Acoustic and thermal shield for a motor vehicle
AssigneeTreves Products, Services & Innovation
InventorsAlicia Lecomte, Olivier Vitrant, Marc Pothier, Stéphane Ribes
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Abstract
An acoustic and thermal shield for a motor vehicle, including a porous shell based on fibers bound together by a binding agent and a spring layer based on elastically compressible polyurethane foam, the porosity of the shell being such that the foam is able to create a sealed skin on the underside of the shell, which fibers consist of two types: thick reinforcing fibers in an amount of 25 to 40% by weight of the shell and fine fibers in an amount of 15 to 35% by weight of the shell, the bonding agent being formed by fusible bonding fibers in an amount of 35 to 50% by weight of the shell, so that substantially no foam penetrates the thickness of the shell.
Claims7
An acoustic and thermal protective shield for a motor vehicle, said shield comprising:
- a porous shell based on fibers bound together by a bonding agent,
- a spring layer based on elastically-compressible polyurethane foam,
- said shield further having the following features:
- said spring layer is obtained by reaction injection molding (RIM), said layer overmolding a back face of said shell,
- said shell having a porosity enabling said foam to create a sealed skin on the side of said face,
- said fibers including two types of fibers:
- thick reinforcing fibers in an amount from 25 to 40% by weight of said shell, and
- fine fibers in an amount from 15 to 35% by weight of said shell,
- the bonding agent formed by fusible bonding fibers in an amount from 35 to 50% by weight of said shell, so that said shell is substantially free of foam penetration across its thickness.
Dependencies are inferred from the claim text.