| 摘要 |
<p>The disclosure relates to a laminated packaging material (10) comprising a layer (11) of paper or paperboard and outer, liquid-tight coatings (12, 13) of plastic on both sides of the paper or paperboard web (11). In order to facilitate material recycling after use of the laminated packaging material (10), the packaging material (10) is provided with layers (14, 15) of water-soluble polymer between the paper or paperboard layer (11) and each respective outer plastic coating (12, 13), the layers (14, 15) serving as adhesive or binder. At the same time as the adhesive or binder layers (14, 15) bond together the individual layers with good adhesion for the formation of a well-integrated packaging material, they make possible the ready separation or delamination of the packaging material after use, by treatment of the material, preferably comminuted into smaller pieces, with hot water at approximately 40-60 °C, whereby the adhesive or binder layers (14, 15) are dissolved and leave behind easily separated fractions of paper or paperboard and plastic, respectively. Examples of adhesives or binders may be biopolymers or synthetic, water-soluble polymers, e.g. starch or polyvinyl alcohol, which are applied in quantities of between 0.1 and 5 g/m2 (dry weight).</p> |
