Kolorjet Chemicals Pvt Ltd. - Buyers Guide to Dyes

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Kolorjet is one of the leaders among manufacturers and suppliers of a comprehensive range of quality dyestuffs, colors and chemicals for different industrial requirements. Our range of products include dyestuff, inkjetdyes, dyes for wax printing, textile auxiliaries, synthetic food colors, natural food colors, pigments, food ingredients, dyes intermediaries, fine chemicals, specialty chemicals, enzymes, optical brighteners and soap wax dies. An ISO 9001:2008 certified company, Kolorjet continues continues to play a leading role in the manufacturing of dyestuffs in India with the intent to further strengthen its position for its quality products. With our decades of experience and extensive industry knowledge, we have been able to face the challenges of the global market place and deliver quality products in adherence with market standards and parameters. Whatever be your specification or quantity desired, our expertise and quality of service always remains the same. Modern production and techniques and flexible processes and procedures allow us to offer efficient service for small batch as well as large orders. Kolorjet is a customer oriented company and work with the objective of achieving maximum customer satisfaction. The company has adopted innovative procedures and practices to meet customer expectations every time they deal with us. We always welcome any feedback or suggestions from clients in order to serve them better.

Buyers Guide to Dyes

Dyeing is a very critical process and ensuring the quality of dye is also very critical. The warm and moist conditions are also an important factor that should be considered while dyeing any product.

Listed below are some of the parameters and questions that a dye manager must consider before opting for any dyeing process.

Is the process compatible with all the dyes he has opted 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 chosen or not

Common Dyeing Problems
A Dyer encounters a lot of problems while dyeing the products. Here in this page a few of such common dyeing problems as faced by the dyer are discussed along with solutions.
Common Dyeing Problems Solutions Unstable dye dispersion

Select dyes that has better dispersion stability
Application of efficient dispersant

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 dye bath

Selection of dyes very carefully, exact control of pH
Giving attention to stability of dye with respect to electrolytes

Presence of Precipitates in the dye bath

Causes can include crystallization of dyes due to changes in temperature in the dye bath
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 Bi-functional 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.

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