Two-ply sealing element punched out in a cover shape
An element which is punched out in a cover shape for sealing of containers, includes two plies with at least one opening aid which is integrated within these plies, the ply ( 3 ) located in the direction of the container having a plastic layer which is provided with perforations or scoring. The layers of the sealing element are cemented by a peelable adhesive layer, the opening aid and the ply which has the plastic layer being free of adhesive in the area of its perforations or scoring. The sealing element enables not only facilitated sealing of food containers, such as microwave containers, since mutual displacement or slippage of the individual plies due to the adhesive layer is prevented, but that any type of penetration of adhesive into the food container, thus into the food, is prevented in any case by the peelability of the adhesive.
1. A combined container and cover element ( 1 ) for sealing of the container ( 19 ), the combined container and cover element comprising:
a container having a top end;
a cover sealed to the top end of the container, wherein the cover comprises:
a first ply ( 3 ) comprising a plastic layer ( 5 ) having an upper surface and a lower surface;
a second ply ( 2 );
a peelable adhesive layer ( 4 ) removably adhering the upper surface of the plastic layer of the first ply to the second ply, the peelable adhesive layer providing a seal seam strength produced between the first and second plies;
at least one opening aid ( 20 ) integrated within an adhesive-free area of the first and second plies; and
one of perforations and scoring ( 6 ) provided in the plastic layer of the first ply ( 3 );
wherein the first ply is a bottom layer closest to the container and the lower surface of the plastic layer is provided with a hot-sealable layer for sealing to the top end of the container, the hot-sealable layer having a seal seam strength which is greater than the seal seam strength provided by the peelable adhesive layer, and
wherein adhesive does not contact the one of the perforations and the scoring on a side of the first layer farthest from the container such that the upper surface of the plastic layer of the first ply ( 3 ) is free of adhesive in areas above and immediately surrounding the one of the perforations and the scoring ( 6 ).
2. The element of claim 1 , wherein the adhesive layer ( 4 ) comprises polyurethane cement.
3. The element of claim 1 , wherein the first and second plies ( 2 , 3 ) comprise single or compound materials.
4. The element of claim 1 , wherein the second ply ( 2 ) is furthest from the container and comprises a metal foil.
5. The element of claim 1 , wherein the plastic layer ( 5 ) comprises plastics selected from the group consisting of polypropylene, polyethylene, polyester, polyacrylate, polyamide, polystyrene and copolymers formed therefrom.
6. The element of claim 1 , wherein the second ply ( 2 ) is furthest from the container and on a surface side facing the peelable adhesive layer is provided with a hot-sealable layer ( 8 ).
7. The element of claim 1 , wherein the second ply ( 2 ) is furthest from the container and on a side facing away from the peelable adhesive layer has typography.
8. The element of claim 1 , wherein the second ply ( 2 ) comprises an aluminum foil.
9. The element of claim 1 , wherein the second ply ( 2 ) is furthest from the container and on a side farthest from the peelable adhesive layer has typography with a superficially rough configuration.
10. The element of claim 1 , wherein the hot-sealable layer ( 9 ) has a rough surface.
11. The element of claim 10 , wherein the hot-sealable layer ( 9 ) is present in the form of geometrically arranged spacers ( 11 ).
12. The element of claim 1 , wherein the opening aid ( 20 ) has the form of a pull tab.
13. The element of claim 12 , wherein the pull tab ( 20 , 20 ′) is present in both the first and second plies.
14. An element ( 1 ) sealing a container ( 19 ), comprising:
a first ply ( 3 ) comprising a plastic layer ( 5 ), the plastic layer comprising one of perforations and scoring and having an upper surface and a lower surface, the upper surface of the first ply being free of any adhesive at the one of the perforations and the scoring;
a second ply ( 2 ) with an upper surface and a lower surface;
a peelable adhesive layer ( 4 ) comprising an adhesive removably adhering the upper surface of the plastic layer of the first ply to the lower surface of the second ply, the peelable adhesive layer providing a seal seam strength produced between the first and second plies;
the adhesive layer comprising plural adhesive areas and plural adhesive-free areas, the adhesive areas of the adhesive layer contacting the upper surface of the plastic layer of the first ply in areas other than at the one of the perforations and the scoring and the adhesive layer not contacting the upper surface of the plastic layer of the first ply in areas of the one of the perforations and the scoring; and
an opening aid ( 20 ) integrated within an adhesive-free area of the first and second plies,
wherein the upper surface of the first ply ( 3 ) is free of the adhesive in the areas of the one of the perforations and the scoring ( 6 ); and
a container ( 19 ), wherein,
the first layer is a bottom layer closest to the container, and
the first layer is attached to the container.
15. The element ( 1 ) sealing the container ( 19 ) of claim 14 , wherein,
the second ply ( 2 ) is furthest from the container and comprises a metal foil,
the plastic layer ( 5 ) comprises plastics selected from the group consisting of polypropylene, polyethylene, polyester, polyacrylate, polyamide, polystyrene and copolymers formed therefrom,
the second ply ( 2 ), on a surface side facing the peelable adhesive layer, comprises a hot-sealable layer ( 8 ),
the plastic layer ( 5 ), on a side closest to the container, comprises a hot-sealable layer ( 9 ) with a seal seam strength greater than a seal seam strength between the first and second plies, and
the opening aid ( 20 ) has the form of a pull tab and is present in both the first and second plies.