FIELD: packing.
SUBSTANCE: invention relates to co-extruded thermoplastic shell for foodstuffs. Proposed shell consists of, at least, two layers including outer layer (Z). The said outer layer features porosity of, at least, 5% by volume, as measured with respect to pores or, blisters, in the surface plane. The surface of outer layer (Z) features a surface structure with open pores and/or crateriform structure and mean depth Rz of micro irregularities making, at least, 5.0 mcm. To produce proposed shell, prior to extrusion, at least, one porophore and/or foaming gas is added, or composition is selected to that to produce gas in polymer mass via chemical reactions between the components.
EFFECT: production of co-extruded shell resembling natural intestinal coat.
18 cl, 3 tbl, 9 ex
