Absorbent Core Profiling for Fluid Retention and Lower SAP Use

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Solution Overview

Problem

Existing absorbent articles for personal hygiene, such as diapers, face challenges in improving comfort, fit, and efficiency while reducing material usage, particularly superabsorbent polymer (SAP), while maintaining fluid acquisition and retention properties.

Innovation Solution

The absorbent core features longitudinally-extending channels free of absorbent material, with lateral absorbent zones having a higher basis weight towards the channels and lower towards the longitudinal side edges, and a profiled distribution of absorbent material with a Lateral Absorbent Zone Profile Ratio of at least 1.40.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If absorbent material is uniformly distributed across the absorbent core, then manufacturing is simpler, but fluid acquisition and retention efficiency is reduced

Engineering Contradiction:

Improvefluid acquisition and retention efficiencyVSAvoidabsorbent material distribution structure

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating lateral absorbent zones with different basis weights in different regions of the absorbent core. Specifically, the basis weight is higher in the lateral absorbent zones compared to the central zone, allowing the absorbent material to be concentrated where fluid accumulation is most likely to occur. This regional variation in absorbent material density improves fluid acquisition and retention efficiency without requiring uniform distribution throughout the entire core.

Inventive Principle:

Principle #3Local quality

2Loss of substance

If superabsorbent polymer (SAP) usage is reduced to save material costs, then cost and sustainability improve, but fluid retention capacity may be compromised

Engineering Contradiction:

ImproveSAP material usageVSAvoidfluid retention capacity

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

The patent applies parameter changes by varying the basis weight of the absorbent material across different zones of the absorbent core. The lateral absorbent zones have a higher basis weight than the central zone, optimizing the distribution of SAP particles to high-fluid-risk areas. This parameter variation allows for reduced overall SAP usage while maintaining fluid retention capacity, as the material is concentrated where it is most needed rather than being uniformly distributed throughout the entire core.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If the absorbent core is made thinner to improve comfort, then wearability improves, but fluid absorption capacity is reduced

Engineering Contradiction:

Improvecomfort and fitVSAvoidabsorbent material volume

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent applies local quality by creating a non-uniform basis weight distribution within the absorbent core thickness. The lateral absorbent zones have higher basis weight concentrated in specific regions, allowing the overall core to remain thin for comfort while still providing sufficient absorbent material volume in the lateral regions where fluid accumulation is most likely to occur. This localized concentration of absorbent material enables thin-profile design without sacrificing necessary absorption capacity.

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 design enhances the absorbent core's ability to efficiently manage fluid, reduces material usage, and maintains comfort and fit by redistributing absorbent material to better accommodate fluid pooling, thereby improving overall performance.

Implementation Method 1

The absorbent core absorbs and retains exudates

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

The absorbent core absorbs and retains exudates in order to keep the wearer's skin dry

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Data Source

PatentUS20250288473A1Absorbent article with profiled lateral absorbent zones

Publication Date: 2025.09.18 PROCTER & GAMBLE CO

AI summary

Absorbent article (20) for personal hygiene such as diaper comprising an absorbent core (28) having two lateral absorbent zones (61, 63) disposed between respectively between a first and second longitudinally-extending channels (26a, 26b) and a first and second longitudinal edges (604, 606) of an absorbent layer (60). The lateral absorbent zones are profiled in the transversal direction, so that the basis weight of the absorbent material is higher towards the respective channel than towards the respective longitudinal side edge.