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Flow Chart of Yarn Dyeing Process

Process Flow Chart of Yarn Dyeing
Rana Sohel
Executive Engineer
Sunman Textile Mills Ltd. Chittagong
Cell: +8801912-420118
Email: rsohel07tex@gmail.com



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
Yarn dyeing in package form
Flow Chart of Yarn Dyeing

Preparatory process

Soft winding

Batching

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