Mitarbeiter der KNOLL Maschinenbau GmbH montiert Vakuumfilter VLX
Filteranlage Vakuumfilter VLX - KNOLL Maschinenbau GmbH

Areas of application

The vacuum filter VLX is a high performance filter for cleaning the cooling lubricants (CL) of machining processes, in particular grinding processes. Due to the high filter capacity, the product is an ideal component of a central cleaning system for several machines. Its special efficiency is a result of high energy efficiency, low cooling lubricant loss and low disposal costs.


  • Production of pure concentrate with lower residual moisture without filter media
  • Optimised filter capacity, filter quality and energy efficiency thanks to the intelligent control system
  • Problem-free chip and light alloy discharge
  • Almost constant filter quality without outlier
  • Continuous filter process without reserve flushing interruption
  • Forced degasification of coolant lubricants in the filter, optionally supported by the overhead tank system
  • Can be used for different machining processes, materials and coolant lubricants


Filtration process

The contaminated liquid flows through the inlet box into the base of the dirt tank and rises. In the filter chamber the vacuum pumps generate a vacuum. The liquid runs through the filter belt, which holds back the dirt particles, into the filter chamber. A thick filter cake (concentrate) is formed which also acts as a filter medium and separates smallest dirt particles. A filter pump conveys the cleaned liquid to the clean tank. The filter and vacuum pumps are regulated in such a way that the system only filters the maximum required liquid quantity.

Filter belt regeneration

As the filter cake is growing, the permeability of the filter surface decreases and the level of the contaminated liquid rises. At a selected fill level, the belt drive switches on and conveys the carrier belt together with the filter belt a little further. Thereby, permeable filter belt reaches the filter surface, causing the volumetric flow to increase and the level of contaminated liquid to decrease again.

The filter belt passes through the following stations:

  1. Prefiltering device (belt already has a thin filter cake)
  2. Filtering section (separation of dirt particles)
  3. Drying section (extraction of liquid from the concentrate)
  4. Blow-off nozzle and knock-off shaft (separation of the concentrate from the belt)
  5. Flushing nozzle (separation of the remaining particles from the belt)


Filter systems

Vacuum filter VLX

Overview of our filter range: