| 摘要 |
<p>The plate has a covering layer (1), and a core layer (5) connected with the covering layer and comprising cavities (7.1, 7.2), which are separated from each other. A part of the cavities is filled with a sound-absorbing material e.g. polyurethane-based foam. Another covering layer (3) is connected with the core layer. Another core layer comprises cavities separated from each other, where a part of the cavities in the latter core layer is filled with the sound-absorbing material. The covering layers, the core layers and/or a separating layer are made of aluminum or steel.</p> |
