| 摘要 |
<p>The grid (2) has an uneven active surface (4) comprising wire-like perforations (8) and unperforated surfaces (14) formed adjacent to the active surface and folded to form multi-layered webs (12) over the width of the grid, where the webs are arranged at a distance from each other. The layers of the webs are directly and/or indirectly connected with each other by form-fit connection and/or welding process. A stiffening element (16) is inserted in one or multiple webs, where the grid is made of an integral metal sheet (18).</p> |
