A filtration media including at least a first nonwoven fabric having at least one meltblown layer in provided. The at least one meltblown layer includes a plurality of meltblown fibers having an average diameter from about 1 to about 5 microns. Methods of making a filtration media are also provided. Facemasks including such filtration media are also provided.

A dual layer filter material for separating fluid or particulates from flowing air streams that is comprised of connected layers of nonwoven batting with one layer having a convoluted surface.

A washable, high efficiency mask has a first, inner layer, a second, intermediate layer, and a third, outer layer. The second, intermediate layer is a filter media that achieves the 95% particulate filtration efficiency (PFE)/bacterial filtration efficiency (BFE) filtration. The second, intermediate layer is bonded to a layer adjacent thereto.

A face mask includes a fabric filter configured to be worn on a user's face. A composition with anti-viral properties is arranged on the fabric. The composition preferably includes anti-viral oils and an anti-viral metal such as copper or copper oxide.

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.

A nano silver active filter element comprises a filter element body which comprises sheet filter papers stacked of layered composite structures, the sheet filter papers successively comprises a nano silver antibacterial layer, a filter layer and a protection layer from an air inlet surface to an air outlet surface; the nano silver antimicrobial layer is prepared from phenolic complex fibers loaded with nano silver particles.

Filter media and filters are provided that include at least two layers and a plurality of nanoparticles dispersed in depth within at least one of the layers. A gas filter comprises a first layer of fibers, a second layer of fibers bonded to the first layer and a plurality of nanoparticles incorporated into the first layer. The nanoparticles increase the overall surface area within the filter, which increases its filtration efficiency and allows for the capture of submicron contaminants without significantly compromising other factors, such as pressure drop (i.e., air flow) through the filter. In addition, the filters disclosed herein are capable of withstanding rigorous conditioning, which allows the filter to achieve the same level of filtration performance throughout the lifetime of the filter. Systems, devices and methods are also provided for manufacturing such filters.

An annular filter includes a first annulus wall and a second annulas wall being impermeable to fluid (liquid and gas), a first circular wall and a second circular wall mounted between the first annulas wall and second annulas wall wherein the first and second circular wall are permeable to fluid (liquid and gas), at least one dividing wall mounted between the first and second circular wall to divide an internal volume defined between the first and second annulas wall and the first and second circular wall into channels, bisecting walls between the first and second circular walls to change a direction of fluid flow from a first direction to a second direction first and second channels, turbulator walls mounted channel, wherein the turbulator walls cause turbulent fluid flow in the channels, and a filter media positioned in at least one of the channels.

Fibrous filter medium that includes a surface-loading filter layer comprising fine fibers having an average diameter of less than 1 micron; a depth loading filter layer; and a support layer; wherein the layers are configured and arranged for placement in a gas stream with the surface loading filter layer being the most upstream layer.

The invention relates to a method for producing a respiratory protection mask (1) comprising a filter material piece (2) made of an air-permeable material, comprising the steps of: providing a first non-woven material; compacting the first non-woven material in regions; bonding the first non-woven material to a second non-woven material in the compacted region.