A particle filtration system that includes first, second and third filter segments that each include several first, second and third filters. Each first, second and third filter includes a fibrous layer sandwiched between a pair of surface or outer layers. The range of pore sizes of each first, second and third filter varies according to the density of the surface layers relative to the fibrous layers.

Apparatuses of electrochemical antimicrobial face masks and methods for manufacturing the same are provided. In one embodiment, an electrochemical antimicrobial face mask may include an electrochemical antimicrobial section configured to inactivate microbes that are in contact with the electrochemical antimicrobial section, and a filtration section configured to provide additional protection that prevents a user from breathing in the microbes, and where the electrochemical antimicrobial section is attached to the filtration section. The electrochemical antimicrobial section may include a galvanic corrosion cell membrane configured to generate antimicrobial agents via a galvanic electrochemical reaction, a hydrophilic antimicrobial membrane configured to inactivate microbes using the antimicrobial agents, and a regeneration pad configured to supply materials to the galvanic corrosion cell membrane for generating the antimicrobial agents.

The present invention relates to a filter medium comprising a substrate and a fine fiber layer on top of the substrate, wherein the substrate comprises a first layer comprising first fibers having a first average diameter and a first maximum fiber length; a second layer comprising second fibers having a second average diameter and a second maximum fiber length; and a third layer comprising third fibers having a third average diameter and a third maximum fiber length;
wherein the boundary area between the first and the second layer forms a first blended area comprising first and second fibers; and the boundary area between the second and the third layer forms a second blended area comprising second and third fibers; and wherein the first and the third average diameters are each larger than the second average diameter.

The present disclosure provides a filter material used for automobile air conditioning and capable of filtering out volatile organic compound (VOC) gas, including a sandwich structure (100) and an activated carbon fiber (ACF) non-woven fabric layer (200) located at one side of the sandwich structure (100), where, the ACF non-woven fabric layer (200) is composed of interleaved ACFs, and the ACF non-woven fabric layer (200) is compounded with the sandwich structure (100) via hot melt adhesive (HMA) (210).

A filter pleat pack of the present disclosure includes an air filter medium folded into pleats. The air filter medium includes a laminate of a polytetrafluoroethylene (PTFE) porous membrane and an air-permeable supporting member. When a cut surface of the filter pleat pack is observed, the cut surface being taken along a plane perpendicularly crossing a pleat line of the filter pleat pack, the PTFE porous membrane has a first converging portion, a split portion, and a second converging portion in this order in a direction in which the membrane extends. In the split portion, the PTFE porous membrane is split into a plurality of layers in a thickness direction of the membrane and the plurality of layers are spaced apart from each other. At the first converging portion and the second converging portion, the plurality of layers converge into one layer. The filter pleat pack of the present disclosure is a filter pleat pack for which a collection efficiency decrease resulting from pleating is reduced.

A filter pleat pack of the present disclosure includes an air filter medium folded into pleats, wherein the air filter medium includes a laminate of a polytetrafluoroethylene (PTFE) porous membrane and an air-permeable supporting member, and the air filter medium has a shrinkage rate of 50% or more, the shrinkage rate being determined by a formula (d2−d1)/d2, where d1 is a smallest thickness of the PTFE porous membrane in a folding area of the air filter medium folded into pleats and d2 is a thickness of the PTFE porous membrane in a flat area of the air filter medium. The filter pleat pack of the present disclosure is a filter pleat pack for which a collection efficiency decrease resulting from pleating is reduced.

A filter element for an air filter assembly of an engine includes a primary filter media and a secondary filter media. The primary filter media has a plurality of pleats having first fold edges on an inlet face of the primary filter media and second fold edges on an outlet face of the primary filter media. The first and second fold edges extend from a first lateral side to a second lateral side of the primary filter media. The secondary filter media is constructed of a non-woven material and includes a first portion arranged on the inlet face of the primary filter media, a second portion secured to the first lateral side of the primary filter media, and a third portion secured to the second lateral side of the primary filter media.

Intra-nasal filter devices and methods for their manufacture and use are disclosed. An intra-nasal filter device includes: a first stage filter proximate the septum; and a second stage filter comprising a flexible material extending upwardly from the first filter stage filter; wherein the flexible material comprises: an impedance in the range of 0.02 to 0.2 cmH.sub.2O; an effective cross-sectional area in the range of 0.2 to 2 square inches; and a plurality of radially extending geometric structures disposed along an axial length of the second stage.

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.

Disclosed is a method and device for inactivating or killing airborne bacteria, fungi, molds and viruses by passing the air through a filter material formed of a fabric having particles of zinc disposed in discrete physically isolated locations, wherein the particles of zinc and oxygen from the air form half cells of a battery whereby to create an electrical field that inactivates or kills airborne bacteria, fungi, molds and viruses passing through the filter material.