Colour Chronicle - Sept 2012 - Clariant

textile
Orange and scarlet shades
Golden Yellow HF-CD
Scarlet HF-3G
Red HF-3B
What are the main problems faced by the
continuous dyer?
Shade transfer from lab to production.
Shade reproducibility from batch to
batch in production.
Meeting modern retailer and brand
house fastness requirements.
Shade reproducibility from batch to batch
in production.
What are the main issues faced by the
continuous dyer?
Fabric appearance, penetration and
levelling.
Dyestuff solubility.
Face to back shade variation (emerized
fabrics).
Shade continuity along the length and
width of the fabric (tailing/listing).
Dyestuff migration during pre-drying.
Dyestuff stability to alkaline hydrolysis.
Washing off and wet fastness.
Photochromism.
Fastness properties of the individual
dyestuff.
Improving fabric appearance, penetration
and levelling with Drimaren ® HF dyes.
Dyestuffs with high diffusion are essential
for:
Tightly woven fabrics.
Fabrics constructed from high twist
yarns.
Mercerized fabrics.
Regenerated cellulose, linen and
cellulosic blends (CO:CV, CO:FL).
Emerized fabrics (to improve face to
back shade difference).
Dyestuff stability to alkaline hydrolysis
What can be done to minimize alkaline
hydrolysis?
Automatic liquor dosing systems (ratio
4:1).
Low volume economizer trough (fast
pad liquor turnover time).
Increase the amount of sodium silicate
in the pad batch process (70 ml/l /
38°Bé).
Control of the fixation time and
temperature.
Control of the washing off conditions
(mono VS dyes sensitive to alkaline
washing).
Cooling cylinders are used to cool and
level out the fabric temperature before
padding.
Cooling water jackets around the pad
trough are used to maintain the desired
pad liquor temperature.
Process water cooling systems for
preparation of the dye and alkali
solutions.
Use reactive dyestuffs with high
alkaline stability.
Washing off reactive dyes
Excellent wash and wet fastness properties
can only be achieved by complete removal
of the hydrolyzed dye, alkali and auxiliary
chemicals during a washing off process.
Very high fixation values.
A high level of fixation is essential for
good shade reproducibility, easier washing
out of the unfixed dye and to minimize
the amount of color that passes into the
effluent.
Brill. Yellow HF-RL .................. 96%
Golden Yellow HF-CD ............... 96%
Yellow HF-CD ............................. 92%
Red HF-CD ................................. 90%
Red HF-3B .................................. 97%
Dark Red HF-CD ........................ 98%
Aquamarine HF-CD .................. 90%
Blue HF-RL ................................. 90%
Dark Blue HF-CD ....................... 93%
Royal Blue HF-CD ..................... 90%
Navy HF-GN ............................... 95%
Navy HF-B .................................. 97%
Exchange Phase 1 > Diffusion & Desorption Phase > Exchange Phase 2
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colour chronicle 3 | 2012