| 摘要 |
<p>Opening arrangements on packing containers are often of the type which comprises a prefabricated pouring opening. The cut edges appearing around the pouring opening must be protected, e.g. for reasons of hygiene, from the liquid contents present in the packing container, and this is generally done by a liquid-tight strip applied to the inside. A simpler manner of achieving this protection consists in ensuring that the thermplastic layers (3, 4), which in general are present on both sides of packing laminate, extend past the cut edge (12) and are sealed in a liquid-tight manner to each other. This can be achieved simplest if the hole- punching of the carrier layer of the material is done prior to the application of the thermoplastic layers.</p> |
