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Zipper slider insertion through split track
NO.:1290  Date:2010-9-3

In a continuous bag-making process, the film and zipper track moves intermittently through a bag machine in a continuous stream, so there is no end to the zipper track on which the slider can be inserted. In the present invention, in the intermittent motion-part of the bag machine, the zipper is cut apart at the location that is to be the edge of the bag, the ends formed by the cutter moved laterally relative to each other exposing the ends and the slider is inserted over one of the exposed ends.


Inserting a slider over one of the exposed ends prior to severing the bag material from the remaining continuous web, and thereafter continuing the movement of the zipper and web of bag material for a distance corresponding to a predetermined width of the zippered plastic bag to advance a new section of the zipper to the zipper severing station.


In a continuous process for making zippered plastic bags, the steps of moving along a predetermined path a continuous web of plastic bag material having a plastic zipper profile attached to one edge thereof, severing the zipper at a station along the path to produce adjacent cut ends in the zipper, moving the cut ends of the zipper laterally relative to each other to expose the ends, and inserting a slider over one of the exposed ends prior to severing the bag material from the remaining continuous web.


Plastic reclosable fasteners or zippers with sliders are well known in the art. The plastic zippers have profiles and include a pair of male and female fastener elements in the form of reclosable interlocking rib and groove elements with a slider riding on the zipper for opening and closing the rib and groove elements. Sliders are generally of a U-shaped configuration having inwardly extending shoulders at the open end of the U to maintain the slider on the zipper as the slider is moved from one end to the other of the zipper. In the manufacture of thermoplastic film bags, a pair of the male and female fasteners extend along the mouth of the bags and these male and female elements are adapted to be secured in any suitable manner to the flexible walls of the thermoplastic film bags. These elements may be integral marginal portions of such walls or they may be extruded separately and thereafter attached to the walls along the mouth of the bag.


For reasons of economy, it is desirable to make the zippered plastic bags by a continuous bag making process. In such process a continuous web of plastic bag material having a plastic zipper profile attached to one edge thereof is moved along a predetermined path. The movement of the zipper and web bag material is periodically interrupted to assemble the slider with the zipper by a relative transverse maneuver and to concurrently form a side seal across the thermoplastic sheets between adjacent bags and to sever the completed bag from the end of the continuous web of plastic bag material.


While sliders have heretofore been assembled endwise with zippers, this method of assembly does not lend itself to a continuous bag making process. It would be desirable to utilize an endwise assembly of a slider on a zipper in a continuous bag making process and thus permit the use of a relatively strong plastic one-piece slider which is structurally stronger than one that has to be assembled transversely on the bag line.


It is an object of the present invention to provide a continuous process and system for making zippered plastic bags wherein the zipper slider is inserted onto a continuous zipper track by cutting the track, moving adjacent parts of the track apart, and inserting the slider over one exposed end.


The present invention relates to a continuous process of making zippered plastic bags comprising the steps of moving along a predetermined path, a continuous web of plastic bag material having a plastic zipper profile attached to one edge thereof, periodically interrupting the movement of the zipper and web of bag material along the path, while the movement is interrupted severing the zipper at a station along the path to produce adjacent cut ends in the zipper, moving the cut ends of the zipper laterally relative to each other to expose the ends, inserting a slider over one of the exposed ends, and thereafter continuing the movement of the zipper and web of bag material for a distance corresponding to a predetermined width of the zippered plastic bag to advance a new section of the zipper to the zipper severing station.


In a conventional continuous bag-making process, the film web and zipper track moves intermittently through the bag machine in a continuous stream, so there is no end to the zipper track onto which the slider can be inserted. Under the present invention, during the intermittent motion-part of the bag machine, the zipper is cut apart at the location that is to be the edge of the bag, the ends formed by the cutter moved laterally relative to each other exposing the ends, and the slider is inserted over one of the exposed ends.

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