Yarn Manufacture I : Principle Of Opening, Carding And Drawing

ABOUT THE COURSE: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 fibresINTENDED AUDIENCE : Undergraduate students of Textile Technology

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