| 摘要 |
The web has an intermediate layer and/or a reinforcement part made of non-woven fabrics (24, 26) i.e. glass mats. The non-woven fabrics include reinforcing threads (30, 32, 40, 42) in form of polyester threads and mechanical reinforcement units. The reinforcing threads are provided in a boundary region and within a center area for mechanical adjustment of roofing sheets (10, 12). The non-woven fabric is a glass fiber fleece having surface weight between 50 and 70 gram per meter square. |
