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ROPE

"A rope is a group of plies, yarns or strands which are twisted or braided together in order to combine them into a larger and stronger form. Ropes have tensile strength and so can be used for dragging and lifting, but are too flexible to provide compressive strength. As a result, they cannot be used for pushing or similar compressive applications. Rope is thicker and stronger than similarly constructed cord, line, string, and twine. Ropes made from metal strands are called wire rope."

Styles of rope construction:

  • Laid or twisted rope: normally three strainds and twisted to the right, the Z-twist rop is a right-handed twist, S-twist is a left-handed twist,fibres are gathered and spun into yarns, yarns are twisted into strands, the twist of the yarn is opposite to the twist of the strand and then opposite to the twist of the rope
  • Braided rope:made from a flat braid of odd number of strands, usually made from high performance¬†fibres (nylon, polyester, polyethylene, HMPE, aramid);¬†Single braid: even number of strands (typically 8 or 12), strands interlock in a twill or plain weave, can have a large or small hollow middle; Double braid: has an inner braid filling with an outer braid, may be different or same material, often outer braid is more resistant and inner braid is stronger; Solid braid: all strands travel in the same direction, strand alternate with being the inner and outer rope, popular for general purpose rope

© Lauren Holly Best, all rights reserved