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
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