| 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. |
