Tamper Evident Container With Frangible Score Lines
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Solution Overview
Problem
Existing packaging containers lack a reliable mechanism to indicate tampering, which can compromise the quality and value of the goods they contain.
Innovation Solution
A tamper-evident container design featuring interlocking flanges with frangible score lines and extensions, where the interlocking elements require more force to separate than to sever, providing a clear indication of opening or attempted opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional container sealing methods are used, then the container can be opened easily, but there is no reliable indication of tampering
Solution Approach 1:
The container sealing mechanism is divided into separate functional segments: frangible score lines for controlled breaking, interlocking flanges for secure closure, and tabs for opening. This segmentation allows the tamper indication function to be separated from the opening function, enabling reliable tamper detection while maintaining ease of legitimate opening.
Solution Approach 2:
The frangible score lines are pre-formed during manufacturing, creating predetermined weak points that will break under specific force conditions. This preliminary action ensures that when the container is legitimately opened, the score lines break in a controlled manner to provide tamper indication, while requiring excessive force to separate the interlocking elements would already have triggered the indication.
2Reliability
If strong interlocking elements are used to secure the container, then tamper resistance improves, but the container becomes difficult to open legally
Solution Approach 1:
Different parts of the sealing mechanism have different mechanical properties tailored to their specific functions: the frangible score lines are designed with low break strength for easy legitimate opening and clear tamper indication, while the interlocking flange elements are designed with high separation resistance for tamper protection. This local differentiation of mechanical properties resolves the contradiction between security and ease of operation.
Solution Approach 2:
The design utilizes parameter changes in the material properties and geometric dimensions of different components. The frangible score lines have optimized thickness and length parameters for controlled breaking, while the interlocking elements have optimized engagement depth and surface area parameters for high separation force requirement. These parameter variations enable the dual functionality of easy legitimate opening and difficult tampering.
3Reliability
If frangible score lines are added for tamper indication, then tamper detection improves, but the manufacturing complexity increases
Solution Approach 1:
The frangible score lines are integrated into the existing container structure during the molding process, combining the sealing function and tamper indication function into a single manufacturing step. This merging approach adds minimal manufacturing complexity while providing reliable tamper detection, as the score lines are formed as part of the container's structural features rather than as separate components.
Data Source
AI summary
A tamper evident container includes a cover with a first interlocking flange with a first tab for opening the container and a first extension joined to the first tab along a first frangible score line, a base with a second interlocking flange with a second tab for opening the container and a second extension joined to the second tab along a second frangible score line, a rim extending around a perimeter of the base, the rim having a flat portion connected to an outer wall, and a flange portion extending from the outer wall portion, wherein a position of the flat portion and the flange portion correspond to a sheet line, and wherein the first and second interlocking flanges, when securely fastened together, prevent access to the first and second tabs, and require more force to separate than to sever the first and second extensions along the frangible score lines.