Wire Rope Direct News

PLASTIC IMPREGNATED ROPE (PIR)

Plastic Impregnated Rope

Plastic impregnated rope or PIR, is often used on mobile cranes, coal and ore un-loaders and some piling operations, or other severe applications where rope is exposed to high levels of dust, dirt or other corrosive materials as well as high levels of wear. The plastic acts as a shield to the strands.

Unlike normal wire rope, plastic impregnated rope does not stretch, this is because all of the voids between the steel wire rope strands are filled with a sealing thermoplastic, forming not only a protective layer with a cushioning effect but also a sticking quality, sticking the wires together, which is particularly useful in rotating ropes as they can often begin to twist apart, PIR prevents this. This process prevents the internal wires from rubbing together and therefore nearly eliminating internal wear, and thus less maintenance.

Some PIR is completely covered in the plastic, but this makes inspection difficult, it is also less flexible than normal wire rope and so unsuitable for some applications, like large tower cranes.

Plastic impregnated rope reduces contact bending stresses and therefore improving load transfer , PIR is also much more resilient to shock loading.

Contact of normal wire rope with winding drums and sheaves leads to high pressure point contact, where the individual wires meet the contour of the groove, with completely covered plastic impregnated rope this is greatly reduced because it has a full cross section, so a full circle path is presented to the parts which cause the wear, and thus greatly reducing wear on the PIR.

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