Conductive Roller Monitoring of Web Resistance in Roll-to-Roll Lines
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Solution Overview
Problem
Existing roll-to-roll manufacturing processes lack effective methods for in-line monitoring of electronic properties of webs, such as electrode materials for electrochemical cells, which are crucial for ensuring quality control and enhancing battery cell performance.
Innovation Solution
A system and method utilizing rollers with electrically conductive contact strips and a measurement system to apply voltage through the web, measuring local resistance values, and determining properties based on voltage differences across aligned contact strips.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional roll-to-roll manufacturing processes are used without in-line monitoring, then the manufacturing process is simpler and less expensive, but quality control and detection of web properties are insufficient
Solution Approach 1:
The measurement system is integrated directly into the roll-to-roll manufacturing line by incorporating contact strips into the existing rollers. This merging of measurement functionality into the manufacturing equipment enables in-line monitoring without requiring separate complex inspection systems, thus improving measurement precision while minimizing additional device complexity
Solution Approach 2:
The rollers in the manufacturing line are designed to serve dual purposes: both their traditional mechanical function of transporting and processing the web, and the additional function of electrical measurement through integrated contact strips. This multi-functionality allows the same equipment to perform both manufacturing and quality control tasks
2Reliability
If in-line monitoring systems are implemented to detect web properties, then quality control improves, but the manufacturing process becomes more complex and time-consuming
Solution Approach 1:
The measurement process occurs continuously as the web passes through the rollers during normal manufacturing operations. The contact strips maintain constant electrical contact with the moving web, enabling uninterrupted real-time measurement of web properties without stopping or slowing down the production line, thus maintaining productivity while improving quality control
Solution Approach 2:
Traditional offline quality control methods involving manual sampling and separate inspection equipment are replaced with an automated electrical measurement system. The contact strips use electrical conductivity measurements to assess web properties, substituting mechanical inspection methods with a more efficient electrical sensing approach that operates seamlessly during manufacturing
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 quality control by detecting defects, monitoring coating uniformity, and ensuring precise alignment of coatings on both sides of the web, thereby improving the manufacturing process efficiency and product quality.
Implementation Method 1
apply a voltage to the first contact strip of the first roller while the web travels thereby such that the voltage conducts through the web to the second contact strip of the second roller
Data Source
AI summary
Systems and methods are provided for monitoring properties of a web during a roll-to-roll manufacturing process. The methods may include moving the web past a first roller such that the web contacts the first roller, wherein the first roller includes a first contact strip formed of an electrically conductive material and extends circumferentially about the first roller, applying a voltage to the first contact strip while moving the web past the first roller, such that the voltage conducts through the web to a second contact strip, measuring the voltage received by the second contact strip, determining local resistance values relative to positions of the web based on the difference in the voltage applied to the first contact strip and the voltage received by the second contact strip, and determining at least one property of the web relative to the positions of the web based on the local resistance values.