| 摘要 |
<p>A VFFS (vertical form, fill and seal) packaging machine, in which a web of bag-forming material (23) is driven downwards at a cyclically varying speed around a former (24) to overlap the edges of the web, and including a hot air device (10) for directing hot air onto the overlapping edges so as to seal them, characterised in that the hot air device (10) is supplied with air by a variable-speed blower (13) which automatically varies the velocity of the hot air directed towards the edges of the web, depending upon the speed of the web.</p> |
