Patent ID: 7124905

Claim:
Closing cap for a bottle with a threaded neck, comprising an outer cap provided with a top portion and a skirt portion having an internal wall, and an insert made of a plastic material having a threaded skirt fixed to the internal wall of the skirt of said outer cap, the skirt of said outer cap extending beyond the skirt of said insert, said threaded skirt comprising an inner thread for fixing the cap to the threaded neck of the bottle, the inner thread having a top portion and a bottom portion, the bottom portion of the thread having a thickness between 0.40 mm and 0.150 mm, the top portion has a thickness such that a ratio between the thickness of the thread at its top portion and its bottom portion is between 2 and 10, wherein the plastic material has mechanical properties equal at least to the mechanical properties of polyethylene at 25°C.