Hinged Snap Cap With Frangible Tamper-Evident Band
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Solution Overview
Problem
Existing closures lack a reliable mechanism to provide visual evidence of tampering or opening, which is crucial for ensuring product integrity and consumer safety.
Innovation Solution
A closure design featuring a cap pivotally coupled to a base via a hinge, with a line of weakness and frangible connections that break upon initial opening, providing visible evidence of tampering, and inward projections that secure the closure to the container neck, ensuring it remains closed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closure is designed to remain securely closed, then product integrity is maintained, but there is no visual indication of tampering or opening
Solution Approach 1:
The frangible connections are pre-positioned within the closure structure at specific locations where breaking provides visual tamper evidence. These connections are designed to break at a predetermined moment during unauthorized opening, before the contents are accessed, thereby providing timely warning of tampering while maintaining secure closure during normal use.
Solution Approach 2:
The frangible connections are designed with visual characteristics (such as color, transparency, or contrast) that change or become apparent when broken. This visual change provides immediate and clear indication of tampering, allowing consumers to detect unauthorized opening without requiring complex mechanisms or additional components.
2Loss of information
If frangible connections are added to provide tamper evidence, then visual indication of opening is improved, but device complexity increases
Solution Approach 1:
The frangible connections are integrated into the existing closure structure by combining them with the hinge mechanism and line of weakness. Rather than adding separate, independent components, the tamper evidence feature is merged with the opening mechanism itself, so that the same structural elements that enable controlled opening also provide visual indication of tampering.
Solution Approach 2:
The closure structure is segmented into functional zones: the hinge mechanism for controlled opening, the line of weakness for predetermined breaking point, and the frangible connections for visual indication. This segmentation allows each component to perform its specific function efficiently while maintaining overall structural coherence and avoiding unnecessary complexity.
3Reliability
If the cap is securely attached to the base, then closure reliability is improved, but the cap cannot be easily opened
Solution Approach 1:
The closure transitions from a static, permanently attached state to a dynamic system with controlled movement. The hinge enables the cap to pivot between closed and open positions, while the line of weakness and frangible connections provide controlled failure points. This dynamic design allows easy opening through deliberate action while maintaining secure attachment during normal use.
Solution Approach 2:
The line of weakness is pre-positioned within the closure structure to provide a predetermined breaking point. When force is applied during opening, the frangible connections break at this pre-determined location rather than requiring forceful manipulation of the entire closure. This preliminary structuring of the failure point enables easy opening while maintaining security during normal use.
Data Source
AI summary
A closure with a top panel, a skirt extending downward and away from the top panel, frangible connections that connect the skirt to a tamper band. The frangible connections provide a visual indication, when broken, that the closure has been opened. The closure includes a cap and a base that remain coupled via a hinge after the frangible connections are broken.