PROBLEM TO BE SOLVED: To provide an inexpensive composite air filter having a sterilization function, a deodorization function, and a particulate collecting function.SOLUTION: The inexpensive composite air filter having a sterilization function, a deodorization function, and a particulate collecting function includes a first surface layer of nonwoven fabric mainly composed of synthetic fiber, a second surface layer of nonwoven fabric mainly composed of synthetic fiber, and a functional intermediate layer inserted between the first and second surface layers. The functional intermediate layer includes a synthetic resin nonwoven fabric layer composed of copper-containing synthetic resin fiber to which a binder is attached, an active carbon powder-containing synthetic resin foam layer, and a filter layer having a front surface and a rear surface to which zinc oxide powder is attached, which are sequentially laminated in the flow direction of gas.COPYRIGHT: (C)2014,JPO&INPIT【課題】殺菌機能、脱臭機能および微粒子の捕集機能を有した廉価な複合エアフィルタを提供する。【解決手段】合成繊維を主体とした不織布からなる第1の表層と、合成繊維を主体とした不織布からなる第2の表層との間に、機能性中間層を挟み込み、この機能性中間層として、銅を含む合成樹脂繊維に粘着剤が付着した合成樹脂不織布層と、活性炭粉末を含む合成樹脂フォーム層と、表裏面に酸化亜鉛粉末が付着したフィルタ層とを気体の流れる方向に向かって順次積層したものを採用した。これにより、殺菌機能、脱臭機能および微粒子の捕集機能を有した廉価な複合エアフィルタを提供できる。【選択図】図1
