| 摘要 |
A formwork or construction element tube 1111, which is made from multiple layers of a multi-layered material 100, 200, 10, which includes at least two filament reinforcing layers. There can also be included at least one layer of paper, cardboard or polymer, the layers being bonded together. The present invention also provides a multi-layered material, which has a base layer of a filament layer 20 and a backing layer 15 or 25 to form a sheet material 10, 100, 200, which includes at least one non-woven filament strength or reinforcing layer, and a layer of paper, cardboard or polymer, the layers being bonded together. |
