Process Flow Chart of Yarn Dyeing
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: [email protected]
Yarn Dyeing:
Yarn dyeing is a special type of dyeing process. This dyeing process 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. Yarn can dye in two form, package or hank form. Flowchart of yarn dyeing can be divided into three stages. Preparatory process, Dyeing and After-treatment process.
| Yarn dyeing in package form |
Flow Chart of Yarn Dyeing
Preparatory process
Soft winding
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↓
Batch loaded
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Demineralization (50˚C, 20 min; PH=4.5)
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Scouring & bleaching (100˚C×40 min.)
↓
Drain
↓
Rinse
↓
Drain
↓
Neutralization with acid (50°C ×20 min)
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Hot Wash with peroxide killer (60˚C,20 min.)
↓
Drain
↓
Dyeing
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Leveling agent & Salt (60° × 20 min; PH=6)
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Color dosing (60°C×20 min.)
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Run time = 10 min. (60°C)
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Color migration (80°C × 20 min.)
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Cooling (60°C)
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Level Check
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Soda dosing (60°C×30 min.)
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Dyeing run (Dark-60°C×60 min;Medium-60°C×40 min;Light-60°C×
30 min)
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Dyeing sample check
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(If Ok)
↓
Drain
↓
After-treatment
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Rinse (with cold Water)
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Neutralization after dyeing (50°C×20 min.)
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Drain
↓
Soaping (Hot wash)
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Drain
↓
Rinse
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Add finishing chemical(60°C×20 min)
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Drain
↓
Unload
