RSB-D 50 Draw Frame:
A new dimension in productivity, quality and operation
by Jürgen Müller, Head Product Group Draw Frames, Machines
The new single-head draw frame generation is
characterized by its performance: productivity increase of upto
33%, reduced energy costs, quicker lot change at outstanding
sliver quality and easy, intuitive operation.
In the fall of 2016, Rieter introduced the new RSB-D50
single-head draw frame for the first time to a global audience
at the exhibitions ITMA Asia in China and ITME in India (Fig.1).
The new draw frame generation excels with a multitude of
innovative solutions. These reduce costs, increase the quality
and simplify operation and maintenance.
Fig. 1: RSB-D 50 draw frame – highest productivity with
1200 m/min delivery speed.
Energy saving drive
concept ECOrized with 25% fewer belts
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. 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 (Fig.
2). The quiet machine is evidence of the low abrasion.
Fig.2: The servomotor for the coiler allows rapid
optimization of the speed.
Lower electricity costs
The new drive solution generates yearly savings of
approximately Euro 1000 for each RSB-D 50. If the saving over
the lifetime of the machine is compared with the investment, a
very attractive ratio results.
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
Further optimized drafting system
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
guarantees central guidance of the sliver at all times and
therefore consistent sliver quality (Fig. 3). The web width is
reproducible and is set by simple swivelling of the guide
elements. Additional fiber guides in the main drafting field
prevent lateral slipping of the edge fibers. Fewer disturbing
faults in the yarn are the result. Furthermore, the top roller
bearings are permanently lubricated and run at a lower
When processing fibers with high fiber-fiber
friction, as is the case with man-made fibers, 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.
Fig.3: Patented sliver guide for consistent and
CLEANcoil-PES coilers for precise sliver coiling
CLEANcoil is the standard coiler for all fiber materials and
therefore offers maximal flexibility. 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 (Fig. 4) with a new type of coating
offers unique advantages in coiling.
Fig.4: CLEANcoil-PES: the coiler for 100% Polyester
Even with critical polyester fibers, the cleaning
cycle can be extended by at least 100%. This also leads to more
consistent sliver and yarn quality (Fig.5).
Fig.5: Precise coiling of Polyester slivers thanks to
Up to 33% higher
productivity at equal or better yarn quality
The SB-D 50 draw frame without leveling and the RSB-D 50
autoleveler draw frame produce, in practice, at a delivery speed
of up to 1200 m/min.
Depending on the fiber material, up to 33% higher speeds in
comparison to the previous model are possible.
The following is an example of a customer who
processes combed cotton. The RSB-D 50 is operating at 650 m/min,
the previous model RSB-D 45 at 480 m/min. Despite far higher
delivery speed, the sliver quality values of the RSB-D 50
achieve an equally good level (Fig. 6). The yarn count Ne 30
shows equal or even slightly better quality. In the nine-week
long-term test, the mean values of the disturbing faults on the
RSB-D 50 are also remarkable. Compared to the RSB-D 45, that
already achieves very good quality values, the Classimat values
could be improved by 13% and the winder cuts by 8%.
Fig. 6: With significantly higher production, the RSB-D 50
very good sliver and yarn quality.
Touch display and LED
displays for intuitive operation
The SB-D 50 and RSB-D 50 use the latest control
generation as well as a colored touch display with a high
resolution. This allows intuitive and easy operator guidance
Fig. 7: Easy operation: touching the selected fields leads
directly to the required menu item.
Clear indications are of decisive importance for
the operator when it concerns efficient working. Here, LEDs,
that are visible from afar and provide information on the
condition of the draw frame, help (Fig. 8). They simplify the
operator's work immensely. By means of the USB interface, the
data is quickly and easily transferred to other machines.
Connection to the Rieter mill control system SPIDERweb is
possible as a standard feature.
Fig. 8: LEDs visible from afar allow the operators to work
Technological know-how in the
Frequent personnel changes or shortage of specialists are
increasing problems for spinning mills. Rieter offers the remedy
with setting recommendations that appear directly on the machine
display. The basis is the well-known SLIVERprofessional expert
system which is now integrated in the machine display. It
provides valuable technological support. This unique tool offers
setting recommendations for the entire machine, after the raw
material data has been entered. These can be transmitted as a
data record onto other machines. In addition, SLIVERprofessional
assists with the analysis of spectrogram faults such as periods
and draft waves. In this way, faults are rapidly corrected and
the availability of the machine is increased.
Assembly on or recessed into the
The SB- and RSB-D 50 allow, as previously, assembly on the
floor. This makes very flexible positioning possible. A new
option is to install the machine recessed into the floor. This
means, the transfer height of the can on the empty can magazine
is lower and thus more convenient. The full cans are pushed out
directly onto the spinning mill floor.
Proven advantages of the RSB-D 45
The RSB-D 50 keeps unique features of the previous model
which are all patented. Here is a selection:
- Effective suction by automatically lifting clearer lips on
the top rollers.
- CLEANtube for sliver coiling without trash accumulations –
for cotton applications.
- Sensor for exact first sliver coils, even with can plates
that are too low.
With the RSB-D 50 and SB-D 50, Rieter sets another milestone
in draw frame engineering for the benefit of our customers. Once
more, the saying prevalent amongst mill managers “Buy an RSB and
you can sleep peacefully,“ applies in this context.