Loading patent…
AssigneeHP-Chemi Pelzer Research and Development Ltd.
InventorsVolkmar Schulze, David Spitzer, Stefan Tschungmell, Michael Bopp, Carsten Mantei
Estimating the term…
The invention relates to a method for producing mass absorber systems, sound insulations having a great thermostable, noise-reducing effect, especially for the engine compartment of motor vehicles. Disclosed is a method for the direct backfoaming of absorber systems, the absorber of which comprises a foam layer (2) or fleece layer (4) with a one-sided or double-sided covering layer (3). Said method is characterized by the fact that the mass side of an absorber having a very low density is provided with a foam-impermeable covering layer (3), the absorber is placed in the foaming tool, and a certain pressure is generated in the absorber via the side located opposite the mass inside the closed foaming tool before the foaming process is triggered.
A process for the direct foam-backing of absorber systems in which the absorber consists of a foam layer or non-woven layer with a cover layer on one or both sides, characterized in that an absorber with a very low density is provided with a foam-impermeable cover layer on the mass side, the absorber is positioned within the foaming mold, and a pressure is built within the absorber from the side facing away from the mass in the closed foaming mold, before the foaming process is initiated.
Dependencies are inferred from the claim text.