Flexible packaging structure with built-in tamper-evidence features and method for making same
A flexible packaging laminate has built-in opening/reclose and tamper-evidence features by forming the laminate from an outer structure joined in face-to-face relation to an inner structure. Score lines are formed in both structures to enable an opening to be formed through the laminate by lifting a flap or the like out of the plane of the laminate. The score line through the outer structure defines a larger opening than the score line through the inner structure, such that a marginal region of the outer structure extends beyond the edge of the opening portion of the inner structure. A pressure-sensitive adhesive is used to re-adhere the marginal region to an underlying surface of the inner structure adjacent the opening through the laminate. The outer score line includes at least one tear portion that is torn through upon initial opening, thus indicating the package has been at least partially opened.
1. A laminate for packaging, the laminate comprising:
a first structure comprising at least one layer of flexible material, wherein a surface of the first structure comprises a pressure-sensitive adhesive;
a second structure adhesively laminated to the first structure, wherein the second structure comprises at least one layer of flexible material, and wherein one of the first structure and the second structure comprises an outer structure and the other comprises an inner structure;
an outer score line extending through a first thickness of the outer structure, wherein the outer score line delineates an outer opening portion of the outer structure that is separable from the outer structure along the outer score line;
an inner score line extending through a second thickness of the inner structure, the inner score line being in registration with the outer score line, wherein the inner score line delineates an inner opening portion of the inner structure that is affixed to the outer opening portion and is separable from the inner structure along the inner score line, wherein a region of the outer opening portion between the outer and inner score lines is attached to an underlying surface of the inner structure via the pressure-sensitive adhesive, wherein the outer opening portion is peelable from the underlying surface of the inner surface so as to cause the inner opening portion to also be peeled back to create an opening in the laminate, and wherein the outer opening portion is re-attachable to the underlying surface of the inner structure via the pressure-sensitive adhesive for reclosing the opening; and
a tab disposed within at least one heat seal region.
2. The laminate of claim 1 , wherein the laminate further comprises a tamper-evidence feature in the outer structure that is initially in an untorn condition prior to initial creation of the opening, and whose untorn condition is apparent from a visual inspection of the outer structure.
3. The laminate of claim 1 , wherein the tab has an indentation.
4. The laminate of claim 1 , wherein the tab has a prong extending from a side of the tab.
5. The laminate of claim 1 , wherein the tab is free from adhesion or lamination to the inner structure.
6. A laminate for packaging, the laminate comprising:
a first structure comprising at least one layer of flexible material, wherein a surface of the first structure comprises a pressure-sensitive adhesive;
a second structure adhesively laminated to the first structure, wherein the second structure comprises at least one layer of flexible material, and wherein one of the first structure and the second structure comprises an outer structure and the other comprises an inner structure;
at least one outer line of weakness formed in the outer structure of the laminate defining a perimeter of an outer flap;
at least one inner line of weakness formed in the inner structure of the laminate, wherein the at least one inner line of weakness is formed inwardly of the at least one outer line of weakness, defining an inner flap portion, the inner flap portion creating an opening when the lines of weakness are opened, wherein the inner flap portion is adhered to the outer flap portion;
a marginal region defined by the area of the outer flap extending beyond the inner flap portion, wherein a pressure-sensitive adhesive is disposed about the marginal region; and
a tab defined by the at least one outer line of weakness and disposed in an end seal portion.
7. The laminate of claim 6 , wherein the laminate further comprises a tamper-evidence feature in the outer structure that is initially in an untorn condition prior to initial creation of the opening, and whose untorn condition is apparent from a visual inspection of the outer structure.
8. The laminate of claim 6 , wherein the tab has an indentation.
9. The laminate of claim 6 , wherein the tab has a prong extending from a side of the tab.
10. The laminate of claim 6 , wherein the tab is free from adhesion or lamination to the inner structure.
11. A package comprising:
a flexible laminate comprising an outer structure adhesively joined to an inner structure;
a first permanent seal region which extends longitudinally from a first end of the packaging structure, and a second permanent seal region which extends longitudinally from a second end of the packaging structure, wherein the first permanent seal region and the second permanent seal region are each configured to seal an opposite end of the package;
at least one outer line of weakness formed in the outer structure of the laminate defining a perimeter of an outer flap;
at least one inner line of weakness formed in the inner structure of the laminate, wherein the at least one inner line of weakness is formed inwardly of the at least one outer line of weakness, defining an inner flap portion, the inner flap portion creating an opening into the package when the lines of weakness are opened, wherein the inner flap portion is adhered to the outer flap portion;
a marginal region defined by the area of the outer flap extending beyond the inner flap portion, wherein a pressure-sensitive adhesive is disposed about the marginal region; and
a tab defined by the at least one outer line of weakness, wherein at least an edge of the tab overlaps at least one portion of either the first permanent seal region or the second permanent seal region.
12. The package of claim 11 , wherein substantially all of the tab overlaps the at least one portion of either the first permanent seal region or the second permanent seal region.
13. The package of claim 11 , wherein the tab is disposed exterior to the marginal region.
14. The package of claim 11 , wherein the tab additionally comprises at least one tamper-evidence feature that is initially in an untorn condition prior to initial creation of the opening, and whose untorn condition is apparent from a visual inspection of the outer structure, wherein the tamper-evidence feature is torn through upon initial creation of the opening through the package.
15. The package of claim 11 , wherein the tab further comprises a prong extending from a side of the tab.
16. The package of claim 11 , wherein the tab is free from adhesion or lamination to the inner structure.
17. The package of claim 11 , wherein the first permanent seal region, the second permanent seal region, or both, is a heat seal.
18. The package of claim 11 , wherein the first permanent seal region, the second permanent seal region, or both, is a cold seal.
19. The package of claim 11 , wherein the first permanent seal region, the second permanent seal region, or both, comprises an adhesive seal.
20. The package of claim 11 , wherein at least part of the tab is anchored within the first permanent seal region and the first permanent seal region comprises a heat seal.