Process for dyeing a textile material with indigo and arrangement for conducting the process

An arrangement for conducting a dyeing process comprising:

• a) a prewash arrangement (1);
• b) a dyeing arrangement (30);
• the dyeing arrangement including two or more dyeing tanks each containing a solution of reduced indigo and one or more rollers after each dyeing tank;
• said rollers defining a path of travel after each tank, the path of travel after each tank being of a longer duration than the path of travel after the preceding tank to increase the time of oxidation of the reduced indigo after each dyeing tank;
• c) a washing and initial drying arrangement (40);
• d) a sizing arrangement (60);
• and
• e) a drying arrangement (70).

An arrangement for conducting a dyeing process comprising:

• a) a prewash arrangement (1);
• b) a dyeing arrangement (30);
• c) a washing and initial drying arrangement (40);
• d) a sizing arrangement (60);
• and
• e) a drying arrangement (70);
• wherein the dyeing arrangement (30) comprises a series of eight dyeing tanks (35) containing a bath of reduced indigo, a series of rollers (31, 32, 33, 34, 36 and 37) associated with each dyeing tank, the rollers (36) being disposed between each dyeing tank (35) in such a manner that there is one roller (36) between the first and second dyeing tanks (35), two rollers (36) between the second and third dyeing tanks, three rollers (36) between the third and fourth dyeing tanks (35) and so on and so on until the eighth dyeing tank, where there are eight rollers (36), thus enabling the time of exposure to the open air to be progressively increased so that the thread is oxidized in such a way that if the value x is given to the oxidation between the first dyeing tank (35) and the second dyeing tank, the successive result will be:
• Between the 1st and 2nd tanks the oxidation value=x
• Between the 2nd and 3rd tanks the oxidation value=2x
• Between the 3rd and 4th tanks the oxidation value=3x
• Between the 4th and 5th tanks the oxidation value=4x
• Between the 5th and 6th tanks the oxidation value=5x
• Between the 6th and 7th tanks the oxidation value=6x
• Between the 7th and 8th tanks the oxidation value=7x
• After the 8th tank the oxidation value=8x.

An arrangement for conducting a dyeing process comprising:

• a) a prewash arrangement (1);
• b) a dyeing arrangement (30);
• c) a washing and initial drying arrangement (40);
• d) a sizing arrangement (60);
• and
• e) a drying arrangement (70);
• wherein the washing and initial drying arrangement (40) comprises a series of washing tanks (41, 42, 43, 44 and 45) including a first washing tank, a middle washing tank, and a last washing tank, and rollers (46, 47 and 48) associated with each washing tank;
• the first washing tank (41) containing water, the middle washing tank (42, 43 and 44) containing acetic acid, and the last washing tank (45) containing water such that the pH in the last washing tank will be between 6 and 7, and upon exit from the last washing tank (45) a series of rollers (50) is provided for drying the thread.

An arrangement for conducting a dyeing process comprising:

• a) a prewash arrangement (1);
• b) a dyeing arrangement (30);
• c) a washing and initial drying arrangement (40);
• d) a sizing arrangement (60);
• and
• e) a drying arrangement (70);
• wherein the sizing arrangement (60) comprises a sizing tank (62) containing a mixture of resins, the composition of the mixture of resins used in the sizing arrangement comprises a mixture of:
• 10 to 50 g/l of quaternary salts of polyalkylamine;
• 10 to 50 g/l of fluorocarbon resin;
• 10 to 200 g/l of acrylic resin;
• 1 to 20 g/l of autocatalysed polysiloxane;
• and
• 10 to 200 g/l of polyurethane resin.