PURPOSE: To permit the various kinds of adhesive and semifluid contents to be easily and wholly removed from film bags without being adhered to the film surfaces by applying a release agent partially to the part other than heat bonding areas or a slightly wider part than the aforesaid part of a film-formed bag having heat bondable resin layers on its inner surface to sealingly fill its contents therein.

CONSTITUTION: A laminate film 1 is used which consists of at least the two layers composed of a base film and a heat bondable resin film formed thereon. Nylon, polyester, stretched polypropylene, etc., are used in the manufacture of the base film and a low-density polyethylene, an ethylene-vinyl acetate copolymer, etc., are used as the heat bondable film. The part 2 for forming the inner surface of this film bag other than the heat bonding areas is coated with a release agent. Silicone resin is preferred for use as the release agent and partially applied to only the inner surface of the bag, for example, by using a photogravure press, leaving the heat bonding areas 3 and 4 uncoated.