Dyeing Procedure of disperse dyes

1. High temperature high pressure dyeing

High temperature high pressure dyeing is carried out using a closed type dyeing machines such as chease, beam, jat, jig or liquor flow type according to the form of the material.
General dyeing conditions are as follows:
- About 1-2g/L dispersing agent is added to dyeing liquor and then PH value of the liquor is adjusted to 5-6 with acetic acid or buffer solution (acetic acid and sodium acetate). The dyeing liquor is then gradually raised from 40-60°C to 125-135°C, and in this temperature the dyeing is continued for 30-90 min.
- And also dyeing temperature and dyeing time differ with the form of the material, the dye concentration and dyeing apparatus. Therefore, it is important to select the suitable dyeing condition.

- After dyeing by various methods, reduction cleaning is carried out generally, unfixed dye on the fiber surface is removed by this treatment.
- Color of the dye itself as well as good rubbing and wet fastness are obtained.
- The condition of reduction cleaning is generally as follows:
   2g/L Hydrosulphite
   3ml/L caustic soda 38°Be
   Temperature:70°C    Time: 10-15 min

2. Carrier dyeing

Carrier dyeing is carried out under atmosphere pressure by an addition of carrier to the dyeing liquor. Methylnaphthalene or chlorobenzene type carrier is used generally, which is added in concentration of 2-7 g/L to the dyeing liquor.
Other conditions of the dyeing liquor are the same as those for high temperature dyeing. The temperature is raised gradually from 40-60°C and continued for 90-120 min at 100°C.
In carrier dyeing, in some case the troubles such as tarring of dye or carrier spot are taken from the no stability of emulsifier in the carrier under high temperature or some other conditions. Therefore, it is necessary to select the carrier so as to prevent the troubles.

Reduction cleaning as stated in high temperature high pressure dyeing.

3. Thermosol dyeing

Thermosol dyeing is a continuous dyeing method which is applied mainly for the polyester/cotton blended materials. General dyeing condition is as follows.

Dye and 0.5-2g/L of migration inhibiter (for example, sodium alginate) and also wetting agent if necessary are added to the padding liquor.

Squeezing is carried out 1dip 1 nip at room temperature, pic up 65-70%. Drying at 70-90_C.

After padding and intermediate drying, therosol fixation is carried out by dry heating for 60-120 sec. at 180- 210°C depending on the form of the material and type of disperse dyes.

- E type: 180-190°C x 60-120 sec
- SE type: 180-200°C x 60-120 sec
- S type: 200-210°C x 60-120 sec
Reduction cleaning as stated in high temperature high pressure dyeing.

4. Printing

Printing methods are roughly divided into the following classification:

Direct printing
By printing style Discharge printing
Resist printing
Hand printing
By printing apparatus Screen printing
Roller printing
The other

5. Fastnesses

Light fastness (xenon) GB/T 8427-1998(EQV.ESO105B02:1994)
Washing fastness GB/T 3921.3-1997(EQV.ISO 105 C03:1989)
Rubbing fatness GB/T 3920-1997 (EQV.ISO 105 X12:1993)
Sublimation fastness GB/T 5718-1997 (EQV.ISO 105 P01:1993)

NOTE

V-very suitable
S-suitable
U-unsuiatble