Improved method for producing a lightweight,...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 44/04 (2006.01) B60R 13/08 (2006.01)

Patent

CA 2643551

The invention relates to a method for producing a lightweight, sound-insulating covering (1'') for a body part of a motor vehicle, in particular a lightweight front wall covering, and to a covering (1'') of this type. The covering (1'') is produced as a foamed, sound-absorbing moulded part in a single-stage operation by injection of a reaction mixture, which contains polyol and isocyanate, into a cavity of a foaming tool, wherein before and/or during the injection at least one predetermined, cavity-bounding surface region of the foaming tool is temperature-controlled in such a manner that the foamed moulded part has an integral, essentially pore-free skin (1.1) with a thickness of at least 0.5 mm on one side and an open-pore surface (1.2) and/or a thinner, sound-permeable skin (1.4) on its side opposite said skin (1.1).

L'invention concerne un procédé de fabrication d'un revêtement d'isolation phonique léger (1'') pour un élément de carrosserie d'un véhicule automobile, en particulier un revêtement frontal léger, ainsi qu'un tel revêtement (1''). Le revêtement (1'') est réalisé sous forme d'une pièce moulée expansée absorbant le bruit dans un processus de travail à une étape par injection d'un mélange de réaction contenant du polyol et de l'isocyanate dans une cavité d'un outil de moussage, au moins une zone prédéterminée à la surface de l'outil de moussage délimitant la cavité étant tempérée avant et/ou pendant l'injection de telle sorte que la pièce moulée expansée comporte sur un côté une peau intégrale (1.1) sensiblement non poreuse dont l'épaisseur est supérieure ou égale à 0,5 mm et comporte sur son côté opposé à ladite peau (1.1) une surface à pores ouverts (1.2) et/ou une peau plus mince (1.4) laissant passer le bruit.

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