It’s commonly known that bagless sectors eliminate the need of shutting down a disc filter for filter bag changes. That’s undoubtedly an important benefit to maintenance, but how to overcome thickening performance shortcomings of conventional bagless sector designs, particularly “corrugated” sectors?

In comparison:

The asymmetrical corrugated sector design creates hydraulic flow impingements. The fiber mat is not uniform due to the peaks and valleys of the corrugations. This lowers the maximum rotational speed and therefore limits the  capacity of the disc filter. Overlapping areas in the sector interior make cleaning more difficult, and there is a tendency for inside scaling.

The Conical Cell bagless sector design from ANDRITZ offers significant improvements in terms of operation and maintenance. Since the sectors are basically flat, they produce a very uniform fiber mat that is easily doctored off in one piece. Thus, the CC sector allows a filter to run faster than a corrugated sector, accounting for a production boost of 15-20%. The way the plates are manufactured results in a 5% increase in effective filtering surface compared to a flat sector fabric. The open design is easy to clean.

Conclusion: Corrugated sector design versus CC bagless