By C A Lawrence
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Additional info for Advances in Yarn Spinning Technology
Consequently, the leading ends of the edge fibres are not controlled by the S-twist propagating from jet 2; they are free to move with the vortex of jet 1, in the opposite direction (the Z-direction) to the twist in the core. The vortex of jet 1 therefore wraps the edge fibre around the twisted core, forming the wrap-spun or fasciated yarn. 2 Filament wrapping Two techniques are used for wrapping a filament around a drafted ribbon of fibres to produce a wrap-spun yarn. Selfil spinning This process is an adaptation of the Repco system, replacing one of the alternately twisted strands with an alternately twisted filament (or filaments) .
E. the open end) that is rotated to twist the fibres into the yarn structure and thereby form a new length of yarn: see Fig. 15. E. spinning. a previously spun length. E. method commercially, namely rotor spinning and friction spinning. Both use a rotating roller having angled points projecting from their peripheral surface to remove a small number of individual fibres at a time and transport them to a collecting surface holding the yarn tail. 16 depicts the essential features of the rotor spinning system, which are ∑ The feed roller and feed plate ∑ A saw-tooth or pin-covered roller called an opening roller ∑ A tapered tube termed the transport channel ∑ A shallow cup called a rotor (a groove is cut into the internal peripheral surface, termed the rotor groove) ∑ A flanged tube (called the doffing tube) which faces the rotor base, coaxial to the rotor spindle ∑ A pair of delivery rollers that feed the spun yarn to the winding unit.
Directly driving the bobbin presents the following problem. It is the surface speed that is of importance, initially of the bobbin, but then of the package being formed as the yarn layers build up onto the bobbin. The spinner has to hand draft at a rate which equals this speed. Each yarn layer wound onto the bobbin increases the surface speed of the package being formed. The package diameter has therefore to be limited, since there is a maximum speed at which the spinner could hand draft. Limiting the package diameter in turn limits the yarn length on a package for weaving; assuming the practical issues were resolved, increasing the package length would only give a small improvement in package size.