A packaging Iaminate for a thin-walled flexible packaging container for a liquid food

Abstract

A packaging laminate for a thin-walled flexible packaging container for liquid dairy produce. The packaging laminate (10) includes a thin layer (11) of paper or paperboard and outer, liquid-tight polyolefin coatings (12 and 13) of which the one (12) contains light-absorbing carbon particles in a sufficient quantity to impart to the packaging container superior tightness properties against light, in particular UV radiation. The particle containing polyolefin coating (12) is laminated to the paper- or paperboard layer (11) by means of an extruded lamination layer (14) of polyolefin. In order to conceal the coating (12) blackened by the carbon particles and make it invisible through the paper- or paperboard layer (11), the paper- or paperboard layer (11) contains light-reflecting particles, preferably titanium dioxide particles, embedded in and spread through the fibre basic mass of the paper- or paperboard layer (11). The quantity of light-reflecting particles in the paper- or paperboard layer (11) lies within the range of between 7 and 20 weight %, counted on the total weight of the fibre layer (11), but is preferably sufficiently great also to impart to the packaging laminate (10) a whitish, pure appearance and thereby also a contrastimproving background against a printed pattern on the packaging laminate (10).