Transfer star-wheel and method

A capping plant for capping containers made of thermoplastic material, the capping plant comprising:

• a capping unit comprising at least four capping stations for applying concave closures on the containers;
• and
• a transfer star-wheel for conveying the containers made of thermoplastic material, the containers being provided with the concave closures that are applied on the containers,
• said transfer star-wheel comprising a rotary carousel having a plurality of supporting stations for supporting the containers,
• each supporting station comprising a pocket at an external circumference of the rotary carousel for receiving and supporting a neck of one of the containers,
• each supporting station comprising a striking element located above the corresponding pocket,
• each striking element being configurable in an operative position in which it is in contact with a concave closure of a container supported in the corresponding pocket, and in a neutral position in which it is spaced from said concave closure,
• wherein said transfer star-wheel is located downstream of said capping unit for receiving the containers that have been capped with the concave closures.