Stopper for a bottle and sealing element for said stopper

A method of sealing a bottle designed for commercial bottling of a beverage or liquid food using a system comprising a stopper and a sealing element,

• the stopper comprising a stopper part for introduction into a mouth of the bottle, and a head part for remaining outside the mouth, the head part having a diameter that is larger than that of the stopper part;
• wherein the stopper part comprises an interlocking mechanism for engaging with a counterpart interlocking mechanism of the sealing element which is separate from the bottle;
• wherein the sealing element is configured to be forced against an inner wall of the mouth, thereby being brought into a sealed position, upon introducing the stopper part into the mouth, in which sealed position the stopper is held on the bottle by way of a frictional connection;
• and
• wherein the interlocking mechanisms are configured to permit bringing the sealing element into an unsealed position by an unsealing action which comprises rotating the stopper with respect to the bottle;
• the method comprising the following steps:
• assembling the system by introducing the stopper part of the stopper into the sealing element, and
• introducing the system into the mouth of the bottle until the sealed position is reached.