| 摘要 |
PROBLEM TO BE SOLVED: To provide a filter having high collecting efficiency of dusts or the like, high capacity holding a large amount of dusts or the like slowly raised ventilation resistance and used for a long time. SOLUTION: Melt-blown unwoven cloth 1 is made of extra fine fiber having 7 to 15μm fiber diameter manufactured by melt-blowing a synthetic resin. A mixed web 2 is manufactured by opening and mixing the melt-blown unwoven cloth 1, fiber such as cut cloth and electrifying processed fiber obtained by subjecting wool and a synthetic fiber having >=15μm fiber diameter to resin processing and then to mechanical secondary processing and then folding by a cross layer system. The melt-blown unwoven cloth 1, the mixed web 2 and a prefilter 3 made of spunbonded unwoven cloth are successively laminated to form the filter.
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