Yarn manufacture I : Principle of Carding and Drawing

By Prof. R. Chattopadhyay   |   IIT Delhi
Learners enrolled: 337
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

INTENDED AUDIENCE : Undergraduate students of Textile Technology

Course Status : Completed
Course Type : Core
Duration : 12 weeks
Category :
  • Textile Engineering
Credit Points : 3
Level : Undergraduate
Start Date : 26 Jul 2021
End Date : 15 Oct 2021
Enrollment Ends : 09 Aug 2021
Exam Date : 23 Oct 2021 IST

Note: This exam date is subjected to change based on seat availability. You can check final exam date on your hall ticket.

Page Visits

Course layout

Week 1 :Impurities in cotton, Opening and Cleaning principles, Layout of machines in blow room

Week 2 :Working principle and design features of opening , mixing and cleaning machines.

Week 3 :Tuft transportation, flow regulation

Week 4 :Lap formation, performance evaluation

Week 5
 :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 6 :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 7 :Motion transfer in card, draft and production calculations, card setting, significance of setting,

Week 8 :Card clothing: licker-in, cylinder ,doffer clothing; card tooth geometry, Operational load on cylinder , fibre transfer efficiency, carding process,

Week 9 :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 10 :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 11 :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 12 :Drawing process and its influence on fibre configuration in sliver, Draft and production calculation

Books and references

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.

Instructor bio

Prof. R. Chattopadhyay

IIT Delhi
Prof. R Chattopadhyay, is working as professor in the department of Textile Technology, IIT Delhi, India. He has been teaching in the department for last thirty years and has keen interest in yarn manufacturing processes, mechanics of yarn structure, process control, application of statistics in textile industry and textile product design.

Course certificate

The course is free to enroll and learn from. But if you want a certificate, you have to register and write the proctored exam conducted by us in person at any of the designated exam centres.
The exam is optional for a fee of Rs 1000/- (Rupees one thousand only).
Date and Time of Exams: 23 October 2021 Morning session 9am to 12 noon; Afternoon Session 2pm to 5pm.
Registration url: Announcements will be made when the registration form is open for registrations.
The online registration form has to be filled and the certification exam fee needs to be paid. More details will be made available when the exam registration form is published. If there are any changes, it will be mentioned then.
Please check the form for more details on the cities where the exams will be held, the conditions you agree to when you fill the form etc.


Average assignment score = 25% of average of best 8 assignments out of the total 12 assignments given in the course.
Exam score = 75% of the proctored certification exam score out of 100

Final score = Average assignment score + Exam score

YOU WILL BE ELIGIBLE FOR A CERTIFICATE ONLY IF AVERAGE ASSIGNMENT SCORE >=10/25 AND EXAM SCORE >= 30/75. If one of the 2 criteria is not met, you will not get the certificate even if the Final score >= 40/100.

Certificate will have your name, photograph and the score in the final exam with the breakup.It will have the logos of NPTEL and IIT Madras .It will be e-verifiable at nptel.ac.in/noc.

Only the e-certificate will be made available. Hard copies will not be dispatched.

Once again, thanks for your interest in our online courses and certification. Happy learning.

- NPTEL team

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