| 摘要 |
Linear low-density polyethylene is used in a male-side base layer (21A1), which is continuous with a male part (21B) of a male-side belt-like base part (21A) in a zipper tape (20), and a female-side base layer (22A1), which is continuous with a female part (22B) of a female-side belt-like base part (22A) in the zipper tape (20). A resin containing at least 50 % by mass of polyethylene with respect to the other resin is used in a male-side sealing layer (21A2) and a female-side sealing layer (22A2), which are joined to sealant layers (11B) of base films (11) composed of a resin containing at least 50% by mass of polypropylene with respect to the other resin. The sealing performance at joint surfaces between the inner surface of a bag body (10) and the resin spread as a result of the male part (21B) and the female part (22B) being flattened at positions of side-sealing parts can be sufficiently maintained. |
