Download Advances in Yarn Spinning Technology by C A Lawrence PDF
By C A Lawrence
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Additional info for Advances in Yarn Spinning Technology
The middle roller pair therefore pulls forward the fibres they have nipped, feeding them towards the faster-moving front pair. This action gives an initial attenuation to the roving. The action, however, is repeated between the middle roller pair and the front roller pair, and with the latter having a much faster speed the roving © Woodhead Publishing Limited, 2010 16 Advances in yarn spinning technology is fully attenuated to the amount required. Drafting, therefore, takes place in two zones: the back zone, formed by the back and middle roller pairs; and the front zone, formed by the middle and front roller pairs.
For continuous Z- and S-twist insertion, the twisting devices need to be repeatedly rotated clockwise then counter-clockwise, the change in direction being made when the maximum twist values are reached. We can see from the figure that each Z–S twisted strand can be related to a sinusoidal wave plotted on Cartesian axes, where the twist levels and directions are along the y-axis and the twisted length along the x-axis. Thus, l represents the wavelength and in terms of the yarn length is called the cycle length, X.
To achieve this, the spindle has mounted on its top, above the bobbin, a component known as the flyer. This is fitted to rotate with the spindle. The flyer is shaped to have two legs or arms, B in Fig. 8, for balanced rotation and a hollow central shaft with a side hole, F. Each leg has a series of wire guides, E, and the gap between the legs governs the diameter to which the yarn can be built on the bobbin, and thereby the amount of yarn or the total continuous length that can be wound onto the bobbin.