METHOD FOR THE PROTECTION OF THERMOPLASTIC PLATES

摘要

A method for the protection of a thermoplastic plate comprising the application of a coextruded simultaneously bi-oriented film consisting of the following layers:a) a central layer made of a propylene homopolymer or copolymer made of propylene and ethylene and/or alpha olefins having 4-8 carbon atoms, with a melt flow index (MFI) (ISO 1133, 230 DEG C/10 min) of at least 1.5 - 10 g/10 min, b) an adhesive outer layer comprising copolymers consisting of ethylene and alpha olefins in C3 - C12, having a specific mass (ASTM 792) of 0.887 g/cm<3> to 0.916 g/cm<3>, or copolymers consisting of ethylene and vinyl acetate (EVA) wherein the vinyl acetate monomer represents 2 % -14 % in terms of mols, said ethylene copolymers having an MFI (ASTM D 1238, 190 DEG C/2.16 kg) of 1 - 10 g/10 min, wherein layer b) is polarized on the surface thereof; the application of the multilayer to the plate is carried out after tensioning of the film by bringing the adhesive layer b) into contact with the plate, and by passing both items through two cylindrical rollers rotating in an opposite direction.