Measurement of Hairiness
• Measurements
of hairiness are very dependent on the experimental configuration used such as
the number and type of guides the yarn passes over and also the method chosen
for detecting the hairs.
• In
general hairiness of yarn is measured by
• Shirley
Hairiness Tester
• Zweigle
Hairiness Tester G565
• Uster
Tester 3
Shirley Yarn Hairiness Tester process are given below.
Shirley Yarn Hairiness Tester
• Shirley
yarn hairiness tester consists of a light beam shining on a small diameter
photoreceptor opposite to it.
• The
yarn under test is run between the light and the receptor at a constant speed.
• As
a hair posses between the light and receptor the light beam is momentarily
broken and an electronic circuit counts the interruption as one hair.
• It
counts the number of hairs longer than a pre-selected length (between 0 and 10
mm), usually 3 mm
 |
| shirley process |
• The
instrument has two sets of yarn guides as shown. The lower set leads the yarn
over a guide at a fixed distance of 3mm from the receptor.
• The
upper set leads the yarn over a movable guide which can be set at a distance of
between 1 and 10mm from the receptor.
* The total number of hairs in a fixed length of
yarn is counted by counting for a given time, the yarn running at a known
speed.
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