Molded article designed to absorb airborne sound

Details Molded article designed to absorb airborne sound Molded article designed to absorb airborne sound

1995-05-02

1997-07-29

Dang, Khanh

Acoustics

Sound-modifying means

Sound absorbing panels

181294, 181295, E04B 182

Patent

active

056524153

ABSTRACT:
A molded article for the absorption of airborne sound, to be used principally in the engine compartment of motor vehicles and particularly as a sound absorber inside partial and complete motor encapsulations, is formed by a porous absorber (1) of which the core (6), being sealed on both sides (7,8) over its complete surface by a respective PU film of a thickness less than 90 .mu.m, is made from an open-pored PU (polyurethane) foam of a thickness of at least 3 mm and about 15 mm at the most. The core comprises cavities (2-4) originating on the bottom face and formed by the injection molding process, said cavities being open only towards the bottom face (5) and having different cavity volumes and different heights (11) measured from the bottom face (5).

REFERENCES:
patent: 4149612 (1979-04-01), Bschorr
patent: 4242398 (1980-12-01), Segawa et al.
patent: 4425981 (1984-01-01), Kiesewetter et al.
patent: 4584232 (1986-04-01), Frank et al.
patent: 5410111 (1995-04-01), Stief et al.
patent: 5521341 (1996-05-01), Stief et al.

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