Strictly speaking, the application of standard filtration media (needle felt) only provides an initial barrier for incoming particles of dust. The dust cake established on the filtration medium assumes the separation of the particles in the further process cycle.
It is technically desired that the particles of dust only separate on the surface of the filtration medium and not penetrate deeper. However in practice this is not possible, so that penetrating particles blind the filtration medium with time and the differential pressure increases.
In most cases, the penetrating particles are very difficult to remove from the needle felt during cleaning. The consequence is that the energy consumption of the filtration system increases, because cleaning is required more often. In addition, there is more demand on filtration material through the more frequent cleaning, which reduces the service life of the filter bags.
