A nanofiber nonwoven product is disclosed which comprises a polyamide with a relative viscosity from 2 to 330, spun into nanofibers with an average diameter of less than 1000 nanometers (1 micron). In general, the inventive products are prepared by: (a) providing a polyamide composition, wherein the polyamide has a relative viscosity from 2 to 330; (b) melt spinning the polyamide composition into a plurality of nanofibers having an average fiber diameter of less than 1 micron, followed by (c) forming the nanofibers into the product.

The present invention discloses a preparation method of a cotton bast fiber and chitosan composite non-woven fabric for filtration and belongs to the technical field of fiber materials. The preparation method adopts steam flash explosion for pretreatment to separate cotton bast first, then a papermaking method is used for forming, finally chitosan is added to enhance the mechanical performance and improve the filtration efficiency, and a technological process is simple, environmentally friendly and suitable for industrial production. The non-woven fabric adopts lignin-rich cotton bast fibers and chitosan as raw materials, so that the non-woven fabric has good antibacterial performance. The cotton bast and chitosan used in the preparation method are both bio-based materials which can be degraded in the natural environment after use, so that burdens caused to the environment are reduced. At the same time, the problem that electrospinning methods are difficult to use in industrialized and mass production is avoided.

The present invention discloses a preparation method of a cotton bast fiber and chitosan composite non-woven fabric for filtration and belongs to the technical field of fiber materials. The preparation method adopts steam flash explosion for pretreatment to separate cotton bast first, then a papermaking method is used for forming, finally chitosan is added to enhance the mechanical performance and improve the filtration efficiency, and a technological process is simple, environmentally friendly and suitable for industrial production. The non-woven fabric adopts lignin-rich cotton bast fibers and chitosan as raw materials, so that the non-woven fabric has good antibacterial performance. The cotton bast and chitosan used in the preparation method are both bio-based materials which can be degraded in the natural environment after use, so that burdens caused to the environment are reduced. At the same time, the problem that electrospinning methods are difficult to use in industrialized and mass production is avoided.

The present disclosure relates to a composition that includes a base layer having an outer surface and a first thickness and a material that includes a plurality of cellulose nanofibers in physical contact with the outer surface, where the composition has an average filtration efficiency of less than or equal to 90% for particles having a characteristic length between about 50 nm and about 100 μm and the composition is characterized by an average inhalation resistance of less than or equal to 35 mm H.sub.2O as measured across the first thickness and the material.

A hot-extraction paper consisting substantially of cellulose and manufacturing assistants needed in cellulose and manufacturing assistants needs in cellulose production, such as pH modifiers based on acids and/or bases, the paper comprises exclusively cellulose having fibre lengths of at least 2.0 mm on length-weighted average, more particularly at least 2.5 mm on length-weighted average, and has isotropic extension properties which are substantially equal in machine and cross directions and amount to at least 7.5%, more particularly at least 8.5%.

A hot-extraction paper consisting substantially of cellulose and manufacturing assistants needed in cellulose and manufacturing assistants needs in cellulose production, such as pH modifiers based on acids and/or bases, the paper comprises exclusively cellulose having fibre lengths of at least 2.0 mm on length-weighted average, more particularly at least 2.5 mm on length-weighted average, and has isotropic extension properties which are substantially equal in machine and cross directions and amount to at least 7.5%, more particularly at least 8.5%.

A method for making air purifying paper goods uses wood chips and an air purification compound. The air purification compound is preferably a zeolite compound used to extract VOCs from an environment. The method begins by processing the wood chips into a raw pulp slurry with a pulping system. The method continues by separating organic fibers from lignin compounds in the raw pulp slurry with a processing system. The method continues by mixing the air-purification compound into the organic fibers to form a paperboard pulp mix with a mixing system. The mixing system is capable of incorporating the air purification compound into the organic fibers at any point during any secondary processing operation required to transition the organic fibers into the paperboard pulp mix. The method continues by manufacturing at least one paper good from the paperboard pulp mix with a manufacturing system.

A method for making air purifying paper goods uses wood chips and an air purification compound. The air purification compound is preferably a zeolite compound used to extract VOCs from an environment. The method begins by processing the wood chips into a raw pulp slurry with a pulping system. The method continues by separating organic fibers from lignin compounds in the raw pulp slurry with a processing system. The method continues by mixing the air-purification compound into the organic fibers to form a paperboard pulp mix with a mixing system. The mixing system is capable of incorporating the air purification compound into the organic fibers at any point during any secondary processing operation required to transition the organic fibers into the paperboard pulp mix. The method continues by manufacturing at least one paper good from the paperboard pulp mix with a manufacturing system.

Processes for increasing the viricidal activity of a fiber substrate. The fiber substrate is provided. An antiviral treatment containing a quaternary ammonium or phosphonium compound is introduced to the fiber substrate to form an antiviral substrate. The treated fiber substrate is washed and dried. The antiviral treatment may occur before or after the fiber substrate is incorporated into the HEPA filter media in a papermaking process. Also a filter made from treated fiber substrates.

Processes for increasing the viricidal activity of a fiber substrate. The fiber substrate is provided. An antiviral treatment containing a quaternary ammonium or phosphonium compound is introduced to the fiber substrate to form an antiviral substrate. The treated fiber substrate is washed and dried. The antiviral treatment may occur before or after the fiber substrate is incorporated into the HEPA filter media in a papermaking process. Also a filter made from treated fiber substrates.