This invention relates to a snap zipper, a bag with a snap zipper, manufacture method and apparatus for a bag with a snap zipper, and bagging method and apparatus for a bag with a snap zipper. A hot-welded portion of the snap zipper comprising a male member and a female member is formed of ionomer resin...http://www.google.ca/patents/US5400568?utm_source=gb-gplus-sharePatent US5400568 - Method and apparatus for making and filling a bag
