Polyester is a popular man-made fiber. It has a huge market for making apparel. Polyester can be dyed with disperse dye in different methods. Carrier method, High temperature high pressure method and Pad-thermos methods are available for polyester fabric dyeing. There are basic differences between carrier, hthp, pad-thermosol methods. But HTHP method is mainly used because the other methods have some drawbacks.
Carrier Method
The carrier method is used in polyester dyeing. Here carriers are used to swell the polyester fiber as polyester is hydrophobic fiber. It enables the dyeing procedure at atmospheric temperature.
HTHP Method
In the HTHP method, high temperature does the job of opening up the molecular space in the polyester. It carries 130 degrees Celsius. It is a widely used method for polyester dyeing. The carrier method has many drawbacks whereas pad-thermosol method requires huge energy. So, the most suitable method for polyester dyeing is the HTHP method.
Pad-thermosol Method
Pad-thermosol procedure is carried out at 180-220 degrees Celsius. This process uses high heat energy to dye polyester fibers.
Though disperse dye is used for polyester dyeing, Basic dyes too can be used for dyeing cationic dyeable polyester. For basic dye, there is no need of any dispersing agent like disperse dye.
Differences between Carrier-HTHP- Pad thermosol Method
Carrier method | HTHP method | Thermosol method |
Carrier is required no thickener is used | Neither carrier nor thickener is used | Carrier is not used but thickener used |
Lower dyeing Temperature (80°- 100°C) | Higher dyeing temperature (125°- 140°C) | Very high temperature (180°- 220°C) |
Costly, as carrier used | Not so costly / Cheap | Costly, due to this process required special arrangement |
Toxic and unhygienic process due to carriers | Non-toxic and hygienic process | Non-toxic and hygienic process |
Removal of carrier is difficult and alkali is used | Not applicable | Not Applicable |
No change is shade | No change in shade | Change in shade due to sublimation |
More shrinkage | Most shrinkage | less shrinkage |
Less production | Less production | High production due to continuity |
The Last Word
Among the three methods, the most suitable one is HTHP method. Want to know more about it? Click Here