Toyo Boseki Kabushiki Kaisha

Nippondenso Co., Ltd.

Yatsuhiro Tani

Satoshi Takase

Susumu Ohmori

Hideki Komagata

Toshiaki Hayashi

Syoji Tokuda

An electret filter formed by laminating a plurality of network electret film-split fiber fleeces having a different mesh size. It exhibits a high collecting efficiency with a very small pressure loss and without any appreciable fiber dropping, or any channeling.

Electret Filter

Flexible tubular filtering material

An electret sheet comprises a porous sheet made of a dielectric polymer and at least one solid material selected from the group consisting of organic materials, inorganic materials, and metallic materials, the porous sheet having the material spaced at various intervals and a method for the manufacture of the said electret sheet.

Electret sheet and a method for the production of the same

Method for the production of an electret sheet

A filter for removing dust from fluids, which comprises fibers bonded each other with a binder and hot-pressed, having a fiber density of 0.01 to 0.1 at the fluid inlet side and a fiber density of 0.05 to 0.5 at the fluid outlet side with a continuous fiber density gradient and having a uniform distribution of fiber material in direction of thickness, and a process for the production thereof. The filter is particularly useful as an air filter for automobiles or air conditioners.

Filter and process for the production thereof

A filter for removing dusts from fluids, which comprises fibers bonded each other with a binder and/or hot-pressed, having a fiber density of 0.01 to 0.1 at the side of inflow of fluid to be treated and a fiber density of 0.05 to 0.5 at the side of outflow of the fluid with a continuous fiber density gradient and having a uniform distribution of fiber material in direction of thickness, and a process for the production thereof. The filter is particularly useful as an air filter for automobiles or air conditioner.

Growing community of inventors

Ohtsu, Japan

Yatsuhiro Tani