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:
a) a permanently adhered portion and a releasably adhered portion;
b) a first opening in the laminate defined by an outer layer opening portion and a second opening in the laminate defined by 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;
c) a non-detachable flap having a releasable perimeter that is resealable to the inner layer upper surface, the flap comprising the outer layer opening portion and the inner layer opening portion and wherein the inner layer opening portion of the flap has dimensions at least equal to the dimensions of the second laminate opening and wherein the outer layer opening portion of the flap has dimensions at least equal to the dimensions of the first laminate opening;
d) the inner layer upper surface comprising a first marginal region in the releasably adhered portion of the laminate and surrounding the second laminate opening;
e) the outer layer lower surface comprising a second marginal region in the releasably adhered portion of the laminate that defines the releasable perimeter; and
f) the first marginal region being releasably adhered to the second marginal region so that the flap may be repeatedly opened to allow access to the products housed within the resealable packaging structure by releasing the first and second marginal regions and repeatedly closed to prevent access to and exposure of the products by sealing the first and second marginal regions.
2. The resealable packaging structure of claim 1 wherein the inner layer opening portion of the flap has dimensions equal to the dimensions of the second laminate opening.
3. The resealable packaging structure of claim 1 wherein the outer layer opening portion of the flap has dimensions greater than the dimensions of the second laminate opening.
4. The resealable packaging structure of claim 3 wherein the tab portion extends beyond the first and second marginal regions.
5. The resealable packaging structure of claim 1 wherein the permanently adhered portion of the laminate comprises a permanent adhesive.
6. The resealable packaging structure of claim 1 wherein the releasably adhered portion comprises a pressure-sensitive adhesive.
7. The resealable packaging structure of claim 1 wherein the inner layer is a coextruded web comprising a barrier layer and a sealant layer.
8. The resealable packaging structure of claim 1 wherein the inner layer comprises a barrier layer and a sealant layer adhesively laminated together.
9. The resealable packaging structure of claim 1 wherein the flap, the inner layer opening portion, and the outer layer opening portion are created by scoring the inner layer and the outer layer.
10. The resealable packaging structure of claim 9 wherein the inner layer is scored only through a portion thereof.
11. The resealable packaging structure of claim 9 wherein the outer layer is scored only through a portion thereof.
12. The resealable packaging structure of claim 1 wherein the flap, the inner layer opening portion, and the outer layer opening portion are created by cutting the laminate.
13. The resealable packaging structure of claim 1 wherein the first marginal region and the second marginal region are in the form of a partial racetrack design.