Abstract: Composite materials for retort container comprising a biaxially stretched film of a copolymer of vinylidene chloride and an acrylic ester and a polypropylene film formed on one or both sides of the biaxially stretched film. On the polypropylene film may be further formed a talc-blended or odorless polypropylene film directly or on another polypropylene film. Top materials for the container comprise a biaxially stretched film of the vinylidene-acrylic ester copolymer, a sequential biaxially stretched film of nylon 6 formed on one side of the biaxially stretched film, and a heat-sealable heat-resistant plastic film formed on the other side.

Abstract: An inert gas-filling and packaging apparatus which is adapted to fill an inert gas in containers, each having a content and seal the containers one by one after coverage of an opening of the container with a sealing film is described. The apparatus comprises a plurality of buckets for individually receiving a container having an upper opening, a film supplying means for supplying a sealing film arranged to move over the plural buckets, a vertically movable keep pad for keeping the sealing film in contact with the upper face of the bucket, the contact member having grooves provided at opposite sides of the plural buckets, through which the nozzle is inserted to inject an inert gas, and a nozzle for injecting the inert gas. The sealing film is sealed on the container by means of a heat sealing means surrounded by the keep pad. The heat sealing by the apparatus ensures a good appearance of a final product without involving any wrinkles in the sealed film.