Edge Tension
Deviation in the yarn take-up between the selvedge threads and the main body of the fabric after the weaving process is complete affects the finished flatness of the cloth. Selvedge crimp variance occurs when the tension applied to the outermost warp ends during weaving does not match the tension of the internal ends. This imbalance results in wavy or tight edges that disrupt subsequent processing.
Structural Impact
Varying weave patterns in the selvedge often require separate tensioning systems or dedicated bobbins. If the selvedge crimp variance is too high, the edges will react differently than the rest of the fabric during dyeing and finishing. A common result is the curling or bowing of the fabric during stenter processing.
Manufacturing Difficulty
Garment factories struggle with fabrics that exhibit high levels of edge distortion because the material will not lay flat on the cutting table. This issue leads to inaccurate pattern cutting and sewing difficulties, particularly in long seams. Maintaining a low selvedge crimp variance is therefore a primary requirement for high quality weaving mills.
Measurement Method
Technicians quantify this property by comparing the take-up of edge yarns against center yarns. This comparison reveals the extent of the variance.
