Disclosed is a composite filter media. The composite filter media is formed from multiple layers of media material including a nanofiber media layer, where the layers are laminated, bound, or otherwise composited to each other. The composite filter media can comprise at least one nanofiber layer comprising polymeric media material having a geometric mean fiber diameter of about 100 nm to 1 m, and fibers configured in a gradient such that ratio of the geometric mean diameter of fibers at the upstream face of the nano fiber layer to the geometric mean diameter of fibers at the downstream face of the nano fiber layer is about 1.1 to 2.8, preferably about 1.2 to 2.4.

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.

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.

The invention relates to a filter medium comprising a nonwoven layer, which has bicomponent fibres, and a melt-blown layer, which comprises polyester fibres having an average diameter (d1) of less than 1.8 m. The thickness of the nonwoven layer is less than 0.4 mm at a contact pressure of 0.1 bar. At least 25% of the polyester fibres of the melt-blown layer have a diameter (d) of less than 1 m.

An object is to provide a filtration body capable of uniformizing the distribution of a layered double hydroxide in the filtration body and also preventing the surface of the layered double hydroxide from being covered with a binder or the like, thereby making it possible to improve the conventional filtration efficiency, and also a method for producing the same. The filtration body is formed of a layered double hydroxide having a crystallite size of 20 nm or less carried on a carrier including a thermally fusible fiber.

A method for producing a layered double hydroxide compact can achieve production thereof at a lower cost for a short time by simplifying a process for producing a layered double hydroxide compact, and also can maintain a desired shape. The method for producing a layered double hydroxide compact is characterized by having a synthesis step of synthesizing a layered double hydroxide, a forming step of holding the layered double hydroxide after the synthesis step to a holding material, and a drying step of drying the layered double hydroxide held to the holding material until the water content thereof becomes equal to or lower than 30%.

A filtration article is disclosed comprising a plugged porous honeycomb filter body, deposits of inorganic particles within the plugged honeycomb filter body, the deposits having a porosity in a range of greater than 95% to less than or equal to 99.9% and an average thickness in a range of greater than or equal to 0.5 m to less than or equal to 200 m, and at least some of the inorganic particles being fused to each other and/or to the filter body. The particles are fused by one or more of low-melting inorganic particles, inorganic particles capable of chemical bonding organic fusion bonds or organic chemical bonds between inorganic particles coated with an organic binder.

The spunbond non-woven fabric for a filter includes a composite polyester fiber containing a low melting point polyester arranged in the vicinity of a high melting point polyester, the low melting point polyester having a melting point 10 to 140 C. lower than the melting point of the high melting point polyester, the spunbond non-woven fabric having a surface layer and a back layer, the composite polyester fiber having a single fiber fineness of not less than 1 dtex and less than 3 dtex at the surface layer and said composite polyester fiber having a single fiber fineness of not less than 3 dtex and not more than 5 dtex at the back layer, and the spunbond non-woven fabric having a basis weight of 130 to 300 g/m.sup.2. A spunbond non-woven fabric for a filter having high rigidity and air permeability as well as excellent dust brush-off performance is provided.

Disclosed is a composite filler media. The composite filter media is formed from multiple layers of media material including a nanofiber media layer, where the layers are laminated, bound, or otherwise composited to each other. The composite filter media can comprise at least one nanofiber layer comprising polymeric media material having a geometric mean fiber diameter of about 100 nm to 1 m, and fibers configured in a gradient such that ratio of the geometric mean diameter of fibers at the upstream face of the nano fiber layer to the geometric mean diameter of fibers at the downstream face of the nano fiber layer is about 1.1 to 2.8, preferably about 1.2 to 2.4.

Disclosed are porous elements that include sintered polymeric particles. The polymeric particles can be formed of a thermoplastic composition that includes a polyarylene sulfide. The polymeric particles sintered to form the porous elements have a very narrow size distribution. The porous elements can maintain their functionality and morphology even when utilized in high temperature applications.