High-SAP Absorbent Core Structure for Wet Shape Stability
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Solution Overview
Problem
Conventional absorbent articles with high flexibility in the crotch region tend to lose shape and resiliency when wet, leading to increased risk of fluid leakage due to deformation under wearer movement.
Innovation Solution
An absorbent core structure comprising at least 80% superabsorbent polymers (SAP) enclosed in a core wrap with longitudinal channels and a core wrap bonded through adhesive, ensuring minimal deformation and leakage during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the absorbent core is made highly flexible to improve freedom of movement, then the wearer experiences improved comfort and mobility, but the core loses resiliency when wet and deforms under wearer movement, increasing the risk of fluid leakage
Solution Approach 1:
The absorbent core is divided into multiple segments or zones with different SAP concentrations and channel configurations. The crotch region contains channels and specific SAP distribution to maintain flexibility, while other regions have different properties to maintain overall structural resiliency when wet.
Solution Approach 2:
Different regions of the absorbent core have different properties: the crotch region is designed with specific channel patterns and SAP distribution to provide flexibility and comfort, while other regions are optimized for fluid absorption and structural stability. This local differentiation allows the core to be flexible where needed while maintaining overall resiliency.
2Quantity of substance
If the absorbent core uses a high content of superabsorbent polymers (at least 80% SAP) to improve fluid absorption capacity, then the core can absorb and retain larger quantities of exudates, but the core may deform and lose shape when compressed by wearer movement
Solution Approach 1:
Channels are pre-formed in the absorbent material before the product is used. These channels maintain the core's structural integrity and prevent deformation by creating a framework that resists compression, while still allowing the high SAP content to absorb fluids effectively.
Solution Approach 2:
The core wrap is designed as a flexible yet structurally supportive enclosure that contains the high SAP content. The wrap maintains the core's shape during wearer movement while allowing the SAP to expand and absorb fluids, preventing deformation despite the high polymer content.
3Reliability
If the core wrap is designed to enclose and immobilize the SAP to prevent leakage, then fluid retention improves, but the core may lose flexibility and comfort in the crotch region
Solution Approach 1:
The core wrap is segmented or features localized regions with different bonding characteristics. In the crotch region, the wrap has reduced bonding or specific channel configurations that allow flexibility and movement, while other regions have stronger bonding to maintain overall fluid containment and prevent leakage.
Solution Approach 2:
Different sections of the core wrap have different properties: the crotch region features specific bonding patterns, channel configurations, or material properties that provide flexibility and comfort, while other sections are designed for strong containment and leakage prevention. This local differentiation resolves the contradiction between flexibility and fluid retention.
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 core maintains shape and resiliency while absorbing fluids, reducing the risk of leakage by immobilizing SAP within the core wrap, thus providing improved fluid retention and wearer comfort.
Implementation Method 1
The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 2
a blend of comminuted wood pulp with superabsorbent polymers (SAP) in particulate form, also called absorbent gelling materials (AGM)
Implementation Method 3
the top side of the core wrap and the bottom side of the core wrap are bonded to each other through the channels
Data Source
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AI summary
An absorbent core (28) and an absorbent article (20) such as diaper comprising the core. The absorbent core comprises a core wrap (16, 16') enclosing an absorbent material (60), wherein the absorbent material comprises at least 80% of superabsorbent polymers ("SAP") by weight of the absorbent material. The absorbent core has a Relative Wet Caliper Increase (RWCI) after compression of less than 10% as measured by the Wet Caliper And Compression Force (WCACF) Test as described herein, and wherein the core wrap (16, 16') is at least partially sealed so that substantially no absorbent material leaks out of the core wrap while performing the WCACF Test.