Predictive Geometrical Modeling of Crimp Interchange and Width Collapse during Wet Finishing
Geometrical modeling of crimp interchange predicts width collapse during wet finishing by balancing yarn swelling against mechanical jamming boundaries.
Bending Rigidity
Stiffness Metric
A physical property of textile structures quantifies the couple required to bend a fabric strip through a unit curvature per unit width. The bending rigidity determines how a fabric resists flexural deformation during garment assembly and wear. Laboratory measurement utilizes cantilever bending testers or heart-loop meters to record flexural rigidity values in both warp and weft directions.
High values denote stiff, structured fabrics suitable for tailored outerwear, whereas low values indicate limp fabrics desired for fluid draping.
Flexural Calculation
Mathematical determination of flexural stiffness combines fabric mass per unit area with the third power of bending length. Calculating bending rigidity requires precise specimen cutting to eliminate edge fraying that corrupts length measurements. Thread density and yarn linear density directly increase resistance to flexure, while float length in weave structures reduces resistance by allowing yarn mobility.
Higher yarn twist locks fibres together, increasing individual thread stiffness and fabric resistance to bending.
Drape Behavior
Fabric drape in finished garments correlates directly with resistance to bending across multiple axes. High resistance prevents smooth folding over garment forms, leading to rigid silhouettes and harsh fabric hand. Low resistance allows fabric to yield under gravitational force, forming soft ripples and dense drape folds.
Finishing Influence
Chemical finishes and mechanical softening treatments lower flexural resistance by reducing inter-yarn friction.