Coating Thickness Correction for Roll-Induced Substrate Shaking
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Solution Overview
Problem
Conventional coating thickness measurement techniques for secondary batteries face inaccuracies due to substrate shaking caused by coating rolls and neglect of temperature effects, leading to compromised measurement accuracy.
Innovation Solution
A coating thickness measuring apparatus and method that includes a data obtaining unit to collect thickness data from a contact portion of the substrate and a processor to correct the data using pre-stored correction data, accounting for temperature and roundness variations, thereby generating accurate and reliable measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the substrate is transported through rolls spaced apart from each other, then the substrate can be conveyed through the coating process, but the vibration generated from the rolls causes the substrate to shake and deteriorates the accuracy of coating thickness measurement
Solution Approach 1:
A support roll is introduced as an intermediary element between the transport rolls to provide continuous support to the substrate during transport. This mediator prevents substrate shaking caused by the gap between spaced rolls, thereby maintaining measurement accuracy while preserving transport efficiency
Solution Approach 2:
The patent replaces mechanical vibration isolation methods with a measurement correction system that uses sensors to detect substrate position deviations and computationally corrects thickness measurements. This substitution allows continuous transport without mechanical intervention while maintaining measurement precision
2Device complexity
If conventional measurement methods are used without considering temperature effects, then the measurement process is simple, but the accuracy of coating thickness measurement value is deteriorated
Solution Approach 1:
Temperature sensors continuously monitor the substrate temperature during coating, and the measurement system receives feedback about temperature variations. This feedback is used to compensate for thermal expansion effects on both the substrate and coating, improving measurement accuracy without significantly increasing system complexity
Solution Approach 2:
The patent introduces temperature as an additional measurement parameter that is monitored and used to adjust the thickness measurement calculations. By changing from a single-parameter (thickness only) to multi-parameter (thickness + temperature) measurement system, the accuracy is improved while maintaining reasonable system complexity
Data Source
AI summary
Disclosed is a coating thickness measuring apparatus and method.The coating thickness measuring apparatus according to an embodiment of the present disclosure includes a data obtaining unit configured to obtain thickness data indicating a thickness of a coating material applied to a contact portion of a substrate in contact with a coating roll while the substrate coated with the coating material is transported by the coating roll; and a processor configured to create a virtual memory zone having a plurality of storage areas in which correction data is distributed and stored and correct the thickness data based on the correction data pre-stored in a target storage area selected from the plurality of storage areas to generate corrected thickness data.