Absorbent Structure Stabilizer for High Superabsorbent Polymer Integrity
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Solution Overview
Problem
Absorbent composites with high levels of superabsorbent polymer face integrity issues due to insufficient fiber to contain and restrict the mobility and migration of superabsorbent material, leading to problems in manufacturing and product performance, such as sagging and drooping, and increased risk of gel on skin.
Innovation Solution
A method of forming an absorbent structure that includes providing a core forming surface, forming an absorbent composite with a high percentage of superabsorbent material, and applying an aqueous composite stabilizer containing a stabilizing component and water, which absorbs into the composite without drying, providing integrity and reducing the need for embossing or debulking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high levels of superabsorbent polymer are used in absorbent composites, then absorbency is improved, but composite integrity deteriorates due to insufficient fiber to contain and restrict the mobility and migration of superabsorbent material
Solution Approach 1:
An aqueous composite stabilizer containing a stabilizing component is applied to the absorbent composite. The stabilizing component acts as an intermediary substance that binds the superabsorbent polymer particles to the fiber matrix, preventing migration and maintaining composite integrity while preserving high absorbency. The stabilizer forms a bonding network that holds the high levels of superabsorbent material in place without requiring excessive fiber content.
2Stability of the object's composition
If embossing or debulking is used to improve integrity at higher superabsorbent material levels, then composite integrity is improved, but fluid properties are compromised due to damage to the superabsorbent
Solution Approach 1:
The mechanical processes of embossing and debulking are replaced with a chemical/biochemical approach using an aqueous composite stabilizer. Instead of applying physical force that damages the superabsorbent polymer structure, the stabilizing component chemically bonds to the superabsorbent material and fiber matrix, providing integrity through molecular adhesion rather than mechanical compression. This substitution preserves the physical integrity and fluid absorption properties of the superabsorbent polymer.
3Quantity of substance
If more mobile superabsorbent material is used, then absorbency is improved, but gel on skin becomes an increased problem
Solution Approach 1:
The aqueous composite stabilizer acts as a barrier intermediary between the mobile superabsorbent polymer and the skin. The stabilizing component forms a bonding network that restricts the mobility of superabsorbent particles, preventing them from migrating to the skin surface where they could form gel. This allows the composite to maintain high absorbency with mobile superabsorbent material while the stabilizer prevents the harmful gel-on-skin effect by controlling particle movement.
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 achieves a soft, high-integrity absorbent structure with reduced bulk, eliminating the need for drying steps, enhancing manufacturing efficiency, and minimizing gel-on-skin issues while maintaining absorbency and product comfort.
Implementation Method 1
The superabsorbent in the absorbent composite absorbs the water from the aqueous composite stabilizer
Data Source
AI summary
A liquid absorbent structure is made by dry laying a fibrous web having incorporated therein a superabsorbent material, and applying an aqueous composite stabilizer to at least one surface of the web. The aqueous composite stabilizer imparts integrity to the resulting structure without substantially impairing the effectiveness of the superabsorbent material to absorb liquid while forming the absorbent structure without removing the water from aqueous composite stabilizer or drying out the absorbent structure. The absorbent composite absorbs the water from the aqueous composite stabilizer. The absorbent composite comprises about 70% by weight of a superabsorbent material.