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Preparation of
Goods for Dyeing : |
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Cotton goods before dyeing must be evenly
desized, scoured and bleached (perferably
marcerised) to obtain
best results. Before dyeing, goods should be absolutely free
from alkali. To ensure, give a treatment with dilute Acetic acid
(0.5 part / litre) to prevent premature fixation of dye. |
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Chromaryle 'M' Brand Dyes : |
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These are dyed under cold conditions as they
possess high substantivity / reactivity. They are generally
employed by exhaust application. |
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Chromaryle 'H' Brand Dyes : |
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These are less reactive / substantive and hence
are generally applied by continuous methods except Turq. Blues.
Exhaust dyeing is carried at a higher
temperature i.e. around 80-90° C. They possess better fastness
than 'M' Brand dyes. |
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Chromazol Vinyl Sulphone Dyes : |
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These are generally employed by
semi continuous methods i.e. pad-batch process, although Black B,
Turq. Blue G,
can be economically used under long liquor dyeing as for knitwears. |
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Chromarly 'HE' Sulphone Dyes : |
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These are specially made for Exhaust dyeing
under long liquor rations. They are less sensitive to Glauber's
salt concentration, time and temperature. Dyeing produced are
level and fastness characteristics are better when compared to 'M'
Brand reactive dyes. These are largely employed for dyeing
knitwear and cellulose blended fabrics. Exhaust dyeing is carried
out in similar way as for Hot Brands. Reactive 'HE' dyes,
possessing considerably higher exhaustion and fixation properties
contribute to appreciable cost reduction. Due to higher fixation
of these dyes, the drained and washed liquor after dyeing contain
much less quantity of unfixed dyes thereby minimizing water
pollution. |
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Chromarly 'ME' Brand Dyes : |
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These are low temperature high exhaust dyes
with higher grade of allround fastness properties including
perspiration, light, chlorine and washing. These dyes have also
and advantage of high degree of exhaustion and fixation rates,
better alkali stability and levelling properties. As these dyes
react with cellulosic fibres at low temperature and can also be
applied cold pad-batch methods, hence these dyes are real energy
saving dyes. Thase dyes can be applied at low temperature at 60°
C with addition of 50 gm / l Glauber's salt and 20 gm / l ash. |
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Dyeing Methods for 'M', 'ME', 'H' and 'HE' Dyes : |
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1 |
Exhaust Methods : |
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Dyebath is set at 30-35° C with Glauber's salt
or common salt. Enter the goods, run for 10 minutes. Add the
dissolved dye and run for 1/2 hours. Finally add the dissolved
Alkali and raise the temperature (30-40° C for Cold Brands,
80-90° C for Hot Brands). Finally goods are washed off. |
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SALT & ALKALI REQUIREMENT |
| Depth of Shades |
Salt g/l |
Soda Ash 1:5 |
M.L.R 1:10 |
1:20 |
| 'M' Brand |
Pale |
30 |
5 |
5 |
3 |
| Deep |
60 |
20 |
15 |
10 |
| 'H'
and 'HE' Brand |
Pale |
40 |
20 gms/litre Soda Ash except for jigger
dyeing where 2.5 gms/litre Caustic Soda is used. |
| Deep |
100 |
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2 |
Pad batch Process : |
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Material is padded in dyestuff solution containing
alkali and wetting agent and if necessary Glabour's salt and batch should
be well covered with polythene paper to avoid drying. |
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'M' Brand Short
(2 hours Batch) |
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5-30 g / l Soda Ash (Equal to weight of
dye and 2 g / l wetting agent) |
| 'M' Brand |
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< 30 g / l dye - 4:1
Soda-bicarb/Soda
Ash.
> 30 gm / lit. dye - 2:1 Soda Bicarb/Soda Ash.
Total Alkali should be equal to weight of dyestuff (5-30 g / l).
+ 2 g / l wetting agent. |
'H' Brands
24 hours bath |
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5-15 g/ l caustic flakes + 30 g / l
Glauber's salt + 2 g /l wetting agent. |
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Dyeing Method for Vinyl Sulphone Dyes : |
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1 |
Exhaust Dyeing : |
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Dyeing is generally carried our with 15 gms /
Litre Trisodium phosphate as alkali. The Dyeing is started in cold
with 40-50 gm / L Glauber's salt, at 40° C. The temperature
raised to 60-80° C and alkali added. Dyeing further continued for
1 hour and goods rinsed and soaped. |
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2 |
Pad-Batch Method : |
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| Dyestuff |
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X Gms/Litre |
| Urea |
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50-100 Gms/Litre |
| Sodium Silicate 140° w |
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100 Gms/Litre |
| Caustic Soda 72° Tw |
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5 Gms/Litre for deep shades only. |
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The padded goods are batched for 24 hours and
soaped. |
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3 |
Pattern Illustration : |
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The patterns illustrated are dyed by exhaust
dyeing method on mercerised cotton for 'M', 'ME' and 'HE' brand
reactive dyes and by pad batch method for 'H' brand reactive dyes
and Vinyl Sulphone dyes. |
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Abbreviation : |
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| Light |
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1 to 8 in increasing order |
| Washing |
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1 to 5 in increasing order |
| Dischargeability |
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G-God; F-Fair; P-Poor |
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(Without Guarantee) |
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