Microwave Resonator Plasticizer Measurement Correction
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Solution Overview
Problem
Existing methods for online measurement of plasticizer content in endless filter rods are inaccurate due to variations in material parameters and are often uneconomical, requiring additional measurement variables or expensive equipment.
Innovation Solution
A method using a single microwave resonator to measure resonance frequency shift and line broadening, with reference measurements to correct for long-term changes, allowing for reliable online detection and regulation of plasticizer content without additional expensive units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single microwave resonator is used for online measurement, then device complexity and cost are reduced, but measurement precision deteriorates due to material parameter variations
Solution Approach 1:
The patent implements feedback by continuously comparing the microwave measurement signal with reference values obtained from periodic offline measurements. The system automatically adjusts and corrects the online measurement results based on the reference data, thereby maintaining measurement precision while using a simple single-resonator setup. This feedback mechanism compensates for material parameter variations without requiring complex multiple-resonator systems.
Solution Approach 2:
The patent changes the measurement parameters by using a single resonator at one frequency point but varying the measurement conditions and reference comparison methods. By adjusting the reference measurement intervals and correction algorithms, the system achieves accurate plasticizer content determination without the need for multiple resonators or frequency points, thus reducing device complexity while maintaining precision.
2Measurement precision
If reference measurements are performed frequently to correct long-term changes, then measurement precision is improved, but productivity decreases due to increased measurement time
Solution Approach 1:
The patent applies periodic action by performing reference measurements at optimized intervals rather than continuously or too frequently. The system determines the optimal reference measurement frequency based on the rate of material parameter changes, conducting reference measurements only when necessary to update correction values. This periodic approach maintains measurement precision while minimizing interference with continuous filter rod production, thus preserving productivity.
3Measurement precision
If additional measurement variables or expensive equipment are used, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements self-service by enabling the single microwave resonator system to automatically perform its own calibration and correction using reference measurements taken during normal operation. The system self-corrects for material parameter variations by comparing online measurements with periodically updated reference values, eliminating the need for additional measurement variables or expensive external calibration equipment. This self-service capability maintains measurement precision while keeping the system simple and cost-effective.
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 accurate and economical online measurement and regulation of plasticizer content, compensating for short-term fluctuations and long-term changes, improving process reliability and reducing material waste.
Implementation Method 1
a resonance frequency shift (A) and a line broadening (B) of the resonance curve is measured at a passing endless filter rod using a microwave resonator
Implementation Method 2
measured using electromagnetic waves in a first wavelength range, while a further portion is measured using electromagnetic waves in a second wavelength range. In addition, a microwave measurement system with a measuring head is provided that has a microwave source and a microwave detector
Data Source
AI summary
A method for online measurement of a plasticizer in an endless filter rod, includes: measuring a resonance shift (A) and line broadening (B) with a microwave resonator at a passing endless filter rod, determining a mass per length of plasticizer from the measurement variables (A, B), measuring a reference mass of plasticizer applied per time with the application of the plasticizer onto the filter tow band, determining an averaged reference mass per length of plasticizer from the measured mass applied over a time period, averaging the values for mass per length of plasticizer, determined using the measurement variables over the same time in which the reference mass of plasticizer is determined, determining a deviation between the averaged reference value for the mass per length and averaged mass per length and correcting the mass per length, determined from the measurement variables of the microwave resonator, according to the determined deviation.