FIELD: food industry.
SUBSTANCE: group of inventions can be used in production of meat products, cheeses or fish products. Functional additive (co)-extruded thermoplastic food shell has barrier effect in relation to water vapour and/or to oxygen. Inner side of the thermoplastic food shell has a textured surface which forms a three-dimensional pattern of higher and lower retention capacity for the functional additive. Thermoplastic food shell has a textured surface in the case of a single-layer shell or an inner layer containing an inner surface which is textured. In the case of a multilayer shell, at least one thermoplastic polymer material selected from a group consisting of (co)-polyamides, (co)-polyolefins, (co)-polymers (co)-polyester and vinylidene chloride is used as the main component. (Co)-extruded thermoplastic food shell on its outer surface has no mesh and/or material forming a mesh or other three-dimensional structure. Average thickness of the thermoplastic food shell in sections having higher retention capacity ranges from 1 to 100 mcm. Average thickness of thermoplastic food shell on sections having lower retention capacity ranges from 191 to 2,000 mcm, provided that difference between average thickness on said sections having higher retention capacity and average thickness on said sections having lower retention capacity ranges from 160 to 1,950 mcm, and that ratio of average thickness of thermoplastic food shell on sections having higher retaining capacity, to average thickness of thermoplastic food coating on sections having lower retention capacity, ranges from 0.002 to 0.25. In making the shell, a step of subjecting it to at least one mechanical and thermal treatment is provided so as to create on its surface in contact with food product a textured surface having a three-dimensional pattern, as well as a step of coating the outer surface with a portable functional additive with a subsequent optional drying step and a subsequent step of turning the shell inside out.
EFFECT: providing high strength of shell, ability for uniform corrugating and de-foaming, ability to transfer food additives to enclosed product, three-dimensional pattern on surface of product.
16 cl, 1 dwg, 1 tbl
