Layered Absorbent Article Structure for End-Leakage Control

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Solution Overview

Problem

Existing absorbent articles suffer from liquid leakage from the ends in the longitudinal direction due to incomplete absorption by the absorbent mat.

Innovation Solution

The absorbent article is structured with a first absorbent layer of crushed fibrous material and a second absorbent layer containing absorbent resin material, where the first layer overlaps and protrudes from the second layer, with groove parts facilitating faster liquid diffusion and absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single absorbent mat with sheet-like liquid-absorbing layer and fiber assembly layers is used, then the structure is simple and easy to manufacture, but liquid leaks from the ends in the longitudinal direction due to incomplete absorption

Engineering Contradiction:

Improveliquid absorption completenessVSAvoidabsorbent layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The absorbent mat is divided into two distinct absorbent layers: a first absorbent layer (crushed fibrous material) and a second absorbent layer (sheet-like material with absorbent resin). This segmentation allows each layer to perform specialized absorption functions, with the first layer handling initial liquid uptake and the second layer providing complete absorption, thereby preventing liquid leakage from the ends.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second absorbent layer is positioned within the region of the first absorbent layer, creating a nested configuration where the sheet-like material with absorbent resin is retained in the crushed fibrous material layer. This nesting arrangement ensures that liquid is absorbed completely by the second layer while maintaining a compact structure that prevents end leakage.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Productivity

If the sheet-like liquid-absorbing layer is positioned on the user's skin surface side, then liquid absorption efficiency is improved, but the thickness increases causing distance between water-retaining layers and user's skin to increase

Engineering Contradiction:

Improveliquid absorption efficiencyVSAvoiddistance between absorbent layers and skin

Core Design Contradiction:

ProductivityVSLength of moving object

Solution Approach 1:

The first absorbent layer (crushed fibrous material) is positioned on the user's skin surface side to provide initial liquid absorption and maintain close contact with the skin, while the second absorbent layer (sheet-like material with absorbent resin) is positioned on the opposite side for complete absorption. This local quality differentiation allows efficient liquid absorption without excessive thickness increase, as each layer is optimized for its specific position and function.

Inventive Principle:

Principle #3Local quality

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 structure inhibits liquid leakage by ensuring complete absorption, reducing skin irritation and discomfort by minimizing the distance liquid travels on the skin surface.

Implementation Method 1

a second absorbent layer formed with a sheet-like material retaining an absorbent resin material

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

The sheet-like liquid-absorbing layer 101 has a structure in which the absorbent resin powder 103 is held between two sheets of nonwoven fabric

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS20260076842A1Absorbent article

Publication Date: 2026.03.19 ZUIKO CORP

AI summary

Provided is an absorbent article capable of suppressing leakage of liquid that could not be absorbed from edges in the longitudinal direction. An absorbent article comprises: a first absorbent layer formed with a crushed fibrous material and extending in the longitudinal direction; and a second absorbent layer formed with a sheet-like material retaining an absorbent resin material and falling into the region of the first absorbent layer in the planar view. The first absorbent layer includes, in the planar view, an overlapping part that overlaps with the region of the second absorbent layer, and protruding parts that protrude in the longitudinal direction from the region of the second absorbent layer. The absorbent article is used so that the first absorbent layer is positioned on the side of a user and the second absorbent layer is positioned on the opposite side of the user relative to the first absorbent layer.