Web Unwinding Monitoring Using Running-Meter Defect Correlation
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Solution Overview
Problem
Existing unwinding processes face inaccuracies in defect detection and cause analysis due to unknown winding parameters and varying film thickness, leading to unreliable conclusions about reel defects.
Innovation Solution
A monitoring method that partially unwinds a web material, detects irregularities using sensors, and correlates them with running parameters to determine the position and cause of defects, allowing for accurate analysis and visualization of issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If time indication alone is used to track reel data, then the system is simple to operate, but the measurement precision and reliability of defect cause analysis deteriorates due to unknown winding parameters and varying film thickness
Solution Approach 1:
The patent introduces a running meter as an intermediary measurement device between the reel and the defect detection system. This running meter actively tracks and stores the actual running meter reading at any point in time, serving as a reliable mediator that correlates defect positions with specific reel states, thereby resolving the precision issue without complicating the overall system operation
Solution Approach 2:
The patent replaces the simple time-based tracking system with an electronic measurement and storage system. Instead of relying solely on time stamps, the system uses a running meter to electronically track and store the actual reel running meter readings, which are then correlated with defect detection data to accurately determine defect positions and causes
2Quantity of substance
If weight indication is provided on reels, then some information about reel content is available, but the manufacturing precision of film thickness measurement deteriorates due to inability to determine actual film thickness
Solution Approach 1:
The patent implements a feedback mechanism where the running meter readings are continuously tracked and stored during the unwinding process. When defects are detected, the system retrieves the corresponding running meter reading to provide feedback about the actual reel state at the time of defect occurrence, enabling accurate correlation between defect position and reel characteristics including film thickness variations
3Device complexity
If film diameter calculation is performed based on assumed parameters, then the process is simple, but the measurement precision deteriorates due to air inclusions and varying thickness
Solution Approach 1:
The patent applies preliminary action by having the running meter continuously track and store the actual reel running meter readings during the unwinding process, before defect detection occurs. This preliminary data collection ensures that when defects are detected, the accurate running meter reading is already available for correlation, eliminating the need for complex real-time diameter calculations while maintaining high precision
Data Source
AI summary
The invention relates to a monitoring method (100) for monitoring an unwinding process of an unwinding device (2), comprising the following steps:at least partially unwinding (101) a web material (11) from a reel (10),detecting (102) at least one irregularity (12) of the web material (11) and/or the unwinding process.Furthermore, the invention relates to an unwinding device (2) for performing an unwinding process as well as an unwinding system (5) for performing an unwinding process.