Web Unwinding Monitoring Using Optical Irregularity Tracking
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Solution Overview
Problem
Current surveillance methods for handling processes of wound materials, such as plastic films, are inadequate in accuracy and reliability due to unknown winding parameters and fluctuating foil thickness, leading to inaccuracies in determining errors and their causes.
Innovation Solution
A monitoring process that records irregularities in the handling of rail materials, correlates them with running parameters, and stores this data in a database to improve error detection and cause analysis, using detection units like cameras and measurement systems to track parameters like length and torque during processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If timestamp-based monitoring is used to track production progress, then time recording is simple, but measurement precision of error position is insufficient
Solution Approach 1:
The patent replaces the mechanical timestamp-based tracking system with an optical detection system that uses cameras and image processing to precisely locate errors on the web material. Instead of relying on time stamps alone, the system captures images of the web material at the moment of error detection and processes these images to determine the exact position, thereby substituting a low-precision mechanical timing system with a high-precision optical measurement system.
2Quantity of substance
If film thickness is measured to calculate winding diameter, then thickness information is available, but manufacturing precision is compromised by fluctuating thickness
Solution Approach 1:
The patent introduces an intermediary approach by using image processing of the web material's visual characteristics (such as pattern recognition or feature detection) rather than directly relying on thickness measurements to determine position. This intermediary method bypasses the problem of fluctuating thickness affecting diameter calculations, as it uses visual features that remain consistent despite thickness variations.
3Ease of manufacture
If air inclusions are present in the winding, then winding process is simpler, but measurement precision of data position is reduced
Solution Approach 1:
The patent extracts and isolates the relevant visual features from the web material images that are independent of physical defects like air inclusions. By focusing on features such as printed patterns, markings, or structural elements that remain consistent despite the presence of air pockets, the system determines position accuracy without being affected by manufacturing imperfections in the winding process.
Data Source
Figure 1~2
Figure 3~4e
Figure 5a~5c
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 partial unwinding (101) of a web material (11) from a reel (10), - Detection (102) of 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 carrying out an unwinding process and an unwinding system (5) for carrying out an unwinding process.