| 摘要 |
<p>Device which changes colour according to the pressure to which it is subjected. A tablet, which remains visible from the exterior through the transparent inner cover (6), is impregnated with a product for indicating the presence of pressure. The capsule (3) provides a sealed closure when screwed onto the neck of a bottle containing for example, an effervescent drink. Application: if the pressure inside the bottle exceeds the normal value, a change in the colour of the tablet (8) becomes apparent through the window (5).</p> |
