not ignite when in contact with a continuous flame in an atmosphere in which oxygen is present in a concentration of less than about 40 percent.

31. The system of claim 23 wherein the yarn includes a tensile strength of from about 50 to about 1,150 Newtons.

32. The system of claim 23 wherein the yarn includes a minimum tensile strength of greater than about 50 Newtons.

33. The system of claim 23 wherein the first component is selected from the group consisting of a resin, an adhesive, an acrylic, an acrylic resin, an acrylic emulsion, polyurethane, styrene butadiene rubber, latex, and any combination thereof.

34. The system of claim 22 wherein the first component includes RHOPLEX®

E-358.

35. The system of claim 22 wherein the first component is present at a concentration of from about 10 to about 90 percent by weight.

36. The system of claim 22 wherein the first component is present at a concentration of from about 60 to about 85 percent by weight.

37. The system of claim 22 wherein the second component is selected from the group consisting of a lubricant, a wax, silicone, a textile finish, a starch-based sizing, an acrylic, an acrylic emulsion, polyacrylamide, and any combination thereof.

38. The system of claim 22 wherein the second component includes MARSOFT™

NPE-20.

39. The system of claim 22 wherein the second component is present at a concentration of from about 10 to about 90 percent by weight.

40. The system of claim 22 wherein the second component is present at a concentration of from about 10 to about 30 percent by weight.

41. The system of claim 22 wherein the first component is present at a concentration of from about 75 to about 95 percent by weight and the second component is present at a concentration of from about 15 to about 40 percent by weight.

42. The system of claim 22 wherein the plurality of glass fibers is selected from the group consisting of E-glass fibers, ECR-glass fibers, S-glass fibers, continuous glass fibers, and any combination thereof.

43. The system of claim 22 wherein the strength member includes a denier of from about 2,500 and to about 22,000.

44. The system of claim 22 wherein the strength member includes a denier of from about 3,500 to about 4,000.

45. A method for making an elongated strength member for use in a cable, the method comprising:

providing a plurality of elongated glass fibers;

providing a coating including at least a first component that forms a substantially smooth coat on each glass fiber and at least a second component that renders each glass fiber flexible to form the plurality of glass fibers into the yarn;

coating the plurality of glass fibers with the coating to substantially coat each glass fiber;

arranging the plurality of glass fibers substantially parallel to one another;

forming the plurality of glass fibers into an elongated yarn; and

drying the coating, wherein the coating is present at a percentage by weight of less than about 5 percent.

46. The method of claim 45 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 95 percent, and the coating is present at a percentage by weight of less than about 5 percent.

47. The method of claim 45 wherein providing a plurality of elongated glass fibers includes providing a plurality of elongated glass fibers selected from the group consisting of E-glass fibers, ECR-glass fibers, S-glass fibers, continuous glass fibers, and any combination thereof.

48. The method of claim 45 wherein the first component is selected from the group consisting of a resin, an adhesive, an acrylic, an acrylic resin, an acrylic emulsion, polyurethane, styrene butadiene rubber, latex, and any combination thereof

49. The method of claim 45 wherein the first component includes RHOPLEX®

E-358.

50. The method of claim 45 wherein the first component is present at a concentration of from about 60 to about 85 percent by weight.

51. The method of claim 45 wherein the second component is selected from the group consisting of a lubricant, a wax, silicone, a textile finish, a starch-based sizing, an acrylic, an acrylic emulsion, polyacrylamide, and any combination thereof.

52. The method of claim 45 wherein the second component is present at a concentration of from about 10 to about 30 percent by weight.

53. The method of claim 45 wherein the first component is present at a concentration of from about 10 to about 90 percent by weight and the second component is present at a concentration of from about 10 to about 90 percent by weight.

54. The method of claim 45 wherein the yarn generates substantially minimal smoke when in contact with a continuous flame, and does not ignite when in contact with a continuous flame in an atmosphere in which oxygen is present in a concentration of less than about 40 percent.

55. The method of claim 45 wherein the yarn includes a tensile strength of from about 50 to about 1,150 Newtons.

56. The method of claim 45 wherein drying the coating includes applying heat to the plurality of glass fibers when coated.

57. A cable comprising:

a cable jacket, the cable jacket defining an interior having elongated generally circular cylindrical shape;

a core disposed within the cable jacket interior to extend longitudinally along a center axis of the cable jacket;

one or more conductors disposed within the cable jacket interior and arranged around the core such that the one or more conductors extend longitudinally along the center axis of the cable jacket; and

one or more strength members disposed within the cable jacket interior extending longitudinally along the center axis of the cable jacket, wherein each of the one or more strength members includes;

a plurality of elongated glass fibers arranged substantially parallel to one another along a central axis of the yarn,

each glass fiber being substantially coated with a coating, the coating including at least a first component that forms a substantially smooth coat on each glass fiber and at least a second component that renders each glass fiber flexible to form the plurality of glass fibers into the yarn, wherein the coating is present at a percentage by weight of less than about 5 percent.

58. The cable of claim 57 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 95 percent, and the coating is present at a percentage by weight of less than about 5 percent.

59. The cable of claim 57 wherein each of the one or more strength members is disposed and arranged adjacent to the one or more conductors and around the cable core.

60. A cable comprising:

a cable jacket, the cable jacket defining an interior having an elongated generally circular cylindrical shape;

one or more conductors disposed within the cable jacket interior such that the one or more conductors extend along longitudinally along a center axis of the cable jacket; and

one or more strength members disposed and arranged among the one or more conductors such that the one or more strength members extend longitudinally along the center axis of the cable jacket, wherein each of the one or more strength members includes;

a plurality of elongated glass fibers arranged substantially parallel to one another along a central axis of the yarn,

each glass fiber being substantially coated with a coating, the coating including at least a first component that forms a substantially smooth coat on each glass fiber and at least a second component that renders each glass fiber flexible to form the plurality of glass fibers into the yarn, wherein the coating is present at a percentage by weight of less than about 5 percent.

61. The cable of claim 60 wherein the plurality of glass fibers is present at a percentage by weight of greater than about 95 percent, and the coating is present at a percentage by weight of less than about 5 percent.