AKTU Chemical Processing of Textiles – III (BCT061) Syllabus PDF – B.Tech 3rd Year

Course Objectives

Objective of the course is to learn, understand, identify synthetic dyes, ecofriendly dyes, acid dyes , printing of textiles, nano finishing and colour matching computer operations and apply dyes: acid dyes, metal complex dyes, mordant dyes, printing operations like flat bed printing, rotary screen printing.

Chemistry of dyes and chemicals: Classification of dyes according to chemical constitution, features and specification, dye intermediates, manufacturing principle and ecofriendly dyes.

Acid Dyes:

Generalized formula and classification of acid dyes, Procedure for application of various types of acid dyes to wool & other fibres (e.g. Nylon & Silk) Nylon; mechanism of acid dyeing & dye fibre bond, effect of different process parameters and role of additives in acid dyeing. Fastness properties of acid dyes.

Chrome Dyes: Concept of mordants; formation of chromium complexes; Method of application of chrome dyes (i) Chrome mordant process, (ii) After Chrome process, (iii) Meta Chrome process. Brief idea on fastness properties of chrome dyes.

Metal Complex Dyes: General formula and structure, classification of metal complex dyes- 1:1 Metal complex dyes & 1:2 Metal complex dyes; Procedure of application of metal complex dyes and mechanism of dyeing fastness; Properties of metal complex dyes.

Printing paste composition. Different styles of printing e.g. Direct, Resist and Discharge, Printing process for different fibres with direct dyes, acid dyes, vat dyes, azoic colours, reactive dyes, pigments, disperse dyes etc. Brief idea on function performed by the different pigment auxiliaries/assistants used in the printing paste. Different methods of printing e.g.- screen, flat bed & rotary screen printing machineries and equipments. Common printing faults their causes and remedies.

Functional finishes Type of Nano finishes, preparation, application to textiles, self cleaning finish, UV protection, Anti bacterial nano finish, advantages and disadvantages.

Colour Theory and Evaluation Theory of colour, quantification of colours, CIE colour system colour difference, whiteness & yellowness in dyes, CIE lab formula, 555 sort. Application of spectrophotometer;

Reflectance & Transmittance: K/S Curve, Theory of computer colour matching & recipe prediction.

Reference Books

1. Wool Dyeing by D.M. Lewis
2. Chemistry of dyes and principles of dyeing by Dr. V.A. Shenai.
3. Technology of dyeing by Dr. V.A. Shenai
4. Technology of Printing by Dr . V. A. Shenai
5. An introduction to Textile Printing by W Clarke.
6. Textile Printing by L.W.C. Miles.

Course Outcomes

At the end of the course students will be able to:

1. Knowledge of fundamentals of synthetic dye chemistry, acid dyeing, printing, colour matching computer and nano finish.
2. Understanding of technological involvement with appropriate techniques in acid dyes, metal complex dyes, mordant dyes, textile printing colour matching computer and textile nano finishing.
3. Knowledge of application technique of acid dyes, metal complex dyes, mordant dyes, textile printing, colour matching computer and nano finishing process in industry.
4. Capacity to make the chemical processes under control in acid dyes, metal complex dyes, mordant dyes, textile printing, colour matching computer and textile nano finishing.
5. Understanding for doing project work and aptitude for higher studies in the field of acid dyes, metal complex dyes, mordant dyes, computer colour matching and nano finishes.