From a container blank shaped container with improved opening characteristics by stretch heat treatment of polymer layers

The present invention relates to a method of manufacturing the container interior (1) of the area (2) delimiting the container (3) at least partially formed from a flat composite (4), comprising the steps of: (I) providing a sheet-like composite (4) in the form of a precursor container (3a) for a single container (3); (II) forming the container (3) from the container precursor (3a); (III) closing the container (3); wherein the sheet-like composite (4) includes a composite components: - one of the area (2) facing polymer outer layer (4_1); - one on the polymeric outer layer (4_1) to the tank interior (1) towards the following backing layer (4_2); - a to the carrier layer (4_2) to the tank interior (1) towards the following barrier layer (4_3); - one on the barrier layer (4_3) to the tank interior (1) towards the following adhesive layer (4_4); - one on the adhesive layer (4_4) to the tank interior (1) towards the following polymer inner layer (4_5); and wherein the sheet-like composite (4) in the form of a container precursor (3a) is obtainable by a process involving the process steps a. Providing a at least the carrier layer (4_3) comprising composite precursor (3a); b. Applying the adhesive layer (4_4) and the polymer inner layer (4_5) by extrusion coating; c. Preparing a precursor container for a single container; wherein at least the polymer inner layer (4_5) or at least the adhesive layer (4_4) or at least both be stretched during application, wherein the support layer (4_2) comprises a hole (5), at least with the barrier layer (4_3), the adhesive layer (4_4) and the inner polymer layer (45) is covered as a perforated cover layers (6), and at least one of a stretched polymer-containing hole cover layers (6) after forming the precursor container (3a) is thermally treated.