| 摘要 |
<p>The lid structure for a food packaging container comprises a paper-based body layer (1) and, on the side that is to be against the packaging container, plastic layers that function as a barrier and as heat-sealable layers. The lid structure comprises, as the plastic layers attached to the body layer (1), one or more layers (2; 2a, 2b, 2c, 2d) of biodegradable plastic, such as polylactide and/or polyhydroxy alkanoate and on their outer side, the outermost layer (3), which is formed of biodegradable ester copolymer, to whose ester parts a comonomer has been linked by ester or amide bonds.</p> |
