Leak-Proof Walls with Segmented Side Flaps for Diaper Leakage

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

The existing pull-on disposable diapers suffer from unstable side flaps that fail to maintain close contact with the wearer's groin, leading to insufficient side leakage prevention due to drooping caused by fluid absorption and movement.

Innovation Solution

An absorbent article design featuring a low-basis-weight portion in the central widthwise area of the absorbent core, paired with leak-proof walls that include elastic members capable of stretching and contracting, and a joined part formed by partially joining the surfaces of the skin-side and non-skin-side portions, allowing the leak-proof walls to stand on the skin side and maintain close contact with the wearer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If side flaps are made to linearly stand from the side edges of the absorbent core to contact the wearer's groin, then side leakage prevention is intended, but the side flaps become unstable and contact quality deteriorates due to drooping caused by fluid absorption and movement

Engineering Contradiction:

Improveside leakage preventionVSAvoidside flap stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The side flap is divided into multiple sections: a first section extending from the side edge of the absorbent core, a second section extending from the first section, and a free end section. This segmentation allows each section to perform different functions - the first section provides structural support, the second section maintains contact stability, and the free end section ensures continuous contact with the wearer's body during movement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The side flap is designed with dynamic characteristics that allow it to adapt to wearer movement and absorbent core drooping. The multi-section structure enables the flap to flex and reconfigure while maintaining contact with the wearer's groin area, transforming from a rigid linear structure to a dynamic adaptive form that responds to changing conditions.

Inventive Principle:

Principle #15Dynamics

2Quantity of substance

If the absorbent core absorbs body fluid, then absorption function is improved, but the core material droops causing side flaps to fall apart from the groin

Engineering Contradiction:

Improvebody fluid absorptionVSAvoidabsorbent core shape

Core Design Contradiction:

Quantity of substanceVSShape

Solution Approach 1:

The side flap segmentation allows the structure to accommodate core drooping by distributing the contact function across multiple sections. As the core absorbs fluid and droops, different sections of the side flap can independently adjust to maintain contact with the wearer's body.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The side flap's dynamic multi-section structure adapts to the changing shape of the absorbent core as it absorbs fluid. The flap can flex and reconfigure to maintain effective contact with the wearer's groin area despite the core's deformation from fluid absorption.

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If the wearer moves, then usability is improved, but the side flaps fall apart from the groin reducing side leakage prevention

Engineering Contradiction:

Improvewearer movement freedomVSAvoidside leakage prevention

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The side flap is designed as a dynamic multi-section structure that moves with the wearer. The segmented construction allows the flap to flex and adapt during wearer movement, maintaining contact with the groin area and preserving side leakage prevention functionality throughout various activities.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The multi-section side flap structure allows different portions to move independently during wearer activity, enabling the flap to maintain contact through a range of motions while the wearer moves freely.

Inventive Principle:

Principle #1Segmentation

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 design enhances the effectiveness of side leakage prevention by ensuring stable contact between the leak-proof walls and the wearer, reducing the likelihood of side leakage and drooping of the absorbent core.

Implementation Method 1

each of the leak-proof walls including an elastic member that stretches and contracts in the longitudinal direction

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11357670B2Absorbent article with leak-proof walls

Publication Date: 2022.06.14 UNI CHARM CORP

AI summary

An absorbent article including an absorbent main body including an absorbent core; and a pair of leak-proof walls. The pair of leak-proof walls are on respective widthwise side portions of the absorbent main body. Each of the leak-proof walls is capable of standing on a skin side in the thickness direction. The absorbent core includes a low-basis-weight portion in a widthwise central portion. The low-basis-weight portion has a basis weight of the absorbent core smaller than the basis weight in a surrounding portion. A joined part is formed by joining a surface of the skin-side portion and a surface of the non-skin-side portion, the surfaces facing to each other. The joined part is provided inside a distal end of the leak-proof wall and outside the low-basis-weight portion in the width direction. A part of the joined part and a part of the low-basis-weight portion overlap in the longitudinal direction.