RF SAP Detection for Absorbent Structure Control
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Solution Overview
Problem
Current image control systems in absorbent article manufacturing can only analyze outer contours and lack the capability to effectively monitor the inner parameters, such as the amount and distribution of superabsorbent polymers (SAP), especially at high production speeds.
Innovation Solution
A radio frequency (RF) based image control system that uses electromagnetic waves to detect SAP distribution and amount within absorbent structures, combined with a data processing system to adjust SAP supply and positioning in real-time, ensuring accurate and efficient production even at high speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an image control system is used to monitor absorbent article manufacturing, then outer contour positioning can be achieved, but inner parameter analysis (SAP amount and distribution) cannot be performed
Solution Approach 1:
The patent combines multiple detection systems (image control system for outer contours and RF analysis system for inner parameters) into a single integrated manufacturing control system. This merging allows simultaneous acquisition of both outer contour positioning data and inner parameter (SAP amount and distribution) data, resolving the contradiction between what can be measured and what information is lost.
Solution Approach 2:
The patent introduces radio frequency (RF) analysis as an intermediary detection method that can penetrate the absorbent article structure to measure inner parameters (SAP distribution and amount) without interfering with the existing image control system that measures outer contours. This intermediary system bridges the gap between external observation and internal measurement.
2Productivity
If contact free control systems are used for manufacturing, then production speed can be maintained, but real-time analysis of SAP distribution at high speed cannot be achieved
Solution Approach 1:
The patent implements continuous RF analysis during the manufacturing process, allowing real-time measurement of SAP distribution without interrupting or slowing down production. The RF analysis system operates continuously alongside the manufacturing line, maintaining both high productivity and measurement precision.
Solution Approach 2:
The patent replaces potential mechanical sampling or interruption-based measurement methods with contact-free RF analysis. This substitution allows for non-intrusive, real-time measurement of SAP distribution that does not require stopping the production line or physical interaction with the moving absorbent articles.
3Loss of information
If RF analysis system is implemented for SAP detection, then measurement of inner parameters is achieved, but system complexity increases
Solution Approach 1:
The patent designs the RF analysis system to serve multiple functions: detecting SAP amount, analyzing SAP distribution, and providing real-time feedback for process control. This multi-functionality reduces the need for separate specialized systems, thereby managing complexity while achieving comprehensive inner parameter detection.
Solution Approach 2:
The patent implements a feedback loop where RF analysis results are immediately used to adjust manufacturing parameters. This closed-loop control integrates the RF detection capability into the existing control architecture, managing system complexity by using the detection data for its intended purpose of process optimization rather than as a standalone measurement system.
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 precise control of SAP distribution and amount in absorbent structures, improving production efficiency and quality by allowing for real-time adjustments and maintaining high production rates.
Implementation Method 1
a SAP detection system comprising at least one electromagnetic wave (EM) radio frequency (RF) emitting emitter and at least one electromagnetic wave receiving detector
Data Source
Figure 1A~1B
Figure 1C~1E
Figure 2A
AI summary
The present invention relates to a manufacturing system for absorbent structures comprising superabsorbent polymer material. The manufacturing system comprises a quantitative SAP detection system operating be emitting electromagnetic radio frequency waves and receiving these after passing through the article, thereby allowing to determine the local amount of SAP at high productions speed and to take correction or expelling action.