Yarn Hairiness | Hariness of Yarn | Uster Hairiness Index | Zweigle Hairiness Index

Yarn Hairiness
Hairiness is a measure of the amount of fibers protruding from the structure of the yarn. In the past, hairiness was not considered so important. But with the advent of high-speed looms and knitting machines, the hairiness has become a very important parameter.
Hairiness of yarn
In general, yarn spun with Indian cotton show high level of hairiness due to the following reasons.
  • High short fiber content in mixing.
  • Low uniformity ratio.
  • High spindle speeds.
Hence most of the Indian yarns have a hairiness index above 50% Uster standards.

Hairiness is measured in two different methods.
  1. Uster Hairiness Index
  2. Zweigle Hairiness Index
Uster Hairiness Index
This is the common method followed in India. The hairiness index H corresponds to the total length of protruding fibres within the measurement field of 1cm length of the yarn.
Zweigle Hairiness Index
This zweigle hairiness measurement (S3) gives the number of protruding fibers more than 3 mm in length in a measurement length of one meter of the yarn.

From the above you can infer that Uster hairiness index give the total length of hairs whereas zweigle hairiness testers give the absolute number of fibers. Though the later measurement is more accurate, most of the Indian spinners are still following Uster hairiness index only.


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