Abstract: The present invention provides a method of producing a gas-permeable parcelling film for use in a container for isolating a product to be preserved from a freshness keeping agent placed within the container. The parcelling film has a gas-permeable formed member which is obtained by subjecting plastic fibers to a paper-making process and a drying process to obtain a dried sheet of plastic fibers, and then subjecting the dried sheet to a forming process into the formed member. The parcelling film is impregnated with fluororesin, before being subjected to the forming process.

Abstract: A package of a food or a similar product which has to be preserved in fresh state. The package contains a sack charged with a freshness keeping agent for keeping the product fresh together with the product. The package comprises a carrier seat provided in the package and carrying the sack of freshness keeping agent fixed thereto, the seat having one end integrally heat-welded in one of the heat-sealed portions of the package and the other end integrally heat-welded in the other of the heat-sealed portions of the package.

Abstract: An oxygen scavenger container installed in a cap used for a liquid substance-containing vessel having an inner structure composed of an upper vacant compartment including a wall portion having at least one opening providing communication between the upper vacant compartment and the exterior of the scavenger container, a lower container compartment which contains the oxygen scavenger, and partition means provided to separate the upper compartment from the at least one opening and the lower container compartment, said partition means comprising single or plural sheets of gas permeable liquid-proof material to provide a double barrier between the oxygen scavenger and a liquid substance.