In a method for producing a filter medium, at least one substrate layer of a nonwoven comprising cellulose fibers and/or synthetic polymer fibers is provided and a fiber layer of polymer fibers is deposited on the at least one substrate layer. Prior to depositing the fiber layer, a solvent is applied to the at least one substrate layer, wherein a material of the substrate layer and/or a material of the fiber layer is soluble in the solvent. A filter medium produced by the method has material-fused connections at crossing points of the polymer fibers and/or cellulose fibers of the substrate layer with the polymer fibers of the fiber layer.

The present invention relates to a mask comprising a mask body for covering a wearer's face and wearing straps coupled to both sides of the mask body, the mask body comprising a filter member having: a support layer having a mesh structure; and a filter coating layer formed on the outer surface of the support layer and for filtering contaminants, wherein the filter coating layer is formed from a microfiber web eletrospinned on the support layer.

The disclosure relates to seamless manufacturing processes for 3-dimensional waterproof and breathable porous polymer membranes by spraying, dip-coating or painting a substrate with a dispersion having polymer, coated or non-coated particles and diluent and removing the particles by dissolution thus creating porosity after the 3D coating/shaping. The disclosure further relates to dispersions to obtain such membranes, to polymer membranes obtained, to shaped articles containing such membranes; to the use of such membranes, shaped articles and intermediates.

The invention relates to a respiratory protection mask made of polyvinylidene fluoride and to a method for manufacturing said mask. The invention also relates to a method for reconditioning said mask. The invention also relates to a method for recycling this respiratory protection mask.

A filter assembly comprises a filter housing defining an internal volume having an inner cross-section defining an inner cross-sectional distance, the filter housing having a base and a sidewall. A filter element is disposed within the internal volume. The filter element comprises a filter media pack at least a portion of which has an outer cross-section defining an outer cross-sectional distance that is substantially equal to the inner cross-sectional distance of the internal volume of the filter housing. A support structure is coupled to at least one longitudinal end of the filter media pack.

A head garment is made of elastically stretchable fabric configured to fit over and surround the head of a wearer and conform substantially to the shape of the wearer's head. The head garment has an eye opening positioned to allow the wearer to see therethrough, and a protective eye shield completely covering the eye opening. A multi-layer filter portion is configured to cover the wearer's mouth and at least a lower part of the wearer's nose and has three or more filter layers for filtering air during breathing. Additional filter layers may be added to the multi-layer filter portion to enhance or modify the filtering properties. The multi-layer filter portion may be configured as a removable filter pack that can be removed and replaced by other filter packs having different filtering properties.

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 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.

An antibacterial deodorizing mask including titanium dioxide according to the present disclosure includes: a mask body configured to surround at least one of a wearer's mouth and nose; and a pair of ear loops provided at both sides of the mask body so as to be hung on the wearer's ears and each having both ends coupled to upper and lower portions of the mask body, respectively, in which the mask body includes titanium dioxide particles having an average particle diameter D50 of 0.2 mm to 2 mm.

An improved impression wheel for use within respiratory face mask manufacturing machines that includes a first, second, and third series of spaced helicoidal teeth shaped and adapted to more efficiently and securely interconnect respective layers of respiratory face masks.