Micro filtration

MICRO FILTRATION

Micro filtration is a filtering process that can remove solid parts from liquids.

 

This is a very similar process to ultrafiltration, with almost the only difference being the size of the particles filtered.

 

The actual process is carried out with filters with holes measuring from 20 micron to 5 micron in diameter, which filter the microparticles in the mesh and/or microholes.

 

Micro filtration can definitely be combined with more advanced processing methods. The best results are achieved by high-tech grinding and finishing machines.

Why micro filtration?

Disposable systems are the classic cartridge and paper systems, which require constant maintenance with special care for regeneration, replacement and disposal costs.

 

Micro filtration improves the result of the material processed, the recovered of dregs and also reduces maintenance of operating parts and maintenance of tanks.

 

By preventing microparticles from passing through the holes one can recover a greater amount of impurities, which are then disposed of outside the system, with improved recovery and better micro filtration of the coolant and/water.

No contaminant in the processing fluids is the best result that can be achieved for all industrial systems and one should especially bear in mind the durability of coolants.

Micro filtration for machine tools – Micro filtration systems

The efficiency of a machine can be severely limited without a suitable filtration system in place. Namely, high-tech machines for drilling, tapping, grinding and finishing need an adequate micro filtration system to ensure you can make use of their full potential.

 

The micro-perforated system is the only self-cleaning system that guarantees 100% filtration.

 

This tool, with high resilience to chemicals is combined with a greater ease of cleaning the microholes, given their special geometrical cross-section.

 

The application of the micro-perforated model is the combination that turns it into an ideal tool for micro filtration systems as well, also considering its durability over time.

Our filtration systems guarantee:

Constant transmission of micro-filtered coolant

No cracks and breakage of the tips for internal refrigeration

Reliability over time of the pumps and valves whilst retaining their performance levels

No accumulation of residues of micro-chips and dregs in the circuit

Years without the need for maintenance of the booster tanks

Increased evacuation from the micro-chip system and dregs

No surveillance filters

No paper filters – candle filters – fabric filters

50µ absolute 15µ nominal value

31µ absolute 15 µ nominal value

19µ absolute 5 µ nominal value

TECHNICAL DESCRIPTION

The drum in the self-cleaning “rotary filter” can be fitted with a filter consisting of a micro-perforated nickel plate created with electrodeposition electroplating technology.

 

Our knowledge of MICRO-PERFORATION technology, used for our self-cleaning filters, is integral to the ”baffle” system.

The baffle provides durability, quick replacement of the baffle and improved filtration thanks to the self-cleaning system.

SUMMARY OF MICRO-PERFORATED PRODUCTS

Micro-perforation technology developed in the US is based on the electroforming of nickel screens briefly described here below:

 

  • Creation of a metal matrix with the micro-engraved surface consisting of multiple tips and relative cavities of the desired depth.
  • Filling of the cavities with non-conductor resin(s).
  • Drying and cleaning excess resin with abrasives to ensure a smooth and non-conductor surface.

 

The matrix thus obtained is passivised and placed in a suitable nickel-plating bath, as a cathode. This is where the nickel is electrodeposited across the whole suface and after a preset stay time at a precise current intensity, the matrix is removed and the screen is stripped.

 

As mentioned, the increase of the nickel deposit on the tips depends on the stay time in the bath, the current intensity and also the composition of the bath itself. By adequately combining these variables, the subsequent increase of the deposit causes increasingly smaller holes. This is how hole diameters up to 14 micron and less are reached.

 

For use in the filtration of liquids, one must consider the resulting relative free transit surface. The lesser the transit, the greater will be the surface required for the transit of the coolant.

NOTES ON THE DRUM'S SELF-CLEANING SYSTEM

The pressurised backwash of the drum itself was further developed in combination with the drum, with micro-perforated technology as a filtering means. Therefore two or several “sail” ramps were placed at a suitable distance calculated based on the materials processed and “mean elements” were created on its inner surface with a defined tilt, and likewise for the outer surface.

 

The ramps are fitted with nozzles across their length, which is the length of the drum itself. The correct tilt of the outer ramps creates a series of jets tangential to the surface, which suitably combined with that of the jets inside the drum, allows for the best possible cleaning of the filtering tool itself because of the above-mentioned design of the holes.

DURABILITY

A baffle with a micro-perforated system lasts about 24/48 months. Systems currently in operation show a durability of far more than 48 months.

 

The durability of the filtering baffle is associated with the continuity of the pressurised backwash. The lesser the clogging of the drum, the lower the use of the backwash and the filtering baffle will last longer.

MAINTENANCE

We recommend performing maintenance/checking the state of the filtering baffles within 12 months/3,000 hours of operation.

 

Refer to the instruction manual provided together with the system.

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