Patent ID: 8011831
Filing Date: 2011-09-06
Classification: B29C,B29L,B31B,B65D,Y10T

Abstract:
1. A zipper tape, comprising: a male member including a first engagement portion and a first belt-like base continued to the first engagement portion and a female member including a second engagement portion and a second belt-like base continued to the second engagement portion, the first and the second engagement portions mating in a pair, wherein one of the first and the second belt-like bases is widened from the mating first and second engagement portions to a crosswise end of the one of the first and the second belt-like bases relative to the other of the first and the second belt-like bases in order to define a seal base, a bond layer and an easy-peel layer bonded to the seal base via the bond layer are layered on a first surface of the seal base in side of the mating first and second engagement portions, the seal base is formed of polypropylene, the bond layer is formed of a mixture of polypropylene and low density polyethylene, the easy-peel layer is formed of a mixture of low density polyethylene and polypropylene, and a ratio of polypropylene in the easy-peel layer is less than a ratio of polypropylene in the bond layer.