Understanding About Blend Dyeing Process

About Blend Dyeing:
Blends are any textile material from fibre through yarn to fabric which are deliberate combination of chemically or physically different fibrous polymer.cotton and Polyester blend is an example of chemically different blend and Cotton and Viscose is physically different blend because both are cellulosic.

Object of Blending:
  1. Dilution of an expensive, lusterious fibre by blending with cheaper substitute.
  2. To incorporate of more durable component to extendthe useful life.e.g. core spun yarn.
  3. A compromise to take advantage of disirable performance characteristics,contribute by both fibre component.e.g. P/C blend to get comfort of cotton,strength and crease recovery of polyester.
  4. The development of novel fabric design for garments incorporating multicolour effect.e.g. polyester part is dyed and cotton part undyed.
  5. The presence of attractive appearance using byy combination of yarn of different luster,crimp is possible by blending.
  6. Colourant modification is possible by blending.
  7. Finishing process modification.
  8. Improved moisture absorption.
  9. Reduce anstistatic characteristics pilling.
Process Sequence of P/C Blend Dyeing:




Heat setting



PET dye

Reduction clearing



Cotton dye





Dyeing P/C Blend with Disperse and Vat Dye:


Disperse dye ----------------------------------------X%
Vat dye-------------------------------------------------Y%
Dispersing agent------------------------------------o.5-1%
Wetting agent-----------------------------------------0.5-1%
PH-------------------------------------------------4-5 with acetic acid(30%)

Prepar the bath with dispersing agent,wetting agent and acetic acid.Treatment for 10-15 minute at 50-60 degree C.Then add disperse and vat dye in the bath.Dyeing for 10-15 minute.Raise temp. up to 130 degree C in 60-90 minute.After PET part dyeing cool to 80 degree for proper levelling then add caustic and hydrose and dyeing 15 minute.Cooling to 60 degree c and dyeing for 30 minute for better exhaustion.Rinse with cold water and oxidation with hydrogen per oxide for 15 minute at 50 degree C.Then rinseing with cold water and soaping 95 degree c for 25 minute using 2g/l lissapol.Hot and cold rinse and then final wash off.

Dyeing P/C blend with Disperse and Reactive Dye (Thermosol Process):

Disperse dye -----------------------------------X%
Reactive dye ----------------------------------Y%
Soda ash-----------------------------------------5-20g/l
Migration inhibitor ----------------------------10-20g/l
Wetting agent----------------------------------1-2g/l

Dyeing Procedure:

Padding with disperse and reactive dye at 20-30 degree C. Liquor pick up 60-80%.

Partial drying is done to avoid migration of dyes.Here keep m.c 25%.

Complete and even dyeing at 110-150 degree C.

It's done at 180-220 degree C about 30-45 sec. to fixation dye.Polyester dyeing complete here

Alkali Padding:
Padding at 20-30 degree C.Pick up 50-60%.Caustic and salt used for Procion mx and Procion H.

Steaming is done 103-105 degree C about 30 sec. for procion mx and 45-75 sec.for procion H.

Wash off:
A typical 8 box wash off is given by Cold,hot water and detergent.
Box-1:-------------------------------------water 60 degree C.
Box -2&3:-------------------------------------Detergent 5 gm/l at boil
Box-4&5:---------------------------------------water at the boil
Box-7;-------------------------------------------water 60 degree C.
Box-8:-------------------------------------------Cold water.

By this process blended dyeing is complete............

Author of This Article:
Shareful Islam Palash
Uttara Engineering College, Uttara, Dhaka
Email: palash313@gmail.com

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Mazharul Islam Kiron is a textile consultant and researcher on online business promotion. He is working with one European textile machinery company as a country agent. He is also a contributor of Wikipedia.

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