The present invention falls within the area of polymeric materials applied to the sector of manufacturing materials for use in filters for filtration equipment such as ventilators and for protective masks. In particular, the invention relates to multilayer filters for ventilators and protective masks which can be biodegradable and which comprise filtration materials based on ultrafine fibers obtained by electrohydrodynamic and aerohydrodynamic processing and which exercise passive FFP1, FFP2, N95 and FFP3 protection and which can also be washable and have active antimicrobial properties.

Filter media including out-of-plane solid elements are generally described. Inventive methods of forming them and uses thereof are also described.

A filter element is provided that includes a plurality of individual fibers, wherein each individual fiber has a non-circular cross-section. The filter element also includes at least one flat sheet media, wherein the plurality of individual fibers are thermally bound to the at least one flat sheet media, wherein the flat sheet media is spirally wound to create a cylindrical profile.

An entrainment-based filtering system for use in connection with a facemask or respirator that includes: a filter housing defining an interior volume comprising at least one airflow pathway having an airflow pathway length that is longer than the length of the interior volume and spaced within the interior volume; and a plurality of entrainment substrates. The plurality of entrainment substrates is positioned within the at least one airflow pathway and the plurality of substrates and the dimensions of the at least one airflow pathway together function to entrain particles on the surface of the chemically coated entrainment substrates and prevent at least 95% of particles traveling through the at least one airflow pathway from exiting the entrainment-based filter.

A dustproof mask includes a mask body which is adapted to cover a user's face and forms a breathing space between an inner surface thereof and the user's face, wherein breathing of a user's respiratory system is performed through the breathing space, an air filter part disposed in front of the mask body, coupled to one side of an outer surface of the mask body, configured to be filled with external air which passes through an outer surface thereof formed of a filter material and contaminants therein are removed, and having a sealed pouch shape, and an intake valve part installed in a coupled portion of the mask body and the air filter part and operated to supply the air inside the air filter part to the breathing space during inhalation.

A filter assembly includes an inlet end, a sediment filter having a sediment filter surface facing the inlet end and cylindrical filters. The sediment filter surface is orthogonal to each cylindrical filter surface. A first channel and a second channel may fluidly connect the sediment filter to the more cylindrical filters. The first channel can have a central axis that is orthogonal to a central axis to the more than one cylindrical filter. A central axis of the second channel may be in a direction along the length of the more than one cylindrical filter.

The invention relates to a method for producing a filter device (1) for filtering a hydrophilic liquid, comprising a flat filter element (10) which is permeable to the liquid, wherein the filter element (10) has a delimited filter region (11) which is coated with a hydrophobic agent. The following steps are carried out: a) providing the flat filter element (10) which has in particular a nonwoven filter web (13) lying between a mesh support layer (14) and a spun-bonded fabric (15), b) producing a compressed annular boundary region (16) for the filter region (11), c) applying the agent onto the filter region (11) of the filter element (10), and d) obtaining the filter device (1).

Respiratory devices and methods for their manufacture and use are disclosed. The device features a resiliently deformable element configured to form a perimeter seal with the inner nostril wall and to swab the distal portion of the internal nostril region with a disinfectant during device installation. A first filter stage includes a first filter layer characterized by first geometric convolutions and a first MPPS1 value; and a second filter stage includes a second filter layer characterized by second geometric convolutions and a second MPPS2 value.

A replaceable air filter element is provided with fixation pockets configured to record corers or edges of reusable exoskeleton support frame. The exoskeleton support frame, The reusable exoskeleton support frame is adapted to detachably engage the fixation pockets to support the filter medium. The exoskeleton support frame of the filter element is configured to be reused such that only the filter medium is replaced, thereby reducing the environmental waste and making for a green eco-friendly air filter element.

An improved protective face mask used to filter out hazardous pollution and airborne germs and viruses. Embodiments include a three layer version including a first spunbond TETHYS SHIELD treated layer, a meltblown filtration layer, and a second spunbond layer; a four layer version further including a gasket layer formed of a felt material; and a five layer version further including an activated carbon layer in between the spunbond TETHYS SHIELD treated layer and the meltblown filtration layer.