| 摘要 |
<p>The non-refillable stopper has special tubular closing element (17) surrounding upper region of bottle neck (3). The closing element has upper and lower projecting flanges (16,18) pressed inwards by external laminar covering (11). The external laminar covering displaces vertically during stopper opening operation such that the flanges are viewed to be in compressed disposition. The flanges protrudes outward during release by laminar covering.</p> |
