| 摘要 |
<p>A packaging laminate for a retortable packaging container for a food in which the packed food may be stored and, after storage, be heated by means of microwaves without the packaging container first needing to be opened. The packaging laminate (200) has a core layer (201) and outer, liquid-tight coatings (202, 203) of a thermoplastic which withstands heating in a retort. Between the core layer (201) and one of the two outer liquid-tight plastic coatings (202), the packaging laminate (200) has a film (204) serving as gas barrier which, by means of a lamination layer (211) is bonded to the core layer (201). In order to increase the internal cohesion of the packaging laminate (201) between the layers as well as the tightness properties of the packaging laminate (201) against gases, in particular oxygen gas, the film (204) displays, at least on its one side, an outer coating (207) of a water-soluble adhesion-promoting polymer component, preferably a modified polyacrylic acid (PAA) and a water-soluble barrier-increasing polymer component, preferably a polyvinyl alcohol (PVOH), in a coating quantity of between 1 and 3 g/m2, such as, for example, 1.6 g/m2.</p> |
