Process for indigo dyeing of wool and wool blends
AssigneeMalwa Industries Limited
InventorsJangi Lal Oswal, Rishi Oswal
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Abstract
A process for indigo dyeing of wool and wool blends comprising the steps of subjecting the wool and wool blends to a step of pretreatment by impregnation with a shrink resistance agent, subjecting the pretreated wool and wool blend yarns to the step of indigo dyeing and post dyeing, wherein the step of dyeing and post dyeing includes a single step or a plurality of steps of impregnation of the pretreated wool and wool blends in an indigo dye bath followed each time by the step of oxidation.
Claims9
A process for continuous dyeing of pretreated wool and wool blends with indigo to produce dimensionally stable wool and wool blends, comprising, in order, the steps of:
- subjecting shrink-resistant, dimensionally-stable pretreated wool and wool blends to at least one step of wetting and pre-dye washing;
- subjecting said pretreated wool and wool blends to at least one step of indigo dyeing, and oxidizing to form a dyed wool and wool blend;
- and
- subjecting the dyed wool and wool blend to at least one step of post-dye washing,
- wherein, the at least one step of post-dye washing includes at least one hot wash and/or acid wash;
- wherein the steps of dyeing and oxidizing together are less than about 5 minutes in duration per each at least one step of dyeing and oxidizing to form a dyed wool and wool blend;
- and
- wherein the steps of pre-dye washing, dyeing and oxidizing and post-dye washing are continuous in a same machine.
Dependencies are inferred from the claim text.