Patent GB-1028020-A (GB)
Title: Woven cotton-polyester blend fabrics having recoverable stretch characteristics
IPC: D06P1/00
Filed: 1964-02-03
Abstract: Woven fabrics having widthwise recoverable stretch characteristics, which may be used in the manufacture of vinyl, rubber, pyrosylin or polyurethane coated textile materials in which resiliency in one direction is required, are produced by (a) wetting a fabric comprising a blend of cotton and polyester fibres with an aqueous solution of sodium hydroxide of mercerizing strength, (b) maintaining the wetted fabric under tension in the warpwise direction and in an untensioned condition in the filling direction while the sodium hydroxide causes it to shrink in width and thereby crimp the filling yarns, (c) washing the fabric to remove the sodium hydroxide and (d) treating it to stabilize at least one of the cotton and polyester fibre constituents of the filling yarns in their crimped state.  The fabric may be impregnated with a thermosetting resin e.g. a triazineformaldehyde or triazone-formaldehyde resin, and a catalyst, e.g. magnesium chloride, or with a cross-linking agent, e.g. formaldehyde or divinyl sulphone and cured at 320 DEG - 340 DEG F. for 1-3 minutes to stabilize the cotton fibres or the dried fabric may be subjected to a heat setting operation to stabilize the polyester fibres after passage through a bluing mix containing a fluorescent dye and drying.  The treated fabrics have a stretch of at least 15% in the filling direction and a permanent set of less than 20%.ALSO:Woven fabrics having widthwise recoverable stretch characteristics are produced by (a) wetting a fabric comprising a blend of cotton and polyester fibres with an aqueous solution of sodium hydroxide of mercerizing strength, (b) maintaining the wetted fabric under tension in the warpwise direction and in an untensioned condition in the filling direction while the sodium hydroxide causes it to shrink in width and thereby crimp the filling yarns, (c) washing the fabric to remove the sodium hydroxide and (d) treating it to stabilize one at least of the cotton and polyester fibre constituents of the filling yarns in their crimped state.  Prior to treatment the fabric may be desized, e.g. using a mixture of amylolytic and proteolytic enzymes, scoured, bleached with hydrogen peroxide, singed and dried and may then be treated with a sodium hydroxide solution having a specific gravity of 52-54 degrees Twaddle under warpwise tension but free from tension or under limited tension in the filling direction, washed with water having a temperature of 160-180 DEG F. and if desired containing a small amount of acid and dried while still under warpwise tension but slack in the filling direction.  The fabric may then be impregnated first with an anionic wetting agent and then with a thermosetting resin e.g. a triazine-formaldehyde or triazone-formaldehyde resin, and a catalyst, e.g. magnesium chloride, or with a cross-linking agent, e.g. formaldehyde or divinyl sulphone and cured at 320-340 DEG F. for 1-3 minutes to stabilize the cotton fibres.  The fabric may then be washed, dried, softened by passage through a composition comprising softeners, lubricants and vat pigments, dried and shrunk on a compressive shrinking machine.  Alternatively the dried fabric may be subjected to a heat setting operation to stabilize the polyester fibres after passage through a bluing mix containing a fluorescent dye and drying.  After the heat setting treatment the fabric may be treated with softeners, lubricants and dyes, dried and shrunk on a compressive shrinking machine.  The treated fabrics have a stretch of at least 15% in the filling direction and a permanent set of less than 20%.