Disclosed is a method of manufacturing a non-woven fabric made of fibers containing a crystalline alicyclic structure-containing resin. The method includes; a step A of melting the crystalline alicyclic structure-containing resin; and a step B of shaping the melted crystalline alicyclic structure-containing resin into the non-woven fabric using a melt-blowing machine. The non-woven fabric has a pore diameter as measured by a bubble point method of 5 μm or less.

A composite multi-layer textile, comprising at least one nanofibre layer with nanofibres with diameters below 100 nm and one support layer with microfibres with diameters below three microns, wherein the layers were produced by electrospinning. The multi-layer textile shows a general transmittance at #=550 nm greater than 60%, which shows improved properties concerning transparency, breathability and robustness. This is achieved in that the at least one nanofibre layer and the support layer are fused, forming solid domains in the multi-layer textile, at closed areas of a pattern used in the production process, wherein the solid domains are separated from each other or connected, showing defined shapes, with regular or irregular spatial distribution, while the fibre morphology of nanofibres of the nanofibre layer and microfibres of support layer is preserved on top of the open areas beside the solid domains, attaining a general transmittance greater than that given by the sum of the individual layers.

An air delivery system comprises a visor having an outer peripheral edge and an inner peripheral edge. An air filtration assembly is removably mounted above an opening in the visor between the outer and inner peripheral edges, the air filtration assembly comprising a fan having an air inlet and an air outlet, an anode layer disposed over the air inlet, a filter layer disposed over the anode layer and a cathode layer disposed over the filter layer. In a first configuration, the air filtration assembly provides air flow toward an inner surface of the visor and, in a second configuration, the air filtration assembly provides air flow away from an outer surface of the visor. The air filtration assembly includes a mode actuator configured to control operation of a filtration mode indicator in dependence upon positioning of the air filtration assembly in the first or second configuration.

A layer for a protective mask (100a, 100b, 200a) comprises at least a first sublayer (122b, 218b), wherein the first sublayer (122b, 218b) includes a first substrate and a layer of a plurality of nanoparticles (124b, 7) of a nanomaterial provided on the first substrate. The protective mask (100a, 100b, 200a) includes an outer layer (120b, 230a) which is made of an organic fibular network bonded with nanomaterials. An air filtration element (900, 1070, 1240) for attenuation of airborne contaminants includes negatively charged nanodiamonds (920, 1320). A filter (1100, 1200, 1500, 1600) for an air conditioning system (1130, 1530) or an air purifier (1230, 1630) comprises the air filtration element (900, 1070, 1240). An air treatment element (1140,1300,1540,1640) comprises nanodiamonds (920,1320) including colour centers. The protective mask (100a, 100b, 200a), the air filtration element (900, 1070, 1240), the air treatment element (1140,1300,1540,1640) and the filter (1100, 1200, 1500, 1600) overcome or at least partially ameliorate some of the deficiencies as associated with those of the prior art.

In order to address the sustainability and environmental issues associated with conventional HVAC filters, inventive HVAC filters have been developed that are completely biodegradable and compostable and exhibit Minimum Efficiency Reporting Value (MERV) ratings that are superior to conventional HVAC filters. More particularly, it has been discovered that biodegradable electrospun nanofibers can be used to produce biodegradable HVAC filters that exhibit superior filtration performance relative to conventional HVAC filters produced from polypropylene electrostatic media or triboelectric nonwoven media.

A cylindrical filter device of the present invention includes a wavy filter screen, a sealing device, and a connecting device. The wavy filter screen includes a first flexible side strip, a second flexible side strip opposite to the first flexible side strip, and a plurality of wavy structures disposed between the first flexible side strip and the second flexible side strip. The wavy filter screen wraps to form a cylindrical structure with respect to an axis. The opposite ends of the cylindrical structure are respectively wrapped to form a first opening and a second opening by the first flexible side strip and the second flexible side strip. The sealing device is disposed at the first opening and has a first groove. The first flexible side strip is able to engage with the first groove with its elasticity and makes the first opening be sealed by the sealing device. The connecting device is disposed at the second opening. The connecting device has a second groove and a port. The second flexible side strip is able to engage with the second groove with its elasticity and makes the second opening communicate with the port.

An improved technology for inactivation of viruses, for example the SARS-CoV-2 virus that is causing the Covid-19 pandemic, is described. The technology can include a device that includes a substrate coated in a polymer that is infused with a pathogen inactivating material. In various embodiments, at a given time, a portion of the pathogen inactivating material is exposed to the environment, and the device is configured to periodically or intermittently expose additional pathogen inactivating material to the environment. For example, the polymer can be ablative or sacrificial.

The present invention relates to a filter comprising a self-supporting body of non-woven carbon nanotubes useful in the sequestration of an airborne virus.

A non-woven fabric composite and an article including the same are provided. The non-woven fabric includes an electrostatically treated meltblown non-woven fabric layer and a spunbond non-woven fabric layer on one or both sides thereof, and has a fine dust removal performance retention ratio, represented by Equation 1, of 80% or more:

Fine dust removal performance retention ratio (%)=(fine dust removal efficiency after accelerated aging treatment)/(fine dust removal efficiency before accelerated aging treatment)×100  [Equation 1]

wherein, in this equation, the fine dust is an aerosol containing sodium chloride dispersed in air, and the accelerated aging treatment refers to a case where the non-woven fabric composite is stored at a temperature of 70° C. for 3 days.

A list of highly suitable textiles and a method to combine them into a durable reusable filtration medium with high particles filtration efficiency (PFE) and breathability that lasts over 50-75 laundering cycles. Filtration medium achieves PFE only through mechanical means, without fragile and harmful physicochemical pre-treatments. Different textiles are assembled considering their individual breathability and their complementary in terms of PFE on different particles' sizes to achieve good breathability and high PFE on a large range (20 nm-4 μm) after many laundering cycles, or several layers of the same textile are paired, while varying the fibers' orientation and dimensions in each layer to increase efficiency. This assembling method highly improves PFE, service life and performances' stability of the filtration medium by addressing structural weaknesses linked to anisotropy in each layer, and by protecting their fine fibers from mechanical wear and clogging through a face-to-face closed filtration cell-type pairing.