Process and apparatus for production of yarn having longitudinally variable dye uptake
AssigneeInvista North America S.A.R.L.
InventorScott Paul GALBRAITH, Jr.
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Abstract
Apparatuses and processes for producing yarn having longitudinally variable dye uptake and well as yarns having longitudinally variable dye uptake and articles prepared from these yarns are provided.
Claims27
A method for producing yarn having longitudinally variable dye uptake comprising:
- a) providing a yarn;
- b) partially wetting the yarn to provide discontinuous wet and dry regions along the length of the yarn;
- c) heating the discontinuously wetted yarn to impart longitudinally variable dye uptake to the yarn.
The process of any one of the preceding claims wherein the yarn comprises continuous filaments.
The process of any one of the preceding claims wherein the heating is performed by radiant, convective or conductive heat transfer.
The process of 9 wherein the steam is superheated or saturated.
The process of any one of the preceding claims wherein the yarn remains discontinuously wetted upon entering the heating step.
The process of any one of the preceding claims wherein the yarn comprises a dyeable polymer.
The process of 14 wherein the nylon is the product of a condensation reaction.
The process of any one of the preceding claims wherein wetting step (b) is performed using a fluid dispensing system.
The process of any one of the preceding claims wherein the yarn is wetted in step (b) for a period of about 0.5 to about 7 seconds.
The process of any one of the preceding claims wherein wetting step (b) is performed under hot air at a temperature in the range from about 110° C. to about 150° C.
The process of any one of the preceding claims wherein step (c) is achieved with saturated steam at a temperature in the range from about 120° C. to about 160° C.
The process of any one of the preceding claims wherein step (c) is performed for a period of about 25 to about 60 seconds.
An apparatus for producing yarn having longitudinally variable dye uptake, said apparatus comprising a fluid dispenser system for discontinuously wetting yarn and a guide for transferring the discontinuously wetted yarn to a heater.
Yarn of uniform composition and cross-sectional size having controlled variable dye uptake along its length.
Dependencies are inferred from the claim text.