Two Methods of Measurement of Yarn Hairiness are as follow:
Uster Tester 3- H
The principle of measuring is based on evaluation with the help of diffracted light. The hairiness value H is defined as the total length of all the fibre ends that stick out in cm, related to a yarn section which is of 1cm length.
Hairiness is counted on both the sides of the yarn’s silhouette. Therefore, the tested values have high reliability factor.
Since the device uses an infrared laser, influences by light absorption cannot be excluded.
Hairiness Tester G 566
This device applies the Photoelectric Principle to determine yarn hairiness. Fibres that stick out are sensed by Diodes as shadows.
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