| 摘要 |
PURPOSE:To obtain an inexpensive filter material having high removal efficiency, by adsorbing and removing particles having a small particle size by the electrostatic adsorbing action of a perforated material to which a charged substance was adhered. CONSTITUTION:In using a fiber as the constitutional material of a perforated material 3, a polyester fiber 1 with a thickness of 0.1 denier and a polyester fiber with a thickness of 1.1 denier melted at about 200 deg.C are mixed in a ratio of 8:2 and the resulting mixture is formed into the perforated material 3 having a basis wt. of 50-150g/m<2> by a papermaking process and heated to mutually adhere the fibers. As a charged substance, aluminium hydroxide, iron oxide or a high-molecular flocculant are used. In the case aluminum hydroxide, the perforated material 3 is impregnated with a 1-10% aluminum chloride solution and, after the impregnated one is dehydrated so as to leave about 200% of said slution, neutralization treatment is applied thereto by sodium carbonate to form aluminum hydroxide particles which are, in turn, adhered to the surfaces of the fibers by the charge thereof.
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