| 摘要 |
Tubular plastics film ( 18 ) is bunched up. Air is blown through one end of the tube by a fan ( 64 ). The air passes through the tube and through a spreader ( 30 ) of the film and then past a sealing station. The sealing station effects two adjacent seals across the film and also creates a line of weakness between those adjacent seals in a single operation. Air bags are formed between spaced seals effected in sequential sealing operations.
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