Process Flow Chart of Yarn Dyeing in Yarn Dyeing factory

Yarn dyeing is the special types of dyeing process. Yarns are dyed in package form or hank form by yarn dyeing process. It is slightly different from woven or knit dyeing.

Below we are explaining the general process of yarn dyeing with details breakdown.

Process Flow Chart of Yarn Dyeing in Yarn Dyeing Floor:

Gray Yarn

↓

Soft Winding

↓

Batch Loading

↓

Scouring/bleaching

(100˚C×30 min. = Scouring

     105˚C×30 min. = Bleaching)

(Recipe: Bluefairy – 1.2g/l

Caustic Soda – 1g/l

H₂O₂ – 3g/l)
↓
Drain
↓
Rinse
↓
Drain
↓
Neutralization with acid (50°C ×20 min)
↓
Hot Wash with peroxide killer (70˚C,20 min.)
↓
Drain

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

[For deep Shade, Salt is given after 5 min. from giving leveling agent]
↓
Color dosing (60°C×30 min.)
↓
Run time = 10 min. (60°C)
↓
Color migration

(90°C × 20 min.= Light Shade

  70°C × 20 min.= Deep Shade)
↓
Cooling (60°C)
↓
Level Check
↓
Soda dosing (60°C×30 min.,pH=11)

[For Turkish color – 3 times soda dosing,10 min per dosing]
↓
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 with acetic acid (50°C ×20 min,pH=6)
↓
Hot Wash (60˚C,20 min.)
↓
Drain
↓
Soaping (Hot wash)
↓
Drain
↓
Rinse
↓
Fixing [Check Fastness]
↓
Add finishing chemical(Mainly Softener)
↓
Drain
↓
Unload

↓

Hard Winding

Ref.:

1. Based on “Industrial Attachment on Asian Textiles Mills Ltd” by Fatema Akter, Md. Kamrul islam, Jishan  Ahmed &Al-Amin under supervision of  Kawser Parveen Chowdhury, Lecturer, Department of wet Processing Engineering, Bangladesh University of Textiles.
2. http://textilelearner.blogspot.com