Patterned Absorbent Core for Hygiene Product Fluid Management

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Solution Overview

Problem

Current absorbent cores for personal hygiene products, such as baby diapers and adult incontinence products, face challenges in improving wearing comfort, production speed, and reducing raw material usage while maintaining optimal fluid management properties.

Innovation Solution

A substantially planar absorbent core is developed, encased in a core wrap, with a pattern of discrete absorbent material areas comprising dot-shaped and transversally-orientated or longitudinally-orientated areas, primarily using superabsorbent polymers, and optionally channel-forming areas to enhance fluid distribution and core flexibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If traditional absorbent cores use a blend of cellulose fibers and superabsorbent polymers, then absorbency capacity is achieved, but production speed and wearing comfort are limited

Engineering Contradiction:

Improveproduction speedVSAvoidabsorbency capacity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The absorbent core is divided into discrete absorbent material areas separated by non-absorbent zones, creating a patterned structure that enables faster production while maintaining absorbency through strategic placement of absorbent regions

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Cellulose fibers are extracted and removed from the absorbent core formulation, leaving only superabsorbent polymers as the absorbent material, which allows for increased production speed while maintaining or improving absorbency performance

Inventive Principle:

Principle #2Taking out (Extraction)

2Loss of substance

If absorbent material is continuously distributed across the core, then absorbency is maximized, but raw material usage increases

Engineering Contradiction:

Improveraw material usageVSAvoidfluid management properties

Core Design Contradiction:

Loss of substanceVSReliability

Solution Approach 1:

Absorbent material is concentrated in specific local areas (dot-shaped, transversally-orientated, or longitudinally-orientated regions) rather than uniformly distributed, reducing overall material usage while maintaining effective fluid management through strategic positioning of absorbent zones

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The continuous distribution of absorbent material is segmented into discrete areas separated by non-absorbent zones, creating a patterned structure that reduces raw material consumption while preserving fluid management capabilities through optimized spatial arrangement

Inventive Principle:

Principle #1Segmentation

3Productivity

If the absorbent core uses discrete absorbent material areas, then production speed increases, but fluid distribution may be compromised

Engineering Contradiction:

Improveproduction speedVSAvoidfluid distribution

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The discrete absorbent material areas are designed to dynamically respond to fluid presence, with the absorbent regions expanding and activating based on fluid distribution patterns, ensuring effective fluid management while maintaining the production speed benefits of the patterned structure

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

Different regions of the absorbent core have specialized local properties - dot-shaped areas for localized absorption, transversally-orientated areas for lateral fluid distribution, and longitudinally-orientated areas for longitudinal fluid management, collectively ensuring effective fluid distribution despite the discrete nature of the absorbent material

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

The solution provides improved absorbency, reduced material usage, increased production speed, and enhanced wearing comfort by optimizing the distribution and retention of fluid within the absorbent core, while maintaining effective fluid management.

Implementation Method 1

The absorbent core should be able to absorb and retain the exudates for a prolonged amount of time

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

the absorbent structure absorb a fluid. WO2012/170778 (Rosati et al., see also WO2012/170779, WO2012/170781 and WO2012/170808) discloses absorbent structures that comprise superabsorbent polymers, optionally a cellulosic material, and at least a pair of substantially longitudinally extending absorbent material free zones that can form channels as the absorbent structure absorb a fluid

Methodology Applied

Scientific EffectSwelling:

Data Source

PatentUS10052242B2Absorbent core with absorbent material pattern

Publication Date: 2018.08.21 PROCTER & GAMBLE CO

AI summary

A substantially planar absorbent core (28) extending in a transversal direction (x) and a longitudinal direction (y), comprising a core wrap (16, 16′) enclosing an absorbent material (60), wherein the absorbent material is substantially free of cellulose fibers and forms a pattern of discrete absorbent material areas. The pattern comprises dot-shaped areas (751) and at least one of transversally-orientated areas (752) or longitudinally-orientated areas (754). The absorbent core may also comprise a pair of channel-forming areas (26).