Abstract: A cap adapted to be secured on a neck of a container wherein the cap includes a top wall and a depending annular skirt having an inner annular projection. A fluid seal having a central transverse wall, an outer annular shoulder and a inner annular bead rests on the inner annular projection so as to define a space between the cap and the fluid seal into which the fluid seal is pushed when the cap is secured to the neck of the container to make a seal between the outer annular shoulder of the seal and the inner annular projection.

Abstract: A process for manufacturing a closing device constituted by a tapped closing device and a tamper-proof ring inlcuding, on the one hand, an annular joining strip with controlled deformation and, on the other hand, an inner annular projection. A preforming of the tamper-proof ring is effected:by axially introducing in said device a cylindrical mandrel which is provided with an annular peripheral cam such that the lower face of the inner annular projection comes into abutment against said cam, thenby exerting on said device and/or on the mandrel a bearing effort whose force is sufficient to ensure a relative stroke of the mandrel in the device in contact with the cam up to a preforming position maintained for a determined time so as jointly to produce an outward bending of the strip with controlled deformation and a remanent deflection towards the closing device of the inner annular projection so that its upper face remains inclined by an angle with respect to the normal to the axis of the device.

Abstract: A closure device for a recipient with a threaded neck. It includes a tapped closure having a lower part attached to a guarantee strip by a zone of connection of low mechanical resistance, the strip presenting an elastically-deformable, inner, annular bead adapted to clip beneath a holding flange formed on a lower periphery of the neck by forced screwing of the closure; and an outer peripheral boss axially separated from the bead by a zone of controlled elastic deformation, an upper face of the boss and a lower edge of a lateral wall of the closure having formed therein, respectively, at least one tooth and at least one notch, the tooth being intended to be temporarily received in the notch during screwing when the bead is in abutment with the holding flange in order to avoid any relative rotational displacement of the closure with respect to the strip and to ensure clipping without deteriorating the zone of connection.