| 摘要 |
Soundproofing panel has a sandwich structure made from two rigid layers (12, 14) e.g. of aluminum or steel, and a core (20) comprising a rigid filling material (22) against the inner layer (14), and an element (26) of a first thin sheet material, essentially an elastomer such as rubber with optional mineral fillers and a density of at least 100 kg/cu m. Soundproofing panel has a sandwich structure made from two rigid layers (12, 14) e.g. of aluminum or steel, and a core (20) comprising a rigid filling material (22) against the inner layer (14), and an element (26) of a first thin sheet material, essentially an elastomer such as rubber with optional mineral fillers and a density of at least 100 kg/cu m. A variant of the core can incorporate an element of a second thin sheet material with a density five times lower than the first, i.e. less than 20 kg/cu m, and made e.g. from an open cell foam or synthetic resin.
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