| 摘要 |
PROBLEM TO BE SOLVED: To provide a plastic zipper having an interposed film in a closure part thereof wherein when the zipper is closed, the pressure in the space of the closure part surrounded with the interposed film and a bag body film can be prevented from rising. SOLUTION: In the plastic zipper wherein female claws (a) and male claws (b) are provided on a tape-shaped zipper base or film, an interposed film 7 is interposed between the claws (b) and the claws (a) over the entire length of an engaging part of the zipper to form spaces 5, 6 by means of a zipper forming base part and the film 7. A plurality of air holes 3, 4 are provided through the zipper forming base part and/or the interposed film 7 so as to communicate with the spaces and bag body and/or the atmosphere, so that the zipper is closed or opened through the film 7.
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