| 摘要 |
The present invention provides multilayered coextruded thermoplastic food casing comprising at least one porous inner layer, wherein the porosity of said at least one porous inner layer has been generated by (co)extruding a first polymer composition comprising a polymer and a supercritical pore-forming agent, wherein the porosity of the sum of said at least one porous inner layer is in a range of from 5 to 90 % by volume, said at least one porous inner layer has a porosity comprising pores having a pore diameter of from 0.01 to 2000 Ám, such that said at least one porous inner layer is able to absorb, retain, desorb and to transfer at least one transferable functional additive from said at least one porous inner layer to food encased in said casing, at least one layer having a barrier effect for water vapor, at least one adhesive layer, said adhesive layer optionally being the same as or different from said porous inner layer and/or said layer having barrier effect for water vapor; as well as a method for producing said multilayered coextruded thermoplastic food casing. |
