Pulpless Absorbent Core Forming with Localized SAP Concentration
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Solution Overview
Problem
Existing absorbent cores in products like diapers and incontinence products contain pulp fluff, which increases bulk while providing absorbency, leading to a desire for pulpless absorbent cores with high absorbent capacity but reduced bulk.
Innovation Solution
A method for forming pulpless absorbent cores using a foraminous forming surface with pressure differential, applying adhesives and particulate material, and depositing a matrix of material with a higher concentration of superabsorbent material in the center region to enhance absorbency without the bulk of pulp fluff.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pulp fluff is included in absorbent cores to provide absorbency, then absorbent capacity is improved, but bulk increases
Solution Approach 1:
The patent extracts and removes pulp fluff from the absorbent core, retaining only the essential particulate absorbent material (superabsorbent particles) that provides absorbency. This extraction eliminates the bulk-contributing pulp fluff while preserving the core absorbent function through the superabsorbent particles alone.
Solution Approach 2:
The patent applies local quality by creating a concentrated core region with high superabsorbent particle density where absorbency is most needed, rather than uniformly distributing pulp fluff throughout. The particulate material is strategically positioned to provide localized absorbent capacity without the diffuse bulk of pulp fluff.
2Stability of the object's composition
If pulp fluff is used to stabilize particulate absorbent material, then material stability is improved, but bulk increases
Solution Approach 1:
The patent extracts the stabilization function from pulp fluff and assigns it to a synthetic adhesive material. The adhesive is applied to bond the superabsorbent particles to the carrier sheet, providing structural stability without the bulk of pulp fluff.
Solution Approach 2:
The patent changes the physical and chemical parameters of the bonding mechanism by replacing natural pulp fluff with a controlled adhesive application system. The adhesive provides precise, localized bonding with controlled strength and minimal volume, unlike the diffuse structural support of pulp fluff.
3Quantity of substance
If a matrix of material with higher concentration of superabsorbent material is deposited in the center region, then absorbent capacity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by depositing a matrix of material with higher concentration of superabsorbent particles specifically in the center region of the absorbent core, where absorbency is most needed. This localized concentration strategy improves overall absorbent capacity while the automated deposition system manages the manufacturing complexity.
Solution Approach 2:
The patent segments the particulate material deposition into different regions with different concentrations - a higher concentration matrix in the center region and lower concentration at the edges. This segmentation optimizes absorbent capacity distribution and can be managed through controlled material delivery systems.
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 method results in absorbent cores with high absorbent capacity and reduced thickness, effectively addressing the need for products with improved absorbency and reduced bulk.
Implementation Method 1
creating a pressure differential across the foraminous forming surface
Implementation Method 2
applying a first adhesive onto the base carrier sheet
Implementation Method 3
The particulate absorbent material has a higher absorbent capacity than the pulp fluff
Data Source
AI summary
Pulpless absorbent cores and methods of manufacture are disclosed. A method of forming an absorbent core comprises moving a forming surface in a machine direction, creating a pressure differential across the forming surface, advancing a base carrier sheet on the forming surface in the machine direction, depositing a matrix of a first adhesive and a first quantity of superabsorbent material onto the base carrier sheet wherein the first adhesive and the first quantity of superabsorbent material mix prior to deposition onto the base carrier sheet, and applying a first quantity of cellulose fibers onto the deposited matrix of the first adhesive and the first quantity of superabsorbent material.