Absorbent Core Channels and Printed Signals

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Solution Overview

Problem

Absorbent core structures with reduced cellulose fiber levels in disposable diapers can become stiffer when loaded with bodily fluids, affecting liquid transport and overall performance, while traditional methods to enhance absorbency often compromise flexibility and appearance.

Innovation Solution

Incorporating permanent channels within the absorbent core that are free of superabsorbent polymer particles, combined with adhesive to maintain channel integrity, which improves liquid transport and absorbency without increasing material usage, and using printed signals to communicate channel presence for aesthetic appeal.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If cellulose fibres are reduced or eliminated from the absorbent core structure to make it thinner, then the thickness is reduced, but the stiffness increases when partially or fully loaded with bodily fluids

Engineering Contradiction:

Improvethickness of absorbent coreVSAvoidstiffness of absorbent core

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The patent introduces permanent channels (porous structures) within the absorbent core that are free of superabsorbent polymer particles. These channels allow liquid to be transported more efficiently through the core, preventing the buildup of stiffness that occurs when absorbent material becomes saturated. The porous structure maintains flexibility by providing pathways for fluid movement even when the surrounding absorbent material is loaded.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The absorbent core is segmented into regions with and without superabsorbent polymer particles, creating distinct functional zones. The channels divide the core structure into separate pathways, allowing different regions to perform different functions - some areas absorb and retain fluid while others transport it, preventing uniform stiffening throughout the entire core structure.

Inventive Principle:

Principle #1Segmentation

2Quantity of substance

If superabsorbent polymer material is used to increase absorbency, then the absorbency is improved, but the flexibility is compromised when the material is loaded with bodily fluids

Engineering Contradiction:

Improveabsorbency capacityVSAvoidflexibility of absorbent core

Core Design Contradiction:

Quantity of substanceVSAdaptability or versatility

Solution Approach 1:

Permanent channels create porous pathways through the absorbent core that remain open even when superabsorbent polymer material is loaded with fluid. These channels allow the core to maintain flexibility by providing spaces that do not expand and stiffen, enabling the structure to adapt and flex while still containing high-capacity absorbent material.

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

Superabsorbent polymer particles are extracted or removed from specific regions to create permanent channels. By taking out the absorbent material from these channel regions, the patent creates flexible pathways that prevent overall stiffening of the core, while the remaining absorbent material in other regions maintains the necessary absorbency capacity.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If channels are created in the absorbent core to improve liquid transport, then the liquid transport efficiency is improved, but the structural integrity may be compromised

Engineering Contradiction:

Improveliquid transport efficiencyVSAvoidstructural integrity of absorbent core

Core Design Contradiction:

ProductivityVSStrength

Solution Approach 1:

The permanent channels are formed and stabilized before the absorbent core is fully loaded with bodily fluids. Adhesive is applied to immobilize the channels and surrounding absorbent material in advance, creating a pre-stabilized structure that maintains its integrity during use. This preliminary stabilization prevents structural collapse or deformation when the core becomes saturated with fluid.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Adhesive acts as an intermediary substance that binds the channels and surrounding absorbent material together, transferring and distributing mechanical stresses throughout the structure. This adhesive network maintains structural integrity by connecting different regions of the core, preventing the channels from compromising the overall strength of the absorbent core.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 enhances absorbency and flexibility while maintaining performance, reducing the risk of leakage and saturation, and provides visual cues to caregivers about the absorbent core's functionality through printed graphics and adhesive patterns.

Implementation Method 1

The absorbent core/structure typically includes superabsorbent polymer material, such as hydrogel-forming polymer material

Methodology Applied

Scientific EffectCapillary action: Capillary Action

Implementation Method 2

This superabsorbent polymer material ensures that large amounts of bodily fluids, e.g. urine, can be absorbed by the absorbent article

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS10449097B2Absorbent articles with channels and signals

Publication Date: 2019.10.22 PROCTER & GAMBLE CO

AI summary

Absorbent articles herein may provide a topsheet, a backsheet, an absorbent core disposed between the topsheet and the backsheet. The absorbent core may comprise at least one channel having a shape. The backsheet graphics may substantially match the shape.