Three types of continuous twist irregularity testers were constructed which measure the variability of twist along a specified length of yarn utilizing a continuous untwist- twist principle. These testers can also be used to detect periodicities.
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References
1.
ASTM Committee D-13, ASTM Standards on Textile Materials (D 76-53, ¶ 15; D 180-54 T, ¶ 9; and D 1380-56 T, ¶ 67).
