Plastic Film Temperature Monitoring for Quality Control
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Solution Overview
Problem
Current methods for monitoring film quality during plastic film production are inefficient, leading to high levels of reject material and increased effort due to offline quality control and reliance on frost line position, which is influenced by various process parameters.
Innovation Solution
A method that determines the temperature of the film material during transport, using a temperature-dependent definition to evaluate and predict the quality condition independently of the frost line position, allowing for real-time adjustment of process parameters such as vacuum and speed to ensure desired mechanical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offline quality control with laboratory tests is conducted, then quality assurance is achieved, but production time is lost and reject material increases
Solution Approach 1:
The patent replaces mechanical offline laboratory testing with an optical measurement system that uses light reflection to determine film temperature and quality characteristics in real-time during production, eliminating the need to stop production for quality checks
Solution Approach 2:
The patent introduces temperature as an intermediary parameter that correlates with film quality characteristics. By measuring temperature via light reflection and using it to predict mechanical properties, the system enables real-time quality monitoring without direct mechanical testing of the film
2Measurement precision
If frost line position is used to determine film quality, then mechanical properties can be assessed, but process complexity increases due to dependence on multiple process parameters
Solution Approach 1:
The patent extracts the essential quality information from the complex frost line phenomenon by directly measuring film temperature through light reflection. This isolates the critical parameter (temperature) from other influencing factors like cooling rate and frost line position, simplifying the measurement system
Solution Approach 2:
The patent changes the measurement parameter from observing frost line position (which depends on multiple process parameters) to directly measuring film temperature through optical means. This parameter substitution simplifies the relationship between measurement and quality characteristics
3Reliability
If sampling is increased to improve quality control, then quality monitoring improves, but effort and reject material increase
Solution Approach 1:
The patent implements continuous real-time quality monitoring during film production through optical temperature measurement, replacing discontinuous offline sampling. This allows quality assessment at every moment without stopping production or increasing manual sampling effort
Solution Approach 2:
The system enables the production process to self-monitor its own quality characteristics in real-time through automated optical temperature measurement and correlation with quality parameters, eliminating the need for external laboratory testing and manual sampling
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
This approach simplifies and cost-effectively monitors film quality, reducing reject material and improving overall quality by allowing for precise adjustment of cooling processes to meet quality standards, thereby enhancing the production efficiency and product consistency.
Implementation Method 1
The transport device is generally cooled, so that the film material is cooled during rotation and/or movement of the transport device
Implementation Method 2
the film material undergoes a temperature profile and at a certain point in time falls below its own solidification temperature, so that it begins to solidify
Data Source
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Figure 2
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AI summary
The invention relates to a method for monitoring a film quality in the production of a plastic film, comprising the following steps: - determining a first temperature (10) of a film material (1) of the plastic film during a transport of the film material (1), in which the film material (1) is cooled along a conveying direction (2) of the film material (1). The invention further relates to a film machine (50) comprising a device for monitoring a film quality in the production of a plastic film.