| 摘要 |
<p>Overcap ( 1, 11, 12 ) designed to overcap a neck ( 80 ) of a bottle ( 8 ) closed by a cork ( 82 ) containing a liquid to be packaged ( 83, 84 ) includes a rolled skirt ( 3 ) and a top ( 2 ) fixed to the rolled skirt around a circular junction area ( 4 ) common to the skirt and the top. The top is formed from a first strip of material chosen to have a nature and thickness so that it can be deformed, typically by stamping between a punch and a die or by thermoforming, to form a crease-free rim around the top. The rim is formed by the peripheral part of the top axially deformed over a height H between 1 and 5 mm, and the is a rim ( 20,21 ) that extends around an arc of a circle alpha varying from 45 to 90°. The rolled skirt includes an upper end ( 30 ) necked in over a width of at least 1 mm, cooperating with the rim to form the circular junction area, and is formed from a second strip of material ( 6 ) chosen such that the mechanical properties are not as good as the properties of the first material, the circular junction area ( 4 ) common to the rim ( 20, 21, 22 ) and to the upper end ( 30 ) extending over a width L equal to at least 0.5 mm.</p> |
