Container formed from a roll and having improved opening properties as a result of stretching heat treatment of polymer layers

A process for the production of a container that delimits a container interior from the surroundings and that is formed at least in part from a sheet-like composite, comprising the process steps:

• (I) providing a sheet-like composite on a roll;
• (II) forming the container from the sheet-like composite from the roll;
• and
• (III) closing the container;
• wherein the sheet-like composite comprises:
• (i) a polymer outer layer facing the surroundings;
• (ii) a carrier layer following the polymer outer layer in the direction of the container interior;
• (iii) a barrier layer following the carrier layer in the direction of the container interior;
• (vi) an adhesive layer following the barrier layer in the direction of the container interior;
• and
• (v) a polymer inner layer following the adhesive layer in the direction of the container interior;
• wherein the sheet-like composite is obtained on a roll by a process comprising the process steps:
• (a) providing a composite precursor containing at least the carrier layer;
• (b) applying the adhesive layer and the polymer inner layer by laminating extrusion to the composite precursor;
• and
• (c) rolling up the sheet-like composite on the roll;
• wherein at least the polymer inner layer, at least the adhesive layer, or at least both are stretched during the application to produce a stretched polymer layer,
• wherein the carrier layer has a hole that is covered at least with the barrier layer, the adhesive layer and the polymer inner layer as hole-covering layers, and
• wherein at least one of the hole-covering layers comprising a stretched polymer layer is subjected to heat treatment.