Ultra-light sound insulator

The ultra-light sound insulator of the present invention is composed of a felt single sheet having a vehicle interior side surface and a vehicle exterior side surface and being thermoformed of cotton fibers and binder fibers which are tangled and contacted and jointed to each other in a random manne...

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Bibliographische Detailangaben
1. Verfasser:	ISHIKAWA MASAKI,ISHIKAWA YOUHEI,MATSUYAMA SOHEI,MORI HIDEYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	ACOUSTICS ACOUSTICS NOT OTHERWISE PROVIDED FOR METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING,NOISE OR OTHER ACOUSTIC WAVES IN GENERAL MUSICAL INSTRUMENTS PERFORMING OPERATIONS PHYSICS SOUND-PRODUCING DEVICES TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR
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Beschreibung
Zusammenfassung:	The ultra-light sound insulator of the present invention is composed of a felt single sheet having a vehicle interior side surface and a vehicle exterior side surface and being thermoformed of cotton fibers and binder fibers which are tangled and contacted and jointed to each other in a random manner. The ratio of the stiffness of the vehicle interior side surface to that of the vehicle exterior side surface is set to be in a range of 1.1 to 10. The single sheet has an area of gradually-decreasing stiffness that spreads over at least one part of the area between the vehicle interior side surface and the vehicle exterior side surface. The area of gradually-decreasing stiffness has a stiffness distribution pattern in which the stiffness decreases gradually from the vehicle interior side surface toward the vehicle exterior side surface with respect to the direction perpendicular to the vehicle exterior side surface.