Patent ID: 7922018

Claim:
A screw closing cap, designed to cooperate with a neck of a receptacle, said neck forming a mouth lip on an upper part and comprising an outer thread on a sidewall and a recessed part on which said cap will be crimped, said cap comprising: an outer shell, an insert, said insert being contained in said outer shell and being fixed to said outer shell and comprising an inner head forming a bottom of said insert and an inner skirt provided with an inner thread that cooperates with the outer thread of said neck, and a seal forming an add-on part fixed to said insert, said seal comprising a central part and a peripheral edge, wherein said inner skirt comprises a circular tab that is axial spaced from said inner head, so as to form an annular groove with an axial height equal to at least a thickness of said seal, said annular groove being limited at a top part by said circular tab and at a lower part by said thread, a diameter of said seal is such that said peripheral edge cooperates with said annular groove, said seal having annular overlap areas with said tab, so that said seal remains fixed to said insert before said cap is screwed onto said neck, or after said cap is unscrewed from said neck, said circular tab has a flexible radial end and a radial width such that, when said cap is screwed onto said neck, said flexible radial end of the said circular tab and said peripheral edge of said seal simultaneously bend from positions that are substantially parallel to each other, said circular tab applying a radial compression on said peripheral edge, so as to apply said peripheral edge in contact with said neck, forming an overlap area inclined at more than 45° from the horizontal between said peripheral edge and said flexible radial end, thus sealing said cap screwed to said neck.