The output signals from load ceils installed into the top and bottom bag mounts are combined with
a ‘lift’ factor to correct for the effect of the pressure drop across the filter, and are then expressed
as a bag weight. Monitoring of this bag weight parameter during several successive filtration
cycles has provided filtration research with a clear view of dust cake build-up and release
processes. Some initial observations of missed, or ineffective, shakes, as well as the timing of
cake dislodgment and the behaviour of the bag tension during the shake cleaning, are reported.