SOUND ABSORPTION STRUCTURE

PROBLEM TO BE SOLVED: To provide a sound absorption structure that is light-weighted and slim and has excellent sound absorption characteristics of a low frequency area in particular.SOLUTION: A sound absorption structure is composed of two or more laminated fiber layers. Total thickness in a layer...

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Bibliographische Detailangaben
Hauptverfasser:	MARUOKA YOSHIFUMI, OKUYAMA YUKINARI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR BRAIDING COTTON-WOOL FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS KNITTING LACE-MAKING LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS NON-WOVEN FABRICS PERFORMING OPERATIONS PHYSICS SOUND-PRODUCING DEVICES TEXTILES TRANSPORTING TRIMMINGS WADDING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a sound absorption structure that is light-weighted and slim and has excellent sound absorption characteristics of a low frequency area in particular.SOLUTION: A sound absorption structure is composed of two or more laminated fiber layers. Total thickness in a layer direction amounts to 8.0 mm or more. Nonwoven cloth disposed at a sound source side is polyethylene fiber and a DSC curve shows at least one endothermic peak in a temperature range of 140°C or over at a rate of temperature rise of 10°C/minute in differential scanning calorimetry (DSC) of the polyethylene fiber.SELECTED DRAWING: None 【課題】軽量で薄く、特に低周波数領域の吸音特性に優れた吸音構造体を提供する。【解決手段】本は発明の吸音構造体は、繊維層が二層以上積層されて成る吸音構造体であり、層方向全体の厚みが８．０ｍｍ以上であり、音源側に配置される不織布がポリエチレン繊維の示唆操作型熱量測定(ＤＳＣ)における昇温速度１０℃／分でのＤＳＣ曲線が１４０℃以上の温度領域に少なくとも１本の吸熱ピークを示す。【選択図】なし