| 摘要 |
<p>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.</p> |
