| 摘要 |
A vertical form, fill and seal machine, for making material-filled pouches is disclosed which has first and second transverse heat sealing jaws with at least one of the jaws being capable of transverse motion. The jaws are adapted to collapse a tubular film, horizontally, as the tube passes between the jaws. The pouch is formed by transversely heat sealing a material-filled tubular synthetic thermoplastic film at intervals, using the jaws to form said seals. The invention comprises a first lower jaw wall adapted to move in concert with the first jaw and a second jaw wall adapted to move in concert with the second jaw. The first and second transverse heat sealing jaws and said first and second lower jaw walls have widths parallel to the vertical axis of the vertical form, fill and seal machine and lengths transverse to the widths. The first lower jaw wall is convex in the transverse direction, and the second lower jaw wall comprises an elastomeric sheet held under tension in the transverse direction. The first and second lower jaw walls have a width of from 5 to 20 cm.
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