Twist Level Measurement and Process Control
topic
Yarn twist level measurement uses the untwist-retwist method per ISO 2061 where a defined length of yarn is untwisted and then re-twisted to the original diameter to count the twist revolutions per unit length, with automatic twist testing equipment providing rapid testing of multiple samples and statistical analysis of twist variation within packages and between packages that characterises process consistency and uniformity.
Role
Verifies that twist insertion in twisting and cabling operations meets the yarn specification for twist per metre that determines the mechanical and processing properties of the twisted yarn, with twist level measurement being the primary quality control test for twisting operations and twist variation being a key quality parameter whose consistency governs the uniformity of fabric appearance from twisting-related shade variation in dyed fabrics.