ZIPPER TAPE, PACKING BAG WITH ZIPPER TAPE AND APPARATUS FOR PRODUCING PACKING BAG WITH ZIPPER TAPE

摘要

A zipper tape (1) includes a pair of a male member (11) and a female member (12) including engagement portions (10) and belt-like bases (13), (14) continued to the engagement portions (10). The belt-like base (14) includes a seal base (141) defined by widening the belt-like base (14) a larger width from the engagement portions (10) to a crosswise end (141C) of the belt-like base (14) than that of the belt-like base (13). A bond layer (51) and an easy-peel layer (52) are layered on a surface (141B) of the seal base (141) in side of the engagement portion and heat-fused to a bag body (20). The seal base (141) is formed of polypropylene. The bond layer (51) is formed of a mixture of polypropylene and low density polyethylene. The easy-peel layer (52) is formed of a mixture of low density polyethylene and polypropylene. A ratio of polypropylene in the easy-peel layer (52) is smaller than a ratio of polypropylene in the bond layer (51).