Fabric Displacement
Structural failures in woven garments occur when the yarns parallel to a seam pull away from the sewing thread under stress. The seam slippage represents a major defect where warp or weft yarns slide across each other, leaving a visible gap along the seam line. This issue is common in linen fabrics with loose weaves or smooth, low-friction yarn surfaces.
Testing Procedure
Standard laboratory tests use a tensile tester to apply a specific force to a stitched fabric sample and measure the width of the resulting gap. The specimen is prepared with a standard seam and pulled in a direction perpendicular to the stitch line. This procedure is repeated for both warp-over-weft and weft-over-warp directions to identify the weakest yarn configuration.
The force required to create a specific gap size is recorded, providing a clear metric for comparing different fabric constructions.
Garment Failure
Weaving mills can reduce this problem by increasing the pick density or by applying specialized finishing agents that increase yarn-to-yarn friction. Buyers of linen clothing often specify a maximum allowed slippage width under a set force, such as six millimeters at eighty Newtons. This quality threshold prevents garments from splitting during normal wear and laundering.
