CONTAINER FORMED FROM A ROLL AND HAVING IMPROVED OPENING PROPERTIES AS A RESULT OF STRETCHING HEAT TREATMENT OF POLYMER LAYERS

摘要

The present invention relates to a method for producing a container (3) which delimits a container interior (1) from the surroundings (2) and is formed, at least in part, from a sheet-like composite (4), containing the following method steps: (I) supplying a sheet-like composite (4) on a roll (29); (II) forming the container (3) from the sheet-like composite (4) from the roll (29); (III) closing the container (3); wherein the sheet-like composite (4) contains, as the composite constituent parts: - an outer polymer layer (4_1), which is directed towards the surroundings (2); - a carrier layer (4_2), which follows the outer polymer layer (4_1) in the direction of the container interior (1); - a barrier layer (4_3), which follows the carrier layer (4_2) in the direction of the container interior (1); - an adhesion layer (4_4), which follows the barrier layer (4_3) in the direction of the container interior (1); - an inner polymer layer (4_5), which follows the adhesion layer (4_4) in the direction of the container interior (1); wherein the sheet-like composite (4), on a roll (29), can be obtained by a method containing the following method steps: a. supplying a composite precursor having at least the carrier layer (4_3); b. applying the adhesion layer (4_4) and the inner polymer layer (4_5) by layer extrusion; c. rolling up the sheet-like composite onto a roll (29); wherein at least the inner polymer layer (4_5) or at least the adhesion layer (4_4) or at least both is or are stretched during application, wherein the carrier layer (4_2) has a hole (5), which is covered over at least by the barrier layer (4_3), the adhesion layer (4_4) and the inner polymer layer (4_5) as perforation-covering layers (6), and wherein at least one of the perforation-covering layers (6), which contain a stretched polymer, is subjected to heat treatment.