Non-Contact Electrode Testing for Closure Cap Microholes
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Solution Overview
Problem
Existing methods for testing plastic closure caps for microholes or microcracks often result in damage due to friction and require a backup mechanism, which can lead to inefficiencies and increased costs, especially when testing caps with guarantee strips or flaps.
Innovation Solution
A non-contact electrode arrangement with a stationary upper and lower electrode and a discharge path, where the test voltage is controlled to be greater than the breakdown voltage in air but less than through a flawless object, allowing for detection of microholes and cracks without mechanical contact or jamming, using a combination of alternating and DC voltage sources synchronized with object movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical backup mechanism is used to transport test objects during testing, then the test objects can be moved through the testing station, but friction and mechanical contact cause damage to the test objects
Solution Approach 1:
The patent replaces the mechanical backup transport mechanism with a non-contact electrode arrangement. Test objects are transported through the testing station without mechanical contact, using only electrical fields for testing. The electrode arrangement creates an electrical path through the test object without requiring physical backup support, thereby eliminating friction damage while maintaining reliable transport and testing.
2Ease of operation
If a backup mechanism is implemented to support test objects during testing, then test objects can be transported, but the device complexity increases
Solution Approach 1:
The patent extracts and removes the backup mechanism from the testing system. By eliminating the mechanical backup component entirely, the device complexity is reduced while maintaining the ability to transport and test objects. The testing is performed using only the non-contact electrode arrangement, which does not require backup support structures.
3Measurement precision
If test voltage is applied between electrodes to detect microholes, then defects can be identified, but breakdowns may occur through unintended paths causing false rejects
Solution Approach 1:
The patent applies local quality by positioning the electrodes such that the electrical field is concentrated through the bottom surface of the test object where microholes are most likely to occur. The electrode arrangement creates a localized testing path that focuses the electrical field through the critical area, improving defect detection precision while reducing the likelihood of breakdowns through unintended paths, thereby reducing false rejects.
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 approach significantly reduces the risk of damage to closure caps during testing, improves reliability, and minimizes the number of false rejects by ensuring that breakdowns occur only through intended paths, thus enhancing the accuracy and efficiency of the testing process.
Implementation Method 1
a test voltage is controlled to be greater than the breakdown voltage in air but less than through a flawless object, allowing for detection of microholes and cracks
Implementation Method 2
an electrode arrangement is provided which comprises a stationary upper electrode situated above a transport plane and a stationary lower electrode situated beneath the transport plane, as well as a discharge path between the upper and the lower electrode
Data Source
AI summary
A method and a device for testing for the presence of micro-holes or microcracks in a bottom surface of test objects includes an upper electrode arranged above a transport level and a lower electrode arranged below the transport level. The magnitude of a test voltage generated by two voltage sources connected in series is controlled at the electrodes so that the test voltage is greater than or equal to the breakdown voltage between the electrodes in air, and smaller than the breakdown voltage through a test object without holes or cracks. The test voltage is controlled temporally and synchronously with the movement of the test objects, so that the test voltage is only applied when one of the test objects is located between the electrodes. A hole or crack is recognized by a breakdown to the discharge path between the electrodes.