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

摘要

Zipper tape (1) includes a pair of members, namely male member (11) and female member (12), composed of occlusal part (10) and strip-shaped base parts (13,14). One of the strip-shaped base parts (14) has seal base part (141) with a width size extending from the occlusal part (10) to side end (141C) of the strip-shaped base part (14) greater than that of the other strip-shaped base part (13). Adhesive layer (51) and easy peal layer (52) are superimposed on the seal base part (141) on its occlusal part side surface (141B), and fusion bonding is effected so as to obtain bag (20). The seal base part (141) consists of polypropylene. The adhesive layer (51) consists of a mixture of polypropylene and low-density polyethylene. The easy peal layer (52) consists of a mixture of low-density polyethylene and polypropylene. The ratio of polypropylene in the easy peal layer (52) is less than that in the adhesive layer (51).