Flip-Top Cap Tamper-Evident Frangible Strap Design
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Solution Overview
Problem
Existing container closures lack a reliable tamper-evident mechanism to indicate if the cap has been previously opened, which is crucial for ensuring product integrity and consumer safety.
Innovation Solution
A container closure with S-shaped frangible straps that break upon initial opening, providing a visible tamper-evident signal by stretching and breaking, with one portion remaining tethered to the ring-shaped body and another to the flip-top cap, indicating that the cap has been moved from the closed to the opened position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a flip-top cap closure is used to allow selective release of substance, then ease of operation is improved, but reliability is worsened due to lack of tamper-evident mechanism
Solution Approach 1:
The closure system is divided into separate functional components: the flip-top cap for dispensing operation, the frangible strap for tamper evidence, and the body for structural support. This segmentation allows each component to perform its specific function independently while working together as a unified system.
Solution Approach 2:
The frangible strap is pre-configured in a stretched state during manufacturing, creating built-in tension that will cause it to break upon first opening. This preliminary preparation ensures that the tamper-evident function is automatically activated when the cap is opened for the first time, without requiring additional user action.
2Reliability
If a frangible strap is added to provide tamper-evident signal, then reliability is improved, but device complexity is worsened
Solution Approach 1:
The frangible strap is integrated into the existing closure structure by connecting it between the body and the flip-top cap. This merging approach incorporates the tamper-evident function into the already-present components, avoiding the need for separate additional mechanisms and minimizing overall system complexity.
Solution Approach 2:
The frangible strap serves multiple functions: it provides structural connection between the cap and body during normal use, and simultaneously acts as a tamper-evident indicator when broken. This multi-functionality reduces the need for separate components and simplifies the overall device design.
3Measurement precision
If the frangible strap is made extensible to stretch during opening, then measurement precision is improved for detecting opening, but strength is worsened due to elastic limit
Solution Approach 1:
The strap material properties are specifically selected to exhibit elastic behavior within a controlled range, allowing it to stretch and straighten during the opening process. The elastic limit is carefully engineered to be exceeded at the precise moment of first opening, ensuring reliable detection while maintaining adequate strength during normal closed-state operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively provides a clear visual indication that the cap has been opened at least once, enhancing product security and consumer trust by ensuring that any subsequent closure does not obscure the fact of previous opening.
Implementation Method 1
the frangible strap is made out of an extensible material and is designed to break during first-time movement of the flip-top cap by a user from the closed position to the opened position. This strap is stretched during initial stages of movement of the flip-top cap relative to the ring-shaped body away from the closed position and toward an opened position. Once the strap is stretched beyond its elastic limit, it breaks
Data Source
AI summary
A closure includes a body adapted to mount on a container having a discharge outlet and a cap configured to move relative to the body from a closed position covering the discharge outlet to an opened position uncovering the discharge outlet. The closure also includes frangible links coupled to the body and cap that break in response to first-time movement of the cap from the closed position to the opened position to alert an observer that the cap has been opened once before.