摘要:
An electrostatic filter comprises a fibrous component including a mixture of wool and synthetic fibers and a resinous component including a perfluoroalkyl acrylate copolymer resin and a p-tert-butylyhenol formaldehyde resin, which resinous component is adhering to the fibrous component, both of the fibrous substrate component and the resinous component being in electrostatically charged conditions.
摘要:
A method of charging a nonwoven web of thermoplastic microfibers to provide electret filter media is provided. The method includes impinging on a nonwoven web of thermoplastic nonconductive microfibers capable of having a high quantity of trapped charge jets of water or a stream of water droplets at a pressure sufficient to provide the web with filtration enhancing electret charge and drying said web.
摘要:
A non-woven fine fibrous/micro fibrous filter material for aerosol filtration and personal safety aids, the fibrous material comprising a styrene/acrylonitrile copolymer and/or polystyrene, dissolved in esters such as ethyl acetate and butyl acetate which are relatively non-toxic. The material may be charged during manufacture with a permanent electret charge. The invention also relates to a method for making a fine fibrous filter material having homogeneous diameter fibres, using relatively low toxicity polymer solutions and by additional processing of the fibres using saturated solvent vapours at the fibre forming process zone.
摘要:
An oily mist resistant electret filter media is provided. The filter media comprises polypropylene electret fibers and a melt processable fluorochemical additive, said additive having a melt temperature of at least 250°C and a molecular weight of 500 to 2500.
摘要:
A filter of small dimensions and a large filtration area, in which one end portion of each of tubular filter elements, each of which is formed by spirally winding a filter medium consisting of a porous film of polytetrafluoroethylene having an average pore diameter of 0.1-5 µm and a small pressure loss and sandwiched by a pair of sheets of fiber of a thermally meltable synthetic resin, is fitted firmly in each of a plurality of through holes in a rigid support plate, the other end portions of these filter elements being closed.
摘要:
A filter of small dimensions and a large filtration area, in which one end portion of each of tubular filter elements, each of which is formed by spirally winding a filter medium consisting of a porous film of polytetrafluoroethylene having an average pore diameter of 0.1-5 mu m and a small pressure loss and sandwiched by a pair of sheets of fiber of a thermally meltable synthetic resin, is fitted firmly in each of a plurality of through holes in a rigid support plate, the other end portions of these filter elements being closed.
摘要:
A method for producing an electret filter, which methods comprises forming a film comprising a high molecular weight compound, optionally stretching the film, splitting the optionally stretched film to form split yarns, subjecting the split yarns to homo charging to obtain charged split yarns, and forming the charged split yarns into the electret filter.