Absorbent Pad With Integrated RFID Pocket
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Solution Overview
Problem
Conventional absorbent articles, such as diapers, require additional manufacturing steps and increased complexity due to the need for a pocket on the outer surface for signal transmitters, leading to higher costs and potential liquid leakage through holes for sensing wires.
Innovation Solution
An absorbent pad design with a lining layer, liquid-impermeable layer, and sensing wires integrated on the absorbent layer, where the RFID tag is removably received in a defined space, eliminating the need for external pockets and reducing manufacturing complexity by using a release paper to prevent adhesion and allowing for simultaneous cutting of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pocket is added on the outer surface of the liquid-impermeable layer for receiving the signal transmitter, then the signal transmitter can be properly positioned and protected, but the manufacturing complexity and cost increase due to additional manufacturing steps and material consumption
Solution Approach 1:
The patent merges the pocket structure with the liquid-impermeable layer itself, making the pocket an integrated part of the layer rather than a separate component. This is achieved by forming the pocket as an internal cavity within the liquid-impermeable layer during the manufacturing process, eliminating the need for separate pocket formation steps and reducing overall device complexity while maintaining the protective and positioning functions.
Solution Approach 2:
The liquid-impermeable layer is designed to serve multiple functions: it provides liquid impermeability, contains the integrated pocket for signal transmitter positioning, and acts as a structural component of the absorbent article. This multi-functionality reduces the need for separate dedicated components, thereby simplifying manufacturing while ensuring reliable signal transmitter placement.
2Reliability
If sensing wires extend through holes in the liquid-impermeable layer to contact the signal transmitter, then electrical contact can be established, but liquid leakage occurs through the same holes
Solution Approach 1:
The signal transmitter and sensing wires are nested within the pocket structure that is integrated into the liquid-impermeable layer. The sensing wires make electrical contact with the signal transmitter through the absorbent layer without penetrating the liquid-impermeable layer, as the pocket provides an internal pathway and connection interface that maintains the liquid barrier while enabling electrical connectivity.
Solution Approach 2:
The pocket structure acts as an intermediary that facilitates electrical contact between the sensing wires and signal transmitter without requiring direct penetration of the liquid-impermeable layer. The pocket provides a controlled internal environment where electrical connections can be made while the liquid-impermeable layer remains intact, preventing liquid leakage.
3Manufacturing precision
If sensing wires are cut and assembled separately before assembling with other components, then proper positioning and electrical connection can be achieved, but the manufacturing process becomes more complex with additional steps
Solution Approach 1:
The sensing wires are pre-positioned on the absorbent layer before the liquid-impermeable layer is attached. This preliminary positioning ensures correct placement and electrical connection readiness, while the subsequent attachment of the liquid-impermeable layer with integrated pocket completes the assembly in a streamlined sequence, improving manufacturing efficiency without sacrificing precision.
Solution Approach 2:
The patent combines multiple assembly steps into a more integrated process. The sensing wires are positioned on the absorbent layer, and then the liquid-impermeable layer with its integrated pocket is attached in one continuous operation, eliminating separate cutting and assembly steps for the sensing wires. This merging of operations maintains precise positioning while significantly improving manufacturing efficiency.
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
Simplifies the manufacturing process, reduces material consumption, and prevents liquid leakage while maintaining effective wetness detection through wireless communication with an RF reader, providing timely alerts for caregivers.
Implementation Method 1
the sensing wires 141 of the sensing conductor set 14 cooperatively form an electrical loop due to wetness of the absorbent layer 13
Implementation Method 2
an adhesive material is disposed between the lining layer and the liquid-impermeable layer, such that the adhesive material prevents the lining layer from adhering to the liquid-impermeable layer at a plurality of areas
Data Source
AI summary
An absorbent article for use with a RF reader includes an absorbent pad and a RFID tag. The absorbent pad includes a lining layer, a liquid-impermeable layer, an absorbent layer, and a plurality of sensing wires. The liquid-impermeable layer is attached to the lining layer. The absorbent layer is disposed between the lining layer and the liquid-impermeable layer. The lining layer and the liquid-impermeable layer define a receiving space having an opening located at a side portion of the absorbent pad. The sensing wires are provided on the absorbent layer and extend into the receiving space. The RFID tag is received in the receiving space and contacts electrically the sensing wires when received in the receiving space.