Absorbent Core Layering for SAP Immobilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current absorbent cores for personal hygiene products face challenges in maintaining structural integrity and fluid handling performance, particularly in wet conditions, and struggle with efficient distribution and immobilization of superabsorbent polymers, leading to increased material costs and production inefficiencies.
Innovation Solution
The absorbent core design comprises a first layer with superabsorbent polymer particles covered by a fibrous thermoplastic adhesive material and a second layer with a mixture of superabsorbent particles and cellulosic fibers, allowing for improved immobilization and distribution of absorbent materials, enhanced fluid handling, and reduced material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the concentration of superabsorbent polymer particles is increased to cover higher user loadings, then the absorbent capacity is improved, but the structural integrity deteriorates and the core becomes more prone to breaking or bursting
Solution Approach 1:
The absorbent core is divided into multiple layers with different compositions. The first layer contains SAP particles embedded in a matrix of cellulose fibers and thermoplastic adhesive, while the second layer contains SAP particles mixed with cellulose fibers. This segmentation allows each layer to contribute differently to both absorbency and structural integrity, preventing the core from breaking under load.
Solution Approach 2:
The patent uses composite materials combining superabsorbent polymer particles with cellulose fibers and thermoplastic adhesive materials. This composite structure allows the SAP particles to provide absorbency while the cellulose fibers and thermoplastic adhesive provide structural support, preventing core breakdown even at high SAP concentrations.
2Productivity
If the production speed is increased to improve productivity, then the manufacturing efficiency is improved, but the precision of superabsorbent polymer distribution deteriorates
Solution Approach 1:
The absorbent core is divided into multiple layers with different compositions. The first layer contains SAP particles embedded in a matrix of cellulose fibers and thermoplastic adhesive, while the second layer contains SAP particles mixed with cellulose fibers. This segmentation allows each layer to contribute differently to both absorbency and structural integrity, preventing the core from breaking under load.
Solution Approach 2:
The patent changes the physical and chemical parameters of the absorbent core, including the use of thermoplastic adhesive materials and the specific composition ratios of cellulose fibers to SAP particles. These parameter changes enable the core to maintain its shape and SAP distribution even at high production speeds, overcoming the limitation of precision loss.
3Quantity of substance
If the amount of pulp or cellulose fiber is increased to increase capacity, then the absorbent capacity is improved, but the cost and core thickness increase
Solution Approach 1:
The patent uses composite materials combining superabsorbent polymer particles with cellulose fibers and thermoplastic adhesive materials. This composite structure allows the SAP particles to provide absorbency while the cellulose fibers and thermoplastic adhesive provide structural support, preventing core breakdown even at high SAP concentrations.
Solution Approach 2:
The patent changes the physical and chemical parameters of the absorbent core, including the use of thermoplastic adhesive materials and the specific composition ratios of cellulose fibers to SAP particles. These parameter changes enable the core to maintain its shape and SAP distribution even at high production speeds, overcoming the limitation of precision loss.
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 enhances the absorbent core's ability to maintain structural integrity and improve fluid handling performance, reducing rewet and increasing acquisition speed while allowing for cost-effective production and flexibility in material formulation.
Implementation Method 1
a fibrous layer of thermoplastic adhesive material covering the first superabsorbent polymer particles
Implementation Method 2
The absorbent core's function is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 3
superabsorbent polymer particles (herein 'SAP'), also called absorbent gelling materials (AGM)
Data Source
AI summary
An absorbent core for use in an absorbent article, the absorbent core including a first absorbent layer comprising a first substrate, a layer of first superabsorbent polymer particles deposited on the first substrate on a deposition area and a fibrous layer of thermoplastic adhesive material covering the layer of first superabsorbent polymer particles, and a second absorbent layer comprising a second substrate and a mixed layer comprising a mixture of second superabsorbent particles and cellulosic fibers deposited on the second substrate. The first and second absorbent layers are combined together such that at least a portion of the fibrous thermoplastic adhesive material of the first absorbent layer contacts at least a portion of the mixed layer of the second absorbent layer.