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US 5,259,904 AGranted
Oscillating grip strip for recloseable plastic bags and method and apparatus for making the same
AssigneeMinigrip, Inc.
InventorSteven Ausnit
Life of this patent
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Abstract
A plastic bag with a recloseable zipper-type closure is formed with grip strips on its lips to ease the opening of the bags. The grip strips are extruded from a grip strip extruder which is moved relative to a movement of the zipper type profile to produce a regularly repeating pattern. The strips facilitate opening the bag even with wet or oily fingers. A method and apparatus for forming the same is also disclosed.
Claims10
In a method of making a plastic bag with grip strips, the improvement comprising the steps of:
- providing a film material with a pair of longitudinally extending mating profiles;
- moving said film material in a first direction;
- extruding a first grip strip on said film material in an area adjacent to at least one of said mating profiles through a first grip strip extruder outlet nozzle;
- and
- moving with a reciprocating motion transverse to said longitudinally extending mating profiles at least one of said first grip strip extruder outlet nozzle and said film material with respect to the other whereby to provide an undulating pattern to said grip strip on said film material.
2 more elements
In a method of making a plastic bag with grip strips, the improvement comprising the steps of:
- providing a zipper material with a pair of mating profiles;
- moving said zipper material in a first direction;
- extruding a first grip strip on said zipper material through a first grip strip extruder outlet nozzle and,
- additionally moving with a reciprocating motion transverse to said first direction at least one of said first grip strip extruder outlet nozzle and said zipper material with respect to one another whereby to provide a pattern to said grip strip on said zipper material.
1 more element
Dependencies are inferred from the claim text.