Thermal Imaging for Real-Time Package Seal Integrity
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Solution Overview
Problem
Existing packaging integrity testing methods are inefficient and incapable of detecting defects in sealing regions, particularly for heat-sealed products with liquid or paste contents, leading to potential contamination and quality issues.
Innovation Solution
Utilizing thermal imaging during the filling phase to detect defects in the sealing region by exploiting differences in emissivity and thermal signatures between the sealing material and the filling content, optionally combined with visual imaging and image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional leak testing methods (vacuum or pressure decay testing) are used, then package integrity can be tested, but the testing process is too slow for fast-paced packaging lines
Solution Approach 1:
The patent replaces mechanical leak testing methods (vacuum/pressure decay) with optical imaging technology. Thermal imaging cameras detect temperature differences and emissivity variations to identify sealing defects, eliminating the need for slow mechanical testing processes while maintaining detection reliability.
Solution Approach 2:
The imaging system performs sealing defect detection during the filling phase, before the sealing process is complete. This preliminary detection allows for real-time identification of potential defects without waiting for the entire packaging process to finish, significantly reducing testing time.
2Measurement precision
If sporadic physical examination is used to verify package integrity, then some defects can be detected, but the method lacks continuous monitoring capability
Solution Approach 1:
The patent implements continuous automated imaging monitoring throughout the packaging process. Multiple cameras capture thermal and visual data at different stages (filling, sealing, post-sealing), providing uninterrupted detection capability rather than sporadic sampling.
Solution Approach 2:
The system uses the natural thermal emissions and visual characteristics of the packaging materials and products themselves for detection. The imaging cameras capture inherent thermal signatures and visual defects without requiring external test substances or complex test setups.
3Reliability
If imaging is performed after sealing completion, then sealing defects can be detected, but defects caused by filling contamination cannot be identified
Solution Approach 1:
The system performs imaging during the filling phase before sealing occurs. This preliminary imaging captures thermal and visual characteristics of the filling process, allowing detection of contamination defects that would otherwise be hidden after sealing completes.
Solution Approach 2:
The patent uses thermal imaging to detect defects in a different dimension (thermal signature) rather than relying solely on visual inspection. This thermal dimension allows detection of filling-related defects that may not be visually apparent but create detectable thermal patterns.
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 real-time detection of sealing defects, preventing the production of low-quality packages and reducing the risk of contamination, while improving the reliability and efficiency of packaging lines.
Implementation Method 1
imaging the sealing region of the container during and/or after the filling of the container with a filling material and prior to the completion of sealing of the container
Implementation Method 2
utilizing thermal imaging for determining package integrity of packed products
Data Source
AI summary
Methods and systems for detecting and monitoring defects in a sealing region of a container, including imaging at least part of the sealing region of the container using a camera operative at a wavelength in the range of about 0.76 μm-14 μm; during and/or after the filling of the container with a filling material and prior to sealing of the container being completed; and identifying, based on at least one frame obtained from the imaging, defects in the sealing region.