MANUFACTURING PROCESS FOR GLUE-LESS MULTI-LAYER DECORATED FILM AND THERMOFORMED PRODUCT OBTAINED THEREWITH

摘要

A composite plastic film obtained by thermoforming and a manufacturing process thereof are disclosed, comprising the steps of producing a first plastic substrate film in the amorphous state, by extrusion, causing said first plastic substrate film to a undergo a decoration/metal-finish process, and causing said first plastic substrate film to undergo a lamination step, wherein before said lamination step, on said first amorphous substrate film a layer of molten plastic material is laid, coming out of an extrusion head (4a), and said first plastic film coupled with the layer of molten plastic material, immediately downstream of said extrusion head (4a), passes between an entry cylinder (5a) and a master cylinder (5b) of a lamination unit furthermore comprising at least an exit cylinder (5c), the thickness of said first substrate film being in the range of 150-800 μιη and the thickness of said molten layer being in the range of 150-1200 μιη after lamination, said entry cylinder, master cylinder and exit cylinder being heat adjusted on temperatures in the range 20-55°C, with growing temperatures from the entry cylinder (5a), to the master cylinder (5b) to the exit cylinder (5c).