In-line Film Inspection Using Detectable Components
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Solution Overview
Problem
Current quality assurance methods for films, particularly packaging films, are time-consuming, laborious, and destructive, as they require offline analysis of small film samples to detect discontinuities, which are not representative of the entire film and can interrupt the production process.
Innovation Solution
A process that adds detectable components to film layers for automated inspection using a machine vision system to detect discontinuities over a substantial portion of the film, allowing for continuous, in-line monitoring without interrupting production, capable of identifying discontinuities as small as 2mm or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline analysis of film samples is used to detect discontinuities, then measurement precision is improved, but productivity deteriorates and time is lost
Solution Approach 1:
The patent replaces manual mechanical inspection methods with an automated optical inspection system using light sources and sensors. The system uses light transmission through the film to detect discontinuities automatically, eliminating the need for manual sampling and offline analysis, thereby maintaining measurement precision while dramatically improving productivity and inspection speed.
Solution Approach 2:
The patent introduces light as an intermediary substance to detect discontinuities in the film. By passing light through the film and measuring transmission variations, the system can identify discontinuities without direct physical contact or destruction of the film, enabling fast, non-destructive, continuous inspection that maintains accuracy while improving productivity.
2Measurement precision
If offline analysis of small film samples is used, then measurement precision is improved, but loss of time increases and film is destroyed
Solution Approach 1:
The patent enables continuous inspection of the film as it moves through the production line, rather than stopping for offline analysis of small samples. The optical system continuously scans the film, detecting discontinuities in real-time without interrupting production, thereby eliminating time loss while maintaining detection accuracy through consistent light transmission measurement.
Solution Approach 2:
The inspection system is self-acting and automatic, requiring no manual intervention for sampling or analysis. The system automatically passes light through the film, detects transmission variations, and identifies discontinuities without human involvement, enabling continuous operation that eliminates time loss and avoids destruction of film samples.
3Measurement precision
If small portion of film is inspected offline, then measurement precision is improved, but area of inspection deteriorates
Solution Approach 1:
The optical inspection system is designed to inspect the entire width and length of the film as it passes through, rather than limited small samples. The system uses multiple light sources and sensors arranged to cover the full film area, enabling universal inspection of all regions simultaneously, thereby maintaining measurement precision while dramatically increasing the inspected area to 100% of the film.
4Measurement precision
If destructive quality assurance methods are used, then measurement precision is improved, but loss of substance increases
Solution Approach 1:
The patent converts the potentially harmful effect of light exposure into a beneficial non-destructive inspection method. By using light transmission measurement, the system detects discontinuities without physical contact, chemical treatment, or mechanical stress that would destroy the film. The light itself becomes the inspection tool rather than a harmful factor, eliminating film destruction while maintaining detection accuracy.
Solution Approach 2:
The patent replaces destructive mechanical or chemical testing methods with optical measurement. Instead of physically cutting, heating, or chemically treating film samples, the system uses light transmission to detect discontinuities, substituting mechanical/chemical actions with optical detection, thereby maintaining measurement precision while eliminating loss of substance and film destruction.
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 quick and efficient quality checks of film layers for discontinuities, ensuring the film's suitability for its intended function without destroying the film or interrupting production, providing comprehensive and accurate assessments of film quality.
Implementation Method 1
The detecting of the presence of the functional layer and a discontinuity in the functional layer is carried out by inspecting the web with a machine vision system capable of detecting the presence or absence of the detectable component in the functional layer
Data Source
Figure 1A~1C
Figure 2
Figure 3~4
AI summary
The continuity of a functional layer of a web is assessed by forwarding the web, detecting the presence of the functional layer and a discontinuity and/or a thin region in the functional layer, and generating a signal in response to the discontinuity and/or thin region. The functional layer comprises a detectable component in a thermoplastic composition. The detecting is carried out by a machine vision system capable of detecting the detectable component in the functional layer. The detectable component can be active or passive. Also included are systems for carrying out the process.