JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• 1. To learn about the principles of Drawing
• 2. To learn about the process of Combing
• 3. To learn about the process of Simplex’
• 4. To learn about the role of break draft in machines
• 5. To learn about the ring spinning

Course Outcomes

(Graduate to have)

• 1. An ability to understand the material flow through various machines thro Draw frame and quality control aspects of product produced
• 2. An ability to understand the details of Speed frame
• 3. An ability to select the process parameters in Combers
• 4. An ability to select the DCP in Simplex based on sliver hank
• 5. An ability to test the quality of sliver at each stage and draw the conclusions
• 6. An ability to plan the number of machines for spin plan based on production

UNIT - I

Drawing: Introduction, Objectives, basic concepts of drawing (ideal draft and real draft), Study of conventional Draw frame, Principle of Roller drafting, Different drafting systems, methods of roller weighing, Roller eccentricity, Coiler mechanism, Draw frame setting, Importance of Break draft, Study of Modern Draw frame, Auto leveling in Draw frame – Production calculations. - Quality control Aspects

UNIT - II

Combing: Introduction, Objectives, Hook presentation, Hooks theory, combing preparatory machines: study of sliver lap, ribbon lap and super lap formers – Comber: passage of material, functions and setting of each part, Combing principle, cycle of combing, working of modern combers – production calculations. - Quality control Aspects

UNIT - III

Speed Frame: Principles, detailed study of mechanisms of speed frame, study of different speed frames role of various drafts, processing of cotton, synthetic and regenerated fibers, Recent Developments, production calculations – maintenance schedules. - Quality control Aspects Ring Spinning: Introduction, Passage of material, functions of parts, Specification of R/F, Principles of ring spinning. Types of Creel

UNIT - IV

Types of various drafting systems on Ring Frame – Drafting elements and their types- Selection of drafting system & elements – weighing of drafting rollers- Principle of Twisting – Types of Twists – Twist levels and their selection for 100% cotton, P/C, P/V & 100% Synthetics – Twist Factor and its importance – Twisting arrangement – Observed and calculated twist – Twist contraction -Principles of winding, Types of builds – builder motions – Arrangements made before and after Doffing – Labor allotment .

UNIT - V

Wrapping test – Developments in ring frame – Ring data – Production Calculations-Quality control aspects in Ring Spinning-Post spinning operations – Systems of doubling – Doubling twist – Two from one twister – Up twister and Down twister – Brief note on reeling, bundling and baling – machinery and process for waste spinning.

TEXT BOOKS:

• 1. Cotton Combing – A.R.Khare, Mahajan Book Publishers, Ahmedabad, 2003
• 2. Spun Yarn Technology Vol. III- Vekatsubrmani, SSM Co-operative Stores, Komarapalyam,2003
• 3. Essential facts of practical cotton spinning – T. K. Pattabhiraman Mahajan Brothers Ahmedabad, 2005 Drawing, Combing, and Roving, Ring Spinning - NCUTE Pilot Programme, IIT, New Delhi,2004

REFERENCE BOOKS:

• 1. Short Staple Spinning – W.Klein, Textile Institute, 1993.
• 2. Tablets on Combing, Speed Frame, Ring Frame- TAI Publication, Series Editor – T.V. Ananthan, 2003
• 3. Recent Developments in Yarn production – K.R. Salhotra, Textile Association, Bombay 1983.