Stabilized Absorbent Composite With Bonded Holes
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Solution Overview
Problem
Conventional absorbent composites in disposable products like diapers and incontinence pads suffer from structural breakdowns and superabsorbent particle loss, leading to discomfort and reduced performance, despite attempts to prevent these issues through densification, adhesives, and other binding methods.
Innovation Solution
A stabilized absorbent composite design featuring a unitary absorbent core with holes and bond points between two sheets, where the bond points are devoid of absorbent material, providing a uniform density and minimizing structural breakdowns and superabsorbent losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional absorbent composites are made with superabsorbent particles dispersed in fibrous materials, then absorption capacity is improved, but structural breakdown and particle loss occur during use
Solution Approach 1:
The absorbent core is divided into multiple discrete pockets or chambers that contain superabsorbent particles. Each pocket is separated by partition walls, preventing particle migration between regions and reducing overall structural breakdown while maintaining high absorption capacity within each compartment.
Solution Approach 2:
A binder or adhesive material is introduced as an intermediary substance between the superabsorbent particles and the fibrous matrix. This binder holds particles in place within the structure, preventing particle loss and structural breakdown during use while allowing the composite to maintain its absorption functionality.
2Reliability
If densification of cellulosic fluff is applied to prevent structural breakdown, then structural stability is improved, but absorption capacity and uniformity deteriorate
Solution Approach 1:
Different regions of the absorbent composite are assigned different densities and compositions. The areas containing superabsorbent particles maintain higher porosity and lower density for optimal absorption, while structural reinforcement elements or binder-rich regions provide localized structural stability without compromising overall absorption capacity.
3Reliability
If adhesives or binding agents are added to stabilize absorbent material, then structural stability is improved, but material purity and potential skin irritation increase
Solution Approach 1:
The absorbent composite is designed as a disposable product where minimal, biodegradable binders are used. The short service life of the product allows for the use of simple binding agents that provide sufficient structural stability during use but can be safely discarded afterward, reducing the need for complex, potentially irritating adhesive systems.
4Quantity of substance
If superabsorbent material is increased as percentage of total absorbent material, then absorption capacity is improved, but gel-on-skin and particle loss worsen
Solution Approach 1:
High concentrations of superabsorbent particles are confined within discrete pockets or encapsulated structures. This segmentation prevents the particles from migrating to the surface and causing gel-on-skin effects, while still allowing each pocket to achieve high absorption capacity through concentrated superabsorbent material.
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 effectively reduces structural breakdowns and superabsorbent particle migration, enhancing the stability and performance of absorbent products by maintaining a uniform density and ensuring bond points are securely registered within the absorbent core holes.
Implementation Method 1
The first sheet and the second sheet may be made of tissue and may be joined together at the bond points by adhesive
Implementation Method 2
a unitary absorbent core having a plurality of holes there through
Data Source
AI summary
An absorbent article includes a liquid pervious liner, a liquid impervious back sheet, and an absorbent composite located between the liner and the back sheet. The absorbent composite includes a first sheet, a second sheet, and a unitary absorbent core. The unitary absorbent core has a plurality of holes there through, wherein each hole has an area less than 200 mm2. The unitary absorbent core has a uniform density and is positioned between the first sheet and the second sheet. The first sheet is directly joined with the second sheet at a plurality of bond points. The bond points are located within the holes and are substantially devoid of absorbent material.