Sheet Scanner MD Position Profiling for Defect Traceability
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Solution Overview
Problem
Current sheetmaking processes face challenges in accurately tracing on-line measurements of sheet materials back to specific locations on the finished electrochemical cell or battery electrodes due to the zig-zag measurement pattern produced by scanning sensors, which limits production traceability and defect identification.
Innovation Solution
The implementation of a machine direction (MD) position profile measurement system that records the MD position of each cross-direction measurement, using time-stamped MD speed signals and synchronized scanning sensors to generate accurate MD position profiles, enabling precise correlation of measurements with the physical location on the sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If scanning sensors are used to measure sheet properties during production, then measurement capability is provided, but the zig-zag measurement pattern prevents accurate tracing of measurements to specific locations on finished products
Solution Approach 1:
The patent introduces a machine direction position dimension to the measurement data. Each measurement is tagged with its MD position along the sheet, transforming the data from simple property values into spatially-resolved measurements. This dimensional enhancement allows reconstruction of the zig-zag scan paths and accurate mapping of measurements to specific locations on finished products, resolving the traceability problem while preserving measurement capability.
Solution Approach 2:
The system performs preliminary tagging of measurements with their machine direction positions during the scanning process itself. By recording the MD position information at the time of each measurement, the system prepares the data in advance for later traceability reconstruction, eliminating the need for post-processing location identification and enabling direct mapping to finished product locations.
2Ease of manufacture
If conventional scanning systems update profiles periodically at the end of each scan, then cross-directional profiles are provided, but no correlation is made between upstream and downstream scanner measurements
Solution Approach 1:
The patent uses machine direction position as an intermediary parameter to correlate measurements from multiple scanners. By tagging each measurement with its MD position and using this position information to synchronize data from upstream and downstream scanners, the system reconstructs the temporal and spatial relationships between measurements, enabling traceability across the entire production line while maintaining simple periodic profile generation.
3Area of stationary object
If scanning sensors traverse back and forth across the sheet at constant speed, then measurement coverage is achieved, but the finite sheet velocity causes diagonal traversal rather than perpendicular scanning
Solution Approach 1:
The system uses machine direction position feedback to correct for the diagonal scanning effect. By continuously tracking the MD position of the sheet and comparing it with the intended perpendicular scan path, the system can compensate for the diagonal deviation in post-processing, reconstructing the true perpendicular measurement locations while maintaining the simplicity of constant-speed scanning.
Data Source
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AI summary
A machine direction (MD) position profile measurement of a moving sheet records the MD position of each of the cross direction (CD) measurements. A sheet monitoring system includes means for measuring the MD speed of the sheet of material; means for associating measured MD speed with time to generate time-associated MD speeds; means for recording the time-associated MD speeds; a first scanning sensor for measuring a first characteristic of the sheet material wherein the first scanning sensor is located at a first position along the MD and the first scanner sensor traverses back and forth along a CD; and means for associating first characteristic measurements with time to generate time-associated first characteristic measurements. Single and multiple scanning sensors can be employed. For multiple scanner systems where the scanners are synchronized, the technique enables recreation of the real zig-zag measurement path and same spot measurements.