STERILIZABLE FILM COMPOSITE FOR PACKAGING PURPOSES

摘要

Laminated packaging film with a good barrier action after sterilisation in hot water or steam comprises coextruded polyethylene terephthalate (PET)-polyethylene 2,6-naphthalate (PEN) film, with a silicon oxide barrier layer formed on the PEN by evaporation of silicon monoxide or a mixture of silicon dioxide and silicon under vacuum. Laminated film for packaging applications, with a good barrier action against water vapour and gases after sterilisation in water or steam at above 90 degrees C. This laminate comprises polyethylene terephthalate (PET) film with a coextruded layer of polyethylene 2,6-naphthalate (PEN) on at least one side and a layer of silicon oxide ceramic (SiOx) with a thickness of 10-200 nm and with x = 0.9-2 , formed on at least one of the PEN-coated sides by the simultaneous evaporation of silicon dioxide (SiO2) and metallic silicon or by the evaporation of silicon monoxide (SiO) under vacuum. An Independent claim is also included for a process for the production of laminated packaging film by coating at least one of the PEN sides of a PEN-coated PET film with a layer of SiOx ceramic as above by means of a thin-film vacuum-coating technique involving the simultaneous evaporation of SiO2 and silicon under vacuum, and then laminating the resulting coated film with other films as required.