Package bag and method for producing same

A manufacturing method of a package bag including:

• a spout defined by a pair of flow passage forming sealing portions which are formed by sealing two films at both side portions of a flow passage;
• a groove rib formed so as to protrude outward of the film and extend along the flow passage;
• and a cured portion formed on at least one side of the rib by crystallizing at least a portion of a resin constituting the film, the manufacturing method comprising:
• a cured portion forming step of forming the cured portion on at least one side of a forming position of the rib by crystallizing at least a portion of the resin constituting the film by heating and cooling the film;
• and
• a rib forming step of forming the rib by pressing the film using concave and convex molds without heating and crystallizing the rib,
• wherein the cured portion forming step comprises a heating step of heating the film by a heater abutting the film at least over a glass-transition temperature of the film, and a cooling step of cooling the film by a cooler.