Packaging bag and method for manufacturing same
The present invention relates to a method for manufacturing a packaging bag, comprising the steps of: (a) continuously feeding a pair of strips of plastic film material for a main bag body in a longitudinal direction so as to be apart from each other; (b) continuously feeding a pair of strips of thin sheet material for a framework member to place said pair of strips for the framework member on respective inner surfaces of said pair of strips for the main bag body in predetermined positions thereof; (c) bonding said pair of strips for the framework member to said pair of strips for the main bag body, respectively; (d) bringing one of said pair of strips for the main bag body close to another of said pair of strips for the main bag body so as to cause said pair of strips for the framework member face each other, thus preparing a set of composite strips; (e) thermally bonding said set of composite strips in a perpendicular direction to a longitudinal direction thereof by predetermined intervals to form side heat-sealed portions; (f) thermally bonding said set of composite strips on one of longitudinal edges of said set of composite strips to form a bottom heat-sealed portion; and (g) cutting each of said side heat-sealed portions in two in said perpendicular direction to the longitudinal direction of said set of composite strips, thereby continuously manufacturing a plurality of packaging bags each of which comprises the main bag body and the framework member, which is foldable/unfoldable together with said main bag body, to enable said framework member and said main bag body to be shifted between a generally flat collapsed state and an expanded state.
Applicant: HOSOKAWA YOKO KK (JP)
Inventor: ICHIKAWA TOORU (JP)
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