| 摘要 |
A tube (4) of plastics material extruded by an extruder (1), is inflated by compressed air from a nozzle (6) and the expanded tube (7) is passed between pinch rollers (8) to a storage roll (9). To expedite cooling of the inflated tube (7), the tube (7) is surrounded by a column (10) and cooled air from a fan/cooler unit (12) is supplied through a hose (13) to an annular space (11) between the tube (7) and the column (10) and extracted from the space (11) by a hose (14) and returned to the unit (12). Irises may be provided at the top and bottom of the column (10) to seal the ends of the space (11) and plenums at the top and bottom of the column (10) preferably cause a toroidal air flow in the space (11). <IMAGE> |
