US 11,718,461 B2
Composite material for the production of sealing foils and sealing foils made therefrom
Alfred Wegenberger, Langenlois (AT); Martin Kornfeld, Klosterneuburg (AT); Adolf Schedl, Lilienfeld (AT); and Matthias Steiner, Weinburg (AT)
Assigned to CONSTANTIA TEICH GMBH, Weinburg (AT)
Appl. No. 17/627,320
Filed by CONSTANTIA TEICH GMBH, Weinburg (AT)
PCT Filed Jul. 7, 2020, PCT No. PCT/EP2020/062735
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/008752, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 19186564 (EP), filed on Jul. 16, 2019.
Prior Publication US 2022/0274759 A1, Sep. 1, 2022
Int. Cl. B65D 77/20 (2006.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B32B 27/36 (2006.01)
CPC B65D 77/2056 (2013.01) [B32B 27/08 (2013.01); B32B 27/32 (2013.01); B32B 27/36 (2013.01); B32B 2307/7242 (2013.01); B32B 2307/748 (2013.01); B32B 2435/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A composite material for production of sealing foils for sealing a container, the composite material comprising:
an inner layer configured to face the container during sealing, the inner layer being single- or multi-layer, and including a self-contained and closed weakening line;
an outer layer that may be single- or multi-layer, and that is configured to be peeled from the inner layer
wherein an area of the inner layer delimited by the closed weakening line remains attached to the outer layer when the outer layer is peeled from the inner layer, thereby creating a hole in the inner layer;
an outermost of the inner layers is in contact with the outer layer, and includes a semicrystalline ethylene-propylene copolymer that is substantially free of dienes; and
an innermost of the outer layers is a barrier layer or a lacquer.