| 摘要 |
An acoustic door comprises a frame as well as a first panel of gypsum mounted on the frame and having its outer face covered with a sheet of metal and its inner face covered with a layer of lead (Pb) to thereby form a first rigid wall. A second panel of gypsum of different thickness has also its outer face covered with a sheet of metal and its inner face covered with a layer of lead to form a second rigid wall. A strip of flexible material adhesive on both sides thereof is used to mount the second wall on the assembly frame-first wall while establishing no acoustic short circuit between them. The first and second walls are relatively thin while being sufficiently rigid whereby the space of air between the two layers of lead is maximized. This air space also contains acoustic insulation including fibers set into vibration to transform the mechanical energy of sound waves into heat. On the outside of the door, only a peripheral space exists between the two above-mentioned sheets of metal, which space is filled with a fire resistant, silicone sealant.
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