Absorbent Core Density Zoning for Body Fit and Fluid Distribution

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Solution Overview

Problem

Existing absorbent articles face challenges in achieving improved body fit and fluid distribution, leading to reduced efficiency in collecting bodily fluids and potential leakage.

Innovation Solution

The absorbent core features zones or lines of absorbent material with a lower density than the bulk material, forming channels for fluid distribution and allowing defined folding under lateral compressive forces, enhancing both body fit and fluid absorption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the absorbent article is made to conform to the human body through lateral deformation, then body fit is improved, but the surface area in direct contact with the body is reduced due to bunching

Engineering Contradiction:

Improvebody fitVSAvoidsurface area in contact with body

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The absorbent core is divided into distinct zones with different densities - a first zone with higher density and a second zone with lower density. This segmentation allows different parts of the core to perform different functions: the higher density first zone provides structural support while the lower density second zone enables controlled deformation and folding to improve body fit without excessive bunching.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different zones of the absorbent core are assigned different density properties tailored to their specific functions. The first zone has higher density for structural integrity and fluid distribution, while the second zone has lower density for flexibility and conformability. This local differentiation of material properties resolves the contradiction between maintaining surface area and achieving body fit.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If zones or lines of lower density absorbent material are introduced to enable defined folding, then body fit is improved, but the complexity of the absorbent core structure increases

Engineering Contradiction:

Improvebody fitVSAvoidabsorbent core structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention changes the density parameter of the absorbent material to create functional zones. By varying the density (a fundamental material parameter) rather than adding complex mechanical structures or multiple components, the patent achieves defined folding behavior and improved body fit while keeping the overall structure relatively simple and manufacturable.

Inventive Principle:

Principle #35Parameter changes

3Strength

If material is removed to form lines of reduced bending resistance, then flexibility is improved, but the absorbent capacity is reduced

Engineering Contradiction:

Improvebending resistanceVSAvoidabsorbent capacity

Core Design Contradiction:

StrengthVSQuantity of substance

Solution Approach 1:

Instead of removing material to create lines of reduced bending resistance (as done in prior art), this invention inverts the approach by adding or concentrating lower density absorbent material in specific zones. This inverted approach maintains full absorbent capacity across the entire core while still achieving the desired flexibility and folding behavior through the density differentiation.

Inventive Principle:

Principle #13The other way round (Inversion)

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 absorbent core improves body fit by defined folding and accelerates fluid distribution, reducing leakage and enhancing overall absorbent article performance.

Implementation Method 1

zones or lines of absorbent material having a density which is lower than the density of the bulk absorbent material in the absorbent core

Methodology Applied

Scientific EffectDensity difference: Density Gradient

Implementation Method 2

zones or lines of absorbent material having a density which is lower than the density of the bulk absorbent material in the absorbent core for improved body fit and/or improved fluid distribution

Methodology Applied

Scientific EffectDensity difference: Density Gradient

Data Source

PatentUS12527702B2Absorbent core for an absorbent article

Publication Date: 2026.01.20 ONTEX GRP NV

AI summary

An absorbent core for an absorbent article is provided an absorbent material, the absorbent core comprising one or more first zones comprising a first amount of absorbent material and one or more second zones comprising a second amount of absorbent material, wherein each second zone is at least partly delimited from the other second zones by the one or more first zones characterized in that the first amount of bulk absorbent material is different than the second amount of absorbent material, each amount of absorbent material being determined as weight per unit area.