DRAFTING IN SPINNING PROCESS Principle of yarn manufacturing pdf

DRAFTING IN SPINNING PROCESS Principle of yarn manufacturing pdf

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  PRINCIPLE OF YARN MANUFACTURING
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  DRAFTING IN SPINNING PROCESS DIRECTED BY: SHUBHAM JOSHI SIR
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  MADE BY : 1704460052SHASHANK YADAV 1704460053 SHIVAM JAISWAL 1704460054 SHIVANI GAUTAM 1704460055 SHIVI SINGH 1704460056 SRISHTI AGARWAL 1704460057 TARUN RAJPUT 1704460058 TRIPTI SINGH 1704460060 VIJAY PARAKASH 1704460061 VIKAS KUMAR YADAV
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  What is Drafting? Drafting,in yarn manufacturing process of attenuating the loose assemblage of fibres called sliver by passing it through a series of rollers, thus straightening the individual fibres and making them more parallel.
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  What is Drafting? Drafting is the creation of a drawing or other graphical representation of a building , mechanical device or other structure for the purposes of determining how the device should be created. Drafting is used as a part of the design and fabrication processes. Drafting can be done by hand or using specially designed computer programs and mechanical drawings. Drafting arrangement is the most important part of the machine. It influences mainly evenness and strength. The following points are therefore very important  Drafting type  Design of drafting system  Drafting settings  Selection of drafting elements like cots , apron , traveler etc.  Choice of appropriate draft  Service and maintenance
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  Draw frame Drafting
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  Operations of Ringframe  to draft the roving until the required increase is achieved.  To impart strength to the fibre by increasing twist.  To wind up the twisted strand (yarn) in a kym suitable for storage, transportation and further processing.
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  (b) SacoLowell Versamatic DrawFrame In this, the frame is with ¾ drafting system – can process staple length from 1” to 2”. The middle top roller doesn’t touch the second bottom roller giving ‘Slip Drafting’.
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  (c) Zinser DrawFrame The front bottom roller and two top rollers a modified version of 4/4 drafting offering tubular shaped web collector. For small setting, the second and fourth rollers are made movable. The draft is split-up between the back and the front zone.
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  (d) Polar Drafting Inlaxmi-rieters has usual back pair of rollers followed by two sets of ½ drafting systems. Second and third bottom rollers are smaller in diameter to enable closer setting. The loading is pneumatic and can be varied infinitely-0.75 kg per sq.cm.is normal pressure). The rollers are arranged in the arc of a circle enabling their movement by resetting levers. The scales are provided so that the rollers can be set without the need for using roller gauges.
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  (e) Whitin’s EvenDraft Draw Frame This has universal system of 4/5 drafting. Succeeding to usual back roller pair, there is ½ drafting system in the middle, the setting between third and forth bottom roller being fixed. The use of small diameter second and third roller permits closer settings.
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  Draft Calculations: As thematerial passes through the rip of the rollers, it gets pulled or attenuated. This motion of drawing or pulling of the stock continues throughout the spinning process. In some cases, there is attempt made to attenuate the material; while in some other cases, a very slight pulling action is exercised. At most of the places in the Blowroom, the latter action is followed, while the former action is used in may subsequent processes till the spinning of final yarn. There are thus three type of drafts 1) Mechanical Draft(M.D) 2) Resultant or Actual Draft(A.D/R.D) 3) Tension draft The relative speed difference in the rate of feeding and the rate of delivery results in mechanical drafting action. Since, this is governed by the mechanical gears or pulley diameters, it is called Mechanical Draft.
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  What is Drafting? Drafting,in yarn manufacturing process of attenuating the loose assemblage of fibres called sliver by passing it through a series of rollers, thus straightening the individual fibres and making them more parallel.
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  DRAFT CALCULATION As thematerial passes through the rip of the rollers, it gets pulled or attenuated. This motion of drawing or pulling of the stock continues throughout the spinning process. In some cases, there is attempt made to attenuate the material; while in some other cases, a very slight pulling action is exercised. At most of the places in the blowroom, the latter action is followed, while the former action is used in may subsequent processes till the spinning of final yarn. There are thus three type of drafts 1) Mechanical Draft(M.D) 2) Resultant or Actual Draft(A.D/R.D) 3) Tension draft
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  Mechanical Draft The relativespeed difference in the rate of feeding and the rate of delivery results in mechanical drafting action. Since, this is governed by the mechanical gears or pulley diameters. Mechanical Draft=length delivered/length fed
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