Bag Filters & Cyclonic Filtration
The Difference Between Bag Filters & Cyclonic Filtration
Cyclonic filtration has been around for many years in various industries. It uses centrifugal force to filter out particles. The weight of the particles determines where they end up; heavier contaminants are carried away in a stream of liquid to a settling or "sludge" tank and lighter, flake-like particles or chips pass through the filter back into the machine tool or secondary filter.
For this reason, cyclonic filters are best viewed as pre-filters or first stage filters which can remove a significant amount of impurities, with the finer impurities being removed by a fine screen, or filter bag downstream from the cyclonic system.
Cyclonic filtration marketers often promote their systems as “maintenance free”, but sooner or later someone has to clean out that sludge tank.
In addition, the longer sludge sits, the more likely it is that bacteria will grow.
Filter bags are inexpensive and necessary to remove the finest particles and they work like a trash bag liner in a trash can. They’re easy to remove and they capture all of the contaminants neatly inside.
These systems utilize the bag filters to aid in de-aeration of the coolant.