Thermasol Dyeing Method of Polyester Fabric | Dyeing of Polyester Fabric in Thermasol Dyeing Method

Dyeing of Polyester Fabric in Thermasol Dyeing Method
Thermasol method is continuous methods of dyeing with disperse dye. Here dyeing is performed at high temperature like 180-220°C in a close vessel. Here time of dyeing should be maintained very carefully to get required shade and to retain required fabric strength.

Sequence of Dyeing:
This dyeing process is developed by Du Pont Corporation in 1949. here at sufficient temperature the fibres are soften and their internal structure is opened, polymer macromolecules vibrates vigorously and dye molecules diffuse in in fibre. It requires only a few seconds to 1 min and temperature about 200-230°C. The sequence of operation is:


Pading - Drying - Thermofixing - After Treatment

Dyeing Procedure:

  1. At first the fabric is padded with dye solution using above recipe in a three bowl padding mangle.
  2. Then the fabric is dried at 100°C temperature in dryer. For dyeing, infra red drying method is an ideal method by which water is evaporated from fabric in vapor form. This eliminates the migration of dye particles.
  3. Then the fabric is passed through thermasol unit where thermo fixing is done at about 205°C temp for 60-90 seconds depending on type of fibre, dye and depth of shade. In thermasol process about 75-90% dye is fixed on fabric.
  4. After thermo fixing the unfixed dyes are washed off along with thickener and other chemicals by warm water. Then soap wash or reduction cleaning is done if required.
Reduction cleaning recipe:
  • Detergent ------------- 1 g/L
  • Sodium hydrosulphite ---------------- 2 g/L
  • Coustic soda (50 degree ow)------- 1-2 g/L
  • Time ------------------------------------- 30 min
  • M:L ratio ----------------------------- 1:30/50
Soap wash recipe:
  • Soap/Sando clear PC --------------- 1 g/L
  • Temp ---------------------------------- 60 degree celcius
  • Time ----------------------------------- 30 min
  • M:L ------------------------------------- 1:30/50
Advantages of thermosol process:
  1. Dyeing time is very short
  2. No need of carrier
  3. Non toxic
  4. There is no additional problem of removing carrier by using alkali.
  5. Very bright shade is obtained.
  6. Excellent dye utilization (75-90%) is achieved.
Disadvantages of thermosol process:
  1. Shade may be changed due to sublimation at high temp.
  2. Special m/c required
  3. Loss of strength when time of treatment is prolonged.
  4. Costly due to this process requires special arrangement.
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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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