January 23, 2009

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

7 comments:

sallahud said...

it is possible that our obsorbency is ok and inner outer shade will b same.

RITESH said...

WHAT SHOULD BE THE WATER CONSUMPTION/KG IN CASE OF FULLY FLOODED YARN DYEING MACHINE WITH MLR 1:7.5 IN CASE OF REACTIVE DARK SHADE

Nissiwebmaster said...
This comment has been removed by the author.
Nissiwebmaster said...

When choosing a nylon yarn, it is typically important to choose a type which will suit your project. Some yarns have a more rough feel and might not be good for garments, but are adequate for rugs or tapestries.

http://www.rjkimpex.com/yarn_products.php

Swords said...

Absolutely fantastic Yarn Dyeing Post! Lots of great information and inspiration, both of which we all need!Thank you for another great article. Where else could anyone get that kind of information in such a perfect way of writing?

kesavamurthy said...

It is a very good article, very useful for dyeing and processing technicians.Regarding the pressure maintained in inout and outin during lycra dyeing,pl.suggest us in Kg/cm2 or Lb/in2

Deepesh said...

i think the acetic acid is been overused in the process. just making the process costlier