Absorbent Core High Rigidity Region for Leakage Control

Solution Overview

Problem

Disposable diapers face challenges in providing adequate space for feces in the crotch region, leading to increased leakage due to deformation under leg pressure, which collapses the absorbent core inward.

Innovation Solution

Incorporating a high rigidity region behind the folding line in the crotch area with a constricted absorbent core design, where the high rigidity region is longer in the front-back direction and located inside the outer edge of the absorbent core, preventing inward deformation and maintaining space for feces, while allowing easy leg movement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the absorbent core is made flexible to allow leg movement, then ease of operation is improved, but the absorbent core deforms inward causing loss of storage space

Engineering Contradiction:

Improveleg movementVSAvoidstorage space for feces

Core Design Contradiction:

Ease of operationVSVolume of moving object

Solution Approach 1:

The absorbent core is divided into multiple regions with different rigidity characteristics: a first region with higher rigidity behind the folding line to maintain storage space, and a second region with lower rigidity in front of the folding line to allow leg movement. This segmentation allows different parts of the absorbent core to fulfill different functional requirements simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent core are given different local properties: the region behind the folding line has higher rigidity to prevent inward deformation and maintain feces storage space, while the region in front of the folding line has lower rigidity to accommodate leg movement. This local differentiation of mechanical properties resolves the contradiction between flexibility and structural integrity.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the absorbent core is made rigid to maintain storage space, then volume stability is improved, but ease of leg movement deteriorates

Engineering Contradiction:

Improvestorage space stabilityVSAvoidleg movement

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The absorbent core is divided into multiple regions with different rigidity characteristics: a first region with higher rigidity behind the folding line to maintain storage space, and a second region with lower rigidity in front of the folding line to allow leg movement. This segmentation allows different parts of the absorbent core to fulfill different functional requirements simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent core are given different local properties: the region behind the folding line has higher rigidity to prevent inward deformation and maintain feces storage space, while the region in front of the folding line has lower rigidity to accommodate leg movement. This local differentiation of mechanical properties resolves the contradiction between flexibility and structural integrity.

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the absorbent core is compressed inward to fit the crotch region, then adaptability is improved, but the storage space for feces is reduced

Engineering Contradiction:

Improvecrotch region fitVSAvoidstorage space for feces

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The absorbent core is divided into multiple regions with different rigidity characteristics: a first region with higher rigidity behind the folding line to maintain storage space, and a second region with lower rigidity in front of the folding line to allow leg movement. This segmentation allows different parts of the absorbent core to fulfill different functional requirements simultaneously.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent core are given different local properties: the region behind the folding line has higher rigidity to prevent inward deformation and maintain feces storage space, while the region in front of the folding line has lower rigidity to accommodate leg movement. This local differentiation of mechanical properties resolves the contradiction between flexibility and structural integrity.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP3701923B1Absorbent article

Publication Date: 2024.01.10 UNI CHARM CORP

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AI summary

Provided is an absorbent article capable of having a larger absorbing area of body fluid on the buttocks side during wearing. An absorbent article (10) includes a front-back direction (L), a width direction (W) orthogonal to the front-back direction, a front waistline region (S1), a rear waistline region (S2), a crotch region (S3) disposed between the front waistline region and the rear waistline region, and an absorbent core (51) provided at least in the crotch region. A folding line (FL) for folding the absorbent article in half extends in the width direction in the crotch region. A high rigidity region (HR) is provided in a region including the center in the width direction behind the folding line. The high rigidity region is defined by a region having a rigidity higher than the rigidity of the region between the folding line (FL) and the high rigidity region (HR). The high rigidity region (HR) has a length in the front-back direction longer than a length (L1) between the folding line and a front edge of the high rigidity region.