Identifying Primary Warp Yarn Weakness Mechanisms in Air Jet Weaving
Warp yarn failure on air-jet looms stems from pneumatic twist disruption and drop-wire abrasion, requiring high-speed tensile screening to protect shed hours.
Hairiness S3 Index
Quality Parameter
Optical testing systems calculate the cumulative number of fibers extending three millimeters or more from the main body of a yarn. This measurement defines the hairiness s3 index for apparel and home textile yarns. It indicates the potential for pilling and the friction of the yarn during high-speed knitting or weaving.
Testing Procedure
An infrared sensor monitors the yarn as it travels at high speed through the measurement zone of the tester. The sensor registers the protruding fibers and classifies them into different length categories to extract the hairiness s3 index. Because linen yarn is naturally hairy due to the stiff flax fibers, this index must be monitored to prevent excessive friction.
Technicians use this data to set yarn-singeing parameters or to adjust warp sizing compositions.
Processing Consequence
Excessive long fibers on the yarn surface cause clinging and shedding in the loom during the weaving process. If the hairiness s3 index is too high, the adjacent warp yarns entangle, which stops the weaving machine and damages the fabric. Controlling this factor is particularly important for the fine linen fabrics used in summer shirts where a smooth feel is essential.
The mill adjusts the spinning draft, the traveler weight on the ring frame, or the winding speed to keep this metric within the customer’s limits. Regular measurements on every spinning lot ensure that the fabric has the desired finish and durability.