Asahi Kasei Fibers Corporation

Nitto-Denko Corporation

Asahi Kasei Kabushiki Kaisha

Norihisa Matsuo

Minoru Yoshida

Hiroki Fujioka

Mieko Nishi

Ikuo Ueno

Hirotoshi Ishizuka

Nobuhiro Inokuma

An object of the present invention is to provide a nonwoven fabric having high tensile strength and high tear strength. The laminate nonwoven fabric of the present invention is a laminated nonwoven fabric obtained by thermally press-contacting a thermoplastic continuous fiber layer as an outer layer with both surfaces of an interlayer, wherein the ratio (F1/F2) between the average oblateness (F1) of the thermoplastic continuous fiber present on the surface side and the average oblateness (F2) of the thermoplastic continuous fiber present on the inner side is 1.20 or more.

Laminated nonwoven fabric

An object of the present invention is to provide a composite membrane support composed of a dry process thermoplastic resin filaments nonwoven fabric having a significantly high uniformity to enable formation of a porous layer free from strike-through or a defect such as pinhole at the film formation, producing no skin layer defect at the formation of a skin layer, and being excellent in the mechanical strength and dimensional stability at high temperatures, and a high-performance composite membrane and a composite membrane element each using the composite membrane support. The composite membrane support of the present invention is a laminate dry process thermoplastic resin filaments nonwoven fabric comprising three or more layers containing at least a meltblown fiber layer as an interlayer and spunbond fiber layers on both sides of the interlayer, wherein the average value of air flow resistance is from 2.0 to 30.0 kPa&#xb7;s/m and the ratio between the average value and the standard deviation of air flow resistance is 0.6 or less.

Composite membrane support and composite membrane using the same

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Tokyo, Japan

Norihisa Matsuo