Apparatus for dyeing cellulose fiber material by controlled addition of alkaline material

Claim 1

Apparatus for dyeing cellulose fibers and mixtures thereof with other fibers in a bath containing at least one reactive dyeing agent in the presence of an alkaline material for fixation of said dyeing agent comprising: a vessel for containing a bath of cellulose fibers and a dyeing agent; pump means for progressively adding an alkaline material to said vessel and bath; and control means for regulating said pump means to deliver an alkaline material automatically to said vessel progressively and in a substantially continuous manner over a predetermined time interval, said control means limiting the amount of said alkaline material so delivered in an initial phase of said time interval and increasing same to a largest amount in a final phase of said time interval until a sufficient amount of alkaline material has been delivered to said vessel to fix said dyeing agent on said cellulose fibers, and said control means including means for choosing between different timing intervals for the supply of alkaline material and for choosing between different degrees of progression for the supply of alkaline material.