| 摘要 |
A packaging laminate for a retortable packaging container, the packaging laminate ( 30 ) including a paper or paperboard layer ( 31 ), outer, liquid-tight coatings ( 32; 33 ) and an aluminium foil ( 34 ) serving as gas barrier between the paper or paperboard layer ( 31 ) and one of the two outer liquid-tight coatings ( 32 ). In order to compensate for or counteract possible loss of gas tightness because of crack formations or similar untightness in the tensile-sensitive aluminium foil ( 34 ), the packaging laminate ( 30 ) includes at least one additional layer ( 35 ) serving as gas barrier between the paper or paperboard layer ( 31 ) and the aluminium foil ( 34 ). Preferably, said at least one additional gas barrier layer ( 35 ) is bonded to the paper or paperboard layer ( 31 ) by an interjacent lamination or adhesive layer ( 36 ) of polypropylene or other olefin polymer, whereby the thickness or quantity of the additional gas barrier layer ( 36 ) may be reduced without deterioration in gas tightness properties in the finished packaging container.
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