Patent ID: 11897662
Assignee: IDEMITSU UNITECH CO., LTD.
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 11:
12. A manufacturing method of a zipper-tape bag, the method comprising:
feeding an elongated zipper tape whose cross sectional profile comprises: first and second bases; and mutually engageable first and second engagement portions respectively protruded from the first and second bases;
bonding the first and second bases respectively on a pair of mutually facing films; and
bonding the films with each other to form a bag body, wherein
the method further comprises forming an intermediate hinge at least one point of the zipper tape in a longitudinal direction of the zipper tape, and wherein
the intermediate hinge is provided such that the first engagement portion near the intermediate hinge is bent away from the second engagement portion when a pair of facing surfaces of the bag body are oppositely slid along the longitudinal direction of the zipper tape, and
wherein an engagement strength when the first and second engagement portions are mutually engaged is 26 N/50 mm or more.