core blowing - core purging

KernspülenWhen do you need the core blowing option for a filter press?

During different filtrations a solid filter cake in the cloudy infeed  of the filter plates will not be formed.
For other applications, for example fully automatic filter presses, a solid filter cake in the cloudy infeed is unwanted.

If liquid suspension remains in the cloudy infeed after filtration, it will leave the filter press upon opening and this can lead to grave problems.

Soiled filter cloth or debris at the bottom edge of the filter plates are just some of these unwished effects. Poor filtration results and high mechanic stress for the filter press are the outcome.

Operating mode of the core blowing

Through a valve, mounted at the movable pressure plate of the filter press, pressurized air is blowed into the cloudy infeed. The suspension inside the cloudy infeed is pressed back through a return pipe for example into the drum.
The need of pressurized air is comparatively small, as the volume of the cloudy infeed is just approximately between 2l and 15l.

Who needs a device for core purging?

If the suspension inside the cloudy infeed is compressed to a paste-like mass during filtration, then the paste-like mass cannot be removed by using core blowing alone. Especially membrane filter presses are prone to this problem. Also here soiled filter cloth or debris at the bottom edge of the filter plates are just some of these unwished effects.

Operating mode of the core purging

Through a valve, mounted at the movable pressure plate of the filter press, water is lead in the cloudy infeed. The water passes through the cloudy infeed, assimilates the debris, and flows back through a return pipe for example into the drum.
Only water is left in the cloudy infeed, which can be easily removed by core blowing.