DYEING
PROCEDURE FOR WOOL
Method I
This
is recommended for Acid Levelling
Dyes:
|
X% |
Dye |
|
5
- 10% |
Glauber's
Salt Calc.
|
|
2
- 5% |
Sulphuric
Acid (168oTW)
or
Formic Acid (85%) |
Enter the material (without dye)
at 50oC and run for 5
minutes. Add the dissolved dye and
raise the temperature gradually
to the boil over 30 minutes and
continue dyeing at the boil for
45-60 minutes. Rinse.
Method
II
This
is recommended for acid Milling
& TPM Dyes:
|
X% |
Dye |
|
5% |
Glauber's
Salt Calc. |
|
1
- 3% |
Acetic
Acid (30%)
or
Ammonium Sulphate
or
Ammonium Acetate |
Enter the material (without dye)
at 50oC and run for about
5 minutes. Then Add the well dissolved
dyestuff and dye for 15 minutes.
Raise the temperature gradually
to the boil over 30 minutes and
continue at the boil for 45-60 minutes.
For heavy shades, if exhaustion
is not completed, add:
|
2
- 4% |
Acetic Acid (30%)
or
Formic Acid (85%)
or
|
|
1
- 2% |
Sulphuric
Acid (168oTW)
|
and
dye for further 15-30 minutes at
the boil. Rinse.
Method
III
This
is specifically recommended for
acid Navy Blue 2RNS:-
|
X% |
Dye |
|
5% |
Glauber's
Salt Calc. |
|
1
- 3% |
Acetic
Acid (30%)
or
Ammonium Sulphate
|
|
0.2
- 0.5% |
Sodium
or Potassium Dichromate
|
Enter
the yarn (without dye) at 40oC
for about 5 minutes. Then add the
dissolved dye and raise the temperature
gradually to the boil over 45 minutes
and dye further for 60 minutes at
the boil. Rinse.
Method
IV
This method
is recommended for acid 1:1 Metal
Complex Dyes.
|
X%
|
Dye |
|
5 -
10% |
Glauber's
Salt Calc. |
Enter the material for 10-15 minutes.
Add 4% Sulphuric Acid (l68oTw) and
raise the temperature gradually
to the boil. In case of medium or
deep Shades add a further quantity
of 2 - 4% Sulphuric Acid (l68oTw)
to the dyebath and continue dyeing
at the boil. The total time of the
boiling period should be at least
90 minutes. Rinse well to free all
acid and preferably neutralise all
traces of acid on the yarn with
2 cc/litre Ammonia (25%).
1:1 Metal Complex Black WA repuires
a modified method as under:-
|
X% |
Dyestuff |
|
2% |
Sulphuric
Acid (168oTW)
|
Enter the material
at 70oC and raise the
temperature to the boil. After boiling
for a short time add a further quantity
of 3% Sulphuric Acid (l68oTw)
to the dyebath and continue dyeing
at the boil. The total time of boiling
should be atleast 90 minutes. An
addition of 0.3% Sodium or Potassium
Dichromate, 30 minutes before dyeing
is completed, contributes to enhanced
depth of shade, producing a fuller
black. Finally rinse well and neutralise
all traces of acid on the yarn with
a little Ammonia as mentioned for
other 1:1 Metal Complex dyes.
Method
V
This
method is recommended for the dyeing
of Chrome Dyes:
|
X% |
Dyestuff |
|
4% |
Chromate
Mordant (prepared by mixing
one part Sodium or Potassium
chromate and two parts of
Ammonium Sulphate) |
Enter the material
at 50oC and raise the
temperature to boil within 45 minutes.
Then continue further at the boil
for 60-90 minutes. When dyeing medium
to heavy shades add for exhaustion:
|
0.5-1.0%
|
Acetic Acid (30%)
or |
|
0.25
- 0.5% |
Formic
Acid |
Method
VI
This method is recommended for the
dyeing of acid 1:2 Metal Complex
Dyes:
The dyeing method is similar to
method 1 employing,
|
2
- 3% |
Ammonium Sulphate
or
Ammonium Acetete |
No extra addition
of Acetic Acid is normally necessary.
Fastness
Properties
|
Light
Fastness : |
The rating figures are given
on the scale 1-8 i.e. 1 (minimum)
poor and 8 (maximum) outstanding.
|
|
Other
Fastness : |
The rating figures are given
on the scale 1-5 i.e. I (minimum)
poor and 5 (maximum) outstanding.
|
|
