This new hydrocharging system allows to manufacture highest-class electret filter media with increased filter-performance at lowest delta p. The pressure loss in typical face-mask media can be reduced to less than a quarter compared to conventionally charged media. Filtration efficiencies of more than 99.9% are easily achieved in typical filter media of 35g/m² at only 35Pa.

The new process excels as a future-proof technology due to its considerably lower water and energy consumption compared to other hydro-charging concepts. It allows an additional drying process to be dispensed for many applications, which has a huge impact on energy consumption.
Whereas conventional charging processes charge the finished nonwoven material, the new concept is based on the all-round charging of each filament. Thus, the effective charged surface area is about 10 times greater compared to surface-charged media.

Through controlled atomization, a charge is evenly transferred to the fibers from the water spray. A special additive is used to permanently bond the charge to the surface of each fiber. The result: filter media with a uniformly stable charge over the entire cross-section.

The new hydrocharging system is an industrially manufactured solution that can be seamlessly integrated into the production process. Easy to install, easy to set and easy to maintain by an integrated feature for quick changing. The new system is also easily retrofitted to existing systems as a plug & produce component.