FT25403 Textile Chemical Processing – Semester IV – Fashion – R-2025

Subject Code & Name: FT25403 – Textile Chemical Processing

Regulation: R-2025

Semester: IV (Fourth Semester)

Branch: B.Tech. Fashion Technology (Fashion)

Credits / L-T-P: 4 Credits | L-T-P: 3-0-2

Course Objectives

• To enable the students to learn about pre-treatments involved in the wet processing of textiles, dyeing and printing of textiles

Full Unit-wise Syllabus

Unit I – Introduction To Chemical Processing

Operation sequence in chemical processing of cotton, silk, wool, rayon, polyester, polyamide, polyester and cellulosic blend materials with emphasis on the objectives of each operation

Unit II – Preparatory Processes

Introduction - Process sequence of wet processing for wovens and knits. Singeing electric and gas singeing. Desizing hydrolytic, oxidative and enzymatic. Scouring alkaline and enzymatic. Bleaching - hypochlorite, peroxide and sodium chlorite bleaching. Optical whitening. Mercerizing tension, tensionless and tubular mercerization. preparatory process for wool and silk.

Practical: 1. Acid/ enzymatic de-sizing of cotton fabrics and its evaluation. 2. Scouring of cotton fabrics, polyester/cotton blend and its evaluation. 3. Peroxide bleaching of cotton fabric and its evaluation. 4. Mercerization of cotton hank and its evaluation.

Unit III – Dyeing

Stages involved in dyeing process, principle of application of direct, reactive, vat, acid, disperse and natural dyes; principles of working of loose fibre, yarn and fabric processing machines.

Practical: 1. Dyeing of cotton material with different dyes – direct/ reactive/ vat and Sulphur. 2. Dyeing of polyester with disperse dye using HTHP machine. 3. Determination of colour fastness for textile materials (wash, light and rubbing ).

Unit IV – Printing

Styles of printing- direct, discharge, resist; ingredients of print paste; methods of printing; digital printing , garment printing,; special prints -flock, foam, foil, glitter, kadi, leather, pearl and rubber

Practical: 1. Develop designs with different techniques like tie-dye, clamp dyeing and shibori. 2. Printing of cotton fabric using screen and block printing technique. 3. Printing of cotton fabric using batik technique and stencils.

Unit V – Finishing

Printing methods and styles of printing; general constitution of printing paste, printing with pigments, principles of transfer and ink-jet printing, dyeing and printing faults, assessment of fastness properties of dyed and printed goods ; garment dyeing and washing; Finishing - Calendering, shrink proofing, antistatic finish, softening, water and flame proofing, UV protection, antimicrobial finish, resin finishing – crease recovery, wash and wear and durable press finishes; Standard methods of assessment of all the above finishes.

Practical: 1. Assessment of water repellent fabric 2. Assessment of flame retardant fabric

Unit VI – Computer Color Matching Concepts

Fundamentals of colour science, assessment of colour of dyed and printed goods; basics of colour matching technique; assessment of whiteness and yellowness indices and colour difference; pass/fail decision making; Eco friendly chemical processes, banned dyes and chemicals.

Practical: 1. Determination of whiteness and yellowness index 2. Determination of color parameters in fabric using spectrophotometer 3. Printing of cotton fabric using batik technique and stencils.

Course Outcomes (COs)

• CO1: Understand the preparatory processes involved in textile chemical processing and their significance in fabric preparation.
• CO2: Apply knowledge of dye classes, dyeing machines, dyeing stages, and applications in textile coloration processes.
• CO3: Analyze printing ingredients, printing methods, machinery, and defects to improve print quality and production efficiency.
• CO4: Evaluate various textile finishing methods and select appropriate finishing techniques for specific end-use applications.
• CO5: Design procedures for measuring color strength and color difference to ensure quality control and product consistency in textile processing.

Assessment Pattern (Quick Note)

• Weightage: Continuous Assessment 50% | End Semester Examinations 50%
• Internal methodology: Quiz (5%), Project (15%), Assignment Programs (25%), Practical (25%), Internal Examinations (30%)

Source: Official Anna University – B.Tech. Fashion Technology R-2025 Syllabus
Last Updated: October 2026