| abstract |
PURPOSE: To reduce filtering resistance while holding the void ratio of a filter material, by forming glass micro-wool having a specific fiber diameter into a sheet along with an org. composite fiber containing a low, m.p. component according to a papermaking process before drying. n CONSTITUTION: A fiber mixture consisting of 10W80wt% of glass micro-wool with an average fiber diameter of 0.1W3μm, for example, 10W30wt% of an org. composite fiber containing a low m.p. component as a binder and, for example, 30W60wt% of a usual org. or inorg. fiber is formed into a sheet according to a wet papermaking process. The fiber diameter of the binder composite fiber is pref. 15W30μm and a polymer combination comprises, for example, polypropylene and polyethylene or an ethylene/vinyl acetate copolymer, polyester and polyamide, polyester and polypropylene or polyester and copolyester. After the sheet is formed, it is dried, for example, at 170W180°C for 15W30min in air to obtain a filter material with pressure loss of 20W30mmHg and permeability of 1.9×10 -4 W5.2×10 -4 . n COPYRIGHT: (C)1985,JPO&Japio |