| abstract |
The invention provides a production method for a high-pressure processed multilayer structure body used in packaging of food, or the like. To this end, the invention comprises: preparing a multilayer structure body 1 having an ethylene-vinyl alcohol-based copolymer (EVOH) layer 2 and an olefin-based resin layer 4, wherein the EVOH layer 2 comprises a resin composition having as the main component an ethylene-vinyl alcohol-based copolymer having a saponification degree exceeding 99.7% by mole, and the olefin-based resin layer 4 has a thickness of less than 100 μm; and subjecting the multilayer structure body 1 to high-pressure processing under an atmosphere of 20°C or higher and a pressure of 200 MPa or higher. |