Mitsui Chemicals Asahi Life Materials Co., Ltd.

Asahi Kasei Kabushiki Kaisha

Chie Okamura

Kazufumi Kato

Rumina Obi

Eiji Shiota

Yasuo Nakanishi

Shinya Yamamuro

Takuya Matsumoto

Yusuke Yamada

Takashi Komatsu

Tomoya Tanaka

Junki Saito

Yasushi Isono

Provided are a non-woven cloth and a layered non-woven cloth that are preferred as a skin material for a composite sound-absorbing material, which has excellent moldability and exceptional shape stability, and with which it is possible to achieve an adequate sound-absorption effect even in thin low-weight regions.

Nonwoven fabric, layered nonwoven fabric comprising the nonwoven fabric, and composite sound-absorbing material using them as skin material

Provided is a composite sound-absorbing material that can exhibit sound absorption properties in a broad range of low frequencies, intermediate frequencies, and high frequencies even in a low-basis-weight region having low thickness. The composite sound-absorbing material according to the present invention is configured from two or more layers including a base material and a skin material, the skin material being positioned on the outermost layer, wherein the composite sound-absorbing material is characterized in that the ratio (skin material:base material) of the surface area (m/m) per unit area of the skin material and the surface area (m/m) per unit area of the base material is at least 1:5 and less than 1:40.

Composite sound-absorbing material

The present disclosure provides: a biodegradable nonwoven fabric for thermoforming, the biodegradable nonwoven fabric being composed of a fiber of a polylactic acid-based polymer, and having a basis weight of 20-300 g/m, preferably, a biodegradable nonwoven fabric characterized by being composed of a long fiber of a polylactic acid polymer, having an MD-direction elongation of 50% or more at 120&#xb0; C., and having an MD-direction dimensional change rate of &#xb1;4% or less at 80-140&#xb0; C. as determined by thermomechanical analysis; a method for producing a molded body by using said biodegradable nonwoven fabric; and a method for molding a biodegradable beverage extraction container, the method being characterized in that the molded body has an MD-direction elongation change rate of 4% or less, as determined by thermomechanical analysis (TMA) under a load of 0.05 N/2 mm at 30-100&#xb0; C.

Method for producing a biodegradable nonwoven fabric

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Tokyo, Japan

Chie Okamura