Absorbent Article Conductive Layer Wetness Detection

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Solution Overview

Problem

Existing absorbent articles rely on capacitive coupling for wetness detection, which is prone to poor engagement compared to direct physical contact.

Innovation Solution

The absorbent article incorporates a first layer with conductive lines and a second porous layer overlaying the first layer, with conductive material applied to the porous layer to connect the conductive lines, enabling direct physical contact for wetness detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If capacitive coupling is used for wetness detection, then the detection can be implemented without direct contact, but the engagement reliability deteriorates

Engineering Contradiction:

Improvecontactless detectionVSAvoidengagement reliability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent introduces conductive material as an intermediary substance applied to the porous layer. This conductive material serves as a mediator that enables reliable electrical contact between the sensing electrodes and the external environment, resolving the contradiction by providing a physical conductive path while maintaining the benefit of integrated detection in the absorbent article structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If capacitive coupling is used for wetness detection, then the device structure is simplified, but the detection accuracy deteriorates

Engineering Contradiction:

Improvedetection structure complexityVSAvoidwetness detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The conductive material acts as an intermediary that enhances the electrical coupling between the sensing electrodes and the wetness source. By introducing this conductive layer, the system achieves better measurement precision through improved electrical contact, while the overall device structure remains relatively simple as the conductive material is applied directly to the existing porous layer without requiring complex additional components

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If conductive material is applied to porous layer, then direct physical contact for detection is achieved, but the manufacturing process complexity increases

Engineering Contradiction:

Improvedetection engagementVSAvoidmanufacturing process simplicity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent utilizes the porous structure of the absorbent article layer as the substrate for applying conductive material. The porous nature of the layer provides a large surface area and good adhesion properties for the conductive material, enabling reliable electrical contact. This approach leverages the existing functional structure of the absorbent article, reducing the need for separate complex manufacturing processes for the detection component

Inventive Principle:

Principle #31Porous materials

4Measurement precision

If conductive material is applied to porous layer, then detection effectiveness is improved, but the material composition complexity increases

Engineering Contradiction:

Improvewetness detection effectivenessVSAvoidmaterial composition complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent creates a composite structure by applying conductive material to the porous layer of the absorbent article. This composite approach combines the absorbent properties of the porous material with the electrical conductivity of the conductive material, achieving effective wetness detection. The composite material strategy allows the system to leverage the functional advantages of both materials while integrating them into a unified detection structure

Inventive Principle:

Principle #40Composite materials

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 configuration allows for reliable and effective detection of wetness in absorbent articles through direct physical contact, improving engagement and accuracy compared to capacitive coupling.

Implementation Method 1

conductive material is applied onto the second porous layer such that the conductive material impregnated into the second porous layer connects the conductive material on the top surface of the second porous layer to the conductive lines on the first layer

Methodology Applied

Scientific EffectConduction (electrical): Conduction (electrical)

Data Source

PatentUS12329615B2Absorbent article with conductive material on two layers

Publication Date: 2025.06.17 TULI RAJA SINGH

AI summary

An absorbent article is provided herein that comprises a first layer with at least two conductive lines being provided thereon along and throughout its length, and a second porous layer overlaying the first layer. Conductive material is applied onto the second porous layer such that the conductive material impregnated into the second porous layer connects the conductive material on the top surface of the second porous layer to the conductive lines on the first layer.