Reduced indigo dye penetration
AssigneeBurlington Industries, Inc.
InventorsJames E. McFarland, Ellis Davis, Jr., Edward W. Teague
Life of this patent
Estimating the term…
Abstract
Open end spun cotton yarns are ring dyed with a thickened dyebath to limit dye penetration to the outer circumference of the yarn leaving a substantial undyed core. Stonewashed indigo dyed denim fabrics and garments are prepared.
Claims33
A continuous process of controlling the depth of dye penetration and enhancing the ring dyed effect on open end spun cellulosic yarns comprising immersing open end spun cellulosic yarns into a dyebath containing in addition to the dye or dyes at least one polymeric thickening or viscosity control agent compatible with the dye and present in an amount to provide dye penetration of the outer fibers of less than about 20% of the overall cross-section of the yarn with the remaining fibers being substantially undyed core.
A continuous process of altering and minimizing dye penetration into open end spun cellulose yarns to dye the outer fibers and maximizing the amount of white undyed core in the yarn after dyeing, the process comprising immersing open end spun cellulose yarns into a dyebath containing a polymeric thickening agent having a molecular weight of from 5,000 to 30 million present in an amount sufficient so that the dyebath will contain between 0.03 to 2% solids, thereby limiting dye penetration to the outer fibers to less than about 20% of the overall cross-section of the yarn and leaving the remaining fibers as a substantially undyed core.
A continuous process for providing a washed and worn appearance and softened hand to a cellulosic fabric comprising the steps of:
- (a) dyeing open end spun cellulosic yarns by immersing said yarns into a dye bath containing an amount of a polymeric thickening agent sufficient to limit the amount of dye penetration into the open end spun cellulosic yarn to less than about 20% of the overall cross-section of the yarn leaving a ring dyed outer surface and a substantially undyed core;
- (b) forming a fabric using as a warp yarn the yarns dyed in step (a) and untreated open end cellulosic yarn as the fill yarn;
- and
- (c) abrading the fabric formed in step (b) to remove at least a portion of the outer surface of the ring dyed cellulosic fibers therein revealing the underlying undyed portion of the ring dyed cellulosic yarn to provide a fabric having a washed and worn appearance and softened hand.
A continuous process of controlling the depth of dye penetration and enhancing the ring dyed effect on open end spun cellulosic yarns comprising immersing open end spun cellulosic yarns into a dyebath containing in addition to the dye or dyes at least one polymeric thickening or viscosity control agent compatible with the dye in an amount sufficient to limit dye penetration in the yarn leaving an undyed core of at least about 65%, expressed as area of dyed outer fibers related to the overall cross-section of the yarn, the remaining fibers surrounding the core being dyed.
A continuous process for providing a washed and worn appearance and softened hand to a cellulosic fabric comprising the steps of:
- (a) dyeing open end spun cellulosic yarns by immersing said yarns into a dyebath containing an amount of a polymeric thickening agent sufficient to limit the amount of dye penetration into the open end spun cellulosic yarn leaving an undyed core of at least about 65% of the overall cross-section of the yarn and dyed fibers surrounding the undyed fiber bundle;
- and
- (b) forming a fabric using as a warp yarn the ring dyed yarn of step (a) and untreated open end cellulosic yarn as the fill yarn;
- and
- (c) abrading the fabric formed in step (b) to remove at least a portion of the outer surface of the ring dyed cellulosic fibers therein revealing the underlying undyed portion of the ring dyed cellulosic yarn to provide a fabric having a washed and worn appearance and softened hand.
Dependencies are inferred from the claim text.