Flow Chart of Dyeing for Dark Shade

Shade variation is a common and most painful word for a dyeing manager. Because matching dyeing shade is a very complex task. There are three types of shade; light shade, medium shade, and dark shade. In this article, I will give a flowchart of the fabric dyeing for a dark shade.

Dyeing for Dark Shade
Different shade

Process Sequence of Dyeing for Dark Shade:

At first, the bath is set at 50° C & take the right volume of water in the dye bath.

The required amount of the wetting agent is added.

Caustic soda is added & the second heat command 60°C & stabilizer are added also.

H202 is dosed & 10′ runs.

Temperature raised to 98°C & run the material for 30′

Cooling the bath at 75°C & bath is drained

At 90° C, the material is run for 15 mins

Cooling the bath to 75°C to drain

Add Acetic Acid to neutralize the whole bath of fabric & run time is 20′

Rinse the fabric for 5′ & the bath is drained.

New water from reserver is taken & pH should be 4.5-5.

An enzyme is injected into the bath. Run time is 60′ at 55°C

Temp. raised to 70° C & run time 10′ & then drain

Again new water is taken & dosing of Glauber salt for 20′ & pH should be check
(pH =7)

Color dosing for 30′ at 50°C

Soda is added by dosing for 40’at 50°C

Then raise the temp. & run the fabric for 35-60′.At this time after every 10′ the sample is checked.

Rinse the material for 10′ & the bath is drained.

At room temp. acid treatment is done for 20’& rinse the material for 5′

Soaping is done at 90°C for 10 min & the bath is drained.

Fixing agent is added at 50° C & run time is 20′ & bath is drained

Softening is done at 60° C for 20’& the bath is drained.

Finally, the fabric is unloaded.

Author of this Article
Rana Sohel 
 Executive Engineer 
 Sunman Textile Mills Ltd. Chittagong 
 Cell: +880 1912 -420118 
 Email: rsohel07tex@gmail.com

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