Principles of Combing,Roving preparation & Ring spinning

By Prof. R. Chattopadhyay   |   IIT Delhi
Learners enrolled: 465
The course will focus on three processes i.e. combing , roving preparation and ring spinning. The construction , design features and working principles of the machines will be looked into. The role of machine and process parameters on process performance will be explained. The interaction between technology and machine design will be discussed. Emphasis will be on “know why” rather than “know how”.

INTENDED AUDIENCE: Undergraduate students of Textile Technology

Course Status : Completed
Course Type : Core
Duration : 12 weeks
Start Date : 14 Sep 2020
End Date : 04 Dec 2020
Exam Date : 20 Dec 2020 IST
Enrollment Ends : 25 Sep 2020
Category :
  • Textile Engineering
Credit Points : 3
Level : Undergraduate

Page Visits

Course layout

Week 1: Flow chart of combed spinning process, objectives of combing , consequence of short fibres in cotton , segregation principle
               of short fibres from longer ones, Combing operations and its classification, sequence of operation, Timing diagram
Week 2: Pre-combing operation, Comber lap formation, Design features and working principle sliver lap & ribbon lap machines, Draft 
                and its influence on lap quality. Structure and design feature of combing machine. Working principle , Design features of combing
                machine elements ( lap feed roller, cylinder comb, top comb, nipper assembly, detaching roller, sliver table, 
                drafting rollers, coiling arrangement)
Week 3:  Mechanism for lap feed, nipper assembly movement, detaching roller movement, and cylinder comb Web structure , condensation,
             sliver guidance & drafting process
Week 4: Theory of noil extraction fro forward and backward feed machines, Influence of process parameters on combing efficiency Production 
and draft calculation        
Week 5: Objects of roving frame, Machine configuration, working principle Drafting system, drafting elements (cradle, aprons, condenser etc.)
Week 6: Flyer construction, presser , twisting , flyer top , twist diameter count relationship Bobbin geometry , Operation for bobbin building, 
Winding process, winding equation, Bobbin leading vs flyer leading frame
Week 7: Variable speed drive, Differential gear Building motion: function and working
Week 8: Drive analysis, motion flow,Ring frame : machine configuration, various components, working principle
Week 9: Drafting, Drafting elements, drafting angle, Difference between speed frame and ring frame drafting system, break draft and main draft 
distribution Twisting and winding principle, twisting winding equation, twist flow, winding tension
Week 10: Bobbin building : bobbin geometry, Nature of ring rail movement, winding and binding layer, Formation of base and conical bottom. Ring 
and traveler: types , purpose, traveler number
Week 11: Spindle : construction, drive, Spinning geometry, spatial location of elements
Week 12: Balloon mechanics, Tension in balloon yarn, balloon size, End breaks, non uniformity, causes & remedies

Books and references

1. Fundamentals of spun yarn Technology, C. A. Lawrence, CRC Press, 2003. 
2. Manual of Textile Technology, Volumes 3&4, 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. Manual cotton spinning , The principle and theory of ring spinning, The Textile Institute and Butterworth & Co. Ltd. UK 1965 
5.Yarn Production: Theoretical Aspects, P Gross berg & C Iype, The Textile Institute , Manchester, UK 1999 
6. Advances in Technology of Yarn Production, Ed. R Chattopadhyay, NCUTE Publication, Ministry of Textile, Govt. of India 2002 7. Spun Yarn Technology, E. Oxtoby, 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: 20 December 2020 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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