| 摘要 |
<p>A vacuum identifying button (26) of a closure (16) for containers (10) has encapsulated microcapsules (30) containing a suitable dye. While the button (26) is in its depressed, concave configuration, a coating (28) surrounding the microcapsules (30) is cured and caused to bond to the microcapsules (30). When the button (26) everts to project upwardly and have a convex configuration, the coating (28) is tensioned causing the microcapsules (30) to rupture and release the color forming dye materials thereof. Evidence of button flipping or tampering can be simply forming a colored area, such as a stripe. However, colored areas may be in a design to present a warning or message. <IMAGE></p> |
