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Buyer's Guide
For making the colorfull fabric dyeing is must necessary for good qualities and recomendation.Dyeing is a very critical process. In this competitive market reliable, cost-effective products and latest technological solutions are essential for survival. A lot of factors go in making the dyeing process the right one that not only saves capital for the dyer but takes care of the environmental problems associated with dyeing as well.
 
some of the parameters and questions that a dye manager must consider before opting for any dyeing process are listed bellow
  • Is the process compatible with all the dyes he has opoted for
  • If the process is exactly compatible with the machine with respect to temperature, pH, and material construction and that there is adequate control of these necessary parameters.
  • The chosen dye gives all the fastness requirements as specified.
  • Correct dye bath is choosen or not



INHABITORS IN DYEING PROCESS

INHABITORS Solutions
Unstable dye dispersion
  • Select dyes that has better dispersion stability
  • Application of efficient dispersants
Incorrect dyeing program The answer lies in optimization of dyeing process. Which means adjustment of the process parameters in a manner so that the entire operation takes place in the shortest possible time. It should not exceed the tolerance limits with respect to reproducibility and levelness.

This effectively means quick heating in the temperature ranges where the dye exhausts slowly or is already exhausted. Controlled heating as the dye starts showing a particularly high rate of exhaustion.
Poor light fastness Causes are:
  • Traces of carrier residues on fabric
  • Staining of adjacent fibre
  • Catalytic fading because of unsuitable dye combination
  • Repeat thermofixation (at high temperature)
  • Selection of appropriate dyes
  • Adjustment of dye selection
Pale areas found after dyeing is over
  • Proper ventilation of vapours and gases
  • Avoidance of contact with dangerous substances
Deviations in shades of dyeing
causes can be-
  • Sensitivity of dyes to hydrolysis, reduction, electrolyte
  • Sensitivity of dyes to metal ions in the dyebath
  • Selection of dyes very carefully, exact control of pH
  • Giving attention to stability of dye with respect to electrolytes
Presence of Precipitates in the dyebath
  • Causes can include crystallization of dyes due to changes in temperature in the dyebath
  • Usage of volatile carriers
  • Using systems that has perfect liquor circulation
  • Selection of suitable carriers, usage of overhead heating in the machine
Poor dye fixation
  • This has been a common problem particularly with reactive dyeing when it comes to batch dyeing of cellulose fibres. This can be taken care of by the use of sophisticated molecular engineering techniques. Use of Bifunctional and low-salt reactive dyes can attain more than 95% fixation rate even for cellulosic fibres.
  • Application of hot rinsing methods
System losses in continuous dyeing processes
  • Carrying out of the impregnation step in a nip
  • The capacity of the dip trough to be minimized.
  • Separate streams in dispensing the dyestuff and auxiliaries.


Buyer's Guide for PIGMENTS