PURPOSE: To efficiently manufacture an easily openable packaging bag which can be opened easily, by melting heat bonded resin layer by means of supersonic wave or heat, stamping the shape of a seal plate mold, using the same and manufacturing a packaging bag.
CONSTITUTION: A wide sheet 1 manufactured by the extrusion molding or the like is provided with a slit section 2 in the longitudinal direction so as to be formed in the given width, and a processed section 3 on which stamping is carried out in the shape of a seal blade mold is provided. Then, a film is cut at the slit section 2, which is folded with its inner side forming a heat bonded layer, and its peripheral edge section 5 is heat bonded to manufacture a packaging bag 6. That is, in the stage of manufacturing a film for manufacturing packaging bags of given width out of the wide film extrusion molded by an extruder or the like, the slide section is provided in the given width and the heat bonded resin layer is melt by supersonic wave, heat or the like, and boarding is carried out for forming the seal blade mold, by which an easily openable packaging bag can be manufactured.
KOSUGE TOKUO
NAKANE OSAHISA
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