Two-Piece Cap Anti-Rotation and Tamper Evidence Design

Anti-rotation formations such as fins, ribs, or protrusions are added to the cap cover and corresponding engagement features on the cap or container neck. These asymmetric features prevent rotational movement that would compromise the seal, while maintaining a relatively simple overall structure. The anti-rotation features are localized additions rather than fundamental structural changes.

The closure system is segmented into a cap and a cap cover, each manufactured separately using standard molding processes. The cap threads onto the container neck, while the cap cover snaps over the cap with audible and tactile feedback. This segmentation provides design flexibility for customization and tamper evidence features, while each component can be manufactured independently using conventional techniques, managing manufacturing complexity through modular production.

The frangible members are designed as disposable, sacrificial elements that are intended to break upon tamper attempt. These members can be simple plastic tabs, ribs, or welded joints that provide sufficient attachment strength during normal use but fail predictably when force is applied. By accepting that these elements are temporary and sacrificial, the manufacturing precision requirements are reduced, as the focus is on achieving adequate strength rather than precise, permanent attachment.