KNOLL Maschinenbau GmbH Schwarzachstraße 20
D-88348 Bad Saulgau

Tel.+49 (0) 7581/2008-90388
Fax+49 (0) 7581/2008-90140

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Further information

Vacuum filter VLX

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 filtering system for several machines. Its particular operating efficiency is a result of high energy efficiency, low coolant 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




Filtering process
The contaminated fluid flows through the intake box into the base of the sludge tank and rises. The vacuum pumps in the filter chamber generate a vacuum. The fluid runs through the filter belt, which retains the dirt particles, into the filter chamber. A thick filter cake (concentrate) is created, which itself serves as a filter medium and precipitates the smallest of dirt particles. A filter pump conveys the cleaned fluid to the clean tank. The filter and vacuum pumps as controlled so that the system only filters the maximum required fluid quantity.

Filter belt regeneration
With an increasingly thick filter cake, the permeability of the filter surface is reduced and the contaminated fluid level rises. At a defined fill level, the belt drive switches on and conveys the carrier belt, together with the filter belt, forwards. Permeable filter belt is thus moved onto the filter surface, the volume flow increases and the contaminated fluid level decreases. The filter belt runs through the following stations:
a) Prefiltering device (belt already has a thin filter cake)
b) Filtering phase (precipitation of dirt particles)
c) Drying phase (removal of fluid from the concentrate)
d) Blow-off nozzle and knock-off shaft (separation of the concentrate from the belt)
e) Scavenging nozzle (separation of the remaining particles from the belt)

Vacuum filter VLX