Monday, May 14, 2012
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| Hairiness of yarn |
In general, yarn spun with Indian cotton show high level of hairiness due to the following reasons.
Hence most of the Indian yarns have a hairiness index above 50% Uster standards.
- 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.
- Uster Hairiness Index
- 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.
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.
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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