Cap for a container

Abstract

What is described here is a closing cap () for a container (), in particular for a container () intended to contain pressurised beverages. The cap comprising a lateral wall () extending around an axis (Z) and a transversal wall () positioned at one end of the lateral wall (), a separating line () being provided on the lateral wall () to define a retaining ring (), which extends as far as a free edge () and is configured to internally engage with a locking ring () of a neck () of the container (), and a closing element () removably engageable with the neck, so as to open or close the container. The cap comprises an inner thread structure, positioned on the inside of the lateral wall () of the closing element () to engage with an outer thread structure of the neck () and to removably couple the closing element () to the neck () of the container (). The inner thread structure () extends in a spiral around the axis (Z) and comprises at least two vent grooves () which extend axially and interrupt the inner thread structure () thereby defining first segments (), near the transversal wall () and second segments (), over which the first segments () are axially superposed; wherein each of the first segments () extends angularly in a continuous way and at least one segment of the second segments () is interrupted by a vent passage (), to facilitate the discharge of the pressure.