Die cut opening for multi-layer flexible package
A reclosable package is described that includes inner and outer film layers. Each of the inner and outer film layers includes die cuts that are designed to create a peelable flap portion that, when pulled back by the user, reveals an opening of the package for providing access to the contents of the package. In particular, the inner film layer has an inner die cut that includes a cross-directional cut line. While the cross-directional cut line in conventional packages is a straight line, the package described herein uses a line that has one or more radii of curvature. In this way, the vibrations that may otherwise be generated during the rotary die cutting process are reduced, and more consistent cut depths can be achieved.
1. A package comprising:
a laminate defining an outer film layer and an inner film layer, wherein the outer film layer and the inner film layer are coextensive;
the outer film layer comprising an outer die cut, wherein the outer die cut extends within the outer film layer, wherein the outer die cut defines a peripheral edge of a peelable flap portion of the package, and wherein the outer die cut comprises:
an outer layer first cross-directional cut line; and
outer layer first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the outer layer first cross-directional cut line, respectively;
the inner film layer comprising an inner die cut, wherein the inner die cut extends within the inner film layer, wherein the inner die cut defines a location of an opening of the package and is formed inwardly of the outer die cut, wherein the inner die cut has only one axis of symmetry and comprises:
an inner film first cross-directional cut line;
inner film first and second longitudinal cut lines extending uninterrupted lengthwise from opposite ends of the inner film first cross-directional cut line, respectively; and
an uninterrupted inner film second cross-directional cut line, opposite the first cross-directional cut line, connecting the inner film first and second longitudinal cut lines and extending away from the inner film first cross-directional cut line, wherein the inner film second cross-directional cut line has multiple non-zero radii of curvature between its juncture with the inner film first and second longitudinal cut lines, and
wherein the inner film second cross-directional cut line has a first non-zero radius of curvature at the juncture of the inner film first longitudinal cut line with the second cross-directional cut line a second non-zero radius of curvature at the juncture of the second longitudinal cut line with the second cross-directional cut line, and a third non-zero radius of curvature along the inner film second cross-directional cut line between the first juncture and the second juncture, wherein the first second and third non-zero radii of curvature are part of the multiple non-zero radii of curvature,
wherein the inner film first and second longitudinal cut lines are generally parallel to a longitudinal axis, and the outer layer first and second longitudinal cut lines are generally parallel to the longitudinal axis, when the peelable flap portion of the package is in a closed configuration,
wherein the inner die cut has a depth less than a thickness of the inner film, with a consistent tolerance of about +/−6 microns, and
wherein the inner film first cross-directional cut line comprises at least one package integrity feature which extend toward the inner film second cross-directional cut line and terminate in hooked ends.
2. The package of claim 1 , wherein the inner film first cross-directional cut line, the inner film first longitudinal cut line, the inner film second longitudinal cut line, and the inner film second cross-directional cut line do not form a closed shape.
3. The package of claim 1 , additionally comprising at least one arched cut line disposed in the inner film, wherein the at least one arched cut line is spaced from the hooked ends of the at least one package integrity feature.
4. The package of claim 3 , wherein one arched cut line is spaced from two hooked ends of the at least one package integrity feature.
5. The package of claim 1 , wherein the hooked ends of the at least one package integrity feature are directed away from each other.
6. The package of claim 1 , wherein the inner film first cross-directional cut line has a first non-zero radius of curvature at the juncture of the inner film first longitudinal cut line with the inner film first cross-directional cut line and a second non-zero radius of curvature at the juncture of the second longitudinal cut lines with the inner film first cross-directional cut line.
7. The package of claim 1 , wherein the inner film first cross-directional cut line has multiple non-zero radii of curvature between its juncture with the inner film first and second longitudinal cut lines.
8. The package of claim 1 , wherein the peelable flap portion is configured to be pulled back to reveal an opening into the package.
9. The package of claim 8 , wherein the first cross-directional cut line defines an origination of the package opening as the peelable flap portion is pulled back.
10. The package of claim 1 , wherein the first and second longitudinal cut lines are straight lines.
11. A package comprising:
a laminate comprising an outer film layer and an inner film layer, wherein the outer film layer and the inner film layer are coextensive;
the outer film layer comprising an outer die cut, wherein the outer die cut extends within the outer film layer, wherein the outer die cut defines a peripheral edge of a peelable flap portion of the package, and wherein the outer die cut comprises:
an outer layer first cross-directional cut line; and
outer layer first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the outer layer first cross-directional cut line, respectively;
the inner film layer-comprising an inner die cut, wherein the inner die cut extends within the inner film layer, wherein the inner die cut defines a location of an opening of the package and is formed inwardly of the outer die cut, wherein the inner die cut has only one axis of symmetry and comprises:
an inner film first cross-directional cut line;
inner film first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the inner film first cross-directional cut line, respectively; and
an inner film second cross-directional cut line, opposite the first cross-directional cut line, connecting the inner film first and second longitudinal cut lines and extending away from the inner film first cross-directional cut line, wherein the inner film second cross-directional cut line has multiple non-zero radii of curvature between its juncture with the inner film first and second longitudinal cut lines, and
wherein the inner film second cross-directional cut line has a first non-zero radius of curvature at the juncture of the inner film first longitudinal cut line with the second cross-directional cut line a second non-zero radius of curvature at the juncture of the second longitudinal cut line with the second cross-directional cut line, and a third non-zero radius of curvature along the inner film second cross-directional cut line between the first juncture and the second juncture, wherein the first, second and third non-zero radii of curvature are part of the multiple non-zero radii of curvature,
wherein the inner film first and second longitudinal cut lines are generally parallel to a longitudinal axis, and the outer layer first and second longitudinal cut lines are generally parallel to the longitudinal axis, when the peelable flap portion of the package is in a closed configuration,
wherein inner die cut has a depth less than a thickness of the inner film, with a consistent tolerance of about +/−6 microns, and
wherein the outer film first cross-directional cut line comprises a plurality of package integrity features which extend away from the inner film first cross-directional cut line.
12. The package of claim 11 , wherein the inner film first cross-directional cut line comprises at least one package integrity feature which extends toward the inner film second cross-directional cut line and terminate in hooked ends.
13. The package of claim 12 , additionally comprising at least one arched cut line disposed in the inner film, wherein the at least one arched cut line is spaced from the hooked ends of the at least one package integrity feature.
14. The package of claim 13 , wherein one arched cut line is spaced from two hooked ends of each of the at least one package integrity feature.
15. The package of claim 12 , wherein the hooked ends of the at least one package integrity feature are directed away from each other.
16. The package of claim 11 , wherein the inner film first cross-directional cut line, the inner film first longitudinal cut line, the inner film second longitudinal cut line, and the inner film second cross-directional cut line do not form a closed shape.
17. The package of claim 11 , wherein the inner film first cross-directional cut line has a first non-zero radius of curvature at the juncture of the inner film first longitudinal cut line with the inner film first cross-directional cut line and a second non-zero radius of curvature at the juncture of the inner film first longitudinal cut lines with the second cross-directional cut line.
18. The package of claim 11 , wherein the inner film first cross-directional cut line has multiple non-zero radii of curvature between its juncture with the inner film first and second longitudinal cut lines.
19. The package of claim 11 , wherein the first cross-directional cut line defines an origination of the package opening as the peelable flap portion is pulled back.
20. A package comprising:
a laminate defining an outer film layer and an inner film layer, wherein the outer film layer and the inner film layer are coextensive;
the outer film layer comprising an outer die cut, wherein the outer die cut extends within the outer film layer, wherein the outer die cut defines a peripheral edge of a peelable flap portion of the package, and wherein the outer die cut comprises:
an outer layer first cross-directional cut line; and
outer layer first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the outer layer first cross-directional cut line, respectively;
the inner film layer comprising an inner die cut, wherein the inner die cut extends within the inner film layer, wherein the inner die cut defines a location of an opening of the package and is formed inwardly of the outer die cut, wherein the inner die cut has only one axis of symmetry and comprises:
an inner film first cross-directional cut line;
inner film first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the inner film first cross-directional cut line, respectively; and
an inner film second cross-directional cut line, opposite the first cross-directional cut line, connecting the inner film first and second longitudinal cut lines and extending away from the inner film first cross-directional cut line, wherein the inner film second cross-directional cut line has multiple non-zero radii of curvature between its juncture with the inner film first and second longitudinal cut lines, and
wherein the inner film second cross-directional cut line has a first non-zero radius of curvature at the juncture of the inner film first longitudinal cut line with the second cross-directional cut line a second non-zero radius of curvature at the juncture of the second longitudinal cut line with the second cross-directional cut line, and a third non-zero radius of curvature along the inner film second cross-directional cut line between the first juncture and the second juncture, wherein the first second and third non-zero radii of curvature are part of the multiple non-zero radii of curvature, and
wherein the inner die cut has a depth less than a thickness of the inner film, with a consistent tolerance of about +/−6 microns.