High Temp Dyeing Method on Polyester Fabric | Dyeing of Polyester Fabric in High Temperature Dyeing Method

In high temperature dyeing method either material or liquor should circulate. Otherwise dye molecules will not penetrate inside the material. They will stay on surface only. In this method, temperature is kept in between 105-140°C and pressure is kept from 0 to 170kPa.
This method is also known as pressure dyeing which is used for highly crystalline synthetic fibers and their blends. This technique causes the fiber to swell even more than which achieved at 100°C temperature. So that dye molecules penetrate the fiber polymer system. It eliminates the need of carriers.

Recipe:

1. Dye = x% owf
2. Dispersing agent = 1g/L
3. Acetic acid = 1-2 g/L
4. Temperature = 1300C
5. Time = 1 hr.
6. P^H =  4-5.5
7. M:L = 1:10

Procedure

1. At first a paste of dye and dispersing agent is prepared and then water is added to it.
2. P^H of bath is controlled by acetic acid at 4-5.5.
3. The dye bath is kept at 600C temperature and all the chemicals with material are added to it and it is kept for 15 min.
4. Now the temperature of bath is raised to 1300C and it is continued for 60 min.
5. The dye bath is colored as early as possible after dyeing at 600C
6. The fabric is hot rinsed and reduction cleaning is done if required. It is done for improving the wash fastness.
7. Then the fabric is finally rinsed and dried

Dyeing curve: The dyeing curve is given below