Industrial applications of reactive dyes -
Explanation -
(1) Exhaust dyeing -
It is the same as explained in the previous part.
(Link - https://www.dspattextile.com/2022/07/reactive-dyeing-method-high-exhaust.html#more)
(2) Pad-batch Dyeing -
In this process, dye and alkali are padded onto the fabric which is then rolled up(batched) on a perforated or non-perforated beam then covered with waterproof material to forestall evaporation and stored by slowly rotating the rolls to avoid local seepage of dye liquor.
After batching for the requisite time loose dye is removed by rinsing and Soaping at a boil in the normal way. Depending on storage temperature two sequences are employed.
(i) cold batching
(ii) hot batching
Explanation -
(i) Cold batching -
This has the advantages of easy equipment use, high output, high fixation efficiency, and outstanding dyeing quality.
It can be used for any length of run and is appropriate for all shades of shade. It is also a very effective substitute for the pad jig approach. In the graphic below, a typical cold batch sequence is displayed.
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| Pad(alkali) batch (cold) method |
(ii) Hot batching :
This process involves padding the material with the dye and alkali, passing it through infrared heaters to preheat it to 50 to 95°C, and then bundling it on a large roller in an exceedingly hot chamber.
to make sure that the dye diffuses and fixes on the fibre, batching is meted out in an exceedingly regulated environment with relevant temperature and humidity.
It's required to feature common salt or Glauber's salt to maximise fixation and minimise migration during hot batching. because of their high Substantivity and risk of tailing, particularly when salt is present, reactive HE dyes don't seem to be frequently utilised by padding methods. within the graphic below, a hot batch sequence is displayed. -
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| Pad (Alkali)-batch(hot) method |
Questions -
- What are the Industrial applications of reactive dyes?
- Describe the Exhaust dyeing process for reactive dyes.
References
Ahmed, S. (2014, September 29). Reactive dyes - classification. TextileTuts. https://textiletuts.com/reactive-dyes/
Chakraborty, J. N. (2010). Waste-water problem in textile industry. In Fundamentals and Practices in Colouration of Textiles (pp. 381–408). Elsevier.
Clark, M. (2011). Handbook of textile and industrial dyeing: Principles, processes and types of dyes (Matthew Clark, Ed.). Woodhead Publishing.
No title. (n.d.). Acs.org. from https://cen.acs.org/articles/96/i29/new-textile-dyeing-methods-make.html
Patwary, E. M. Z. (2012, February 18). Reactive dyes. Textile Fashion Study; Engr. Mohammad Zillane Patwary. https://textilefashionstudy.com/reactive-dyes-definition-classification-properties-and-influencing-factors/
Sayed, A. (n.d.). Why reactive dye is so called? Blogspot.com. from https://textileapex.blogspot.com/2013/11/reactive-dye.html
(N.d.). Textilelearner.net. from https://textilelearner.net/reactive-dyes-classification-dyeing-mechanism/
What are Reactive Dyes? Types of Reactive Dyes. (n.d.). Meghmaniglobal.com. from https://www.meghmaniglobal.com/what-are-reactive-dyes-types-of-reactive-dyes/
Continue reading,
Part 2 Classification of Reactive dyes
Part 3 The reaction of MCT and DCT of reactive dyes
Part 4 General Factors affecting the results of reactive dyeing
Part 5 Reactive dyeing method - DCT
Part 6 Bifunctional systems of reactive dyes
Part 7 Development of reactive dyes
Part 8 Reactive dyes on Silk and nylon with their application
Part 9 Industrial applications of reactive dyes
Part 10 After treatment of reactive dyes
Writer - Rushikesh Patil (Textile Engineer)
