| 摘要 |
An irreversible tamper evident system is provided by a color change system (32) carried by the flexible button portion (24) of the closure (10). A color change system (32) comprises an indicator coating (36) over a dark colored substrate coating (34). The indicator coat (36) is suitably colored with a light colored transparent colorant such as an orange colored fluorescent dry. The indicator coat (36) is also preferably a liquid material which can be cured by evaporation, heat, UV irradiation or the like, to form a solid layer. When the substrate layer (34) and indicator layer (36) are in intimate contact, a first color is observed. Depending upon the relative colors used for this substrate and indicator layers (34, 36) this first color can be a combination of the colors of the two layers (34, 36) or can be primarily the color of the substrate layer (34). However, when the layers (34, 36) become separated and the indicator or outer layer (36) is spaced from the substrate inner layer (34) a second color is observed. The second color is primarily the color of the indicator coat (36). <IMAGE> <IMAGE> |
