| 摘要 |
<p>The object of the invention is a method for manufacturing a pour opening in packaging container for a liquid substance. In the method a first hole of predetermined size and shape is formed in the base layer (2) made of fibre-based material of a packaging laminate (1), after which the surface of the base layer is laminated on one side with at least one first thermoplastic layer (4) to form a surface film. In accordance with the invention a second hole of predetermined size and shape is formed in the surface film at the location of the first hole, the edges (5) of which second hole are inside the edges of the first hole (3), the surface opposite to at least one first thermoplastic layer of the base layer is laminated with at least one further thermoplastic layer (6), the hole in the surface layer is furnished with a pull tab (7), and the further thermoplastic layer (6) and the pull tab (7) attached on opposite sides of the hole penetrating the surface layer and the base layer are joined together in the area of the hole by application of heat and pressure in such a way that the parts of the first and the second thermoplastic layers (4,6) covering the first hole are heated to softening temperature and treated in such a way that they are shaped so as to enclose between them the raw edge (5) of the hole in the base layer.</p> |
