The RSB-D 40 drawframe in the spinning mill - results from mill operations
by Juergen Mueller, Head Product Management Drawframe,
Rieter Textile systems.

Booming sales of the new drawframe generation

Rieter presented the new RSB-D 40 autoleveler drawframe and the SB-D 40 drawframe without leveling to a global audience for the first time at ITMA Asia 2005. Their convincing customer benefits have resulted in an out-and-out sales boom – with more than 2,800 drawframes already sold. Some results from mill operations are presented below:

RSB-D 40 - The quality filter for your spinning mill

The drawframe is the final stage in the spinning process that significantly improves quality. Fluctuations in mass that are not eliminated on the drawframe reappear undiminished in the yarn. This is where the RSB-D 40 displays its decisive advantages through even more precise scanning and enhanced leveling dynamics. The RSB-D 40 is demonstrating in numerous combed yarn spinning mills that it also reliably levels out high CV% values in sliver from competitors‘ combers. The quality of the sliver produced is assured (Fig. 1). These advantages also apply accordingly to spinning mills using carded fiber materials.

High productivity in the subsequent process

The high sliver quality of the RSB-D 40 improves running properties in the subsequent processes. This is shown, for example, by a carefully conducted comparison in a Turkish rotor spinning mill with RSB D 40 and RSB-D 30 drawframes. The spinning mill processes carded cotton into Ne 20 weaving yarn. The RSB-D 40 drawframes operate at  750 m/min, some 7% faster than the comparative model. The efficiency of the rotor spinning machine increases by 0.40 percentage points from 98.7% to 99.1% with the RSB-D 40 sliver, due to fewer ends down and clearer cuts. In this case the additional yarn output adds up to a cash benefit of some 2,400 euros p.a. per RSB-D 40. With an Ne 30 yarn the annual cash benefit would be more than 4,000 euros.

A comparison of the RSB-D 40 with the predecessor model in a ring spinning mill reveals advantages in processing cotton with a high honeydew content. The top rollers remain cleaner as the cleaning lips are raised at intervals. The cleaning cycle was increased from 0.5 hours to 4 hours despite the critical material. The clean top rollers are less inclined to form laps. In this ring spinning mill efficient suction system improved yarn cleanliness and halved the number of clearer cuts on the winder from 80 to 40 cuts per 100 km of yarn (Fig. 2). The corresponding reduction in piecings results in better yarn quality and savings on the winder due to less yarn waste and lower compressed air consumption amounting to more than 2,200 euros p.a. per RSB-D 40.

Upto 10 tonnes of sliver per day and drawframe

Delivery speeds can be increased by 10 to 15% compared to the RSB-D 35 for all materials. Efficient suction system ensures trouble-free running in the drafting system and sliver formation zone and keeps efficiency high. Efficiency also depends on delivery can format and especially on the supply of cans by operating personnel. At sliver weights of 7.0 ktex the drawframe achieves an output of up to 10 tonnes of sliver per day (Fig. 3).

Clean processing of manmade fibers

Feedback from various manmade fiber spinning mills confirms the advantages of the new CLEANcoil coiler. When polyester is being processed, the patented honeycomb structure enables the cleaning cycle to be prolonged from 2 to 3 hours to 1 to 7 days, depending on the type and quantity of finishing agent. A further convincing feature is the simple sliver separation device without additional mechanisms or drives, which reliably separates manmade fiber slivers at can change.

Very easy operation and maintenance

Our customers make special mention of the following characteristics in discussions of user friendliness: self-adjusting leveling by means of AUTOset saves a large number of manual laboratory tests and ensures superior quality the AUTOhelp spectrogram fault diagnosis system facilitates the rapid elimination of faults; the causes of faults appear on the machine display panel in the form of a marked transmission diagram the electronic documentation with more than 40 videos assists ease of understanding and operation; our customers also use the DVD for training personnel.

Easy machine operation, robust engineering and further improved, consistent RSB yarn quality confirm once again the saying current among mill managers: "Buy a RSB and sleep soundly."