Disposable Diaper Slit Layout for Deformation and Leak Control

Solution Overview

Problem

Existing disposable diapers fail to adequately suppress deformation of the absorbent body in the ventral, crotch, and dorsal regions during wear, leading to discomfort and potential leakage of bodily waste.

Innovation Solution

A disposable diaper design featuring a rectangular absorbent body with oblique and straight parts, paired slits, and elastic members to stabilize the body during movement, minimizing deformation and preventing leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional slits are provided in the absorbent body, then comfort is improved, but deformation suppression is insufficient

Engineering Contradiction:

ImprovecomfortVSAvoiddeformation suppression

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The absorbent body is divided into multiple functional zones (ventral, crotch, dorsal sections) with different slit configurations in each zone. The ventral region has no slits for stability, the crotch region has controlled slits for comfort, and the dorsal region has slits for flexibility, allowing each segment to address specific requirements independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent body are given different structural properties through selective slit placement. The crotch section has slits at specific positions and orientations to balance comfort and deformation control, while other regions have different configurations suited to their functional requirements

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the absorbent body is made stable, then deformation is suppressed, but comfort is reduced

Engineering Contradiction:

Improvedeformation suppressionVSAvoidcomfort

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The absorbent body is divided into multiple functional zones (ventral, crotch, dorsal sections) with different slit configurations in each zone. The ventral region has no slits for stability, the crotch region has controlled slits for comfort, and the dorsal region has slits for flexibility, allowing each segment to address specific requirements independently

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent body are given different structural properties through selective slit placement. The crotch section has slits at specific positions and orientations to balance comfort and deformation control, while other regions have different configurations suited to their functional requirements

Inventive Principle:

Principle #3Local quality

3Ease of operation

If slits are provided to improve comfort, then wearability is enhanced, but leakage risk increases

Engineering Contradiction:

ImprovewearabilityVSAvoidleakage risk

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Different regions of the absorbent body are given different structural properties through selective slit placement. The crotch section has slits at specific positions and orientations to balance comfort and deformation control, while other regions have different configurations suited to their functional requirements

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The slit configuration is designed to preemptively counteract deformation forces that could lead to leakage. By providing controlled slit patterns in the crotch region, the structure anticipates and compensates for movement-induced stresses before they can cause harmful leakage

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS12465529B2Disposable diaper

Publication Date: 2025.11.11 DAIO PAPER CORP

AI summary

A disposable diaper whose deformation while the wearer is walking, is suppressed to alleviate discomfort, first slits extend from ventral section to the front of crotch section in their side portions at a distance from and in parallel to first oblique parts, a second slit extends in parallel to straight parts, in the central part in the width direction of middle area of the crotch section, third slits extend at a distance from second oblique parts in the back of the crotch section in its side portions, with the back end of each third slit located outwards of its front end, fourth slits extend crossing each other in parallel to the second oblique parts, in the middle area of dorsal section, back ends of the first slits are located inwards of the straight parts, and front ends of the fourth slits are at a longitudinal distance from the back ends of the third slits.