Absorbent Core Glue Pattern for Backsheet Rupture Prevention

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Solution Overview

Problem

Current absorbent articles face issues with core-to-backsheet gluing patterns that lead to buckles, wrinkles, and urine stain visibility, as well as potential rupture of the backsheet due to uneven distribution of shearing forces during manufacturing and wear.

Innovation Solution

A core-to-backsheet gluing pattern using a combination of a first continuous glue applied between channels and a second discontinuous glue applied outside the channel areas, with the second glue covering larger areas to ensure secure attachment and distribute forces evenly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a discontinuous glue pattern is used to attach the absorbent core to the backsheet, then the formation of buckles and wrinkles is reduced, but the attachment strength and force distribution are insufficient leading to potential backsheet rupture

Engineering Contradiction:

Improvebacksheet smoothnessVSAvoidcore-to-backsheet attachment strength

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

The glue pattern is segmented into multiple discrete glue applications arranged in a specific pattern across the backsheet surface. This segmentation allows the backsheet to maintain its natural flexibility and avoid buckling while still providing sufficient attachment points to secure the absorbent core and distribute forces effectively.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the backsheet receive glue applications with varying characteristics. The glue pattern is strategically positioned to provide enhanced attachment in areas requiring stronger bonding while maintaining smoother regions in areas where flexibility is prioritized, optimizing both attachment strength and backsheet smoothness locally.

Inventive Principle:

Principle #3Local quality

2Ease of operation

If the absorbent core is attached to the backsheet in limited areas, then buckles and wrinkles are reduced, but uneven force distribution occurs leading to backsheet rupture

Engineering Contradiction:

Improvebacksheet flexibilityVSAvoidbacksheet rupture resistance

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The attachment system is segmented into multiple discrete glue applications distributed across the backsheet. This segmentation maintains backsheet flexibility by avoiding continuous rigid bonding while ensuring reliable attachment through strategically positioned glue points that distribute forces evenly across the structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The glue pattern is designed in advance to anticipate and cushion against the development of uneven forces during manufacturing and wear. By pre-positioning glue applications in specific locations, the system proactively distributes potential stress concentrations before they can lead to backsheet rupture.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of manufacture

If conventional gluing methods are used, then manufacturing simplicity is maintained, but urine stain visibility through the backsheet increases

Engineering Contradiction:

Improvegluing process simplicityVSAvoidurine stain visibility

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The glue pattern uses segmented, discrete applications rather than continuous coating. This approach maintains manufacturing simplicity by using standard gluing equipment while reducing urine stain visibility through the backsheet by preventing the formation of continuous glue lines that could create pathways for urine penetration.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The harmful continuous glue layer is extracted and replaced with discrete glue applications. This removal of the continuous bonding layer eliminates the primary pathway for urine to penetrate through the backsheet, thereby reducing stain visibility while maintaining adequate attachment functionality.

Inventive Principle:

Principle #2Taking out (Extraction)

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 gluing pattern enhances the anchoring of the absorbent core, prevents backsheet rupture, and improves the overall durability and performance of absorbent articles by distributing forces more evenly and providing a secure attachment along the full length of the core.

Implementation Method 1

The first glue and second glue are used to attach the absorbent core to the backsheet

Methodology Applied

Scientific EffectAdhesive bonding: Adhesive

Data Source

PatentUS20240033139A1Absorbent article with core-to-backsheet glue pattern comprising two glues

Publication Date: 2024.02.01 PROCTER & GAMBLE CO

AI summary

An absorbent article comprises a topsheet on the wearer-facing side, a backsheet on the garment-facing side, and an absorbent core positioned between the topsheet and the backsheet. The absorbent core comprises an absorbent material comprising a superabsorbent polymer, a core wrap enclosing the absorbent material, and a first channel disposed on one side of the longitudinal axis and a second channel disposed on the other side of the longitudinal axis.