Process for dyeing a textile with indigo using indoxyl and installation for putting into practice the procedure.

摘要

The invention relates to a process for dyeing a textile material with indigo using indoxyl comprising the steps of: a. prewashing a thread F by passing it through a prewash installation (1) comprising two or more vats (2) containing a prewashing solution (10, 15); bb Dyeing the thread by passing it through a dyeing (3) comprising a series of eight vats (35) each containing a solution of indoxyl, and during the passage of a Cuba (35) to another, the thread undergoes oxidation by exposure to air which transforms the indoxyl to indigo which then dyes the thread by impregnation, then performing oxidation by exposure to air such that, passing successively from the first Cuba (35) to the eighth, if da the value xa oxidation between the first Cuba (365) and second, it will successively between first and second Cuba oxidation value = x between the second and third Cuba l value deoxidación = 2x between the third and the fourth Cuba oxidation value = 3x between the fourth and fifth Cuba oxidation value = 4x between the fifth and sixth Cuba oxidation value = 5x between the sixth and seventh Cuba oxidation value = 6x between the seventh and eighth Cuba the = 7x oxidation value after the eighth Cuba oxidation value = 8x. c. Wash and preclean the thread by passing it through a washing and precleaning (40) comprising a series of vats (41, 42, 43, 44, and 45) containing the first Cuba (41) water, containing vats (42, 43 and 44) ​​acetic acid and containing Cuba (45) water such that the pH in the last Cuba, will be between 6 and 7 acid, and out of Cuba (45), the thread prelimpia making passed between the rollers (50). d. Fix the dye indigo on the thread by passing it through a bonding facility (60) comprising a Cuba (62) containing a mixture of resins to form a film transparentesobre yarn fibers; and. Drying the thread by passing it through a drying installation (70) comprising rollers (71); F. Collecting the warp thread by winding it on the drum (72).