| 摘要 |
In order to seal the openings (5) leading into the flutes (4) of a structured sheet (1), such as a polypropylene structured sheet used for packaging, or a polycarbonate structured sheet used for conservatory roofs, a strip of sheet sealing material (47) of the same material as that of the structured sheet is welded across the mouth surfaces (6) at the margin of the structured sheet. The welding process involves use of a heated platen (43) which is urged towards the margin of the structured sheet, a strip of heat-resistant protective sheet material (45) being sandwiched between the heated platen (43) and the sealing material (47) during welding. A plurality of structured sheets (1) placed in register may be connected together around their margins by such a welding process, to produce a pallet deck. A pallet leg (30), Figures 7 to 9, may be sealed to a pallet deck by the process. <IMAGE> |
