Primary packaging

A primary packaging for a liquid comprising:

• a partially collapsible container comprising an interior space defined by a top-side foil and a rear-side foil and bounded by a weld region where the top-side foil and rear-side foil are welded together;
• a connector element fabricated from a cyclic olefin polymer and having a single connector channel that allows for connection of the primary packaging to a withdrawal device, where the connector element tapers obtusely toward the interior space when viewed from a filling direction and the single connector channel comprises a narrowing pipe defining a mouth having a sealing lip projecting into the interior space;
• and
• an insertable cup-shaped plug that is fitted into the single connector channel and is in a press fit engagement with the sealing lip, where the cup-shaped plug is a multi-layered single part comprising an elastically deformable seal material layer and a septum layer fabricated from a cyclic olefin copolymer using a two-component injection molding process, where the septum layer is co-molded to form a hollow cylinder with a bottom that defines a flat bottom of the cup-shaped plug in fluid communication with the single connector channel, where the elastically deformable seal material layer fills the hollow cylinder, is attached to the septum, and covers a top portion of the septum layer to prevent leaks when a cannula has pierced the septum layer,
• wherein the interior space, during intended use of the primary packaging, comes into direct contact with the liquid,
• wherein the top-side foil and the rear-side foil are formed from a first plastic comprising cyclic olefin polymer and a cyclic olefin elastomer and the connector element is formed from a second plastic comprising cyclic olefin polymer and a cyclic olefin elastomer, a relative fraction of cyclic olefin polymer in the first plastic is lower, and a relative fraction of cyclic olefin elastomer is higher, than in the second plastic, and
• wherein the connector element further comprises a sealing bead positioned between the top-side foil and the rear-side foil, wherein the sealing bead is formed as a comb-shaped protuberance along a periphery of the connector element and extending around the mouth, and wherein each prong of the comb-shaped protuberance extends from a bottom surface of the connector element in a direction towards the interior space without entering the interior space, and wherein an end of each prong of the comb-shaped protuberance extends beyond the connector element towards the interior space such that the end of each prong of the comb-shaped protuberance is visible in a longitudinal cross-section through the connector element as a semicircular protuberance.