| 摘要 |
Low density semifinished product for manufacturing buoyant products, comprising a plurality of layers (3) of closed-cell expanded material, having a specific gravity lower than that of water, the said layers (3) being flexible and elastic and being joined together by quilting (4, 5) spaced so as to define between them pockets of air, characerised in that the said quilting (4, 5) is preferably distributed in closed patterns. |
