Nitto-denko Corporation

Toyobo Co., Ltd.

Toyco Cloth Co., Ltd.

Atsushi Daimon

Masaaki Mori

Shiho Wada

Takashi Niki

Toshiki Yanagi

Youzou Yano

Kou Uemura

Shinichiro Inatomi

Hiroyasu Sakaguchi

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A proportion of areas occupied by the plurality of nodes on a surface of the first porous PTFE membrane is in the range of 1.5 to 3.0% and an average of the areas of the plurality of nodes is 200 &#x3bc;m2 or more.

Air filter medium, air filter pack, and air filter unit

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A contact angle of the first porous PTFE membrane with water is in the range of 154&#xb0; to 165&#xb0;.

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. The air filter medium () has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane. A thickness of the first porous PTFE membrane is in the range of 4 to 40 &#x3bc;m and a specific surface area of the first porous PTFE membrane is 0.5 m/g or less.

An air filter medium includes a first porous PTFE membrane and a second porous PTFE membrane. An average fiber diameter of fibers included in the first porous PTFE membrane is 0.24 to 0.45 &#x3bc;m, an average fiber diameter of fibers included in the second porous PTFE membrane is 0.04 to 0.23 &#x3bc;m, the air filter medium has a first main surface and a second main surface, and the first porous PTFE membrane and the second porous PTFE membrane are arranged so that an air flow moving from the first main surface to the second main surface passes through the first porous PTFE membrane and subsequently through the second porous PTFE membrane.

A resin-coated non-woven fabric is provide that may be welded through a high-frequency welder and may be remedied in hardness, and further may have a clear embossed pattern. A resin-coated non-woven fabric of the present invention comprises: a filament non-woven fabric that is of a thermocompression-bondable type, is made of a polyethylene terephthalate and has a weight of 50 to 150 g/m; and a resin coat layer positioned over one surface of the filament non-woven fabric and having a coating amount of 40 to 150 g/mafter dried; wherein the resin coat layer contains 10 to 45% by mass of a vinyl chloride unit and 30 to 55% by mass of a (meth)acrylic acid ester unit, and further a surface of the resin coat layer has an embossed pattern.

Resin-coated non-woven fabric

A ventilation unit (A) includes: a ventilation member () configured to be attached to an opening () of a housing (), the ventilation member () including a water-proof gas-permeable membrane () for covering the opening (); a sealing member () configured to seal a gap between the housing () and the ventilation member (); and an annular partition wall member (A) defining an inner space in which the ventilation member () is fitted. The partition wall member (A) is configured to keep in contact with the housing (), and blocks a clearance formed outside the sealing member () and between a peripheral portion of the ventilation member () and the housing () when the ventilation member () is attached to the opening () of the housing ().

Ventilation unit

A ventilation unit () includes: a ventilation member () configured to be attached to an opening () of a housing (), the ventilation member () including a water-proof gas-permeable membrane () for covering the opening (); a sealing member () configured to seal a gap between the housing () and the ventilation member (); and a washer () configured to be pressed against the housing () by the ventilation member () around the sealing member (). The washer () blocks a clearance formed outside the sealing member () and between a peripheral portion of the ventilation member () and the housing () when the ventilation member () is attached to the opening () of the housing ().

Growing community of inventors

Osaka, Japan

Atsushi Daimon