DYEING AND PRINTING

Paper Code: 
HCT 421
Credits: 
4
Contact Hours: 
45.00
Max. Marks: 
100.00
Objective: 
  1. To impart the knowledge on concept of color
  2. To impart the knowledge about preparation of fabric for dyeing & printing.
  3. To understand the theory of dyeing in relation to various classes of dyes.
  4. To study application of various dyes and properties related to it.
  5. To inculcate awareness of the different methods of printing and appreciate the technical advantages of each.
  6. To develop technical competency in printing with different dyes on different fabrics.

 

13.00
Unit I: 
Dyeing:
Preparation of Fabric:                                            
  • Pretreatments of fabric for Dyeing and Printing – scouring, bleaching, singeing, desizing.
  • Specific preparatory steps for cotton, wool, silk and man-made fibres.

 

 

12.00
Unit II: 
Dyeing Mechanism:
  • Dye, classification of dyes, chemcial constitution of dyes
  • Theory of dyeing
  • Dyeing with synthetic dyes.

         i) Direct, vat, reactive sulphur, Azo (for cellulosic)

         ii) Acid, basic (for proteins)

  • Stages of dyeing – fibre dyeing, yarn dyeing, fabric dyeing, garment dyeing, their advantages and disadvantages.
  • Union dyeing and cross dyeing.
  • Dyeing defects and remedies.

 

12.00
Unit III: 
Color
  • Introduction of color – Color & Color mixing
  • Color Perception
  • Instruments for measurements of colour
  • Defective colour vision
10.00
Unit IV: 
Printing:
  • Introduction to Printing, difference between dyeing and printing.
  • Historical development of Printing methods – block, screen, stencil, roller and rotary.
  • Preparation of printing paste – Thickening agents and their suitability for various classes of dyes and fibres
13.00
Unit V: 
Printing Procedure:
  • Styles of Printing – Direct, resist, discharge.
  • Special Printing Procedures – Transfer Printing, Flock Printing, Foam Printing, Damask Printing
Essential Readings: 
  1. Shenai, V.A ., (1987) Chemistry of Dyes and Principles of Dyeing, Sevak Prakashan, Mumbai.
  2. Prayag, R.S., Technology Textile Printing, Noyes Data Corporation.

 

 

References: 
  1. Lubs, H.A. &  E. Robert., The Chemistry of Synthetic Dyes and Pigments, Kreiger Publishing Company, New York.
  2. Shenai, V.A., (1999) Azo Dyes- Facts & Figures, Sevak Prakashan, Mumbai.
  3. Shenai, V.A., (1977) Technology of Printing, Technology of Textile Processing, Vol. IV, Sevak Publications.
  4. Gulrajani, M.L. and Gupta Deepti., (1990) Natural Dyes and their Application to Textiles, ed  .,I.T Delhi Publication.
  5. John & Margarot, Cannon., (1994) Dye Plants & Dyeing, The Herbert Press, UK.
  6. 8.   Venkatraman, K., (1970) Chemistry of Synthetic Dyes, Part I and Part II.

 

 

 

Academic Year: 
2017-2018
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