Abstract: The present invention includes a method and apparatus wherein webless zipper is provided with concave seal bridges. These concave seal bridges are complementary in shape to convex sealing bars. This captures or positions the seal bridges of the zipper profiles resulting in improved alignment of the profiles and improved performance of the manufacturing apparatus.

Abstract: The present invention includes a method and apparatus wherein webless zipper is provided with concave seal bridges. These concave seal bridges are complementary in shape to convex sealing bars. This captures or positions the seal bridges of the zipper profiles resulting in improved alignment of the profiles and improved performance of the manufacturing apparatus.

Abstract: A method of manufacture comprising the following steps: (a) guiding a web material in a machine direction through a vertical form-fill-seal (VFFS) machine with a portion or portions of the web material being wrapped around a tube; (b) joining first and second flangeless zipper strips to first and second portions of the web material that do not form part of the portion or portions of the web material that are wrapped around the tube; (c) inserting a slider on the first and second flangeless zipper strips joined to the web material; (d) cross sealing the web material at a location downstream from the tube; and (e) dropping product through the tube and onto the most recently formed cross seal.

Abstract: Reclosable packages having a slider-actuated string zipper and a tamper-evident feature. In one aspect, the reclosable package comprises: a receptacle having a mouth and an interior volume; a string zipper installed in the mouth; a slider mounted to the string zipper; and a tamper-evident feature that blocks access to all or a portion of the interior volume. The tamper-evident feature is in the form of a strip of double-sided adhesive tape adhered to opposing walls of the receptacle to form a hermetic seal that partitions the interior volume of the receptacle. During manufacture of one embodiment, the adhesive tape with a release paper on one side is unwound from a reciprocating spool; the exposed side is pressed against a web of film; the release paper is removed; the web of film is folded; and then the folded-over portion of the web is pressed against the other side of the adhesive tape. A pair of zipper strips are also joined to the web in parallel with the adhesive tape.