| 摘要 |
A manufacturing method of a package bag (10) according to the present invention includes: a cured portion forming step of forming a cured portion (15a, 15b) on at least one side of a forming position of a rib (14) by crystallizing at least a portion of a resin constituting a film (11) by heating and cooling the film (11); and a rib forming step of forming a rib (14) by pressing the film (11) using concave and convex molds. According to the present invention, it is possible to maintain an opening state of a spout (12). Further, since additional material is not required, it is possible to suppress increase in the thickness of the package bag (10) and to reduce the bulkiness of the package bags. |
