Spring is a self-cleaning drum filtration system, with permanent metallic net, suitable to clean neat oil or emulsion from magnetic or non-magnetic particles. It’s available in 9 sizes with flowrates from 25 to 1000 l/min of neat oil and from 50 to 2000 l/min of emulsion. Drum’s filtration efficiency can be customized following the needs of the customer.

Working principles

  • The filter fabric covering the drum is clean. The dirty coolant passes through it depositing the pollutant particles and goes through the discharge opening.From here the cleancoolant falls into the collection tank positioned below, from where pumps will transfer it back to the machine tool. During this phase the drum does not rotate and the dredging system is stationary. The polluting particles deposited on the filter net forms the actual filtering layer which can also reach a thickness of 10-15 mm.
  • As the filter net gradually gets dirty, the liquid level increases. The dirty coolant continues to deposit pollutant particles onto the drum surface, while the drum and dredging system are still. The filtration level improves due to the thickness of the mud deposited on the filter net.
  • Coolant cannot pass through the filter net any longer – filter net clogging cycle is complete. This phase is when the best filtration level is reached. The longer the filter operates under these conditions, the better the average filtration will be. When the coolant reaches the maximum internal level allowed, a self-cleaning cycle is started automatically (see box page 4). At the end of this phase the coolant level descends and the filtration cycle begins again.


dmd optional

Pre-filtration system with rotating magnetic discs for the separation of magnetic polluting particles from coolant.

skim optional

Superficial oil skimmer, it allows to lengthen coolant quality and eliminate odors generated by anaerobic bacteria.

vasca rilancio opt spring
Tank for the dirty liquid delivery to the filter

To collect dirty liquid for feeding the filter (only Spring)

compattafanghi optional
Mud compactor

Used to reduce the volume of mud intended for disposal and for reducing the liquid contained therein. The obtainable compacting level can change on the basis of mud, liquid used and many other factors such as cycle timing. The reduction in volume and of humidity is obtained through pressing with static load. The volume efficiency reduction is from 40% to 20% and for liquid residual from 30% to 10%.