Angular Shift
Geometric yarn misalignment where the filling threads in a woven fabric are not perpendicular to the warp threads. Measuring the weft skew angle is a required step in quality control to prevent the twisting of garments during use. The measurement stops at the point where the fabric is held under tension during the stentering process.
Finishing Correction
Internal stresses in the fabric can cause the horizontal yarns to slant in one direction. If the weft skew angle is too high, the fabric will appear distorted and patterns like checks or stripes will not align. Mills use an optical sensor to detect these deviations in real time.
Quality Tolerance
Correcting the bias involves the use of a weft straightener that applies uneven tension across the width of the material. Specialized rollers pull the lagging side of the fabric forward until the yarns are squared.
Visual Distortion
Commercial standards usually permit a small degree of tilt depending on the weight and construction of the textile. Excessive weft skew angle leads to garments that rotate on the body of the wearer, making them unsellable. Inspections are performed on a flat table where the fabric is allowed to relax naturally.
Accurate measurement ensures that the final product meets the dimensional requirements of the buyer.
