Method of producing a heavy and waterproof layer for an acoustic protection screen for a motor vehicle

摘要

The invention relates to a method for producing a heavy and waterproof layer (1) for an acoustic protection screen (2) for a motor vehicle, said method comprising the following steps: producing a sheet (4) based on polyvinyl butyral ( PVB), placing said sheet in an injection mold, the remaining space available forming a molding cavity, injecting into said cavity a composition based on PVB to produce an underlayer (5) of mass reinforcement partially overmolding said sheet on one of its faces so as to define: at least one accentuated acoustic protection zone (6) provided with said sublayer, and at least one minimal acoustic protection zone (7) devoid of said sublayer. Single figure