Unit 1 Objects of Ring frame. Operating Principle of ring frame,

5 lecture hours

• Structural configuration of the machine
• Creel: Objectives of creel
• Types of creel
• Modern creel or Umbrella creel
• Drafting System : Function
• arrangement of drafting assembly (evolution of the design of drafting systems on the ring frames)
• conceptual structure of the drafting system – The top rollers and bottom rollers – construction
• types function and maintenance
• Top arm roller weighting system – study of weighting options – spring
• magnetic – Fibre guiding devices – long and short aprons
• concept of e-drafting
• Recent modifications in its design

Unit 2 Twisting process and Twisting elements

• Twist factor
• Twisting principle
• Twist flow in ring frame
• Direction of twist and the arrangement for setting yarn twist direction on ring frame
• Factor determining amount of twist for ring spun yarn
• Ring and Traveller : The function and importance of ring and travelers
• A) Ring : Ring shape – Standard
• T flanged single and double sided
• SV ring
• Inclined flanged
• enlarged and reduced etc
• Ring material
• brief note on ring manufacture
• Methods of mounting ring on ring frame
• Flange width and number
• ring diameter – importance and specifications
• Fibre lubrication on the ring
• Running in of new rings. 6 Subject Code: 3152901 w.e.f
• AY 2018-19 B) Traveller : Task and Function
• Traveller shape and its applications
• Traveller mass and its importance
• Materials used per Travellers
• Traveller wire profile
• The traveller clearer

Unit 3 Spindle

• general construction of a spindle
• design developments in spindles used on ring frames
• spindle bearings
• influence of spindle on the spinning process
• Spindle drive – Types of drives used to drive spindles – (i) tape drive
• (ii) tangential belt drive
• (iii) direct drive
• design in working merits and demerits of each type

Unit 4 The thread guide devices

• Functions and its importance
• The thread guide or lappet guide
• Balloon control ring
• Balloon separators
• Yarn Tension in Spinning: Concept and importance
• tension variations during spinning – factors affecting tension in yarn
• balloon theory
• Theory of yarn tension at ring frame
• Methods of maintaining uniform yarn tension at ring frame
• Balloon control and methods to control balloon shape

Unit 5 Drive to machine

4 lecture hours

• single motor
• dual motor
• variable speed (mechanical
• electronically controlled and inverter) drive – design features
• operating principle and merits and demerits of each
• Cop Buildup: Cop shape
• The winding process
• The winding mechanism
• base formation of cop, Motor powered cop formation
• End breaks in ring spinning – importance and mechanism of end breaks
• factors affecting end breaks

Unit 6 Doffing

4 lecture hours

• Preparation for doffing
• Manual doffing and automatic doffing
• Auxiliary equipment: Fiber extraction or waste collection system
• Blowers/ suction system
• Spinning The spinning Geometry: Terms used (a) The spinning triangle
• dimensions and its influence on end breakage and yarn structure (b) The spinning length (c) Spinning angle (d) Roller over hang (e) Other dimensions in spinning geometry
• Calculations regarding production and twist

Unit 7 Compact Spinning

4 lecture hours

• Basic problem of hairiness of yarns on Conventional Ring frame – Solution to the problem
• implementation of the basic solution
• Advantages of condensing
• Types of compact spinning systems used
• their merits and demerits
• Comparison of compact yarns and conventional ring spun yarns

Unit 8 Doubling

4 lecture hours

• Objectives of doubled or folded yarn
• Study on conventional ring doubling machine
• Direction of twist used in to produce double or ply yarn a) S on Z or Z on S, b) Z on Z or S on S list of its yarn products
• Two for one Twister: Principle of TFO, Passage of yarn
• Special features of TFO, Advantages over ring doubling

Unit 9 Fancy yarn

• Definition of fancy yarn
• Different varieties of fancy yarn
• Use of fancy yarn
• Grandrelle yarn
• Mock grandrelle or Marl yarn
• Spiral yarn
• Gimp yarn
• Corkscrew yarn
• Curl or loop yarn
• Snarl yarn
• Knop yarn
• Cloud yarn
• Slub yarn
• Knickerbocker yarn
• Nub 4 Subject Code: 3152901 w.e.f