Bistable Snap Closure with Tamper-Evident Sealing
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Solution Overview
Problem
There is a need for reclosable containers that are gas- and liquid-tight with a tamper-evident closure system that is easy to operate and cost-effective, suitable for various types of containers, and provides a clear indication when the container has been opened.
Innovation Solution
A cover with a snap-fit mechanism that is deformable in a bistable manner, featuring a tamper-evident sealing element that prevents deformation between states, ensuring the cover can only snap back and forth after the sealing element is removed, and a handle member that must be brought into a functional position to break the seal, indicating the container is no longer in its original state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional tamper-evident closure with an outer groove and removable ring-segment is used, then the container provides tamper-evident sealing, but the opening mechanism is complex and the cover cannot be easily reclosed
Solution Approach 1:
The cover employs a bistable dynamic mechanism that allows it to snap between two stable states (closed and open positions). This dynamic design enables easy opening and reclosing operations while maintaining tamper-evident functionality through the deformable front wall that expands and contracts with each snap action
Solution Approach 2:
The front wall is segmented into a deformable portion and a rigid peripheral edge. The deformable front wall allows snap-fit motion and expansion, while the rigid peripheral edge maintains structural integrity and provides the clamping interface with the container opening
2Ease of operation
If a snap-fit mechanism with deformable front wall is used for easy opening and reclosing, then the cover becomes user-friendly, but tamper-evident sealing becomes difficult to implement
Solution Approach 1:
A tamper-evident sealing element is pre-installed on the cover to block the deformation of the front wall before first use. This preliminary blocking action prevents the snap-fit mechanism from operating, and its removal or destruction during first opening provides clear tamper evidence while allowing subsequent reclosing operations
3Reliability
If the cover is designed to be gas- and liquid-tight with a clamping mechanism, then sealing performance is improved, but the structure becomes more complex and costly
Solution Approach 1:
The cover is constructed as a monolithic piece formed from a single sheet material, eliminating the need for separate clamping components, gaskets, or fasteners. The homogeneous structure achieves gas- and liquid-tight sealing through the continuous peripheral edge that clamps uniformly around the container opening
4Reliability
If a tamper-evident sealing element is added to block front wall deformation, then tamper evidence is achieved, but the material usage and production cost increase
Solution Approach 1:
The tamper-evident sealing element is designed as a sacrificial component that is removed, destroyed, or deformed during the first opening operation. This discarded element provides clear tamper evidence, while the remaining cover structure is recovered and can be reclosed multiple times without additional material cost
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 provides a reliable, cost-efficient, and user-friendly tamper-evident closure system that ensures the container's integrity is maintained until the seal is broken, allowing for easy identification of the first opening and secure reclosure.
Implementation Method 1
the front wall is deformable in a bistable manner between a first state cambered in the direction of attachment and a second state cambered against the direction of attachment
Implementation Method 2
This deformation is accompanied by an enlargement of the cover's outer edge, which is suitable for fastening the cover in a clamping fashion to the container
Data Source
AI summary
A cover operates with a bistable snap-fit mechanism for positioning on a closable opening of a container or on another element to be closed by the cover. The cover and/or a container wall region has fitted thereon a tamper-evident sealing element to be removed when opening the container for the first time, which, prior to being removed, blocks deformation of the front wall necessary for changeover between the two bistable states and/or prevents an expansion portion necessary for the snap-fit mechanism, from bringing about alteration to the outer circumference of the cover necessary for deformation of the front wall of the cover between the two bistable states. As an alternative, or in addition, it is also possible for a handle member, necessary for pulling off the cover, to be configured such that it can only be used once the tamper-evident sealing has been successfully removed.