Importance

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Abstract

A molded ceiling material for vehicles having a substrate layer containing a porous core layer, a surface member and a ventilation control mechanism to control the ventilation volume that is vented from a cabin side of the surface member to the substrate layer. Sound generated in the vehicle cabin is absorbed by the substrate layer through the ventilation control mechanism. That is, the molded ceiling material is equipped with sound-absorption performance for sound from the cabin side of the vehicle. If the sound-absorption rate is increased, the ventilation volume to the substrate layer is increased. If the sound-absorption rate is decreased, the ventilation volume to the substrate layer is reduced. The sound-absorption rate of the molded ceiling material can be controlled regardless of the thickness of the substrate layer. Consequently, the molded ceiling materials for vehicles can be provided with sound-absorption performance corresponding to the sound-absorption characteristics of the vehicle.

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First Claim