One-Bath Two-Stages Dyeing of PC Blend With Disperse-Reactive Dye

Last updated on July 30th, 2023 at 11:39 pm

Usually, this method is used for dyeing of knit fabric and yarn in winch, Jet, beam or package dyeing machine. In this method, the polyester part is dyed first with disperse dyes and then dye the cotton part with bi-multi-functional type reactive dyes in the 2nd stage.

Typical Recipe for Polyester Part

Dispersing agent = 0.5 – 1.0 g/l
Sequestering agent = 1.0 – 2.0 g/l
Levelling agent = 1.0 – 2.0 g/l
Buffer solution = 0.5 – 1.0 g/l (To maintain pH 4-5)
Disperse dyes = x%
Temperature = 130-1350 C
Time = 30 – 60 min
M : L = 1 : 5 – 1 : 10

Preparation of Disperse Dye Solution

Disperse dyes are water insoluble thus need to make a dispersible (partially soluble) solution by stirring with warm water. If necessary, add dispersing agent with it and stir rapidly.

disperse-reactive dyeing

Typical Recipe for Cotton Part

Wetting agent = 0.5 – 1.0 g/l
Reactive dye = x%
Salt = 4 g/l
Soda = z g/l
Temperature = 50 -600 C
M : L = 1 : 7
PH = 10 – 11

Working Procedure

Set the dye bath with substrate at 500 C temperatures and add dispersing, leveling, buffer (pH around 4-5) and other auxiliaries, then run the dye bath for 5 – 10 min. Add (By dosing) dye solution of disperse dyes and raise the temperature to 800C by 30/min. Raise the temperature from 800C to 1300C by 1.50C/min.

Run the bath for 30-60 min at the same temperature. Lower down the bath temperature 80-900C over 10-20 min and add alkalis (e.g. tri-sodium phosphate) for neutralization (to drop the pH around 7).

Add (By dosing) reactive dyes with salt accordingly to recipe and run for 20-30 min. lower down the temperature to 600C and add alkalis (soda ash) and run for 30 – 60 min. Drop the dye bath and carry on the after treatment process.

After-Treatment Process

Rinse twice with hot and cold water successively. Treat the fabric with detergent 1-3 g/l and caustic soda 1-3 g/l at 800C about 15 minutes.

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He is Abu Sayed, the founder of the blog site Textile Apex. He is a Textile Engineer having eight years plus practical experience in the Textile and Clothing industries. With a deep love for fashion and a keen eye for detail, he combines his creative flair with extensive knowledge to offer insightful and engaging content to his readers.
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One thought on “One-Bath Two-Stages Dyeing of PC Blend With Disperse-Reactive Dye

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