Abstract: The present invention relates to an easily separable laminated/perforated film for packings, that can seal the contents under transportation and storage situations and can be formed to the situation for communicating the container interior with the external side when it is to be used.This laminated/perforated film is the film which has bonded both the films in simulation by providing many perforations onto a formed film and by pressing another film which has been extruded from a film forming machine and which is still in a fused state against this perforated film, and this simulation bonding is to be achieved when the film in the fused state has invaded into the perforations of another film.

Abstract: A closed filled bag is formed using a cylindrical mandrel by feeding a bag forming sheet of a heat-sealable film which is of a web and is directed in a manner to one side of the mandrel so that it leaves two marginal edges on the opposite side of the mandrel which are guided into abutting relationship while the body thereof is formed into a cylinder around the mandrel. The zipper tape is fed to the mandrel and it is provided with spaced apart zipper elements which during feeding are folded into juxtaposition so that a U-shaped zipper tape is fed to the mandrel to overlie the two marginal edges which are of the bag forming sheet and the zipper tape has marginal edges below the zipper elements which are secured to the marginal edges of the bag forming sheet.

Abstract: A packaging bag has a mouth which is shaped so that it can be opened by blowing air into the mouth. A stack of such bags are folded flatly and are sequentially opened for receiving articles. Each bag has a back wall with hooking holes provided for receiving a stacking hook. The front wall of each bag has a large notch which overlies the holes with clearance to permit easy raising of the front wall when air is used to open the mouth. The hooking holes are also formed so that they are easily torn when the bag is pulled off the hook in a direction away from the mouth. To this end, each hook hole has a sharp portion in the direction of the mouth.