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 |
 SULPHUR
DYES COLOUR CHART |
Name
of Colour |
Colour
Sample
|
2
% |
4
% |
| Yellow
GC |
|
|
| Yellow
GR |
|
|
| Brilliant
Yellow GD |
|
|
| Orange
NR |
|
|
| Khaki
SND |
|
|
| Khaki
NVS |
|
|
| Golden
Khaki |
|
|
| Dust
Khaki |
|
|
| Mill.
Green MPS |
|
|
| Mill.
Green GM-100 |
|
|
| Mehandi
Green MP |
|
|
| Olive
Green 6020 |
|
|
| Blue
NCMP |
|
|
| Blue
MPSG |
|
|
| Blue
MRJ N |
|
|
| Ultra
Marine Blue 75 |
|
|
| Bottle
Green 5043 |
|
|
| Bottle
Green No. 7 |
|
|
| Green
FB/Cons. |
|
|
| Green
FF |
|
|
| Peacock
Blue 588 |
|
|
| Peacock
Blue BHMP |
|
|
| Peacock
Blue 55 |
|
|
| Peacock
Blue SR |
|
|
| Bordiex
3BMP Bordeaux |
|
|
| Bordiex
29 Bordeaux |
|
|
| Coffee
Brown BL 501 |
|
|
| Dark
Brown HR-4 |
|
|
| Voilet
Brown 760 |
|
|
| Voilet
Brown GMR |
|
|
| Calf
Brown 240 |
|
|
| Red
Brown 360 |
|
|
| Maroon
YMP |
|
|
| Grey
No. 22 |
|
|
| Grey
2R/Cons. |
|
|
| Grey
No. 905 |
|
|
| Grey
3B |
|
|
| Ink
Blue 815 |
|
|
For more info write to
info@fabricareorganics.com
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|
 SULPHUR
DYES
Sulphur Dyes produce full colour range,
offertechnical advantage in dyeing are available
at moderate rate & relatively good colour fastness.
Sulphur dyes are mainly employed for dyeing of cotton,
linen, viscos rayon & celulosic component of
polyester celulosic blends.
To produce optimum results as are brightness, depth
& fastness. It is essential that proper prcautions
are taken while dyeing as : |
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- - - - - - - - - - - - - - - - - - - - - - -
- - - - - |
 DYEING
METHODS
»» Dyeing
Temperature
Sulphur liquids are found highly substantive
and dye best at room temperature. Temperature of
50 - 60 degrees may be employed when dyeing liquids
by pad-jig or pad-steam when faced with the problem
of tailing.
»» Water
The use of soft water or purified water
is preferred but in cases where hard water is only
available, a sequestering agent based on sodium
hexa-meta-phosphate, ethylene amine tetra acetic
acid or ethylene di-armine tetra carbonic acid should
be used.
»»
Oxidation
Chemical oxidation after treatments are
used after dyeing and rinsing to convert the reduced
sulphur dyes back to their original insoluble form
on the material to give a stable shade and improved
fastness properties compared with simple air oxidation.
»»
Wetting Agents
Wetting agents compatible with sulphur
dyes must be used. The recommended wetting agents
are Sulfaid Penetrant IX, which is stable in alkaline
leuco baths and padding liquors.
»»
Soaping
Soaping removes loose dyes from the surface
of the material and more importantly develops the
full shade and fastness properties of the dyeing
by increasing the crystallization of the dye in
the fibre.
»»
Resin Finishes
Sulphur dyes fabric may show some change
in shade when finished with cease resisiting durable
press resins. This shade change is often due to
acidity or metal salt of the catalyst.
»»
Dark Selvedges
An uneven jig roll is primarily the cause
of this trouble. Addition of sequestering agent
to the dyebath is desirable.
»»
Washing
A complete and thorough washing before
oxidation is of utmost importance in sulphur dyeing.
»»
Pad Box Level
Pad box level in continous dyeing is very
critical. If dyebath level varies so will the shades.
»»
Tensile Strength
Through washing before and after oxidation
and keeping the pH of the finished cloth or yarn
slightly alkaline will prevent any loss in tensile
strength.
»»
Fabric preparation
sulphur dyes can also be applied on grey
fabric provided polyvinyl alchol is not used in
sizing.
»»
Mercerizing
Mercerizing improves color yield of sulphur
dyes by 30-40% over un-mercerized goods.
»»
Polysulfides
Polysulfides, rising and soaping can contribute
to achieving dyeing free from bronziness.
»»
Chelating Agents
If water has too high levels of calcium
or magnesium, hardness, suitable sequestering agents
must be used to lower the hardness.
»»
Electrolyte
It is a standard practice to add electrolyte
to the dyebath usually sodium chloride or sulphate
to promote dye uptake. |
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