Absorbent Core Channel Bonding for Tape Reliability

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Solution Overview

Problem

Absorbent articles with front channels close to the front edge can cause stress on the landing zone, leading to accidental unfastening of tapes due to swelling absorbent material, and fail to maintain adequate longitudinal stiffness.

Innovation Solution

The absorbent core features crotch channels with higher bond strength and front channels with weaker or no bonds, allowing the absorbent material to delaminate and reduce stress on the landing zone, while maintaining fluid distribution efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If front channels are placed close to the front edge of the absorbent article, then fluid distribution efficiency is improved and core protrusion is reduced, but stress on the landing zone increases causing tape unfastening

Engineering Contradiction:

Improvefluid distribution efficiencyVSAvoidtape fastening reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies different bond strengths to different regions of the absorbent core. The front region (where the front channel is located) has a first bond strength between the first absorbent core layer and second absorbent core layer, while the crotch region has a second bond strength that is higher than the first bond strength. This local differentiation allows the front channel to effectively distribute fluid and reduce core protrusion while preventing excessive stress on the landing zone that would cause tape unfastening.

Inventive Principle:

Principle #3Local quality

2Strength

If front channels are placed close to the front edge to maintain longitudinal stiffness, then structural integrity is improved, but stress concentration on the landing zone causes accidental tape release

Engineering Contradiction:

Improvelongitudinal stiffnessVSAvoidstress concentration on landing zone

Core Design Contradiction:

StrengthVSObject-generated harmful factors

Solution Approach 1:

The patent implements local quality by establishing different bond strengths in different regions. The front region has a first bond strength that provides adequate longitudinal stiffness, while the crotch region has a higher second bond strength that prevents stress concentration on the landing zone. This spatial variation in bond strength resolves the contradiction between maintaining structural integrity and avoiding harmful stress concentration.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The absorbent core is segmented into different regions with distinct bonding characteristics. The front region and crotch region are divided with different bond strengths between the first and second absorbent core layers. This segmentation allows each region to independently optimize its function: the front region maintains stiffness while the crotch region prevents stress concentration.

Inventive Principle:

Principle #1Segmentation

3Stability of the object's composition

If bonded channels are used to maintain channel structure, then channel permanence is improved, but absorbent material swelling is restricted

Engineering Contradiction:

Improvechannel structure stabilityVSAvoidabsorbent material swelling capacity

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent applies local quality by establishing different bond strengths in different regions of the absorbent core. In the front region, the first bond strength allows sufficient swelling capacity for the absorbent material while maintaining channel structure. In the crotch region, the higher second bond strength provides greater structural stability. This regional differentiation resolves the contradiction between channel permanence and swelling capacity.

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 significantly reduces the risk of tape unfastening and maintains longitudinal stiffness, ensuring effective fluid distribution and absorbency across a larger load range.

Implementation Method 1

The absorbent material layer comprises at least one crotch channel disposed predominantly in the crotch region of the article and at least one front channel disposed predominantly in the front region of the article

Methodology Applied

Scientific EffectAbsorption: Absorption (physical)

Implementation Method 2

when the absorbent material swells to relatively high load, this causes stress on the landing zone which may consequently accidently release the fastening tapes

Methodology Applied

Scientific EffectSwelling: Hydrogel

Implementation Method 3

These channels may help directing the fluid over a longer area of the absorbent core in a more efficient way than by diffusion

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentEP3944844B1Taped absorbent articles with front and crotch channels

Publication Date: 2023.08.23 PROCTER & GAMBLE CO

AI summary

A taped absorbent article 20 comprising a crotch channel 26 having a crotch channel bond strength, and a front channel 56 having no bond or a front channel bond strength which is weaker than the crotch channel bond strength. The front channel is at least partially superposed with the landing zone 44 on which the back ear tapes 42 can be releasably fastened. During use, the front channel can delaminate to relieve stress on the landing zone and avoid accidental detachment of the tapes 42.