Extrusion Plant Control with Warm-Profile Feedback
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Solution Overview
Problem
Existing extrusion systems produce non-conforming extrudates due to delayed parameter adjustments, leading to waste and inefficiency, as profile measurements are taken far downstream, resulting in time delays and inadequate quality control.
Innovation Solution
A device and method for controlling an extrusion system that includes a profile determination unit to measure the warm extrudate profile contactlessly, a modeling unit to predict the cold profile, a comparison unit to determine deviations, and a parameter determination unit to optimize process parameters in real-time, minimizing deviations from the specified profile.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If profile measurements are taken far downstream to ensure accurate measurement, then measurement precision is improved, but response time deteriorates causing delayed parameter adjustments
Solution Approach 1:
The system performs preliminary action by measuring the warm extrudate profile immediately after extrusion at a close distance (5-50 cm) from the extrusion head, rather than waiting for the extrudate to cool downstream. This early measurement enables prompt detection of profile deviations and immediate parameter adjustments, eliminating the time delay inherent in downstream measurement approaches while maintaining measurement accuracy through contactless optical sensing
Solution Approach 2:
The patent replaces mechanical contact-based measurement systems with contactless optical measurement technology. The profile determination unit uses optical methods to measure the warm extrudate profile without physical contact, enabling measurements to be taken at close proximity to the extrusion head without interfering with the extrusion process or requiring the extrudate to travel downstream to a measurement point
2Measurement precision
If parameter adjustments are made based on delayed measurements, then measurement accuracy is maintained, but manufacturing precision deteriorates due to out-of-spec extrudate production
Solution Approach 1:
The system implements continuous feedback control by measuring the warm extrudate profile in real-time and using this information to adjust extrusion parameters. The control unit receives profile data from the profile determination unit and automatically modifies process parameters to maintain profile accuracy, creating a closed-loop control system that prevents out-of-spec extrudate production rather than detecting it after the fact
Solution Approach 2:
The system takes preliminary action by detecting profile deviations immediately while the extrudate is still warm and adjustable, before the deviations become permanent. Early detection enables corrective parameter adjustments to be made while the material is still pliable, ensuring manufacturing precision is maintained throughout the extrusion process
3Measurement precision
If downstream measurement is used to ensure accurate profile detection, then measurement precision is improved, but productivity deteriorates due to waste material disposal and reconfiguration time
Solution Approach 1:
The system enables self-service by implementing real-time monitoring and automatic parameter adjustment, allowing the extrusion system to self-correct profile deviations without manual intervention. The control unit automatically modifies extrusion parameters based on profile measurements, eliminating the need for operators to stop production for adjustments or waste material disposal, thereby maintaining high productivity
Solution Approach 2:
Continuous feedback control prevents the accumulation of out-of-spec material by immediately detecting and correcting profile deviations. This eliminates waste material disposal and minimizes reconfiguration time, as the system maintains optimal parameters through automatic adjustment rather than requiring manual intervention and material scrapping
4Device complexity
If contactless profile determination is implemented, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent replaces complex mechanical contact-based measurement systems with optical measurement technology. The profile determination unit uses contactless optical methods to measure the warm extrudate profile, simplifying the device structure by eliminating mechanical contact components while maintaining or improving measurement precision through non-invasive optical sensing
Data Source
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AI summary
The problem of early detection of deviations in the quality of extrudates and of correcting process parameters to increase the degree of utilisation of material and obtain greater efficiency of extrusion plants has not yet been solved with sufficient precision. According to the invention, the problem is solved by providing a simulated cold extrudate profile, which indicates a profile of an extrudate in a cooled state, by means of a cold-profile modelling unit, by determining a deviation of the cold extrudate profile from a specific extrudate profile by means of a comparison unit, and by optimising the process parameters by means of a parameter determination unit on the basis of the deviation, in such a way that a deviation between a produced cold extrudate profile and the specific extrudate profile is small.