Tamper-Evident Container Fitment Using Thermal Interference Fit
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Solution Overview
Problem
Existing containers for liquid products lack effective mechanisms to prevent refilling with inferior or counterfeit products without compromising the structural integrity of the container or fitment, and fail to provide clear evidence of tampering attempts.
Innovation Solution
A non-removably secured fitment is coupled to the container via an interference fit, incorporating a check valve and decorative/informative features, which prevents refilling by ensuring visible damage upon attempted removal and evidences tampering through breakage, utilizing materials like stainless steel, glass, or ceramic for the fitment and container.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fitment is made non-removably secured to the container, then the container becomes non-refillable and tamper-evident, but the ease of operation for normal use is reduced
Solution Approach 1:
The fitment utilizes thermal expansion parameters to achieve a tight interference fit. When the fitment is inserted into the container neck, the container is heated to expand its neck opening, allowing easy insertion. Upon cooling, the container neck contracts to create a secure non-removable connection, thus resolving the contradiction between ease of insertion and non-refillability.
Solution Approach 2:
The fitment design incorporates a dynamic insertion mechanism where the connection state changes from loose (during insertion with heated container) to tight (after cooling). This dynamic behavior allows the fitment to be easily installed while maintaining permanent security against refilling, addressing both ease of operation and reliability requirements.
2Reliability
If a fitment is made non-removably secured via interference fit, then tamper evidence is provided, but the manufacturing precision requirements increase
Solution Approach 1:
The interference fit design leverages temperature-induced dimensional changes to achieve secure attachment. By heating the container neck during assembly, the precise interference fit is temporarily overcome, allowing assembly without extreme precision. After cooling, the contraction creates the secure tamper-evident connection, reducing the stringency of manufacturing precision requirements.
Solution Approach 2:
The container neck is pre-heated before fitment insertion to facilitate easy assembly. This preliminary thermal action temporarily increases the clearance, allowing the fitment to be inserted without requiring ultra-precise manufacturing tolerances. The subsequent cooling then establishes the secure tamper-evident connection.
3Strength
If the fitment is made from rigid materials like stainless steel or glass, then structural integrity is maintained, but the ability to evidence tampering through breakage is reduced
Solution Approach 1:
The fitment is constructed using composite material structures that combine rigid materials (stainless steel, glass, or ceramic) for structural integrity with vulnerable components that can break to evidence tampering. This composite approach allows the fitment to maintain strength during normal use while providing visual evidence of attempted removal, resolving the contradiction between structural integrity and tamper evidence.
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 renders the container non-refillable and tamper-evident, ensuring that attempts to refill or tamper with the product result in visible damage, thereby protecting the integrity of the product and providing evidence of any unauthorized attempts.
Implementation Method 1
a fitment coupled to the neck of the container via an interference fit
Implementation Method 2
The fitment may be non-removably secured to the container, for example, via an interference fit
Data Source
AI summary
A product includes a container including a neck, and a fitment having a portion coupled to the neck of the container via an interference fit.