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Abstract

A method for producing a noise insulation piece of mass/spring construction. The mass has, at least before a deep draw process, at least one locally defined region, with a different weight per area from the other regions. After the deep draw process, the spring layer made from an elastic light material such as two-component polyurethane foam or a mixed non-woven fiber is applied. The locally different weight per area of the mass is achieved by means of application of a granulate to a base mass layer in particular in locally differing amounts and/or thicknesses, wherein the granulate is fixed to itself and to the base mass layer by means of sintering. After deep drawing, the desired weight per area of the mass can be achieved independent of the degree of drawing. The granulate can alternatively also be applied to a thin and lightweight support layer in locally required amounts or thicknesses.

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First Claim