Bend fatigue resistant blended rope
AssigneeHampidjan hf
InventorHjortur Erlendsson
Life of this patent
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Abstract
Disclosed is a blended rope having an outer sheath (8) enclosing at least a strength member (7), the strength member (7) having high-strength synthetic fibers, the strength member (7) being a blended strength member (7) formed with a combination of ARAMID fibers and HMPE fibers, the blended strength member comprising a non-homogeneous distribution of the ARAMID and HMPE fibers, wherein the weight ratio of ARAMID to HMPE in the strength member (7) is preferably a minimum of 80:20.
Claims19
A blended rope, the rope having an exterior sheath (8) enclosing at least a strength member (7), the strength member (7) having high-strength synthetic fibers, the strength member (7) being a blended strength member (7) formed with a combination of ARAMID fibers and HMPE fibers, the blended strength member comprising a non-heterogenous distribution of the ARAMID and HMPE fibers, the strength member further comprising main rope strands (17) each are formed with a primary strand sheath (21) that:
- (a) mainly is formed from HMPE filaments;
- and (b) encloses a core (19) mainly formed from ARAMID filaments.
A process for producing a rope having a blended strength member, the process having at least steps of:
- providing a care (3) formed of thermoplastic;
- forming a flow-shield sheath (5) around the thermoplastic core (3);
- forming several main rope strands (17) where each main rope strand (17) comprises ARAM ID fibers and a material comprising HMPE;
- loading a braiding machine capable of forming hollow braided sheaths with several of the main rope strands (17), and using the loaded braiding machine to form a braided strength member (7) around the combination of at least the thermoplastic core (3) and the flow-shield sheath (5);
- next:
- while maintaining tension sufficiently to preserve a desired amount of elongation and compaction of the strength member, cooling the strength member and all it contains until the thermo-plastic core achieves a solid phase,
- the process characterized by that fact that the step of forming the several main rope strands (17) where each strand comprises ARAMID fibers and a material comprising HMPE further comprises a step of selecting a non-heterogenous distribution of the ARAMID fibers and the material comprising HMPE.
Dependencies are inferred from the claim text.