Flex Bond Channel Absorbent Core for Body-Conforming Leakage Control
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Solution Overview
Problem
Absorbent articles with channels formed by high compressive force to create bending lines become stiff, hindering close conformity to the body, leading to potential leakage.
Innovation Solution
An absorbent core structure with a flex bond channel region sandwiched between two nonwoven layers that can plastically deform without high densification, allowing flexibility in both longitudinal and lateral directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If high compression force is applied to create channels in traditional cellulose based absorbent core structures, then channel formation and preferential bending location are achieved, but stiffness increases and the ability to conform to the wearer's body is hindered
Solution Approach 1:
The patent changes the physical state and properties of the absorbent core material by using a foam-based structure instead of traditional cellulose. The foam material allows channel formation through compression to a lower density range (0.03-0.15 g/cm³) compared to traditional densification, maintaining flexibility while creating defined channels for fluid management and preferential bending locations.
Solution Approach 2:
The invention uses a composite structure combining foam material with cellulosic fibers and superabsorbent particles. This composite approach allows the foam to provide structural flexibility and channel formation, while the cellulosic fibers and superabsorbent particles maintain absorbent functionality, resolving the contradiction between channel definition and overall flexibility.
2Shape
If high compression force is applied to create channels, then channel structure is established, but the absorbent article cannot bend in longitudinal and lateral directions, reducing body conformity
Solution Approach 1:
The patent fundamentally changes the material parameter from traditional cellulose to foam-based material, which has inherently lower stiffness and higher elasticity. This allows the absorbent article to maintain defined channel structures while simultaneously achieving superior adaptability to body contours in both longitudinal and lateral directions through the foam's inherent flexibility.
Solution Approach 2:
The foam-based absorbent core structure acts as a flexible matrix that can deform and conform to body shapes. The foam cells provide structural definition for channels while the overall foam structure remains flexible enough to adapt to the wearer's body movements and contours, enabling multi-directional bending capability.
3Shape
If traditional embossing channels are used, then preferential bending lines are created, but the article becomes stiff and leakage may occur due to poor fit
Solution Approach 1:
By changing from traditional cellulose material to foam-based material with controlled density (0.03-0.15 g/cm³), the patent achieves preferential bending lines through moderate compression rather than high densification. This maintains the article's flexibility and body conformity, ensuring reliable fit and leakage prevention while still creating defined channels for fluid management.
Solution Approach 2:
The composite of foam material with cellulosic fibers and superabsorbent particles creates a structure where the foam provides flexibility and channel definition, while the fiber-particle matrix ensures absorbent performance and leak protection. This combination resolves the contradiction between creating preferential bending lines and maintaining reliability for leakage prevention.
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 absorbent article conforms closely to the body, reducing leakage by forming flexible bending lines that accommodate bodily movements without losing structural integrity.
Implementation Method 1
nonwoven layers that can plastically deform to form a flex bond channel region
Implementation Method 2
an inner core layer disposed between the upper nonwoven layer and the lower nonwoven layer, wherein the inner core layer comprises cellulosic fibers and superabsorbent particles
Implementation Method 3
superabsorbent particles
Data Source
AI summary
A disposable absorbent article having a front end region, a back end region, and a middle region disposed between the front and back end regions. The absorbent article includes a topsheet; a backsheet; an absorbent core structure disposed between the topsheet and backsheet; and a flex bond channel region formed in at least the middle region. The absorbent core structure includes an upper nonwoven layer having polymer fibers; a lower nonwoven layer having polymer fibers; and an inner core layer disposed between the upper and lower nonwoven layers. The flex bond channel region has a dry channel depth of at least 1.0 mm and a channel width of from about 1.0 mm to about 3.0 mm. The flex bond channel region has a CD Bending Resistance Index of from about 1.1 to about 3.0, and a Dry MD Bending Resistance of less than about 0.04 N/mm.