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
↓
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
↓
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
↓
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