| 摘要 |
All sealed flaps of a box or carton are provided with viewing window apertures which are in registration with frangible parts of underlying flaps. The underlying flaps have scored areas in the skin portions thereof to which cold glue is applied for sealing the underlying flaps to the flaps having the window apertures. When any of the flaps having the window apertures are pulled open, the skin portions of the underlying flaps are stripped from the main substrate layers of the underlying flaps within the scored areas. This stripping tears the frangible parts of the underlying flaps, such parts being unscored, leaving roughly torn elements of the frangible parts visible through the viewing window apertures. Attempts to reseal the flaps which have been pulled open are ineffective because the viewable torn elements of the frangible parts cause the tampering to be permanently evident.
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