FIELD: packaging industry.
SUBSTANCE: partially metallised packaging film and method for its preparation is described. According to one of the peculiarities of the invention, the flow parts of the evaporated metal do not allow to contact with the sheet of the packaging film during metallisation. The screen is used, which is a rigid plate, which can be made in such a way as to provide sharp transition from a transparent film to a lightproof film or gradual transition from the transparent film to the lightproof film. The partially metallised packaging film is used in a forming-filling-sealing machine or other packaging machine to obtain packages for food products with a viewing window. According to one of the peculiarities of the invention, the barrier film is a film based on biological substances.
EFFECT: creation of the partially metallised packaging film with barrier properties, which are close to the properties of fully metallised packaging films.
16 cl, 26 dwg
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