| 摘要 |
<p>A composite board (10) comprising a first (12) and fifth layer (14) of thermoplastic material, a second (16) and fourth layer (18) of metal and a third layer (20) made from a combination of thermoplastic material and a reinforcing filling agent, the third layer including at least one hollow void (24). The second (16) and fourth layers (18) are fixed to the third layer (20) through thermal bonding and the first layer (12) and fifth layer (14) are extruded over the second layer (16) and fourth layer (18) respectively.</p> |
