Flexible Foil Closure for Aseptic Spoilage Detection
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Solution Overview
Problem
Existing container closure systems are not suitable for aseptically filled fluids, as they cannot detect spoilage non-destructively without opening the package, particularly for sensitive products like infant formulas, where visual differentiation between aseptic and spoiled states is challenging.
Innovation Solution
A container closure system featuring a flexible foil sealed to the container opening and a screw cap with a headspace, allowing the foil to deflect under increased pressure due to spoilage, enabling non-destructive detection using proximity sensors, with the foil made of a laminated material including an aluminium layer for enhanced detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional closure system is used for aseptically filled containers, then the container can be sealed, but spoilage detection is not possible without opening the package
Solution Approach 1:
The patent employs a flexible membrane that changes its visual appearance based on pressure changes caused by spoilage. When microorganisms grow and produce gas, the internal pressure increases, causing the membrane to deflect and change its visual aspect, providing a clear visual signal of spoilage without needing to open the container.
Solution Approach 2:
The patent uses a flexible membrane as part of the closure system that can deflect in response to pressure changes. This flexible element serves as both a seal and a spoilage indicator, moving from a flat position when aseptic to a deflected position when spoilage occurs, enabling non-destructive detection while maintaining container integrity.
2Reliability
If a flexible membrane is used to indicate spoilage, then visual detection is possible, but the system is only suitable for carbonated beverages with high internal pressure
Solution Approach 1:
The patent modifies the pressure differential parameters to suit aseptically filled contents. Instead of relying on high carbonation pressure, the system detects the relatively small pressure changes caused by microbial gas production. The membrane's sensitivity is calibrated to detect these subtle pressure changes, making the system adaptable to low-pressure aseptically filled products while maintaining reliable spoilage indication.
Solution Approach 2:
The closure system is pre-configured with the flexible membrane positioned to be flat when the container is properly sealed and aseptic. This preliminary state establishes a baseline from which spoilage-induced deflection can be clearly detected, enabling reliable indication specifically for aseptically filled contents without cross-reacting with normal product conditions.
3Loss of information
If the container is opened to detect spoilage visually, then the content state can be determined, but product sterility is compromised
Solution Approach 1:
The closure system performs the spoilage detection function automatically through the visual appearance of the flexible membrane. The membrane self-indicates the content state through its deflected or flat position, eliminating the need for consumers to open the container to check for spoilage. This self-service mechanism provides full information about content integrity while the container remains sealed and sterile.
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 system effectively differentiates between aseptic and spoiled states without opening the container, ensuring the integrity of aseptically filled products by detecting pressure changes caused by microbial growth, reducing waste and maintaining product sterility.
Implementation Method 1
detecting pressure changes caused by microbial growth
Implementation Method 2
microbial growth
Implementation Method 3
detecting pressure changes caused by microbial growth
Data Source
Figure 1A~1D
Figure 2A~2D
AI summary
The present invention relates to a container equipped with a closure system particularly adapted for aseptically filled fluid contents. The invention also relates to the use of said container in a method for detecting spoilage of its fluid content.