Importance

Loading Importance Indicators...

Abstract

The invention relates to a process for dyeing a thread with indigo, characterized in that it comprises the following steps: a. prewashing a thread F by passing it through a prewash arrangement (1) comprising two or more tanks (2) containing a prewash solution (10, 15); b. then dyeing the thread by passing it through a dyeing arrangement (30) comprising a series of tanks (35) each containing a solution of reduced indigo, and when passing from one tank (35) to another, the thread is subjected to oxidation by exposure to the air transforming the reduced indigo into indigo, which then dyes the thread by impregnation, the oxidation by exposure to the air being achieved in such a way that when passing from the first tank (35) to the eighth in succession, if the value x is given to the oxidation between the first and second tanks, the result will be: After the 8th tank the oxidation value=8x; c. washing and initial drying the thread by passing it through a washing and initial drying arrangement (40). d. sizing the dyeing of the indigo on the thread by passing it through a sizing arrangement (60) comprising a tank (62) containing a mixture of resins to form a transparent film on the fibers of the thread; e. drying the thread by passing it through a drying arrangement (70) comprising rollers (71); and f. collecting the warp thread by rolling it on a drum (72).

Loading the Abstract Image...

First Claim