What Is HVI Cotton Analysis and Why Does It Matter to Spinners?
Anariss technical team
4 min read
What is HVI?
HVI stands for High Volume Instrument, a system that measures the key physical properties of cotton fibre in a matter of minutes. Unlike visual and hand classing, which depends on the grader's experience, HVI results are numerical, repeatable and comparable. That is why most cotton markets today trade on the HVI report for each bale or shipment.
Fibre length, uniformity and strength
Fibre length (UHML) determines which yarn counts a cotton is suited to; longer fibre allows finer, more even yarn. The uniformity index shows how close the fibre lengths in a sample are, and the higher it is, the less waste and hairiness on the spinning line. Fibre strength, reported in grams per tex, has a direct effect on yarn strength and on end breaks during spinning.
Micronaire, short fibre, trash and moisture
Micronaire reflects a combination of fibre fineness and maturity, and values that are either too low or too high cause problems with dyeing and yarn quality. Short fibre content affects combing waste and yarn evenness. Trash and moisture levels influence not only quality but also the true weight of a shipment and the cost of cleaning at the mill.
How the HVI report supports confident buying
When a mill's technical requirements are defined from the start in terms of HVI indicators, buyer and seller share a common language for quality and disputes after delivery are kept to a minimum. Anariss assesses cotton shipments against these indicators before supply, so that each mill receives cotton matched to its own production line.
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