Plastic Moisture Detection via 50-1000 GHz Electromagnetic Wave Absorption
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Solution Overview
Problem
The Karl Fischer method, although accurate for measuring water in plastics, is time-consuming and not suitable for real-time measurements, necessitating a more rapid and accurate method for determining moisture content in plastics.
Innovation Solution
Irradiating plastics with electromagnetic waves of 50 GHz to 1000 GHz and measuring the remaining waves to calculate moisture content, using a reference plastic's known moisture state to estimate the moisture state of unknown plastics, either through direct comparison or by applying a derived function from multiple known states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the Karl Fischer method is used to measure water in plastics, then measurement accuracy is improved, but measurement time increases and real-time measurement capability is lost
Solution Approach 1:
The patent replaces the chemical titration mechanism of the Karl Fischer method with an electromagnetic wave absorption measurement system. By measuring the absorption of electromagnetic waves in the 50 GHz to 1000 GHz range, the system achieves rapid water content determination without the time-consuming chemical reactions required by traditional methods, enabling real-time measurement while maintaining accuracy
Solution Approach 2:
The patent changes the measurement parameter from chemical concentration (Karl Fischer titration) to electromagnetic wave absorption characteristics. By utilizing the dielectric properties of water and its absorption of electromagnetic waves in the terahertz and millimeter wave ranges, the system transforms the measurement approach to achieve both speed and accuracy, resolving the time-accuracy tradeoff
2Productivity
If electromagnetic waves are used to measure moisture content rapidly, then measurement speed is improved, but measurement accuracy may be compromised compared to classical methods
Solution Approach 1:
The patent performs preliminary calibration by measuring the electromagnetic wave absorption characteristics of plastics with known water content. This establishes a reference relationship between absorption values and moisture content, which is then used to accurately determine unknown samples. The preliminary action of calibration ensures measurement accuracy while maintaining the rapid speed of electromagnetic wave measurement
Solution Approach 2:
The system uses feedback from the measured absorption characteristics to compute and determine the water content. By comparing the actual absorption measurement with the reference data obtained through preliminary action, the system accurately determines moisture content, ensuring that rapid measurement does not sacrifice precision
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 rapid and accurate measurement of moisture content in plastics, allowing for real-time assessment and ensuring adequate drying in the plastic material, thereby preventing inadequate drying issues.
Implementation Method 1
a plastic material... is irradiated with electromagnetic waves of a bandwidth of 50 GHz to 1000 GHz... the remaining electromagnetic waves not absorbed by the plastic are measured
Data Source
AI summary
[Object] To provide a method for detecting water in plastics and a water removal system for plastic materials that enable an amount of water contained in a plastic to be measured accurately and rapidly.[Solution Means] A plastic 13 of known moisture state is irradiated with electromagnetic waves of a bandwidth of 50 GHz to 1000 GHz from an oscillating apparatus 11 and remaining electromagnetic waves not absorbed by the plastic 13 are received and measured by a receiver 12 to acquire a first measurement value in advance. The plastic 13 of unknown moisture state is then irradiated with the electromagnetic waves of the bandwidth of 50 GHz to 1000 GHz from the oscillating apparatus and the remaining electromagnetic waves not absorbed by the plastic 13 are received and measured by the receiver 12 to acquire a second measurement value. The first measurement value and the second measurement value are compared to compute the moisture state of the plastic of unknown moisture state.