Quantifying Loom Downtime Cost Recovery from Friction Defect Induced Warp Breaks
Excess warp breaks from friction defects add unabsorbed loom downtime costs recoverable through measured stop logging and laboratory coefficient of friction proof.
Yarn Hairiness S3
Fibre Protrusion
Quantitative quality metric tracks the total number of protruding fibres longer than three millimetres on the surface of a yarn. In the evaluation of flax spinning, yarn hairiness s3 provides a specific count that correlates with the tendency of the fabric to pill or feel rough to the touch. This value is a primary component of the overall hairiness index used in international trade.
Spinning Geometry
Fibres that are not fully incorporated into the twisted core of the yarn extend outward from the surface. The distance of three millimetres is used as a threshold because shorter fibres contribute to the feel of the yarn while longer ones interfere with the weaving process. High speeds in the ring spinning frame can increase this count if the traveller or the ring is worn out.
Linen yarns are naturally more prone to hairiness than cotton due to the stiffness and variable length of the flax fibres. Mills control this factor by adjusting the spindle speed or using specialized compact spinning attachments. If the count is too high, the yarns will catch on each other during the shed opening on the loom and cause weaving stops.
Singeing or sizing processes are often employed to lay these protruding fibres flat before the yarn reaches the weaving department.
Fabric Appearance
Final cloth surface quality is determined by the number of these long protruding ends. Fabrics made from yarn with a low value for this metric show a cleaner weave pattern and a smoother finish. Monitoring this count during the spinning phase prevents the production of sub-standard lots that would fail visual inspection after dyeing.