Rieter Technologies Ag

Hameed S Khan

James H Fisher

Peter Ehrler

Burton J Price

Steven D Tessendorf

Desmond O'Regan

An ultra light, noise reducing composite () comprises an acoustically transparent, light weight film () between an underlay layer () and an air flow resistance layer (). This composite allows to easily tune the acoustic properties by balancing the absorption and sound transmission behaviour of the composite (). This air flow resistance layer () has an air flow resistance of between 500 Ns/m3 and 10,000 Ns/m3 and an area mass between 200 g/m2 and 3,000 g/m2. The underlay layer () has a stiffness value in the range between 100 Pa and 100,000 Pa. The light weight film () may consist of a synthetic foil and preferably has a thickness of 0.01 mm.

Ultralight trim composite

The present invention concerns an automotive protective mat (), also known as throw in mat or protective mat. This mat comprises a microporous stiffening layer () (acoustical membrane). This layer may be composed of several sheets. The overall air flow resistance is between 500 Ns/m&#x2013;4000 Ns/m. It is essential for this mat () that it is hydrophobic. In order to achieve an enhanced acoustical effectiveness a decoupling layer () is foreseen between the microporous stiffening layer () and the vehicle floor (). This decoupling layer might be incorporated in the mat () or constituted by the underlaying carpet or sound absorber of the vehicle floor. Further layers or sheets such as adhesive layers, non skid layers, face fabrics or carpets and/or loft layers can be added to the claimed mat.

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Crown Point, IN, United States of America

Hameed S Khan