Importance

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Abstract

The invention relates to a process for dyeing a textile fabric with indigo by using indoxyl which comprises the following stages: a. pre-washing a thread F by passing it thorough a pre-wash system (1) composed of two or more vats (2) containing a pre-wash solution (10,15); b. subsequently dyeing the thread by passing it through a dyeing system (30) composed of a series of eight vats (35), each containing an indoxyl solution, and, during its passage from one vat (35) to another, the thread undergoes oxidation by exposure to air, the indoxyl converting to indigo which then dyes the thread by impregnation, the oxidation by exposure to air being performed in such a way that, during the passage from the first vat (35) to the eighth in succession, if a value x is given to oxidation between the first vat (35) and the second, the following values will be obtained successively: oxidation value between 1st and 2nd vats=x oxidation value between 2nd and 3rd vats=2x oxidation value between 3rd and 4th vats=3x oxidation value between 4th and 5th vats=4x oxidation value between 5th and 6th vats=5x oxidation value between 6th and 7th vats=6x oxidation value between 7th and 8th vats=7x oxidation value after 8th vat=8x; d. sizing the indigo dye onto the thread fibers; e. drying the thread; f. collecting the warp thread by winding it onto the spool (72).

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First Claim