MULTI-LAYER JOINTLY EXTRUDED SEAMLESS TUBULAR SHELL STRETCHED IN TWO DIRECTIONS AND MODIFIED WITH FIBER, AND ALSO ITS APPLICATION AS PACKAGING FILM FOR FOOD PRODUCTS

摘要

FIELD: packaging industry.;SUBSTANCE: invention is related to technology of synthetic films preparation, in particular to at least three-layer jointly extruded films stretched in two directions and may be used in food industry for packaging of meat and sausage products. Seamless tubular shell consists of the following layers, when looking inside from outside, a) external layer A from main component-polyamide or mixture of several polyamides, b) if necessary, layer B, which has property to block oxygen access, c) if necessary, central layer C from the main component - polyamide or mixture of several polyamides, d) layer D, relative to neighboring layer C or B or A and neighboring layer E acting as adhesion intensifier, and e) internal layer E from the main component - polyamide or mixture of several polyamides, f) if necessary, other layers and additives, at that at least one layer one layer contains natural fibers with fiber length in the range from 5 to 35 mcm and/or from 35 to 350 mcm and/or mixture of natural fibers from fibers of different type and/or different length.;EFFECT: shells have appearance and touch properties similar to natural ones, proper consumer and mechanical properties.;17 cl, 1 tbl, 2 ex