GB828696A - Process for improving the characteristics of textiles composed of blended fibres - Google Patents

Abstract

Yarns composed of a blend of at least two fibre components upon which different shrinkage effects are produced by heat and/or by chemical shrinking agents, or fabrics containing such yarns, are treated with a chemical shrinking agent or heat in such a way that shrinkage is produced upon one component, which is to be accumulated in the interior of the yarn, and mechanical tension is applied to the yarn, either during or after the shrink-producing treatment, to such an extent that the original dimensions of the material are regained, whereby one fibre component is accumulated in the interior of the yarn. The yarns may be multi-ply and the fabrics may be woven or knitted. The material may be subjected subsequently, in tensioned or untensioned condition, to a dimension stabilizing process, including such processes as make the fabric water-repellent, e.g. by the insolubilization within the fibres of thermoplastic or thermosetting resins, and to finishing starching and raising the nap. The fibre blends may be of fibres of basically identical or similar chemical constitution, but wherein one component is pretreated, e.g. by cross-linking or substitution reactions or by applying agents imparting stiffness and bulk to the material, or the blends may be of basically different fibres of native, regenerated or chemically modified cellulose or proteins or of thermoplastic or nonthermoplastic synthetic material. The tension may be applied to yarns by stretching or by twisting and to fabrics in one or more directions. Fabrics may be tensioned by embossing while holding the edges of the fabric. In examples: (1) a fabric composed of nylon/cotton fibres is treated with 30 DEG Be caustic soda at 10 DEG C. and, after subjecting to mechanical pull in at least the weft direction is, while still tensioned, rinsed, neutralized, rinsed and dried; (2) a fabric of nylon/rayon yarns is treated in a slightly tensioned state with 12% hydrochloric acid at 40 DEG C., rinsed and neutralized, dyed, dried on a stenter to its original dimensions and made crease-resistant by treatment with urea-formaldehyde resin; (3) a fabric of nylon/linen yarns is treated as in (1) and with a nylon resist prior to dyeing the linen fibres; (4) a fabric composed of yarns blended from cotton and polyethyleneglycol terephthalate fibres is heated while slack at 210 DEG C., bleached and dried to its original dimensions on a stenter frame.ALSO:Yarns composed of a blend of at least two fibre components upon which different shrinkage effects are produced by heat and/or by chemical shrinking agents, or fabrics containing such yarns, are treated with a chemical shrinking agent or heat in such a way that shrinkage is produced upon one component, which is to be accumulated in the interior of the yarn, and mechanical tension is applied to the yarn, either during or after the shrink-producing treatment, to such an extent that the original dimensions of the material are regained, whereby one fibre component is accumulated in the interior of the yarn. The yarns may be multi-ply and the fabrics may be woven or knitted. The material may be subjected subsequently, in tensioned or untensioned condition, to a dimension stabilizing process, including such processes as make the fabric water-repellent, e.g. by the insolubilization within the fibres of thermoplastic or thermosetting resins, and to finishing processes such as dyeing, mechanical finishing, starching and raising the nap. The fibre blends may be of fibres of basically identical or similar chemical constitution, but wherein one component is pretreated, e.g. by cross-linking or substitution reactions or by applying agents imparting stiffness and bulk to the material, or the blends may be of basically different fibres of native, regenerated or chemically modified cellulose or proteins or of thermoplastic or non-thermoplastic synthetic material. The tension may be applied to yarns by stretching or by twisting and to fabrics in one or more directions. Fabrics may be tensioned by embossing while holding the edges of the fabric. In examples: (1) a fabric composed of nylon/cotton fibres is treated with 30 DEG Be caustic soda at 10 DEG C. and, after subjecting to mechanical pull in at least the weft direction is, while still tensioned, rinsed, neutralized, rinsed and dried; (2) a fabric of nylon/rayon yarns is treated in a slightly tensioned state with 12% hydrochloric acid at 40 DEG C., rinsed and neutralized, dyed, dried on a stenter to its original dimensions and made crease-resistant by treatment with urea-formaldehyde resin; (3) a fabric of nylon/linen yarns is treated as in (1) and with a nylon resist prior to dyeing the linen fibres; (4) a fabric composed of yarns blended from cotton and polyethyleneglycol terephthalate fibres is heated while slack at 210 DEG C., bleached and dried to its original dimensions on a stenter frame.