Interframe Profile Alignment Monitoring for Sheet Coating Weight
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current sheet manufacturing processes face challenges in detecting and correcting scanner misalignment, which leads to inaccurate quality control and potential poor sheet quality due to manual and time-consuming methods for aligning scanning profiles.
Innovation Solution
An automatic monitoring system using cross-correlation analysis to track changes in profile misalignment over time, providing alerts when deviations occur, and allowing for real-time correction of scanner alignment to ensure accurate measurement profiles across multiple scanners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual alignment checking is performed by gathering and analyzing data, then alignment accuracy can be assessed, but the process is time-consuming and delays corrective action
Solution Approach 1:
The patent replaces manual data gathering and analysis with an automated computer-based system that automatically collects scanner data, performs alignment calculations, and generates reports. This substitution of manual mechanical processes with automated computational processes eliminates time delays while maintaining alignment accuracy assessment capabilities.
Solution Approach 2:
The system enables self-service alignment monitoring by automatically performing the alignment checking function without requiring manual intervention. The computer system autonomously gathers data from scanners, analyzes alignment status, and provides results, allowing the manufacturing process to self-monitor and self-correct alignment issues without external assistance.
2Ease of operation
If manual alignment correction is undertaken only when problems are discovered, then domain knowledge requirements are reduced, but poor sheet quality can persist undetected
Solution Approach 1:
The patent implements continuous feedback by automatically monitoring scanner alignment and immediately notifying operators when misalignment is detected. The system provides real-time feedback on alignment status through automated reports and alerts, enabling immediate corrective action before poor sheet quality develops. This continuous feedback loop maintains reliability by ensuring alignment issues are detected and addressed promptly.
Solution Approach 2:
The system performs preliminary alignment checking continuously in the background, assessing alignment status before problems manifest in the final product. By proactively monitoring alignment and alerting operators in advance, the system enables preliminary corrective action to be taken before poor sheet quality occurs, maintaining both ease of operation and product reliability.
3Area of stationary object
If multiple scanners are used at different positions along the machine direction, then comprehensive cross-directional measurement coverage is achieved, but profile misalignment between scanners occurs
Solution Approach 1:
The patent introduces a computer-based intermediary system that mediates between multiple scanners by automatically calculating and determining the relative alignment of profiles from different scanners. This intermediary computational system processes data from all scanners, performs cross-correlation analysis to detect misalignment, and provides correction guidance, thereby maintaining manufacturing precision across the extended measurement coverage area.
4Productivity
If scanner misalignment is not corrected, then production continues without interruption, but inaccurate quality control and poor sheet quality result
Solution Approach 1:
The system maintains productivity by providing continuous automated monitoring that alerts operators to alignment issues without interrupting production. The feedback mechanism enables quality control accuracy to be maintained by immediately notifying operators of misalignment conditions, allowing them to make corrections during routine maintenance intervals rather than waiting for quality problems to manifest.
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 enables immediate detection and correction of scanner misalignment, improving the accuracy of quality control and reducing the likelihood of poor sheet quality by automating the alignment process, thus enhancing the efficiency and reliability of sheet manufacturing.
Implementation Method 1
An automatic monitoring system using cross-correlation analysis to track changes in profile misalignment over time
Data Source
AI summary
Profile alignment with cross-correlation is employed to determine the alignment between two measured profiles taken at different locations along a sheet of material. Aligning two profiles in sheet manufacturing is critical so that the coating weight on the sheet can be calculated. Coat weight profile is calculated by subtracting the weight of the sheet prior to coating from the measured total weight of the coated sheet after coating. When profiles are not aligned correctly for this subtraction, the coat weight profile will be inaccurate and corrective control actions for apparent deviations in coat weight may be applied to the wrong part of the sheet and may result in poor quality. Profile misalignments are monitored by repeatedly performing cross-correlation analysis as new measurement data becomes available. Offset is tracked over time and displayed. Automatic alerts are triggered when the offset deviates from zero and/or changes in value (within certain thresholds).