By C A Lawrence
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Additional resources for Advances in Yarn Spinning Technology
Card slivers can have up to three drawing passages, depending on whether different fibres of similar lengths are to be blended and then spun. Following drawing, the drawn sliver (or drawframe sliver) is fed to the roving frame. The drawing process for wool slivers is similar, but the difference in machine systems is that a 2-over-2 unit is used and within the drafting zone an intersecting pin action is used to straighten the fibres. Carding and drawing are only two of several preparatory stages that were developed to advance the spinning of cotton and wool fibres.
The two important advancements that the water frame contributed to spinning development were the application of roller drafting and a modification to the winding of yarns by a flyer-spindle device. 9 depicts the key features of Arkwright’s water frame on a four spinning position machine or ‘four spindle machine’. The roller drafting system is positioned above the flyer-spindle, in such a way that the angle of the forming yarn to the spindle axis during twisting on the spinning wheel is retained.
Hence, the twist proceeds from the inside to the outside of the new length of yarn being formed; this action is called twisting-out. The fibres caught on the core are highly twisted and the twist level gradually decreases from the core to the sheath. e. the twisting element, will obtain the same number of turns of twist, but with opposite directions (Fig. 2(a)). On moving the fibre strand through the point of twist insertion, the torque present in the upstream length will be cancelled as it passes the twisting element by the opposite torque present in the downstream length of the fibre strand.
Advances in Yarn Spinning Technology by C A Lawrence