Absorbent Article Crotch Stretchable Portion Leakage Prevention
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Solution Overview
Problem
Conventional pull-on disposable diapers suffer from side leakage due to the absorbent core material hanging and the side flaps not providing adequate contact with the wearer's groin, leading to insufficient prevention of body fluid leakage.
Innovation Solution
An absorbent article design featuring a crotch stretchable portion and leak-proof walls with elastic members that stretch and contract, allowing the absorbent core to be securely positioned and the leak-proof walls to maintain close contact with the wearer, preventing side leakage through a joined part that overlaps with the crotch stretchable portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core material absorbs body fluid, then the absorbency function is improved, but the core material hangs and falls apart from the excretion part, causing side leakage
Solution Approach 1:
The patent applies a crotch stretchable portion made of elastic material that can flex and adapt to the wearer's body contours. This flexible component maintains continuous contact between the absorbent core and the excretion part even when the core absorbs fluid and changes shape, preventing the core from falling apart and eliminating side leakage pathways.
Solution Approach 2:
The crotch stretchable portion is designed to dynamically adapt to movements and changes in the wearer's body. The elastic material allows the structure to stretch and contract, maintaining optimal positioning of the absorbent core relative to the excretion part throughout various activities, thereby ensuring continuous side leakage prevention.
2Area of stationary object
If the side flaps are in linear close contact with the groin, then the contact area is maximized, but the contact strength is insufficient to dam up body fluid
Solution Approach 1:
The leak-proof walls are constructed with flexible material that can conform to the three-dimensional contours of the wearer's groin. This flexibility allows the walls to maintain strong contact pressure across the entire contact area, creating an effective barrier that can dam up body fluid flow while preserving maximum contact area.
Solution Approach 2:
The leak-proof walls are designed to stand up in the thickness direction, creating a three-dimensional barrier rather than a flat linear contact. This vertical dimension allows the walls to physically block and dam up body fluid flow while maintaining contact with the groin, transforming the contact from a two-dimensional surface interaction to a three-dimensional barrier structure.
3Reliability
If the leak-proof walls stand on the skin side, then the barrier function is improved, but the contact with the wearer may be insufficient without proper joining
Solution Approach 1:
The patent merges the leak-proof wall structure with the crotch stretchable portion through the joined part. This integration ensures that the standing leak-proof walls remain firmly attached to the flexible crotch portion, maintaining reliable contact with the wearer's groin while preserving the barrier function. The joined part acts as a connector that combines the benefits of both structures.
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
The design effectively prevents side leakage by ensuring the absorbent core is securely positioned and the leak-proof walls maintain close contact with the wearer, enhancing the absorbent article's ability to contain body fluids without spreading.
Implementation Method 1
each of the leak-proof walls including an elastic member that stretches and contracts in the longitudinal direction
Implementation Method 2
the crotch stretchable portion being capable of stretching and contracting in at least one direction of the longitudinal direction and the width direction
Implementation Method 3
when, for example, a core material of the panel member absorbs body fluid
Data Source
AI summary
An absorbent article includes: an absorbent main body including an absorbent core; and leak-proof walls on respective widthwise side portions of the absorbent main body. Each leak-proof wall is capable of standing on a skin side in the thickness direction, and includes a skin-side portion and a non-skin-side portion. A joined part is formed by joining at least partially facing surfaces of the skin-side and non-skin-side portions. The absorbent main body includes a crotch stretchable portion in a central portion in the width direction and the longitudinal direction, and the crotch stretchable portion stretches/contracts in at least one of the longitudinal direction and the width direction. The joined part is provided inside a distal end of the leak-proof wall and outside the crotch stretchable portion in the width direction. A part of the joined part and a part of the crotch stretchable portion at least overlap in the longitudinal direction.