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
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.
Typical Recipe for Cotton Part
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.
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.