Yarn Displacement
Fabric irregularities occur when parallel threads shift from their original woven positions under low mechanical stress. This occurrence, known as a slippage defect, typically appears as a localized opening or gap in the weave structure where yarns have bunched together. Low thread count or smooth fiber surfaces are primary factors that contribute to this structural instability.
Warp Interaction
High-speed loom operations must maintain correct tension levels to ensure that warp and weft yarns lock securely at each intersection. Inadequate crimp or excessive yarn smoothness prevents the necessary interlocking, causing the threads to slide easily when the fabric is handled. This movement is particularly problematic in lightweight linen fabrics where the loose weave offers less resistance to displacement.
The defect is often exacerbated by improper washing or finishing treatments that remove the protective starches before the fabric is sewn into finished garments.
Quality Test
Laboratory assessments employ standard load tests to evaluate the resistance of the fabric to thread displacement along the seams. Specifying the minimum force required to cause a predetermined shift determines the suitability of the material for garment manufacturing. If the fabric fails this threshold, it is graded as substandard and diverted from premium export lots.
