Absorbent Core With Profiled Lateral Absorbent Zones for Urine Absorption

Solution Overview

Problem

Existing absorbent articles for personal hygiene, such as diapers, face challenges in improving comfort, fit, and efficiency while maintaining or enhancing fluid acquisition and retention, and there is a need to reduce raw material usage, particularly superabsorbent polymers, for cost and sustainability reasons.

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 profiling ratio of at least 1.40, enhancing material distribution and absorption efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If absorbent material is distributed uniformly across the absorbent core, then manufacturing is simpler, but absorption efficiency and fluid management performance deteriorate

Engineering Contradiction:

Improveabsorbent material distribution simplicityVSAvoidabsorption efficiency

Core Design Contradiction:

Ease of manufactureVSProductivity

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 central region and lower at the lateral edges, optimizing absorption efficiency in areas where fluid pooling occurs while reducing material usage in less critical areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the absorbent core into distinct functional zones: central absorbent zones with higher basis weight for high absorption demand, and lateral absorbent zones with varying basis weight for fluid distribution and pooling management. This segmentation allows each zone to be optimized for its specific function.

Inventive Principle:

Principle #1Segmentation

2Reliability

If higher basis weight absorbent material is used throughout the absorbent core, then absorption capacity improves, but material costs and sustainability deteriorate

Engineering Contradiction:

Improveabsorption capacityVSAvoidraw material usage

Core Design Contradiction:

ReliabilityVSLoss of substance

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 central region and lower at the lateral edges, optimizing absorption efficiency in areas where fluid pooling occurs while reducing material usage in less critical areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the basis weight parameter spatially across the absorbent core. By varying the basis weight from the central region to the lateral edges, the patent optimizes the balance between absorption capacity and material usage, achieving reliable performance while reducing overall material consumption.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If absorbent material is concentrated in lateral absorbent zones, then fluid pooling and leakage are better managed, but comfort and fit deteriorate

Engineering Contradiction:

Improvefluid pooling managementVSAvoidcomfort and fit

Core Design Contradiction:

ProductivityVSEase of operation

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 central region and lower at the lateral edges, optimizing absorption efficiency in areas where fluid pooling occurs while reducing material usage in less critical areas.

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 improves urine absorption capacity and reduces material usage, maintaining comfort and fit by redistributing absorbent material to efficiently manage fluid pooling and leakage, thereby optimizing material usage and sustainability.

Implementation Method 1

The absorbent core absorbs and retains exudates

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

The absorbent material forming the absorbent layer comprises superabsorbent polymer particles

Methodology Applied

Scientific EffectPolymer absorption: Absorption (physical)

Data Source

PatentEP4616832A1Absorbent article with profiled lateral absorbent zones

Publication Date: 2025.09.17 PROCTER & GAMBLE CO

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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.