| 摘要 |
Metal housing provided with a sidewall and a neck connected to the sidewall via a shoulder, the neck being constructed and arranged for irreversible fixation to a dispensing head for perfect leaktightness to liquids. The dispensing head includes a plastic flange provided with a sealing skirt and an outer catching skirt provided with a snap-fit rim on its inner surface, wherein the neck has a wall and the shoulder has a wall, both said walls being of substantially the same thickness as the sidewall. The metal housing includes: an open end in the form of an orifice surrounded by a curl oriented outwards, the neck having a minimum inside diameter being equal to or slightly less than an outside diameter of the said sealing skirt; a first substantially cylindrical part; a substantially tapered shoulder connecting the open end on which the curl is formed to the first substantially cylindrical part; and a second substantially cylindrical part, having an outside diameter less than an outside diameter of the first substantially cylindrical part; the first substantially cylindrical part and the second substantially cylindrical part being separated from each other by a shoulder that is located at a distance from the open end such that when the said flange has been fully force-fitted onto the neck, the snap-fit rim is urged to be folded down on a diameter smaller than the diameter of the first substantially cylindrical part.
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