Diagnosing High Yarn Hairiness
topic
High hairiness diagnosis: (1) Identify whether H or S3 is elevated: S3 elevation indicates long fibre protrusion (spinning triangle issue); H elevation indicates overall short fibre population. (2) Check traveller condition and profile — worn travellers increase both H and S3. (3) Check spindle speed — excessive speed widens spinning triangle. (4) Check ring condition — rough or scored ring increases traveller vibration and fibre abrasion. (5) Check front roller cot roughness — worn cots mechanically damage fibres. (6) Check compacting suction if compact spinning.
Role
Hairiness diagnosis is critical for mills supplying the knitting and fine shirting markets where hairiness specifications are contractual. An unexplained hairiness increase on a customer lot — if not caught before shipment — causes fabric pilling complaints that result in full lot rejection at the customer's dyehouse, with claims typically 5–10× the value of the yarn. Early hairiness diagnosis and correction prevents these costly downstream failures.