This paper introduces the application of polytetrafluoroethylene in bag filter bag. Polytetrafluoroethylene resin can be made of staple fiber, filament and sewing thread and biaxially oriented microporous membrane for filter media and filter bag; emulsion can also be used for the production of short fiber, filament and filter impregnation and coating sort out.
With the development of bag-type dust removal equipment, the role of high-temperature and corrosion-resistant filter material and dust-proof filter bag has become more and more obvious. Various organic and inorganic high-temperature filter materials, dust bag technology has made great progress, And achieved obvious social and economic benefits. One of the role of polytetrafluoroethylene resin and emulsion contributed. The application of almost covered the high-temperature filter and dust bag production and finishing the entire process. Such as polytetrafluoroethylene fiber, filament, sewing thread; Teflon filament fabric, needle felt, Teflon microporous membrane coated filter material, Teflon emulsion impregnation treatment and coating finishing. Teflon with its excellent performance by the filter and dust filter bag production units widely recognized, has become the media and related companies competing research and development of the object.
PTFE coated filter media
Membrane filter is the PTFE porous membrane and ordinary filter (needle felt, woven, non-woven fabrics, etc.) after the composite filter. The main indicators of the membrane filter compound for the fastness, permeability and filtration efficiency and resistance. Coated filter performance is mainly affected by three factors, one PTFE membrane, the second is the composite process and equipment, and the third is the filter itself. Pre-treatment of the filter with the filter Note the following:
Needle felt at room temperature, the surface to use light burning or burning in the treatment, the key requirement is to be uniform surface treatment. Avoid burned or singeing a light weight, crater different; surface calendering, especially the depth of calendering acupuncture felt does not apply to thermal laminating film.
Aramid and organic high temperature needle felt, can not singeing too heavy, to use the surface of light burning treatment. Such as singeing too heavy, after the mulching panel knot, filter hard, affecting the use. For hot lamination, PTFE impregnation is required.
Fiberglass products, one wax, oil, etc. to remove the clean, the base fabric to be soft, otherwise the impact of film fastness and cover easy to crack. Second, PTFE emulsion treatment should be uniform, in the drying and baking process to prevent swimming, and PTFE emulsion to have a certain content, especially in the filter surface to have a certain amount. .
In addition, the filter of conventional physical defects is also affecting the quality of coated media filter basis, such as broken wire, broken weft, grease, dirt, thin dense road, edge loose side tight (lotus leaf edge), hole , Density varies, the thickness of different surface treatment is not the net. Therefore, the membrane filter, the filter, PTFE membrane, composite equipment and technology to produce the perfect combination of qualified coated media.
