| 摘要 |
A multilayer cover for rigid or semi-rigid thermoformed packages comprises a layer of heat-shrinkable film having a coefficient of contraction similar to that of the package material and coated with a material which will bond with the package surface, pref. during and after thermoforming. The film is a transparent, opaque or metallised single or multiply film 40 to 200 microns thick, depending on the rigidity and coefficient of contraction of 7. Opt. film is of polystyrene, polypropylene, polyester, polyether, PVC, polyethylene. |
