Absorbent Core Channels and Cuff Contouring

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Solution Overview

Problem

Existing absorbent articles, particularly those with high superabsorbent polymer content, suffer from sagging and reduced effectiveness of barrier leg cuffs due to expansion, leading to increased leakage risk as they become saturated.

Innovation Solution

Incorporating longitudinally-extending channels within the absorbent core that are free of fibers and superabsorbent polymer, and designing the barrier leg cuffs to follow the anatomical fold lines between the legs and torso, enhancing their fit and adherence even under high load conditions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the absorbent core uses high superabsorbent polymer content to increase absorbency capacity, then the absorbent capacity is improved, but the barrier leg cuffs sag and lose effectiveness due to expansion

Engineering Contradiction:

Improveabsorbent capacityVSAvoidbarrier leg cuff effectiveness

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The absorbent core is divided into multiple functional zones: a first absorbent zone with higher SAP content for bulk absorption, and a second absorbent zone with lower SAP content and higher cellulose content for structural support. This segmentation allows different regions to serve different functions, preventing sagging while maintaining high overall absorbency capacity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the absorbent core are given different material compositions. The first absorbent zone has higher SAP content for maximum absorbency, while the second absorbent zone has higher cellulose content for structural integrity and resistance to sagging. This local differentiation resolves the contradiction between absorbency and structural stability.

Inventive Principle:

Principle #3Local quality

2Reliability

If the barrier leg cuffs are designed to follow anatomical fold lines for better fit, then the leakage prevention is improved, but the manufacturing complexity increases

Engineering Contradiction:

Improveleakage preventionVSAvoidbarrier leg cuff design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The barrier leg cuffs are designed with curved configurations that follow the anatomical fold lines of the body rather than straight lines. This curvature allows the cuffs to conform to the body's contours and maintain effective sealing at the leg-torso junction, improving leakage prevention while the curvature itself is achieved through standard forming processes.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Quantity of substance

If the absorbent core expands when loaded with fluid, then the absorbency function is improved, but the barrier leg cuffs lose contact with the body and containment is reduced

Engineering Contradiction:

Improvefluid absorptionVSAvoidbarrier leg cuff contact stability

Core Design Contradiction:

Quantity of substanceVSStability of the object's composition

Solution Approach 1:

The absorbent core is segmented into zones with different SAP concentrations. The second absorbent zone with lower SAP content and higher cellulose content provides structural stability that resists expansion, thereby maintaining barrier leg cuff contact with the body even when the first absorbent zone is highly saturated with fluid.

Inventive Principle:

Principle #1Segmentation

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 leakage prevention by allowing the barrier leg cuffs to better conform to the body's contours, maintaining effective containment and reducing the risk of leakage, especially when the article is fully loaded with fluids.

Implementation Method 1

The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

At least one channel is positioned within a layer located between the topsheet and the backsheet, and longitudinally-extending within a portion of the front region and the crotch region, the at least one channel being substantially free of fibers and superabsorbent polymer

Methodology Applied

Scientific EffectFluid flow through channels:

Data Source

PatentUS20250205094A1Absorbent article with high absorbent material content

Publication Date: 2025.06.26 PROCTER & GAMBLE CO

AI summary

An absorbent article includes a longitudinal axis extending in a longitudinal direction of the article, a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core disposed between the topsheet and backsheet. The absorbent core includes a superabsorbent polymer. The article further includes an acquisition-distribution layer; and at least one channel positioned within a layer located between the topsheet and the backsheet, the at least one channel being substantially free of fibers and superabsorbent polymer. An indentation occurs in at least one of the topsheet and the backsheet that correspond to the at least one channels when the article is loaded with fluid.