The continuous dyeing of Cotton, Polyester &
their blends is gaining importance over the traditional exhaust dyeing process
owing to the major advantages in terms of uniformity of shades in long
yardages, high productivity, simple/ short dyeing process, low utility cost in
terms of consumption of dyes, chemicals, water, energy & low effluent
generation.
Considering the recent changes in the Indian
textile industry & the challenges faced from the global competition, the
industry is
- Moving towards Economies of
Scale with latest technology
- Stringent Product quality and
Safety standards
- Minimization of lead times of
deliveries
- Higher pressure on Price-Trend
towards high economy
- Modernisation, Automation &
Re-structuring activities
- Growing importance of Brands and
Retailers
- Fast changing consumer tastes
- Increasing technical support
requirements by the user industry
Depending on the type of substrate, selection of
dyestuffs, availability of machines & the processors choice, various
methods of dyeing are adopted. Effective co-ordination between a dyestuff
manufacturer, textile processor, and machinery producer has led to ongoing
improvements this continuous dyeing system
Usually for reactive dyes Cold-Pad-Batch (semi-continuous),
Pad-Dry-Steam, Pad-Humidifix or Pad-Dry-Pad-Steam process is used, In case of
Vat dyes Pad-Dry-Pad-Steam or Pad-Dry-Cure is preferred, whereas in case of
Disperse dyes Pad-Dry-Thermosol process is followed.
SDC (Symptoms, Diagnosis & Curing)
Concept in continuous dyeing
Considering the importance of this emerging
trend of continuous dyeing & the general problems faced by the textile
processor, we feel the SDC concept would be helpful. However, in order to
overcome/ minimize the processing related problems it is essential to first
understand the Symptoms (problems), Diagnose (ascertain the probable cause)
& Cure (adopting remedial measure).
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Full Article
Source: Technical Service, Atul Ltd (Colors
Division), Atul - Valsad, Gujarat, India
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