SOME FABRIC PROPERTIES AND THEIR RELATION TO CREASE-PROOFING EFFECTS

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Abstract
The crease-recovery of a fabric depends not only on the mechanical properties of its component fibres but also on properties related to the structure of the fabric itself. Some of these fabric properties can be changed by the application of polymeric materials which are deposited within the fabric on the surface of the fibres and modify the structure of the fabric by bonding fibres and/or yarns together. The extent to which the fabric behaviour is modified depends also on the properties of the applied polymer. The nature of the structural changes produced by some aminoplast and acrylate polymers has been investigated by studying stiffness, yarn-to-yarn adhesion at cross-overs, yarn-removal load, air-permeability, and crease-recovery of polymer-treated fabrics of various types. The results indicate that the principal effect at low polymer concentrations is inter-fibre bonding within the yarns. This enhances the dry and wet crease-recovery of the fabric by reducing the voluminosity of the yarn and thereby increasing the openness of the fabric structure. Setting of the crimped configuration of the yarn also helps the crease-recovery. When the modulus of the individual fibres is markedly lowered by wetting, the wet crease-recovery can be substantially improved by the elimination of relative fibre motion within the yarns by the resin bonding. This eliminates the effect of such fibre motion on the crease-recovery and allows the resiliency of the wet fibre to be realized.

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