Process Flow Chart of Yarn Dyeing

Yarn Dyeing:
Yarn dyeing is slightly difference from woven or knit dyeing. Dyed yarns are used for making stripe knit or woven fabrics or solid dyed yarn fabric or in sweater manufacturing. Yarns are dyed in package form or hank form by yarn dyeing process. Dyeing process can be vary depending on the individual procedure of a textile engineer or a dyeing master. Now I will give typical flow chart of yarn dyeing. 
 
Yarn dyeing
Process flow chart for 100% Cotton Yarn (Dark/Medium/Light shade):

Pretreatment
Batch loaded

Demineralization (50˚C, 20 min; PH=4.5)

Scouring & bleaching (100˚C×40 min.)

Drain

Rinse

Drain

Neutralization with acid (50°C ×20 min)

Hot Wash with peroxide killer (60˚C,20 min.)

Drain 
 
Dyeing

Leveling agent & Salt (60° × 20 min; PH=6)

Color dosing (60°C×20 min.)

Run time = 10 min. (60°C)

Color migration (80°C × 20 min.)

Cooling (60°C)

Level Check

Soda dosing (60°C×30 min.)

Dyeing run (Dark-60°C×60 min;Medium-60°C×40 min;Light-60°C×
30 min)

Dyeing sample check

(If Ok)

Drain 
 
After-treatment

Rinse (with cold Water)

Neutralization after dyeing (50°C×20 min.)

Drain

Soaping (Hot wash)

Drain

Rinse

Add finishing chemical(60°C×20 min)

Drain

Unload

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