| 摘要 |
<p>An apparatus for sealing a liquid pack wherein the packaging material consists of paper is coated with plastics on at least one surface, comprises a pair of extending fingers 1, 1', which can be inserted in the open end of the pack 35 and moved apart to flatten the top edge thereof; a pair of welding jaws 3, 3' to seal the top folded seam strip 2; and a drive 21, 22; 24, 35 for the fingers provided with cam surfaces 14 to control the movement of the fingers. In order that a filled pack can be folded exactly along the creases made in the paper thereof and also imperviously welded instantly in one operational cycle, each extending finger 1, 1' is constructed in strip form at its engaging end, with narrow edges which are rounded in cross section, its longitudinal axis perpendicular to the top folded seam strip 2 of the pack, at least during its initial movement and is driven by means of the cam 14 for movement in a plane located above the seam strip 2, and each welding jaw 3, 3' is driven synchronously with the movement of the extending fingers 1, 1', for rotation about a shaft 25, 27' in such a way that the jaw strips the seam strip 2 off the extending fingers 1, 1'. <IMAGE></p> |
