Abstract:
An illustrative filter includes an electret material, which has a long-lasting electric charge, that is at least partially coated or covered with a conductive layer. An optional insulation layer may be disposed over at least part of the conductive layer. If the electret material has a positive charge, then the filter attracts particles with a negative charge, and vice versa. The filter adsorbs the attracted particles until it becomes saturated with particles, at which point the conductive layer is charged to have a polarity that is opposite the built-in polarity of the electret and that matches the polarity of the adsorbed particles. The charged conduction layer repels the adsorbed particles from the filter, cleaning the filter for continued use.
Abstract:
An air purifier having an electret module for capturing airborne particles, the electret module including an electret element disposed within a housing and an adhesive layer coupled to the housing to capture airborne particles, whereby the static field of the electret attracts the airborne particles, which subsequently adhere to the adhesive layer.
Abstract:
A method of making a fluorinated fibrous web, which method includes providing a nonwoven web (22) that contains polymeric fibers, creating a plasma that contains fluorine atoms at a first location (14), and contacting the nonwoven web with products from the plasma at a second location (26) remote from the first location (14). The method avoids exposure of the web to the plasma and hence expands the manufacturing processing window. Webs so fluorinated have a different C 3 F 4 H + to C 2 F 5 + ratio when compared to locally fluorinated webs having similar levels of surface fluorination. The remote fluorinated webs can be subsequently charged electrically to provide a good performing electret filter (40) suitable for use in an air purifying respirator (30). Webs fluorinated in accordance with this invention also may exhibit good performance even after being "aged" at high temperatures.
Abstract:
La présente invention propose un procédé et un dispositif de séparation électrostatique de matériaux isolants granulaires performants polyvalents, économes en énergie et s'adaptant facilement aux conditions atmosphériques ambiantes et aux propriétés physico-chimiques des granules à séparer. L'invention a pour objet un procédé comprenant les étapes suivantes : a) injection, entre deux électrodes dans une chambre de séparation délimitée par des parois et munie d'une entrée et d'une sortie d'air, d'un courant d'air; b) introduction du mélange de granules de matériaux différents, dans le courant d'air; c) contrôle du courant d'air, pour que les granules lévitent dans le courant d'air selon un régime turbulent et se chargent électriquement par contacts entre eux et/ou avec les parois de la chambre de séparation; d) génération d'un champ électrique entre les deux électrodes, sensiblement perpendiculairement au sens du courant d'air, tels que les granules chargés à l'étape c), se déplacent, soit dans le sens du champ électrique s'ils sont chargés positivement, soit en sens opposé si leur charge est négative; e) adhésion des granules chargés à la surface des électrodes; f) évacuation et collecte des granules adhères à chaque électrode.
Abstract:
A differential absorption spectrum for a reactive gas in a gas mixture can be generated for sample absorption data by subtracting background absorption data set from the sample absorption data. The background absorption data can be characteristic of absorption characteristics of the background composition in a laser light scan range that includes a target wavelength. The differential absorption spectrum can be converted to a measured concentration of the reactive gas using calibration data. A determination can be made whether the background composition has substantially changed relative to the background absorption data, and new background absorption data can be used if the background composition has substantially changed. Related systems, apparatus, methods, and/or articles are also described..
Abstract:
This invention relates to the field of connectors used to connect gas sources to apparatus for the administration or other use of gas or mixtures of gases, and more specifically to filters used to remove biological contaminants that might be colonized with the pressurized containers used in gas administration for respiratory support of a user or patient or other applications where biological contamination is not desired.
Abstract:
The invention is an air filter for reducing the amount of particles in air. In the preferred form, the particles are odour particles. The air filter comprises two spaces disposed between an air inlet and an air outlet. Odorous air is drawn into the air filter and pre-treated in a first space, having air flow baffles and jets which both agitate and charge the air by a process of triboelectrification. In the second space the airstream impinges upon a number of spaced-apart baffles or structured layers. The odour particles in the air are attracted to the surfaces of the baffles and are removed by the action of the water flow. The air filter of the present invention can treat air from installations such as agricultural operations, air from apartment buildings, air from restaurants, factories and other industrial facilities, vehicle exhaust system and effluent ponds and is also applicable to removing other particles types such as pollen.