This document provides an overview of the dyeing process used in the textile industry. It defines dye as a complex compound that is applied to textile materials to represent color. The dyeing process involves changing textiles physically or chemically to produce a uniform color. The objectives of dyeing are to color textiles uniformly, increase attractiveness, and make fabrics suitable for various uses and decorative purposes. Dyes are classified by their physical form, application method, and chemical composition. Some common dyes mentioned are acid dyes, vat dyes, basic dyes, direct dyes, and reactive dyes. The dyeing process involves several steps like desizing, scouring, bleaching, and includes the use of

1. Shyamoli Textile Engineering College

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3. DYEING

4. What is Dyeing?

5. Dye:
The dye is a complex compound which is applied
in textile materials represent color and contains
chromophore and auxo-chrome groups in it’s
Chemical structure.

6. The process by which a textile materials is to be
changed physically or chemically, so that it looks
mono uniform colored, is called dyeing.
Dyeing:

7. Objectives:
 The textile goods are dyed uniformly with
single color.
 To increase the attractiveness of the textile
goods.
 To make the fabric suitable for various usage.
 To make the textile goods suitable for
decorative.

8. Classification of dyes:
1. Physical form
2. Application form
3. Chemical form

9. Introduction to Some dyes

10. Acid dyes:
An acid dye is a dye that is typically applied to a
Textile at low pH. They are mainly used to dye wool,
not cotton fabrics. Some acid dyes are used as food
colorants.

11. Vat dyes:
A water insoluble dye, usually containing keto groups,
which is normally applied to the fiber from an alkaline
aqueous solution of the reduced enol form, which is
Subsequently oxidized in the fiber to the insoluble
form.

12. Basic dyes:
A cationic dye characteristics by its substantivity for
standard acrylic, modacrylic and basic dyeable
polyester fibers.

13. Direct dyes:
An anionic dye having substantivity for cellulosic
fibers, normally applied from an aqueous dye bath
containing an electrolyte.

14. Reactive dye
Disperse dye
Sulphure dye
Azoic dye

15. Flow chart of Dyeing process:
Grey cloth Desizing &
Singeing
Scouring &
Bleaching
Mercerizing
StenteringWashingDryingWinding
Printing Finishing

16. MACHINERIES

17. Fig: Gas Singing m/c Fig: Scouring Bleaching m/c
Fig: Mercerize m/c Fig: Rotary Printing M/C

18. Fig: Jigger M/C Fig: Pad Steam
Fig: Senter Machine Fig: Sanforizing M/C

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