Rieter

Reduced labor costs in downstream processing

Index

Besides cost benefits in the manufacture of rotor-spun yarns versus ring-spun yarns in the coarse and medium count range, rotor-spun yarns also offer significant cost savings in some cases in downstream processing by virtue of technical application advantages (refer to section  Processing properties). Results from mill practice demonstrate that the following economies can be achieved, for example when processing Nm 50 / Ne 30 / tex 20 rotorspun yarns versus ring-spun yarns:

  • Warping: Machine downtimes reduced from 4.8 stoppages/ 107 meters for ring-spun yarn to 1.1 stoppages/ 107 meters. Assuming the cost of a machine stoppage of 0.5 €, this results in a cost reduction of € 0.02/kg of yarn.
  • Weaving: Machine downtimes reduced from 1 - 3 stoppages/ 105 picks for ring-spun yarn to 0.5 - 1.5 stoppages/ 105 picks for rotor-spun yarn. Assuming the cost of a machine stoppage of 1.0 €, this results in a cost reduction of € 0.25/kg of yarn.
  • Knitting: Significantly lower levels of contamination by fly when processing rotor-spun yarns enable machine downtime to be reduced in some cases; specific data on its influence on processing costs are not yet available, nor on the advantages of the straight flow of stitches in knitted fabrics made from rotor-spun yarns, which have a positive impact in make-up.

The cost benefits of using rotor-spun yarn are immediately and clearly demonstrable with regard to manufacturing costs in downstream processing in particular in vertically integrated mills.