Rieter, a leading supplier of systems for short-staple fibre spinning, introduced the new RSB-D”¯50 single-head draw frame for the first time to a global audience at the exhibitions ITMA Asia in China and ITME in India last year.

According to the company, the new single-head draw frame generation offers a multitude of innovative solutions, which help reduce costs, increase the quality and simplify operation and maintenance. The new draw frame is said to offer productivity increase of up to 33%, quicker lot change at outstanding sliver quality, and easy, intuitive operation.

With the patented drive concept ECOrized, 25% of the belts and drive elements, as well as the differential gear, are saved, compared to the previous model, the manufacturer explains. Two servo-motors drive the drafting system. Unique features are the frequency-­controlled drive for the suction and the individual drive for the coiler. The new drive solution for the coiler leads to straight belt tracking and a far longer lifetime.

Lower electricity costs per year

The new drive solution generates yearly savings of approximately EUR 1,000 for each RSB-D”¯50, the company reports. As a standard feature, the draw frames are now equipped with integrated energy measuring. Should a significantly increased power consumption occur, preventive maintenance can be carried out and a breakdown of the machine thus avoided.

Even tougher with power fluctuations

With a short power fluctuation, the control voltage is supplied from the drive converter. This energy store can compensate short-term voltage interruptions and reductions. The draw frame keeps running. With longer interruptions, the draw frame with active autoleveling shuts down in a controlled manner. The web remains in the threaded condition and allows a rapid restart.

Further optimized drafting system engineering

Conventional sliver guides in front of the drafting unit are often wrongly adjusted. The most frequent fault is noncentral guidance of the sliver. The new, patented sliver guide is said to guarantee central guidance of the sliver at all times and therefore consistent sliver quality.

The web width is reproducible and is set by simple swivelling of the guide elements. Additional fibre guides in the main drafting field prevent lateral slipping of the edge fibres. Fewer disturbing faults in the yarn are the result, says the company.

When processing fibres with high fibre-fibre friction, as is the case with man-made fibres, active sliver separation is necessary for a trouble-free can change. To achieve this, the motors of the autoleveler drafting system create a thin place, which is transported below the coiler and deliberately breaks at can change.

Coilers for precise sliver coiling

CLEANcoil is the standard coiler for all fibre materials. The spiral coiling tube ensures coiling which is free of drafting faults, even at high delivery speeds. A honeycomb structure on the coiler underside reliably prevents deposits.

For the processing of 100 % polyester, the latest development CLEANcoil-PES with a new type of coating is said to offer unique advantages in coiling. Even with critical polyester fibres, the cleaning cycle can be extended by at least 100%. This also leads to more consistent sliver and yarn quality, the company reports.

www.rieter.com