Tubular plastic end stops bonded to plastic zipper
AssigneeMobil Oil Corporation
InventorsDale S. Richardson, Roger W. Smith
Life of this patent
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Abstract
Plastic-film zipper bags having tubular plastic end stops bonded to the plastic zipper to seal the ends of the zipper and to provide stops to retain a slider on the zipper are disclosed. Also disclosed is a method of installing the tubular plastic end stops on the zipper.
Claims6
In the manufacture of plastic-film bags having a reclosable fastener extending along the mouth of the bag and a slider straddling the fastener for opening and closing the fastener, the fastener comprising a pair of flexible plastic strips on the facing sidewalls of the bag and having reclosable interlocking rib and groove profile elements on the respective strips, the improvement in a method for applying end stops for the slider and terminating the reclosable fastener comprising:
- feeding a predetermined length of slit plastic tubing along a guide to an assembly station,
- feeding continuous plastic material for bags having reclosable interlocking male and female profile elements extending along the mouth of the bag material to the assembly station,
- positioning the slit in the plastic tubing so that a length of the tubing can pass over the interlocked profiles of the reclosable fastener on the continuous bag material which moves therebeneath,
- at a clamp-bonding station, positioning the length of the slit plastic tubing with respect to the separation line of the preceding bag in the continuous bag material, and
- clamping and bonding the slit plastic tubing into locked position on the interlocked profiles of the reclosable fastener.
Dependencies are inferred from the claim text.