Nichias Corporation

Tatsuro Miki

Koji Iwata

Ken Yonaiyama

Hideki Kitahara

Kazuki Soeda

Tetsuya Sasakawa

Kazuhiro Kikuchi

Kazutaka Murayama

Keiji Tsukahara

Takahito Mochida

Daisuke Ando

Hikari Sasaki

Yuuma Tomitsuka

Ikuma Fujisawa

A soundproof member includes: a first elastic porous body layer; a first film layer; a second elastic porous body layer; and a second film layer, the layers arranged in the stated order from a sound source (S) side, wherein the first and second elastic porous body layer each have: a thickness of 0.5 mm or more and 10 mm or less; a bulk density of 45 kg/mor more and 550 kg/mor less; and a Young's modulus of 7,000 Pa or more and 28,000 Pa or less, and wherein a total (L+L) of a ratio (L) of the thickness L(mm) of the first elastic porous body layer to a viscous characteristic length Λ(μm) thereof and a ratio (L) of the thickness L(mm) of the second elastic porous body layer () to a viscous characteristic length Λ(μm) thereof is 0.11 or more.

Soundproof member

A soundproofing material including a porous body having a cell structure and including inorganic fibers other than asbestos, wherein an average cell diameter is more than 300 &#x3bc;m and 1000 &#x3bc;m or less, a bulk density is 0.007 to 0.024 g/cm, and a flow resistivity is 170,000 to 2,000,000 Ns/m.

Soundproofing material

Inorganic fibers including the following composition, SiO, AlO, MgO and CaO being main components, and the inorganic fibers being produced by a melting method: SiO: 3.0 wt % or more and less than 48.0 wt %, AlO: more than 20.0 wt % and 80.0 wt % or less, MgO: 1.0 wt % or more and 50.0 wt % or less, CaO: 1.0 wt % or more and 50.0 wt % or less, and FeO: 0.0 wt % or more and less than 1.0 wt %.

Biosoluble inorganic fiber

Inorganic fibers including the following composition, SiO, MgO and CaO being main components: SiO: 73.6 wt % to 85.9 wt %, MgO: 9.0 wt % to 21.3 wt %, CaO: 5.1 wt % to 12.4 wt %, AlO: 0 wt % or more and less than 2.3 wt %, and FeO: 0 wt % to 0.50 wt %.

Bio-soluble inorganic fiber

Growing community of inventors

Tokyo, Japan

Tatsuro Miki