Dyeing

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Cotton being dyed manually in contemporary India.

Dyeing is the process of changing the colour of a yarn or cloth by treatment with a dye.

1 Dye types
2 Methods
- 2.1 Direct application
- 2.2 Yarn dyeing
3 Removal of dyes
4 See also

[edit] Dye types

For the majority of the thousands of years in which dyeing has been used by humans to decorate clothing, or fabrics for other uses, the primary source of dye has been nature, with the dyestuff being extracted from animals or plants. In the last two centuries, humans have produced artificial dyes to achieve specific colours, and to render the dyes 'fast', so that they do not run when the material is washed. Different dyes are used for different type of yarn based on its raw material. such as cotton yarn mostly dyed with reactive dyes and acrylic yarn is dyed with basic dyes, nylon yarn is dyed with acid dyes, polyester yarn is dyed with disperse dyes

[edit] Methods

Dyes are applied to material by direct application, or by immersing the yarn or cloth in the liquid dye or a solution of the dye. Yarn dyeing is the coloration of yarn with a suitable dye.

[edit] Direct application

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[edit] Yarn dyeing

There are many forms of yarn dyeing. Common forms are -at package form & at hanks form. Cotton yarns are mostly dyed at package form, and acrylic or wool yarn are dyed at hank form

The common dyeing process of cotton yarn with reactive dyes at package form is given below in short- firstly the raw yarn is wonded on spring tube to achieve package suitable for dye penetration. then, these softed packages are loaded on a dyeing carrier's spindle one on other. then, the packages are pressed up to a desired height to achieve suitable density of pkg. then, the carrier is loaded on dyeing machine and yarn is dyed. after dyeing, the packages are unloaded from the carrier in to a trolly. then, all the packages are hydro extracted to remove maximum amount of water. then, all the packages are dried to achieve the final dyed package. at last the dyed yarn packages are packed and delivered.