| 摘要 |
<p>A resilient unit comprises a number of wire coil springs (12), each of which is located within its own discrete pocket (14) formed by first, upper and second, lower layers (14a) and (14b) of material, preferably of non-woven material. The two layers (14a) and (14b) have been thermally, or ultrasonically, welded together at points (16) between the adjacent springs to create the pockets. The upper layer of material (14a) differs from the lower layer of material (14b) in respect of at least one characteristic.</p> |
