| 摘要 |
<p>PURPOSE:To continue steps, to enhance productivity by shortening the steps and to generate wrinkle by deviating a film at the time of laminating. CONSTITUTION:The method for manufacturing a retort packaging material comprises the steps of providing a laminated film 7 in which a heat resistant film is connected to an aluminum foil through a resin layer and an olefin film 6, so melting and extruding that a co-extruded resin layer of a heat adhesive resin layer 8 and an olefin resin layer 9 is disposed at the foil side between the films 7 and 6 with the foil disposed inside, holding the co-extruded resin layer in a heated state for a predetermined time, and then cooling to solidify the co-extruded resin layer to connect the film 7 to the film 9.</p> |
