Process Flow Chart of Topping in Reactive Dyeing

Topping in Dyeing: 

Topping is the addition of color to the fabric after completing one dyeing process. Sometimes it is found that the dyed fabrics do not match with the standard or buyer-approved swatch then it needs to re-dyeing, this process is called topping. Topping is similar to the full dyeing process. Normally topping is done in the reactive dye for cotton dyeing. The flowchart of topping in cotton fabric dyeing is given below.

topping in dyeing

Flow Chart of Topping in Reactive Dyeing

Water fill at the required amount

Fabric loaded and running for 10 min.

Drain out

Water was filled at the required amount

Acetic acid was added for 5 min.

The temperature increased at 60 ºC

Run for 20 min.

Rinsing for 10 min.

Drain out

Require amount of water-filled

A wetting agent was added

The temperature increased at 95 ºC

Run for 30 min.

Ringing for 20 min.

Leveling agent added for 10 min.

Salt dosing

Color dosing for 30 min

Run for 10 min

Soda dosing

Run for 1 hrs

Temperature increase at 60 0C for 5 min

Run for 10 min

Shade check (OK)

Rinsing for 20 min.

Drain out

Acetic acid was added for neutralization for 10 min

Shade check (ok)

Hot wash at 70 0C

Rinsing for 10 min.

The fixing agent was added for 10 min

Rinsing for 10 min.

Water was filled at the required amount

PH check at 5.5

Softener was added

Final shade checks and run for 20 min

Unload the dyed fabric 

The reactive dye used in the exhaust dyeing method can make price effective with pigment topping but a maximum range up to 10% range in garment cotton knitted fabric. Otherwise, collar to body portion difference will be observed more but according to customer demand, it has to do cost-wise economical also. In a garment, more dye addition in reactive dyeing patchiness chances will be more whatever shade is coming the first time its tone can be adjusted with pigment topping within a short time.

 Author of this Article:

Rana Sohel 
Executive Engineer 
Sunman Textile Mills Ltd. Chittagong 
Cell: +8801912-420118 
Email: rsohel07tex@gmail.com

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