Rope containing high-performance polyethylene fibres
The invention relates to a rope containing a plurality of strands comprising a mixture of high-performance polyethylene fibres and polytetrafluoroethylene fibres in a mass ratio of 70:30 to 98:2. The rope shows markedly improved service life performance in cyclic bend-over-sheave applications. The invention also relates to the use of said rope as a load-bearing member in bend-over-sheave applications.
1. Rope containing a plurality of rope strands comprising a mixture of high-performance polyethylene (HPPE) fibres and polytetrafluoroethylene (PTFE) fibres, and at least one core strand in a core of the rope which consists of HPPE fibres and optionally fibers other than PTFE fibres, wherein the HPPE and PTFE fibres are present in the rope in a total mass ratio of HPPE to PTFE of 70:30 to 98:2.
2. Rope according to claim 1 , wherein the rope is of a braided construction.
3. Rope according to claim 1 , wherein the rope contains 8 or 12 strands.
4. Rope according to claim 1 , wherein the rope has a diameter of at least 30 mm.
5. Rope according to claim 1 , wherein the high-performance polyethylene fibres have a tenacity of at least 2.5 N/tex.
6. Rope according to claim 1 , wherein the polytetrafluoroethylene fibres have a tenacity of at least 0.3 N/tex.
7. Rope according to claim 1 , wherein the mass ratio of HPPE fibres to PTFE fibres is from 80:20 to 95:5.
8. Rope according to claim 1 , wherein the rope further contains from about 2 to 20 mass % of silicone compounds.
9. Rope according to claim 1 , wherein the rope exhibits a flex fatigue which is improved by at least a factor of 5 compared to the rope not comprising the PTFE fibres.
10. A load-bearing member for bend-over-sheave applications which comprises a rope according to claim 1 .