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The customer magazine of Rieter Spun Yarn Systems Vol  / No    June  / EN - page 19 / 24

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Optimal use of resources with compact ringspinning

The compact spinning process has become firmly established in the mar- ketplace in recent years The quality improvements achieved through using the compacting process open up many opportunities for utiliza- tion by spinning mills and downstream processors This article reports on experience gained in an Indian spinning mill

The compacting process has resulted in a surge in quality in conventional ring-spun yarn Compact yarn displays considerably improved yarn param- eters especially in terms of hairiness and dynamo- metric stretch recovery Its technological superiority is undisputed as are the potential cost savings in downstream processes and in the fabric itself

Raw material utilization can be improved with the Com® compacting unit

The potential for optimization offered by the compact spinning process has been studied in cooperation with an Indian customer Quality output or raw ma- terial are the focus of the spinning objectives here and serve to compare the two spinning systems

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TECHNOLOGY

The development of compact spinning Rieter introduced the compact spinning process to the global ring spinning market  years ago The primary goal of this development was lower hairi- ness and higher yarn tenacity and elongation Two compacting systems dominate the world market – Rieter’s Com® system and Suessen’s Elite® system Compact spinning was originally used mainly for fin- er yarn counts and weaving yarns In the meantime its scope of application has also been extended to coarser yarn counts and knitting yarns

Spinning with different objectives Many modern ring spinning mills operate conven- tional ring spinning and compact spinning machines side by side thus offering mill operators the great- est possible flexibility in meeting customers’ differ- ing requirements The Indian mill selected for this comparative study produces Ne  knitting yarns for hosiery – on both spinning systems

Quality and output as the spinning objective Although yarns from conventional ring spinning and compact spinning machines cannot be mixed in downstream processing Indian spinning mills often make no distinction between the yarns ie do not la- bel compact yarns specifically as such They sell both yarns on the market as “ring-spun yarn” without any differentiation

In the first part of the study the two spinning proc- esses were compared with the focus on an optimum yarn outcome Table  Both types of machine op- erate at the same spindle speeds On the compact spinning machine the twist factor was considera- bly reduced This resulted in an increase in output of   kg per machine and year compared to the conventional ring spinning machine equivalent to a

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    increase in production The smaller spinning

triangle in the compact spinning process results in improved running behavior and a reduction in ends down from  to  per   spindle hours

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