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