What is Twisting? When one end of a spun filament is held stationary while the other end rotates, forming a yarn—this process is called twisting. Why is Twisting Important? Twisting significantly impacts the physical/mechanical properties and appearance of yarns, directly influencing fabric characteristics, aesthetics, and usability. For staple fiber yarns, twisting imparts strength and other essential traits; for filament yarns and ply yarns, it stabilizes their structure against external forces. Classification of Twisting There are two primary types of twisting: True Twist and False Twist. �� True TwistTrue twist involves applying twist to a sliver, causing outer fibers to form inclined helical loops (twist contractions). This deforms fibers, tightly binds the yarn structure, and alters the collective morphology and mechanical properties of the fiber assembly. Key metrics include twist level, angle of twist, pitch of twist, twist factor, direction of twist, and percentage shrinkage due to twist. �� False TwistFalse twist operates by clamping both ends of a multifilament bundle and inserting a twisting device midway. The resulting twist directions at either side of the device are opposite yet equal in magnitude, yielding a net zero twist across the entire yarn. Simply put: One section receives unidirectional twist, while the other experiences counter-directional twist of identical intensity—effectively cancelling out (total twist sum = 0). Functions of True Twist vs. False Twist ✅ True Twist Effects: · Produces yarns with higher strength and durability. · Offers greater production stability and efficiency. · Minimizes fiber loss during spinning. ✅ False Twist Effects: · Imparts localized twist to prevent unintended drafting and reduce breaks. · Used on synthetic filaments to create texturized/bulked yarns (e.g., stretch yarns). · Enhances fiber strength, longevity, uniformity, and softness. By understanding these principles, we gain deeper insight into textile twisting technologies, enabling optimized production methods to improve product quality and performance.