Acquisition-Distribution Layer Design for Fluid-Absorbent Articles
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Solution Overview
Problem
Existing fluid-absorbent articles face challenges in achieving improved fluid acquisition, absorption capacity, and dryness while reducing the amount of superabsorbent polymer (SAP) usage without compromising performance, and they often require additional production steps and negatively impact sustainability.
Innovation Solution
A fluid-absorbent article design featuring a core with at least 60% non-surface postcrosslinked fluid-absorbent polymer particles and up to 40% fibrous material, an acquisition-distribution layer with 90% synthetic fibers, and a basis weight of at least 70 gsm, which enhances fluid distribution and absorption capacity with reduced SAP amounts, and includes optional tissue layers for improved sustainability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If the amount of superabsorbent polymer (SAP) is reduced, then sustainability and production complexity are improved, but fluid acquisition and absorption capacity deteriorate
Solution Approach 1:
The patent changes the key parameter of SAP particle permeability by selecting particles with high saline flow conductivity (SFC ≥ 20×10^-7 cm³s/g). This parameter change enables reduced SAP amounts while maintaining absorption capacity, as the highly permeable particles allow faster fluid penetration and distribution throughout the core layer.
Solution Approach 2:
The patent applies local quality by creating distinct functional zones: the acquisition-distribution layer (ADL) with specific synthetic fiber content (≥90%) and basis weight (≥70 gsm) handles fluid distribution, while the core layer with reduced SAP content (≤40% fibrous material) handles absorption. This spatial differentiation allows each zone to be optimized for its specific function.
2Reliability
If conventional ADL composition is used, then fluid distribution is achieved, but SAP amount increases and sustainability deteriorates
Solution Approach 1:
The ADL is designed with local quality by using ≥90% synthetic fibers (specifically polypropylene) with a basis weight of ≥70 gsm. This specific composition and structure create an optimized fluid distribution zone that works synergistically with the reduced-SAP core layer, enabling effective fluid management with minimal SAP content.
Solution Approach 2:
The patent uses composite materials by combining synthetic polypropylene fibers in the ADL with highly permeable SAP particles (SFC ≥ 20×10^-7 cm³s/g) in the core layer. This composite approach creates a multi-functional structure where each material contributes its specific properties: synthetic fibers provide structural integrity and distribution pathways, while permeable SAP particles provide absorption capacity with reduced quantity.
3Device complexity
If SAP amount is reduced, then production complexity and sustainability are improved, but dryness performance deteriorates
Solution Approach 1:
The patent changes the permeability parameter of SAP particles (SFC ≥ 20×10^-7 cm³s/g) to enable reduced SAP content while maintaining dryness. The high permeability ensures rapid fluid acquisition and distribution, preventing fluid pooling and maintaining surface dryness even with lower SAP amounts.
Solution Approach 2:
The patent optimizes the core layer composition by limiting fibrous material to ≤40% and using ≥60% non-surface postcrosslinked SAP particles. This local optimization in the core layer, combined with the specifically designed ADL, creates an efficient fluid management system that achieves dryness with reduced overall SAP content.
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 design achieves enhanced fluid acquisition and absorption capacity with reduced SAP usage, improving dryness and sustainability by optimizing fluid distribution and reducing production complexity.
Implementation Method 1
an acquisition-distribution layer (D) between (A) and (C) comprising at least 90% by weight of synthetic fibers and not more than 10% by weight of cellulose based fibers, based on the sum of synthetic fibers and cellulose based fibers, wherein the basis weight of the acquisition-distribution layer (D) is at least 70 gsm
Implementation Method 2
a fluid-absorbent core (C) between (A) and (B) comprising at least 60% by weight of non-surface postcrosslinked fluid-absorbent polymer particles and not more than 40% by weight of fibrous material
Implementation Method 3
the fluid-absorbent polymer particles have a saline flow conductivity (SFC) of less than 5×10−7 cm3s/g and an AUHL of less than 15 g/g
Data Source
AI summary
A fluid-absorbent article includes an upper liquid-pervious layer (A), a lower liquid-impervious layer (B), a fluid-absorbent core (C) between (A) and (B) including at least 60% by weight of non-surface postcrosslinked fluid-absorbent polymer particles and not more than 40% by weight of fibrous material, based on the sum of non-surface postcrosslinked fluid-absorbent polymer particles and fibrous material. An acquisition-distribution layer (D) between (A) and (C) includes at least 90% by weight of synthetic fibers and not more than 10% by weight of cellulose based fibers, based on the sum of synthetic fibers and cellulose based fibers. The basis weight of the acquisition-distribution layer (D) is at least 70 gsm. The fluid-absorbent polymer particles have a saline flow conductivity (SFC) of less than 5×10−7 cm3s/g and an AUHL of less than 15 g/g. Preferably the acquisition-distribution layer (D) is a non-woven web including a three dimensional network of fibers.