| 摘要 |
A tube of film 12 is pierced by an injection needle 18 that fills the tube with air as the film and needle move. Two spaced heat seal wires 22 seal longitudinal extents of the tube from each other. A piston shaft 100 is constrained to move with a carriage 56 to compress and expel air from a cylinder, which air is supplied to the space within the tubular bag. An air paddle 92 pushes on the outer side of the bags to cause air that has recently been injected to be urged forwardly, within the bag, and through the space between an anvil 23 and the sealing wires 22 into the bag that is formed moments later by heat sealing. <IMAGE> |
