Courses » Yarn manufacture I : Principle of Carding and Drawing

Yarn manufacture I : Principle of Carding and Drawing


Carding and drawing are two fundamental process in yarn manufacture. Incarding the fibre tufts are opened , cleaned and separated thoroughly by fast moving pinned surfaces and then reassembled to form a nice 2D array of fibres which is subsequently transformed into an uniform sliver. Drawframe is essentially a stretching device for sliver used to improve mass irregularity of sliver and parallelization of fibres

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Dr. R. Chattopadhyay is Professor at the Department of Textile Technology, Indian Institute of Technology IIT Delhi. He is also an alumnus of this institute. He is involved in teaching, research, consultancy and organising courses for industry and academia. His area of expertise is staple fibre spinning, quality & process control , industrial ropes and product design. He has guided 8 doctoral and 52 master thesis and has about 75 research papers in national and international Journals. He is member of The Textile Institute UK and The Institution of Engineers, India. He is member of International Advisory Board for Journal of Textile Engineering, Japan and Chairman Consulting editor for the Journal of Institution of Engineers. He is a regular reviewer of papers published in Journal of Textile Institute (UK), Textile Research Journal (USA), Indian Journal for Fibre and Textile Research. His current research interest are Structure - property - performance relationship in yarns, ropes and cordages, Textile product design and pressure garments.


Week 1  :  Objectives of carding process, carding actions , working principle of carding machine, Card feed system, lap and continuous feed systems, design feature of taker-in/ licker-in, waste extraction, opening Intensity
Week 2  :   Design feature of cylinder section, construction , design and working of flats, analysis of carding theory , carding force, fibre shedding, Transfer of fibres from cylinder to doffer, Technological significance of doffing arc, doffing of web , web condensation, Package formation: Forms of packaging, coiling, analysis of can drive
Week 3  : Motion transfer in card, draft and production calculations, card setting, significance of setting,
Week 4  :  Card clothing: licker-in, cylinder ,doffer clothing; card tooth geometry, Operational load on cylinder , fibre transfer efficiency, carding process,
Week 5  :  Autoleveller in card: principle of autolevelling, type of autoleveller, type of autoleveller, correction length, Fibre configuration in card sliver, mechanism of fibre hook and nep formation, cloudy web, Drawframe: Fundamentals of drafting, draft , ideal drafting, geometrical analysis of fibre movement in drafting
Week 6  :  Objectives of drawing, Design features and working mechanism of drawframe. Drafting unit, drawing rollers, Drafting roller arrangement and its significance , package formation, Autoleveller in drawframe, Sliver irregularity and its control
Week 7  :  Theory of drafting, Vasileff’s model of drafting, drafting wave, Drafting force , draft vs drafting force, Roller setting: analysis of roller setting, influence of roller setting
Week 8  :  Drawing process and its influence on fibre configuration in sliver, Draft and production calculation 


1. Fundamentals of spun yarn Technology, C. A. Lawrence, CRC Press, 2003.
2. Manual of Textile Technology, Volumes 1-3, W. Klein, The Textile Institute, Manchester, 1993.
3. The Economics, Science and Technology of Yarn Production, P. R. Lord, School of Textiles, NC State University, USA, 1981.
4. The Institute Series on Textile Processing. Volume : Opening, Cleaning, and Picking, Zoltan S. Szaloki, Institute of Textile Technology, Charlottesville, Virginia, 1976.
5. Technology of Carding, R. Chattopadhyay, NCUTE Publication, Ministry of Textiles, Govt. Of India, 2003.
6. Spun Yarn Technology, Butterworths, London, 1987.
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  • Date and Time of Exam: October 7, 2018 (Sunday)
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