Greige Thread Density Influence on Wet Fabric Relaxation
Greige thread density limits wet fabric relaxation by establishing inter-yarn friction boundaries that block yarn swelling and crimp interchange during finishing.
Off Loom Elastic Recovery
Stretch Recovery
Dimensional spring-back phenomena describe fabric length contraction occurring immediately after tension release on the weaving machine take-up motion. Textile testing laboratories evaluate off loom elastic recovery to determine structural width contraction and yarn relaxation in stretch fabrics containing elastomeric threads. This measurement ceases to apply to rigid non-stretch fabrics constructed entirely from high-modulus static yarns.
Retraction Rate
Tensile stress relaxation causes elastomeric core yarns to contract, drawing adjacent warp and weft threads closer together. Fabric width contracts while linear mass density increases rapidly upon leaving the loom reed. Mill engineers measure off loom elastic recovery by marking reference lengths under weaving tension and remeasuring dimensions after off-loom relaxation.
Immediate elastic rebound accounts for most structural contraction, followed by slow viscoelastic creep recovery.
Relaxation Period
Off-loom relaxation requires full atmospheric conditioning to achieve dimensional equilibrium before downstream finishing. Internal residual stresses dissipate over twenty-four hours of unconstrained resting on flat storage tables.
Mill Calibration
Weaving reed width specifications must account for off-loom width loss to deliver target greige fabric width to wet processing units. Miscalculating contraction rates leads to off-spec finished fabric widths and incorrect square meter weight. Technicians utilize off loom elastic recovery data to adjust warp tension controls and temple settings on high-speed looms.
Proper tension management prevents edge distortion and puckering during grey inspection.