| 摘要 |
An apparatus for sealing longitudinal overlapping edges of tubular thermoplastic film. The apparatus comprises a fixed block ( 31 ) for guiding and holding the overlapping edges and a sealing head ( 6 ) spaced from the fixed block for directing jets of hot air onto the overlapping edges of the film guided on the fixed block. The sealing head ( 6 ) is movably mounted such that the sealing head is positioned a short distance from the film as the film is advancing and the sealing head is withdrawn from the film when the film is stop. |
