Modern Developments in Spinning

Compact Spinning Protruding fibres from body of yarn, known as hairiness, is a characteristic feature of staple fibre yarns. This gives yarns and fabrics made from them a softer and comfortable feel. At same time, hairiness has some undesirable effects as pointed below 1.Full ralisation of strength of fibres is not realised as part of fibres are not integrated in yarn 2.Rough feel is given to yarns 3.Variation in hairniess is a source of weft bars and warp way streaks in fabric. 4.Long protruding hairs from yarn contribute to multiple breaks in weaving and fabric faults like stitches and floats. Compact spinning is designed to reduce hairiness in yarn. In traditional spinning fibres in selvedge of strand emerging from front roller nip do not get fully integrated into yarn because of restriction to twist flow by spinning triangle. These fibres therefore show up partly as protruding hairs or wild fibres. To overcome this effect, spinning triangle is nearly eliminated in compact spinning by incorporating a condensing zone after main drafting zone. The condensing zone has a revolving perforated apron with suction underneath. The fibres are collected on perforated track and thus get condensed. The width of strand under front roller nip is substantially reduced and this enables twist to flow right up to nip. As a result hairiness is substantially reduced. Compact spinning systems are offered by Rieter(Comforspin), Suessen(Elite) and ITV-Zinser among others. Benefits claimed from comfort spinning are

Part Program Selection on a Fanuc Power Mate with a Selector Switch

Synopsis: Fanuc Power Mate (Models D, F) has an option called “Workpiece Number Search”. Using this option, PMC can initiate execution of a specified part program. This is especially useful in cases where Power Mate is used to control special purpose machines that produce a known set of components. Such applications are found in batch production factories.

How it Works: To synchronize PMC and CNC functions, there is a communication area in Fanuc Power Mate where PMC & CNC exchange signals. These are a set of bytes and there are two areas namely: