The cork covering capsule, which usually contains an imprint pointing to the wine or producer. This capsule is the uppermost part of the bottle neck closely enclosing foil. This will be the cork from dehydration, pollution with for example bacteria as well as infestation by the Korkmotte and their oviposition protected and also the OTR rate (Gas exchange) between bottle contents and outside world or access of oxygen slowed down. Last but not least, this also achieves a decorative purpose.
The capsule can be made of different materials. The formerly common toxic lead capsule, which has been called trivializing also as Stanniolkapsel (originally a lead silver alloy), is forbidden in the meantime in viticulture. Today, the capsule is made of neutral, non-toxic tin (also known as stanniol), the much cheaper but not so close to the bottleneck aluminum, but also especially for simple wines made of plastics such as PET. polyethylene. PVC or PVDC manufactured.
Before the cork is pulled, the foil has to be cut all around with a capsule cutter (picture left with the four round rolling knives in the cutting sheet) and then the capsule hat removed (middle picture). But there are also films with a tab, by means of which all around the capsule hat can be exposed and then removed (arrow in the picture right). For sparkling wine bottles is located between Agraffe (Wire mesh) and cork a metal capsule. Collecting these items coveted in the scene is called Placomusophilie designated. See also other alternative bottle closure forms below closures as well as under Weingenuss,