Absorbent Body Thickness Control via Sensor Feedback
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Solution Overview
Problem
The existing manufacturing process for absorbent articles, such as disposable diapers, results in a trial-and-error method for adjusting the pressing device to achieve the target thickness of the absorbent body, leading to reduced manufacturing yield and discarded products due to thickness failures.
Innovation Solution
An apparatus and method involving a pressing device, a pair of rollers, a sensor, and a controller to measure and adjust the thickness of the absorbent body, ensuring it falls within the target range by setting the gap between the rollers based on real-time thickness measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the pressing device is adjusted in a trial-and-error manner to achieve target thickness, then the thickness control can be achieved, but the adjustment time increases and manufacturing yield decreases
Solution Approach 1:
A sensor measures the thickness of the absorbent body in real-time during production, and this measurement information is fed back to automatically adjust the pressing device parameters, replacing the trial-and-error method with a closed-loop control system that eliminates waste while maintaining precision
Solution Approach 2:
The manual trial-and-error adjustment process is replaced by an automated control system that uses sensor measurements to dynamically adjust the pressing device, substituting human-operated mechanical adjustment with an automated feedback-controlled mechanical system
2Manufacturing precision
If the pressing device is adjusted in a trial-and-error manner, then thickness control can be achieved, but the adjustment process becomes time-consuming
Solution Approach 1:
Real-time thickness measurement by the sensor provides immediate feedback to the control system, enabling dynamic adjustment of the pressing device parameters without manual intervention, thus eliminating the time-consuming trial-and-error adjustment process while maintaining precise thickness control
Solution Approach 2:
The system performs self-adjustment by automatically modifying the pressing device parameters based on sensor feedback, eliminating the need for external human operators to perform time-consuming manual adjustments
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 reduces the burden of adjusting the pressing device, minimizes defective products, and decreases the number of discarded absorbent articles by maintaining the absorbent body's thickness within the target range, thereby improving manufacturing efficiency.
Implementation Method 1
a sensor that outputs measurement information relating to the thickness of the absorbent body at a position between the pressing device and the pair of rollers
Implementation Method 2
a pressing device that reduces the thickness of the absorbent body transported in a transport direction, by sandwiching and pressing the absorbent body in a thickness direction orthogonal to the transport direction
Implementation Method 3
a pair of rollers that is positioned on a downstream side along the transport direction than the pressing device, and rotates while passing the absorbent body through a gap formed by outer circumferences of the pair of rollers opposing each other
Data Source
AI summary
Provided is an apparatus for reducing a thickness of an absorbent body having liquid absorbent fiber as a main material. The apparatus includes a pressing device that reduces the thickness of the absorbent body transported in a transport direction, by sandwiching and pressing the absorbent body in a thickness direction orthogonal to the transport direction, a pair of rollers that are positioned on a downstream side of the pressing device along the transport direction, and rotate while passing the absorbent body through a gap formed by outer circumferences of the pair of rollers opposing each other, a sensor that outputs measurement information relating to the thickness of the absorbent body at a position between the pressing device and the pair of rollers, and a controller that sets a size of the gap between the pair of rollers based on the measurement information.