Daikin Industries, Ltd.

Nippon Muki Co., Ltd.

Osamu Kitayama

Hitoshi Niinuma

Jun Morita

Makoto Kobayashi

Satoshi Hara

Tatsumi Sakano

Li Bao

Shiro Hayashi

Norikazu Shinya

Tomoyuki Hasegawa

Hirokazu Izumiya

A filter medium for an air filter collecting dust in an air flow has a principal collection layer including a porous polytetrafluoroethylene film. A surface of the filter medium is provided with a plurality of embossed projections. Preferably, a processed filter medium maintains a zigzag shape by pleating an unprocessed filter medium to create mountain folds and valley folds. Preferably, an air filter unit includes such a processed filter medium and a frame body holding the processed filter medium.

Filter medium for air filter and filter unit

The invention provides a filter pack of which the mass is not increased, and moreover, the effective filter medium area is not reduced, and of which the pressure drop is sufficiently low, and the strength is sufficiently high, and an air filter using this. A pleated air filter pack is configured in such a way that dot embossed projections are provided on front and rear surfaces of a filter medium made of a non-woven fabric, the filter medium is folded in zigzag shape along creases of pleats, and the opposing embossed projections are brought into contact with each other when the filter medium is folded, thus maintaining the intervals between the filter media.

Pleated air filter pack and air filter using same

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Yuki, Japan

Osamu Kitayama