Flexible packaging structure with a built-in opening and reclose feature
A flexible packaging laminate is formed to have a built-in opening and reclose feature by forming the laminate as a two-part structure having an outer structure joined in face-to-face relation with an inner structure. Score lines are formed in both structures to enable an opening to be formed through the laminate by lifting an opening portion (e.g., a flap or the like) of the two structures 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.
1. A resealable packaging structure for housing products wherein the entire packaging structure comprises a laminate comprising an outer layer and an inner layer that are coextensive across substantially their entire areas, each of the layers having an upper surface and a lower surface and wherein, other than in an unadhered tab portion of the outer layer, the outer layer lower surface is adhered to the inner layer upper surface over substantially their entire surfaces, the laminate further comprising a repeatedly openable and closeable flexible structure which comprises, prior to initial opening:
a first score line in the laminate defining an outer layer opening portion and a second score line in the laminate defining an inner layer opening portion wherein the outer layer opening portion is larger in area than the inner layer opening portion and extends beyond a periphery of the inner layer opening portion, and wherein the outer layer opening portion comprises the tab portion;
the inner layer upper surface comprising a first marginal region surrounding the second laminate score line;
a non-detachable flap, the flap comprising the outer layer opening portion and the inner layer opening portion;
the outer layer lower surface comprising a second marginal region comprising at least a portion of a periphery of the outer layer opening portion lower surface; and
the first marginal region being releasably and resealably adhered to the second marginal region.
2. The resealable packaging structure of claim 1 wherein the tab portion extends beyond the first and second marginal regions.
3. The resealable packaging structure of claim 1 wherein the outer layer lower surface and the inner layer upper surface are adhered over their entire surfaces, other than the tab portion, via a pressure-sensitive adhesive.
4. The resealable packaging structure of claim 1 wherein the outer layer lower surface and the inner layer upper surface are adhered over substantially their entire surfaces via a pressure-sensitive adhesive.
5. The resealable packaging structure of claim 1 wherein the inner layer is scored only through a portion thereof.
6. The resealable packaging structure of claim 1 wherein the outer layer is scored only through a portion thereof.
7. The resealable packaging structure of claim 1 comprising only pressure-sensitive adhesive and no permanent laminating adhesive.
8. The resealable packaging structure of claim 1 wherein the inner layer comprises a barrier layer and a sealant layer, the sealant layer forming an inner surface of the laminate.
9. The resealable packaging structure of claim 8 wherein the sealant layer comprises a heat seal material.
10. The resealable packaging structure of claim 1 wherein the outer layer comprises polyester terephthalate.
11. The resealable packaging structure of claim 1 wherein the laminate has a uniform thickness throughout.
12. The resealable packaging structure of claim 1 wherein the packaging structure comprises a tubular shape with a first longitudinal edge sealed to a second longitudinal edge, a first transverse seal at a first end of the tubular shape, and a second transverse seal at a second, opposite end of the tubular shape.
13. The resealable packaging structure of claim 1 wherein the flap is provided on a top surface of the packaging structure.
14. The resealable packaging structure of claim 13 wherein the flap comprises a majority of the total surface area of the top surface of the packaging structure.
15. The resealable packaging structure of claim 1 additionally comprising a metallization layer between the inner layer and the outer layer.
16. A resealable packaging structure for housing products wherein the entire packaging structure comprises a laminate comprising an outer layer and an inner layer that are coextensive across substantially their entire areas, each of the layers having an upper surface and a lower surface and wherein, other than in an unadhered tab portion of the outer layer, the outer layer lower surface is adhered to the inner layer upper surface over substantially their entire surfaces with a pressure sensitive adhesive, the laminate further comprising a repeatedly openable and closeable flexible structure which comprises:
a first opening in the laminate defined by an outer layer score line and a second opening in the laminate defined by an inner layer score line wherein the first opening is larger in area than the second opening and extends beyond a periphery of the second opening;
the inner layer upper surface comprising a first marginal region surrounding the second laminate opening;
a non-detachable flap, the flap comprising a first portion of the outer layer within the outer layer score line and a second portion of the inner layer within the inner layer score line;
the outer layer lower surface comprising a second marginal region comprising at least a portion of a periphery of the first portion of the outer layer within the outer layer score line; and
the first marginal region being releasably and resealably adhered to the second marginal region.
17. The resealable packaging structure of claim 16 wherein the tab portion extends beyond the first and second marginal regions.
18. The resealable packaging structure of claim 16 comprising no permanent laminating adhesive.