| 摘要 |
A frame (100) including a fixed part (120) and a moving part (140) and means (160, 161) for widths, means (170) for welding the two sheets, these welding means being provided in the vicinity of the said common plane and being fixed to the frame in a region located right opposite each area of overlap between two adjacent sheets. Application, in particular, to the production of waterproof (impermeable) membranes for pools, artificial sheets of water, etc. <IMAGE> |
