Surya Light Fast
dyes are direct non-benzedene dyestuffs,
suitable for dyeing cotton and viscose
in the form of fabric, yarn as well
as loose cotton. They are also used
for dyeing of wool, pure silk &
leather in certain cases.
The
dyestuff is pasted with cold water
dissolved by pouring 50 to 100 times
its weight of boiling water with stirring.
Surya Direct dyestuffs are dyed from
a neutral or alkaline dyebath depending
on individual dyestuffs. The dyeings
are exhausted with the addition of
Glaubers salt or common salt. The
quantities to be added are as follows:
For Light Shades
0.5%
Soda
Ash
5
- 10%
Glauber's Salt Calc.
or
common salt.
For Medium &
Dark Shades
1
- 2%
Soda
Ash
15
- 20%
Glauber's Salt Calc.
or
common salt.
The addition of soda ash to the
dyebath may be omitted while dyeing
blends containing Acetate Rayon
where the Acetate component is to
be reserved.
The dye-bath is set at 50 - 60oC
with soda ash, salt and dissolved
dyestuff. The boild out yarn is
then entered and worked for 15 minutes.
The dye-bath temperature is raised
to 90-95oC in 15 to 20
minutes. In order to overcome unlevel
dyeing, salt may be added after
about 15 minutes of initial dyeing.
For improving the fastness to washing
of Surya Direct dyestuffs, we suggest
an after treatment with dye fixing
agent. The dyed goods are treated
in a fresh bath containing 2 to
3 gms/litre Dye fixing agent for
30 minutes at pH 6-6.5 at 45oC,
The material is then rinsed and
dried.
