| 主权项 |
1. A tube head assembly comprising
a tube head comprising a neck defining a longitudinal axis (Z-Z), a shoulder and a solid insert forming a lid closing said neck, a cap comprising a punch adapted in order to cut the lid, said cap being adapted to be screwed onto said neck, and configured in such a way that when said cap is screwed onto the neck the punch is inserted into the neck, and a removable spacing ring disposed bearing against the shoulder around the neck, the ring and the cap being formed integrally in one piece and joined by material bridges, said ring having an internal diameter greater than the external diameter of said cap, so as to enable the cap to slide through the ring after breakage of said material bridges, said ring being dimensioned in such a way as to keep the punch spaced apart from the lid when the cap is screwed onto the neck; characterised in that the ring and the cap comprise lugs and recesses co-operating in such a way as to limit their rotation relative to one another in the direction of screwing of the cap on the neck in order to prevent the breakage of said material bridges between the ring and the cap during the screwing of the cap onto the neck. |
