The invention relates to a filtering material permeable to air and impermeable to oral, nasal and/or ocular human liquid aqueous excretions, comprising at least one bundle, referred to as a hydrophobic bundle, of at least two hydrophobic sheets which are superimposed and each formed by porous paper, having a gsm substance less than 30 g/m.sup.2, each hydrophobic sheet being formed by cellulose fibres, referred to as cross-linked cellulose fibres, which are connected to each other by hydrogen bonds and by covalent bonds which are formed with at least one group of cross-linking atoms, characterised in that at least some of the hydroxyls of the cross-linked cellulose fibres which are not engaged in hydrogen bonds and which are accessible to the gases form a covalent bond with an acyl group with a hydrophobic chain.

The invention relates to a filtering material permeable to air and impermeable to oral, nasal and/or ocular human liquid aqueous excretions, comprising at least one bundle, referred to as a hydrophobic bundle, of at least two hydrophobic sheets which are superimposed and each formed by porous paper, having a gsm substance less than 30 g/m.sup.2, each hydrophobic sheet being formed by cellulose fibres, referred to as cross-linked cellulose fibres, which are connected to each other by hydrogen bonds and by covalent bonds which are formed with at least one group of cross-linking atoms, characterised in that at least some of the hydroxyls of the cross-linked cellulose fibres which are not engaged in hydrogen bonds and which are accessible to the gases form a covalent bond with an acyl group with a hydrophobic chain.

A filter system for adsorbing an odor of a gas flow in an industrial process includes a filter module (1) with a layer (11) containing active adsorbent (3). The layer (11) includes a plurality of active adsorbent containing permeable bags (2) arranged in close proximity to each other.

The present invention relates to the use of an ion exchanger for the removal and/or reduction of biological contaminants, such as viruses, bacteria and fungal spores, in gases and gas streams, such as room air and breathing air, and a corresponding method. In certain embodiments, the ion exchanger is a cation exchanger partially or substantially completely loaded with H.sup.+ ions or an anion exchanger partially or substantially completely loaded with OH.sup.− ions. Additionally or alternatively, the ion exchanger may be loaded with transition metal ions, such as titanium, copper and/or silver ions.

The present invention relates to the use of an ion exchanger for the removal and/or reduction of biological contaminants, such as viruses, bacteria and fungal spores, in gases and gas streams, such as room air and breathing air, and a corresponding method. In certain embodiments, the ion exchanger is a cation exchanger partially or substantially completely loaded with H.sup.+ ions or an anion exchanger partially or substantially completely loaded with OH.sup.− ions. Additionally or alternatively, the ion exchanger may be loaded with transition metal ions, such as titanium, copper and/or silver ions.

A shoe care device processes shoes by circulating air. The shoe care device includes an inner cabinet that has an accommodation space configured to accommodate shoes therein, an inlet defined at a first portion of the accommodation space and configured to supply air to the accommodation space, and an outlet defined at a second portion of the accommodation space and configured to suction air from the accommodation space. The shoe care device includes an air supplier that is disposed at the lower portion of the inner cabinet and includes a connection path configured to provide air to the accommodation space to circulate the air between the inlet and the outlet, and a dehumidifying material disposed at the connection path. The dehumidifying material is disposed at an upper end of the air supplier, and an upper surface of the dehumidifying material is exposed through a bottom of the inner cabinet.

A shoe care device processes shoes by circulating air. The shoe care device includes an inner cabinet that has an accommodation space configured to accommodate shoes therein, an inlet defined at a first portion of the accommodation space and configured to supply air to the accommodation space, and an outlet defined at a second portion of the accommodation space and configured to suction air from the accommodation space. The shoe care device includes an air supplier that is disposed at the lower portion of the inner cabinet and includes a connection path configured to provide air to the accommodation space to circulate the air between the inlet and the outlet, and a dehumidifying material disposed at the connection path. The dehumidifying material is disposed at an upper end of the air supplier, and an upper surface of the dehumidifying material is exposed through a bottom of the inner cabinet.

The present invention relates to an activated carbon sheet, and particularly relates to an activated carbon sheet for air purification comprising activated carbon, which is suitable for removing volatile organic compounds in the passenger compartment of an automobile or the like. An object of the present invention is to provide a sheet that is excellent in toluene adsorption capacity and flame retardancy. An activated carbon sheet for air purification comprising an activated carbon fiber, granular or powdered activated carbon, and a fibrillated fiber, wherein a mass (g/m.sup.2) of the activated carbon fiber is 5 g/m.sup.2 or more, a pressure loss as measured by a method set forth below is 150 Pa or less, and a burn distance as measured by the FMVSS 302 burning test is 51 mm or less: <pressure loss test method> the method is conducted in accordance with JIS B 9927:1999 “Appendix (Standard) Cleanroom—Air filters—Test methods”, 3.2 “Pressure Loss Test” as follows: a piece of the activated carbon sheet cut in the form of a circle with a diameter of 110 mm is used as a measurement sample; air is sucked though the measurement sample at a linear velocity of 0.1 m/s, and a difference in static pressure between an upstream side and a downstream side of the activated carbon sheet is measured with a differential pressure gauge; and figures up to the one's place of the measured value are used as significant figures.

Disclosed is a photocatalyst filter module including: a housing having an inner space opened in a back-and-forth direction so that fluid passes therethrough; a partition for forming a plurality of photocatalyst accommodation spaces by partitioning the inner space; a photocatalytic ball accommodated in the photocatalyst accommodation space; a mesh-shaped cover unit attached to the front and the rear of the housing to prevent the photocatalytic ball from being separated; and a light source unit provided adjacent to the rear of the housing.

An object of the invention is to provide a deodorizing filter superior in air-permeability as well as in deodorizing performance with respect to an unpleasant malodorous gas. A further object is to provide such a deodorizing filter and a deodorizing mask that do not have an unpleasant odor in themselves, or even after storage in a hermetically closed environment do not develop unpleasant odor or discoloration, and may be used comfortably. A deodorizing filter for a mask of the invention is provided with 2 or more layers of deodorizing fiber layers including a fiber and a chemisorption-type deodorizer, in which the deodorizing fiber layer contains a polyethylene resin fiber, and the thickness of the deodorizing fiber layer is from 0.15 to 0.4 mm, and the basis weight of the deodorizing fiber layer is from 20 to 45 g/m.sup.2.