| 摘要 |
<p>The sheet (1) has dimples (5) protruding over a flat area (2), each having a dimple casing (3) and a dimple cover (4), where contact surfaces for placement of the sheet against a bitumen sheet (6) are formed by the outer side (A) of the dimple cover. The proportion of the total contact surface of the dimples of the total surface of the sheet is greater than 35 percent. A base surface of the sheet is formed from the flat area, where the sheet has a protection coefficient (PC) defined using total contact surface of the dimples and dimple height.</p> |
