|
Properties
| Shade Card | Dyeing
Procedur |
REACTIVE
H BRAND DYES are monochlorotriazine
reactive dyes having a low reactivity
and low substantivity. Since these dyes
have low reactivity, they require more
severe conditions for fixation with
cellulosic materials. They are readily
soluble by pouring water of 80-85oC
on powder & stirring well. They
are applicable on cellulosic materials
by both dyeing as well as printing methods.
In comparison with cold brand dyes,
the `H' brand dyes require either a
long steaming time or a high thermofixation
temperature (with urea) for optimum
fixation. H dyes of low to medium substantivity
may lead to migration problem in dyeing
prior to fixation.
When low concentration of highly substantive
dyes are used, tailing becomes evident.
Tailing is avoided by selecting dyes
of low or medium substantivity, using
small padding troughs fed to constant
level and operating at the highest running
speed commensurate with the needs of
the rest of the process
|
|
|
Yellow
M4G
|
Y.18
|
L
|
120
|
G
|
5-6
6-7
|
5
|
4-5
|
5
|
1
|
(+)
|
+
|
+
|
+
|
+
|
|
|
G.Yellow
HR
|
O.12
|
H
|
100
|
F
|
5
6
|
5
|
5
|
5
|
3
|
+
|
+
|
+
|
+
|
+
|
|
|
Orange
H2R
|
O.13
|
H
|
180
|
F
|
3-4
4-5
|
5
|
5
|
4
|
4
|
+
|
+
|
+
|
+
|
+
|
|
|
Red
H8B
|
R.31
|
H
|
100
|
P
|
3
4
|
5
|
4
|
4
|
3-4
|
+
|
+
|
+
|
+
|
+
|
|
|
Magenta
HB
|
V.13
|
M
|
100
|
P
|
3
4
|
4
|
4
|
4
|
1
|
+
|
+
|
+
|
+
|
+
|
|
|
Purple
H3R
|
V.1
|
M
|
100
|
P
|
5-6
6-7
|
5
|
3
|
3
|
4
|
+
|
+
|
+
|
+
|
+
|
|
|
Blue
H5R
|
B.13
|
L
|
100
|
P
|
5
6
|
5
|
4-5
|
5
|
1-2
|
+
|
+
|
+
|
+
|
+
|
|
|
T.
Blue H5G
|
B.25
|
H
|
80
|
P
|
4
5
|
4
|
4
|
4
|
3
|
+
|
+
|
+
|
+
|
+
|
|
|
Red
Brown H4R
|
Br.9
|
L
|
80
|
F
|
4
5
|
4
|
4
|
4
|
4
|
+
|
+
|
+
|
+
|
+
|
|
|
Black
HN
|
Bl.8
|
L
|
60
|
P
|
4-5
5
|
4-5
|
4-5
|
4-5
|
3-4
|
-
|
+
|
+
|
+
|
+
|
|
| |
| Key
to Abbreviations |
| |
| Affinity
or Substantivity on cotton |
|
| L |
= Low |
+ |
= Suitable |
| M |
= Medium |
(+) |
= Fairly
Suitable |
| H |
= High |
- |
= Not
Suitable |
| V |
= Very
High |
|
|
| Dischargeability |
: G = Good;
F = Fair;
P = Poor
|
| Light |
: 1
to 8 in increasing order |
| Washing
& other |
: 1
to 5 in increasing order |
| Y |
= Yellow |
O |
= Orange |
| R |
= Red |
V |
= Violet |
| B |
= Blue |
Br |
= Brown |
| Bl |
= Black |
G |
= Green |
|
| Top |
|
DYEING
METHODS
Though
`H' dyes are of major interest for
printing applications, a variety
of dyeing methods are used for `H'
dyes.
| i) |
Exhaust
dyeing method (Jigger Machines)
Set the dye-bath with required
amount of water at 40oC
and add half the amount
of dyestuff solution with
1-2 g/l resist salt, run
for 1 turn and add the remaining
half amount of dyestuff
solution and run for another
turn.
Then add half of the salt
and start raising the temperature
slowly. (such that 65 to
85oC temperature
could be attained after
two turns). Run for I turn
and then add the remaining
amount of the salt and give
it another turn.
Now add half the amount
of predissolved alkali and
give one turn. Temperature
is maintained at 80oC.
Add remaining half amount
of alkali and give another
three turn for better fixation
give two more turns and
then drain the jigger.
| Below
0.5% |
40
gm/l |
10
gm/l |
| 0.5
to 2.0% |
60
gm/l |
15
gm/l |
| 2.0
to 4.0% |
80
gm/l |
20
gm/l |
| Above
4.0% |
100
gm/l |
20
gm/l |
|
|
ii) |
Exhaust dyeing method (Winch
Machines) Viscose Rayon
The dye bath is set at 50oC
with 20 parts/1000 parts
resist salt and dissolved
dye solution is added and
fabric is dyes for 10 minutes.
The required amount of salt
is added and goods are dyed
for about 15 minutes. Then
soda ash is added and dyeing
is continued for further
10 minutes. The goods are
then washed.
Salt and alkali requirements
- Parts/1000 parts
| Upto
0.5% |
40
|
10
|
| 0.5
to 1.5% |
50
|
15
|
| 1.5
to 3.0% |
60
|
20
|
| Above
3.0% |
80
|
20
|
|
| iii) |
Pad-dyeing
method
`H' dyes are applicable by
this method by using padding
mangle and suitable drying
and steaming equipments as
per requirement.
(a)Pad - Dry - Bake - Wash
| |
Urea
|
200
parts |
| |
Sod.
Alginate Paste |
2
parts |
| |
| | | |
