Patent ID: 6355073
Filing Date: 2002-03-12
Classification: D06B

Abstract:
A process for continuous dyeing of warp yarn, comprising the steps of:(a) feeding a band of parallel unbundled warp yarns between a first pair of squeezing rolls downwardly beneath a lower end of a sealed airtight reactor through a first dyeing vessel filled with a dyeing liquor in which said lower end is immersed; (b) thereafter passing the band upwardly and downwardly in said reactor over respective rollers including rollers at said lower end of said reactor maintaining a water-lock sealing of said reactor against the exterior; (c) squeezing said band between a second pair of squeezing rolls at said lower end of said sealed reactor and in a second dyeing vessel and with a variable squeezing pressure; (d) fixing a color of the dyed band in said reactor above said vessels while passing said band over guide rollers and excluding oxygen from the reactor; (e) controlling a residence time of said yarn in said reactor to vary a shade of color to be produced without repeated immersion in fresh dyeing liquor; and (f) supplying dyeing liquor at least to said first dyeing vessel with a hydraulic system beneath the reactor.