Package Dyeing (HT HP) - Cheese Yarn Dyeing-II

Reactive Dyeing of cotton yarn in cheese form:

Whether it is Vinylsulphone or Bifunctional dyestuff, you may follow the following dyeing cycle for yarn dyeing:

The Chemical table shown below contains a Code No. that has to be included time to time when the dyeing process is going on.

Code No	Name of Chemical	Grams/liter
1	Acetic Acid	0.5
	Sequestering Agent	0.5
2	Acetic Acid	0.5
	Vacuum Salt or Glauber's Salt	As Recommended
3	Dyestuff	O.W.F.
4	Soda Ash	As Recommended
5	Acetic Acid	0.5
6	Sequestering Agent	0.5
	Anionic Soap	0.5
7	Acetic Acid	0.5
8	Dye fixing Agent	Not Necessary
9	Softener	1.0

Processing Cycle for Yarn Dyeing:

• Set the dye bath with soft water at ambient temperature and as per MLR
• Enter the RFD (Ready For Dyeing) yarn in to the processing vessel.
• Add Chemical [Code-1]. Circulate for 3 minutes (In -> Out) and hold for 10 minutes. Drain.
  
• Check pH. It should be 6 - 7. Check for channeling.
• Fill cold water, add chemicals [Code-2], Circulate for 5 minutes (In -> Out) and hold for 10 minutes.
• Raise temperature to 40°C and hold for 5 minutes.
• Add dissolved dyestuff [Code-3] in 2 to 3 portions with Out -> In circulation at 40°C.
• Raise temperature to 60°C @ 1.5°C/minute and hold for 15 minutes.
• Add Chemicals [Code-4] in two parts with In->Out circulation and run for 45 minutes.
• Check the sample and drain the dye bath.
• Rinse at room temperature for 5 minutes and drain.
• Give overflow rinse as per the dept of shade - 3 to 5 minutes.
• Fill fresh water, add chemicals [Code-5] and hold for 5 minutes. Drain.
• Fill hot water (60°C), add chemicals [Code-6] and circulate for 3 minutes.
• Raise the temperature to 95°C and run for 15 minutes. Drain.
• Rinse at 70°C for 10 minutes followed by 5 minutes overflow wash. Drain.
• Fill fresh cold water, add chemicals [Code-7] & [Code-8] and circulate for 3 minutes, hold for 15 minutes and then drain.
• Fill Cold water, add chemicals [Code-9], circulate for 3 minutes and hold for 10 minutes. Drain.
• Unload the batch.

Notes on Dyeing:

1. For Shades above 7%, two soaping operations are necessary.
2. Dye fixing is optional but not a substitute for thorough washing.
3. Pressure difference during In->Out and Out ->In operations has to maintain a constant.

In->Out 100 - 140 KPA
Out->In 90 - 120 KPA