Flexible Container Integrity Testing Using Air Pressure Decay
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Solution Overview
Problem
Conventional helium-based leak detection systems for flexible containers are expensive, cumbersome, and prone to false positives due to helium permeability issues, making them inefficient for testing container integrity, especially in large-scale industrial settings where crinkles can lead to volume reduction and potential container failure during filling.
Innovation Solution
A portable device using air to inflate flexible containers to a predetermined pressure, monitored over time to assess integrity, which also removes crinkles and allows testing at the filling location, reducing handling-related flaws and eliminating the need for helium-based systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If helium-based leak detection systems are used to test container integrity, then leak detection capability is improved, but device complexity and operational cost increase significantly
Solution Approach 1:
The patent extracts the essential function of leak detection from the complex helium-based system and implements it using a simple pressure decay measurement approach. By removing the helium gas source, enclosure, and sophisticated detection equipment, the system achieves leak detection through basic pressure monitoring that is inherently simpler while maintaining effectiveness for flexible container applications.
Solution Approach 2:
The patent replaces expensive, reusable helium testing equipment with inexpensive, disposable pressure sensors and standard air or nitrogen gas. The pressure sensors can be simple, single-use devices that are discarded after one test, eliminating the need for costly helium cylinders, specialized enclosures, and complex detection systems that require maintenance and calibration.
2Reliability
If helium-based testing systems are deployed, then container integrity testing is improved, but loss of time and operational efficiency worsen due to restraint requirements
Solution Approach 1:
The patent enables the container to test itself by connecting the pressure sensor directly to the container's fill port or access valve. The container maintains its own internal pressure during testing without requiring external restraint mechanisms or specialized fixtures. This self-testing capability eliminates the need for technician intervention to secure or position the container during the test process.
3Measurement precision
If helium is used for leak detection, then sensitivity to small leaks is improved, but false positives increase due to helium permeability through container materials
Solution Approach 1:
The patent changes the test parameter from using helium gas to using air or nitrogen gas, which are not permeable through the flexible container materials. This parameter change eliminates the false positive problem associated with helium permeability while maintaining adequate sensitivity for detecting actual leaks in the container system through pressure decay measurement.
4Productivity
If containers are filled to predetermined volume, then production efficiency is improved, but container failure risk increases due to crinkles reducing available volume
Solution Approach 1:
The patent performs a preliminary inflation action before filling to expand any crinkles or collapsed sections of the flexible container. By inflating the container with gas to a predetermined pressure and then venting it, the container walls are smoothed out and returned to their intended shape, maximizing the available volume. This preliminary action prevents volume loss during subsequent filling operations and eliminates the risk of overfilling and container failure.
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
This method effectively evaluates container integrity using ordinary air, reduces crinkle-related failures, and allows for on-site testing, decreasing the risk of introducing new leaks during transport and handling, while avoiding the costs and limitations of helium testing.
Implementation Method 1
inflating the flexible container with a sterile gas to reach a predetermined pressure within the flexible container
Implementation Method 2
monitoring pressure within the flexible container for a predetermined period of time and comparing the pressure of the flexible container after the predetermined period of time to a predetermined set point
Data Source
AI summary
A portable test device and related method are disclosed for conducting integrity testing of flexible containers. The test is particularly useful for testing aseptic flexible film bags in a manner that maintains the sterile nature of the container and removes crinkles by inflating the containers to remove crinkles and establish an inflation set point. The decay in pressure is measured over a predetermined period of time; if pressure loss does not exceed a predetermined threshold the integrity of the bag is confirmed and it can be filled without further manipulation of the container that may result in introducing flaws.