It detects when the first sliver coils make consistent contact with the coiler and only then switches the machine from the slow mode to full production speed (Fig. 3).
This guarantees controlled sliver coiling also in cans where the plates are too low, and ensures consistent sliver and yarn quality. At the next process stage the cans therefore run without interruption until they are completely empty. This maintains machine efficiency at a high level, reduces operator intervention, eliminates sliver waste and keeps quality on a consistent level.
Even when only a small number of can plates are too low in a spinning mill, the new sliver sensor brings considerable advantages. Assuming 5% of the annual filled cans are affected, it sums up to more than 3 600 cans for each draw frame. This leads to about 2 300 kg of waste which can be avoided by the sliver sensor.
Reliable sliver separation without additional mechanics
Materials with a high fiber-to-fiber cohesion, like for example 100% polyester, need a sliver separation between filled and empty can for a trouble-free can change. Other products require a rather complex mechanical device here which causes wearing costs and comparably difficult settings. The SB-D 50 has a more elegant solution for this: Between the drafting system and the draw-off calendar a thin place is generated which is transported below the coiler and deliberately breaks at can change – without the need for additional parts.
Simple setting of suction intensity is a standard
Trash and dust on the pressure bar lead to sliver funnel blockages and impair the quality of the yarn. The efficient suction concept from Rieter ensures that – through the lifting of the cleaning lips − trash accumulations are removed directly via the suction. Practical tests confirm fewer sliver funnel blockages. The increased yarn cleanliness is shown in reduced imperfections and Classimat faults as well as in lower number of yarn clearer cuts.
Only on the Rieter draw frame, the operator can set the suction intensity easily and rapidly on the machine display as a standard. The setting is easy to reproduce. This simplifies not only material change but also eliminates quality deviations when, for instance, several draw frames are feeding sliver to one assortment.
Easy operation and rapid assortment changeover