Toray Industries, Inc.

Hitachi-omron Terminal Solutions, Corporation

Hisato Matsui

Minoru Kadowaki

Riichi Kato

Wataru Gouda

Yasunari Niioka

Yuji Matsuo

Hideaki Toyama

The present invention aims to provide a multi-layer sheet with excellent electromagnetic wave shielding properties. The multi-layer sheet includes an alternating multilayer unit with five or more A layer and B layer alternately laminated, in which the electromagnetic return loss at the peak top in the peak of return loss spectrum with the highest return loss at the peak top is 5 dB or more in a chart of the return loss in the multi-layer sheet.

Laminated sheet

The laminate film is a laminate including 51 or more layers in which an A layer mainly composed of a thermoplastic resin A and a B layer mainly composed of a thermoplastic resin B, which is different from the thermoplastic resin A, are alternately laminated. A transmission spectrum X is obtained by exposing the film to linear polarized light (X wave) that oscillates in the alignment direction of the film over a range of wavelengths from 300 to 900 nm. A transmission spectrum Y is obtained by exposing the film to linear polarized light (Y wave) that oscillates in the direction perpendicular to the alignment direction of the film over a range of wavelengths from 300 to 900 nm. The area Amax (nm·%) of the largest region among regions enclosed by the transmission spectrum X and the transmission spectrum Y is 150 to 1500.

Laminate film

Growing community of inventors

Otsu, Japan

Hisato Matsui