FIELD: process engineering.
SUBSTANCE: invention relates to production of perforated film packages. Perforated film package comprises at least three layers. Note here that at least one layer make inner layer with lower fusion temperature compared to those of two outer layers arranged on opposite sides of said inner layer. With film composition subjected to higher temperature, at least one inner layer gets softened to allow sealing of sufficient number of perforations in inner layer at compression to produce higher-efficiency moisture barrier in film composition. Layers of film composition features common center of perforations. Note here that every outer layer is formed by film containing at least one thermoplastic polymer, or by foamed thermoplastic material. Inner layer is made up of film containing at least one thermoplastic polymer, or of foamed thermoplastic polymer wherein at least one inner layer containing thermoplastic resin with Vicat softening temperature varying from 20°C to 150°C.
EFFECT: production of perforated moisture-resistant packages.
32 cl, 8 tbl, 6 dwg
