Capacitive Sachet Integrity Sensor for Online Seal Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for seal integrity testing of sachets are inefficient, as they often require offline analysis, are not viable in production lines, have low throughput, and are prone to false positives due to sensitivity issues with tiny particles, leading to contamination and financial losses.
Innovation Solution
A capacitive seal and package integrity sensor system that uses a pair of copper electrodes to apply an AC bias voltage and measure electrical properties over a frequency range, allowing for real-time detection of defective seals and inner protective layer issues by analyzing capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pressure-based systems or vacuum/pressure decay methods are used for seal integrity testing, then measurement precision is improved, but productivity deteriorates due to offline analysis and low throughput
Solution Approach 1:
The patent replaces mechanical pressure-based testing systems with an electrical field-based capacitive sensing system. By applying AC bias voltage to electrodes and measuring electrical properties (capacitance, impedance) over a frequency range, the system achieves rapid online detection of seal integrity and trapped particles without requiring pressure chambers or vacuum equipment, thereby maintaining measurement precision while dramatically improving productivity
Solution Approach 2:
The system performs preliminary electrical characterization of sachets by measuring electrical properties across a frequency range before final defect classification. This preliminary action enables the system to establish baseline capacitance values and identify deviations that indicate seal defects or trapped particles, allowing for rapid online inspection without compromising throughput
2Measurement precision
If existing seal integrity inspection systems use destructive approaches with heavy equipment, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical testing equipment with simple electrical field-based capacitive sensors. The system uses electrodes connected to a signal generator and measurement device to detect seal integrity through electrical property changes, eliminating the need for heavy pressure chambers, vacuum equipment, and complex mechanical assemblies while maintaining high detection accuracy for seal defects and trapped particles
Solution Approach 2:
The system uses simple, inexpensive electrodes and electrical measurement components instead of expensive, complex testing equipment. The capacitive sensing approach requires minimal hardware that can be easily manufactured and deployed, reducing both device complexity and cost while achieving reliable online inspection capability
3Measurement precision
If vacuum/pressure decay methods are used, then measurement precision is improved, but loss of time increases due to high processing time
Solution Approach 1:
The patent replaces time-consuming pressure decay methods with instantaneous electrical field-based capacitive measurement. By measuring capacitance and impedance changes across a frequency range, the system detects trapped particles and seal defects in real-time without requiring pressure application or decay observation periods, thereby maintaining high detection sensitivity while reducing processing time to enable online inspection
Solution Approach 2:
The system applies periodic AC bias voltage at multiple frequencies to the electrodes and measures the resulting electrical properties. This periodic action across a frequency range enables rapid characterization of the sachet's electrical response, allowing the system to identify defects through frequency-dependent capacitance and impedance variations without requiring prolonged measurement times
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
Enables rapid, real-time identification of defective sachets with high sensitivity to small particles and worn-out layers, reducing contamination and waste while maintaining production line throughput without the need for expensive equipment.
Implementation Method 1
measuring an electrical property of the portion of the sachet over a frequency range, and determining the integrity based on the measured electrical property
Implementation Method 2
applying an AC bias voltage to the electrode structure; measuring an electrical property of the portion of the sachet over a frequency range
Data Source
AI summary
A method and system for integrity testing of sachets. The method comprises the steps of disposing at least a portion of the sachet relative to an electrode structure; applying an AC bias voltage to the electrode structure; measuring an electrical property of the portion of the sachet over a frequency range, and determining the integrity based on the measured electrical property over the frequency range.