Die cut opening for multi-layer flexible package
View Patent ↗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:
an outer film layer comprising an outer die cut, wherein the outer die cut defines a peripheral edge of a peelable flap portion of the package; and
an inner film layer laminated to the outer film layer and comprising an inner die cut, 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 comprises:
a first cross-directional cut line;
first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the first cross-directional cut line, respectively; and
a second cross-directional cut line extending continuously between the first and second longitudinal cut lines, opposite the first cross-directional cut line and extending outwardly from the first cross-directional cut line, and
wherein the second cross-directional cut line has a non-zero first radius of curvature at a location between its juncture with the first and second longitudinal cut lines, and a non-zero second radius of curvature at the juncture of each of the first and second longitudinal cut lines with the second cross-directional cut line,
wherein the second radius of curvature is between approximately 0.125-inch and approximately 0.75-inch and is smaller than the first radius of curvature, and
wherein the first and second radii of curvature are selected so as to provide a second cross-directional cut line that, although not a straight line, minimizes the curvature of the second cross-directional cut line.
2. The package of claim 1 , wherein the first cross-directional cut line, the first longitudinal cut line, the second longitudinal cut line, and the second cross-directional cut line form a closed shape.
3. The package of claim 1 , wherein the first cross-directional cut line of the inner die cut comprises at least one package integrity feature.
4. The package of claim 1 , wherein the outer die cut and the inner die cut are formed using a rotary die cutting blade.
5. The package of claim 1 , wherein a mid-section of the second cross-directional cut line is disposed further from a midpoint of the peelable flap portion than the juncture of each of the first and second longitudinal cut lines with the second cross-directional cut line is disposed from a midpoint of each of the first and second longitudinal cut lines.
6. The package of claim 1 , wherein the outer die cut includes at least one package integrity feature.
7. The package of claim 1 , wherein the peelable flap portion is configured to be pulled back to reveal an opening into the package.
8. The package of claim 7 , wherein the first cross-directional cut line defines an origination of the package opening as the peelable flap portion is pulled back.
9. The package of claim 1 , wherein the first and second longitudinal cut lines are straight lines.
10. The package of claim 1 , wherein the second cross-directional cut line extends continuously outwardly from the first and second longitudinal cut lines in a curved manner.
11. The package of claim 1 , wherein the first radius of curvature is located at the midsection of the second cross-directional cut line.
12. The package of claim 1 , wherein the first radius of curvature is located at the portion of the second cross-directional cut line closest to the longitudinal axis of the package.
13. A package comprising:
an outer film layer comprising an outer die cut, wherein the outer die cut defines a peripheral edge of a peelable flap portion of the package; and
an inner film layer laminated to the outer film layer and comprising an inner die cut, 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 comprises:
a first cross-directional cut line;
first and second longitudinal cut lines extending continuously lengthwise from opposite ends of the first cross-directional cut line, respectively; and
a second cross-directional cut line extending continuously between the first and second longitudinal cut lines, opposite the first cross-directional cut line and extending outwardly from the first cross-directional cut line, and
wherein the second cross-directional cut line has a non-zero first radius of curvature at a location between its juncture with the first and second longitudinal cut lines, and a non-zero second radius of curvature at the juncture of each of the first and second longitudinal cut lines with the second cross-directional cut line,
wherein the second radius of curvature is between approximately 0.125-inch and approximately 0.75-inch and is smaller than the first radius of curvature, and
wherein the first and second radii of curvature are selected so as to provide a second cross-directional cut line that, although not a straight line, simulates the appearance of a straight line.
14. The package of claim 13 , wherein the first radius of curvature is located at the midsection of the second cross-directional cut line.
15. The package of claim 13 , wherein the first radius of curvature is located at the portion of the second cross-directional cut line closest to the longitudinal axis of the package.
16. The package of claim 13 , wherein the first cross-directional cut line, the first longitudinal cut line, the second longitudinal cut line, and the second cross-directional cut line form a closed shape.