Container Leak Detection via Adaptive Pressure Profile Analysis
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Solution Overview
Problem
Current methods for testing container tightness, particularly in pharmaceutical containers, face challenges such as variability in pressure profiles due to environmental factors and the inability to accurately distinguish between air and liquid leaks, leading to inconsistent results and potential false positives or negatives.
Innovation Solution
A method that involves placing a container in a pressure chamber, creating a pressure difference to detect leaks by analyzing the pressure profile over time, with adaptive reference profiles to account for ambient conditions and the use of differential pressure sensors to identify specific types of leaks, allowing for precise identification and characterization of leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vacuum testing is used to detect leaks, then sensitivity to small leaks is improved, but false positives occur due to pressure changes from environmental factors
Solution Approach 1:
The patent changes the evaluation parameter from absolute pressure values to pressure gradient (rate of pressure change). This transformation eliminates the influence of environmental factors that cause static pressure variations, while preserving sensitivity to actual leaks that produce characteristic pressure gradients over time.
Solution Approach 2:
The patent creates reference profiles from tight containers that replicate the pressure behavior of valid containers under various environmental conditions. By comparing test containers against these copied reference patterns, the system distinguishes between environmental noise and actual leaks.
2Productivity
If conventional pressure testing is used, then test speed is improved, but ability to distinguish between air and liquid leaks deteriorates
Solution Approach 1:
The patent applies dynamic evaluation by analyzing the temporal evolution of pressure profiles rather than static pressure values. Different leak types (air vs. liquid) produce distinct dynamic pressure patterns, enabling identification while maintaining fast testing through automated profile comparison.
Solution Approach 2:
The system uses feedback from pressure sensor measurements to continuously update the pressure profile and compare it against reference profiles. This feedback loop enables real-time distinction between leak types based on how the pressure evolves during the test cycle.
3Reliability
If dynamic reference signal updating is used, then compensation for environmental drift is improved, but device complexity increases
Solution Approach 1:
The system performs self-calibration by automatically generating reference profiles from tight containers during normal operation. This self-service approach eliminates the need for external calibration equipment or complex manual adjustment mechanisms, achieving reliable drift compensation through automated profile creation and storage.
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 enables fast, sensitive, and repeatable container tightness testing with high sensitivity and reproducibility, reducing false rejects and improving test quality by distinguishing between air and liquid leaks and compensating for environmental influences.
Implementation Method 1
a reduction of pressure within the pressure chamber or an increase of pressure within the pressure chamber as far as a predetermined test pressure is effected. Hence, a pressure difference arises between the interior volume of the container and the surroundings of the container
Implementation Method 2
an ascertainment of a pressure profile within the pressure chamber over time
Data Source
AI summary
A method for testing a container (11) having an interior volume (12) for tightness, comprising the following steps: providing the container (11) in a pressure chamber (10) and reducing pressure within the pressure chamber (10) or increasing pressure within the container (11) as far as a predefined test pressure, ascertaining a pressure profile (100) within the pressure chamber (10) over time, comparing the pressure profile (100) to a reference profile (200) in order to determine whether a leak is present within the container (11), wherein ambient conditions of the container (11) and/or the pressure chamber (10) are monitored and the reference profile (200) is adapted to changing ambient conditions.