DYEING PROCEDURE
Contd... from Page 1
One batch
pad-dry steam processed on machines with padder, drying unit, and also a
continuous steamer as normally used in printing.
The pad liquor consists of :
|
X g/l |
Dyestuffs |
|
100 g/l |
Urea |
|
Y cc/l |
Water
|
|
10 g/l |
Mild Oxidising
agent |
|
10-20 g/l
|
Sodium
Bicarbonate |
The material
is padded at room temperature in the above liquor at a nip expression of 60-70%,
dried at 60oC-80oC and then fixed by steaming in the
normal continuous steamer for 7-10 minutes at 100oC-130oC
Two
Bath
pad-dry steam process,
Pad the material through dyestuff solution at 25-35oC & dry. After
intermediate drying the goods are padded at room temperature using:
250-300
g/l common salt and
20 cc/l caustic soda 71oCTw
The dyestuff is fixed by steaming at 103-1050C for 20-30 seconds. For
longer steaming time of 90-120 seconds the caustic soda solution be reduced to
10 cc/liter. While working without intermediate drying the chemical padding
should 25% higher expression and chemical liquor should contain:
|
250-300 g/l
|
Common salt |
|
80 cc/l |
Caustic soda
solution 71oCTw |
|
20-25oC
|
Padding
temperature |
Steaming is carried out for 20-30 seconds at 103-1050C. For 100
seconds the caustic soda is reduced to 20 cc/l (710CTw)
Pad-Dry thermofix process,
In this
process a padding machine with attached hot flue and curing unit that allows
treatment for 5 minutes is essential.
The pad liquor consists of: (parts/1000)
|
Dye |
Urea |
Soda
Ash |
|
2
10
20
40
60 |
15
30
45
60
80 |
8
12
17
25
33 |
For inferior varieties of cloth and on the drying equipments where fear of
dyestuff migration is their. Add 5 to 10 g/l of sodium alginate paste thickening
to the padding liquor is necessary.
Contd. on Page 3
| 
