Cotton Fiber Length Distribution Metrics and Carded Yarn Quality
AFIS short fiber content by weight in raw cotton must remain below 8.5 percent to prevent severe mass variance and tenacity drop in carded yarn spinning.
Yarn Thin Places
Strand Narrowing
A textile yarn defect consisting of a localized reduction in mass that falls below a pre-set percentage of the average yarn cross-section indicates a critical weak point in the yarn. Quality control departments measure yarn thin places to predict where yarn breaks are most likely to occur during high-tension downstream processes. This evaluation excludes yarn twist measurements.
Structural Causes
These defects are caused by poor fiber control during the drafting stage or by the presence of short fibers. Because there are fewer fibers in these narrow regions, yarn thin places possess much lower strength than the rest of the yarn. This makes them highly susceptible to breaking.
Industrial Consequences
During the high-speed weaving process, the intense warp tension will easily rupture these weak regions, causing loom stoppages that degrade fabric quality. When mills monitor yarn thin places, they focus on reducing the frequency of these defects to maintain high weaving efficiency. Modern winding machines use electronic yarn clearers to detect and remove these thin regions before the yarn is wound onto cones.
This preventive step ensures a higher quality product for the weaver. Clean yarns result in more durable fabrics.
Commercial Specifications
Weaving and knitting mills establish strict upper limits for thin places in their yarn purchase specifications. Yarns that fail to meet these limits are prone to causing fabric holes during knitting. This strict requirement ensures trouble-free garment production.