|
These dyes react with cellulosive
fibres in presence of alkali & heat.The
direct chemical linkage which result therby
accounts for excellent fastness. The reaction
between cellulosive fibres and Spectron
range of dyes can be achieved by any of
the follwoing method.
(1) ONE PHASE METHOD
- Streaming Process
- Dry Heat Process
(2) TWO PHASE METHOD
- Pad Silicate Batch Process
Printing Paste Recipe :
| |
One
Phase method |
Two Phase Method |
| Dyestuff |
10-60 Parts |
10-60 Parts |
| Urea |
50-100 Parts |
50-100 Parts |
| Hot water |
300 Parts |
300 Parts |
Thickener
(Sodium Alginate 4%) |
350-400 Parts |
350-400 Parts |
| Resist salt |
10 Parts |
10 Parts |
| Sodium Bicarbonate |
15-30 Parts |
- Parts |
| Water |
X Parts |
X Parts |
| TOTAL |
1000 Parts |
1000 Parts |
(1) ONE PHASE METHOD
- Streaming Process :
Print-->Dry-->Stream 10 min at 100-102°C-->Wash
- Dry Heat Process :
Print-->Dry-->Bake for 5 min at
105°C-->Wash or 1 min at 200°
C
(2) TWO PHASE METHOD
- Pad Silicate Batch Process
:
Print(Dyestuff paste without alkali)-->Dry-->Silicate
pad(Sodium Silicate 100-106°Tw.)-->24
Hrs. Batch-->Wash
Discharge Printing
:
V.S.Based dyes are suitable
for discharge printing.Cotton fabrics discharge
is better than spun viscose fabrics.Prior
to discharge priting the dyed fabric should
be treated with resist salt 10gms/lt.to
protect the dyed ground shade from reducing
effect.
Discharge Printing Paste Recipe
:
| Thickener |
500
Parts |
| Rangolite |
150-200
Parts |
| Titanium
Dioxide |
100
Parts |
| Caustic
Soda |
100-200
Parts |
| Water |
X
Parts |
| TOTAL |
1000
Parts |
Dyed Pad-->Print(Discharage Printing Paste)-->Dry
at (80-90°C)-->Steam for 5-10 min-->Wash
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