Non-Conductive Wall Defect Detection via Localized Electric Discharge
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Solution Overview
Problem
Existing systems for checking defects in non-electrically conductive materials, such as plastics, are not reliable or accurate, especially in ensuring hermetic seals, and are sensitive to environmental conditions like temperature and humidity.
Innovation Solution
A checking system using two electrodes arranged on opposite sides of the wall to be checked, with a potential difference applied to detect electric discharges, reducing disturbances and air leakages, and capable of operating effectively with small electric potentials, even in the presence of undercuts or non-uniform thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high voltage is applied to detect defects in non-conductive walls, then defect detection capability is improved, but electrical air leakages and disturbances increase
Solution Approach 1:
The patent applies local quality by concentrating the electric field precisely at the defect location through the electrode arrangement. The electric field is localized to the wall region being inspected, allowing high voltage application without causing widespread electrical air leakages. The field intensity is high only where needed (at potential defects) and low elsewhere, resolving the contradiction between detection capability and harmful electrical discharges.
Solution Approach 2:
The non-conductive wall itself acts as an intermediary medium between the electrodes. The wall material controls the electric field distribution, allowing the system to use high voltage for detection while the wall's insulating properties prevent uncontrolled electrical air leakages. The intermediary structure enables the detection function while limiting harmful effects.
2Reliability
If environmental conditions (temperature and humidity) are considered, then system reliability is improved, but system complexity increases
Solution Approach 1:
The system achieves self-service by using the wall's own physical properties (thickness, material composition) as the detection mechanism. The wall itself responds to the applied electric field in a way that reveals defects, eliminating the need for additional sensors or complex environmental compensation systems. This maintains high reliability while avoiding increased system complexity.
3Measurement precision
If large electric potential is applied, then defect detection sensitivity is improved, but energy consumption increases
Solution Approach 1:
The electric potential is applied locally and concentrated at the inspection point rather than being distributed throughout the entire system. This allows high detection sensitivity at the wall being inspected while minimizing overall energy consumption. The localized field application ensures energy is used only where needed for detection.
4Productivity
If checking speed is increased, then productivity is improved, but measurement precision may deteriorate
Solution Approach 1:
The system uses periodic application of electric potential or periodic movement of the electrode/ wall through the detection zone. This periodic action allows for rapid successive measurements while maintaining precision through consistent, repeatable detection cycles. The rhythmic nature of the periodic action enables high productivity without sacrificing measurement quality.
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 provides high reliability and accuracy in detecting defects, operates independently of environmental conditions, and can check multiple objects quickly, ensuring the integrity of hermetic seals by identifying thickness reductions or lack thereof.
Implementation Method 1
A potential difference between the tools is then generated by applying a potential to the internal tool 102 and grounding the external tool 103. The system is configured in such a manner that, if the zone to be checked is not whole, an electric discharge is generated between the tools.
Data Source
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AI summary
A checking system is disclosed for checking for the absence of defects in a facilitated opening line formed by a non- through circumferal notch in an annular wall of a containers closure made of plastics. A spindle enters the annular wall and rotates the annular wall in such a manner that the entire circumference of the facilitated opening line faces an external electrode to which an electric potential is applied. If the thickness of the facilitated opening line falls below a limit value, an electric discharge is generated between the electrode and the spindle, for which reason the containers closure is discarded.