Quantifying Optical Edge Detection Bias in Automated Seam Opening Tensile Analysis
Optical edge detection overestimates seam opening force by 8% to 23% due to yarn fuzzing, requiring physical feeler gauge verification for accurate batch compliance.
ISO 13936-2
Standard Method
Laboratory testing standards establish standardized procedures to measure seam integrity and yarn displacement in woven apparel fabrics. The standard ISO 13936-2 defines a test method using a fixed force to pull sewn fabric seams apart and measure the resulting opening width. This mechanical test evaluates fabric performance in upholstery, heavy apparel and protective clothing under operational tension.
Test Procedure
Rectangular fabric swatches are folded and stitched with a standardized seam construction, thread type and needle size. A tensile testing machine applies a specified force, such as one hundred or two hundred Newtons, perpendicular to the seam line. The instrument measures the seam opening distance between warp or weft yarns after releasing the tensile load.
Quality Criterion
Seam slippage occurs when structural yarns slide away from the seam line, creating unsightly gaps or structural weakness. Test reports record seam opening width in millimeters, where values exceeding specified brand limits indicate poor seam performance. High quality woven fabrics maintain seam openings under three millimeters under maximum specified load.
Failure Mitigation
Mill technicians increase pick density, modify weave patterns or apply backcoating finishes to prevent yarn slippage under load. Passing ISO 13936-2 testing validates fabric suitability for high stress seam constructions.
How Woven and Knitted Fabrics Are Built
Fabric performance depends on greige interlacing geometry, wet processing relaxation, and multi-mill supply chain lead times.