Fluff Pulp Composition for Thin High-SAP Absorbent Cores
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Solution Overview
Problem
Existing fluff pulp technologies face challenges in producing a thin, high SAP-loaded core with improved SAP retention, shred quality, and reduced shred energy, while maintaining flexibility and preventing fiber-fiber bonding.
Innovation Solution
A process involving a mixture of softwood and hardwood fibers, with 3 to 35% hardwood fibers by weight, is used to create a fluff pulp that is then dried and optionally pressed, allowing for the incorporation of superabsorbent polymers to enhance SAP retention and core properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fluff pulp is made with softwood fibers only, then core strength is maintained, but core thickness increases and SAP retention decreases
Solution Approach 1:
The patent changes the fiber composition parameter by introducing hardwood fibers (3-35% of total weight) to softwood fibers. This parameter change enables the core to achieve both reduced thickness and improved SAP retention, as hardwood fibers provide better SAP binding properties while maintaining structural integrity.
Solution Approach 2:
The patent creates a composite fluff pulp material combining softwood and hardwood fibers in specific proportions. This composite structure leverages the complementary properties of both fiber types: softwood provides bulk and strength, while hardwood enhances SAP retention and reduces required core thickness.
2Reliability
If fluff pulp is made with hardwood fibers, then SAP retention improves and core thickness reduces, but shred energy increases
Solution Approach 1:
The patent optimizes the hardwood fiber content parameter to a specific range (3-35% by weight). This controlled parameter change achieves improved SAP retention while limiting shred energy increase, as excessive hardwood content would require excessive energy for shredding.
Solution Approach 2:
The patent applies different fiber types to different functional requirements: softwood fibers (65-97% weight) provide the bulk structure requiring less shred energy, while hardwood fibers (3-35% weight) are strategically included to provide SAP retention properties where needed.
3Adaptability or versatility
If fluff pulp is made with hardwood fibers, then core flexibility improves, but fiber-fiber bonding increases
Solution Approach 1:
The patent uses hardwood fibers locally to provide flexibility and SAP retention properties, while softwood fibers provide the bulk structural framework. This localized application of different fiber properties achieves flexibility without excessive fiber-fiber bonding throughout the entire core structure.
Solution Approach 2:
The patent controls the hardwood fiber content parameter within 3-35% by weight to achieve adequate flexibility while preventing excessive fiber-fiber bonding. This parameter optimization ensures the core can change shape with the body without creating too many bonding sites.
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 process results in a thin, flexible core with improved SAP retention and reduced shred energy, maintaining high SAP content and shred quality, while allowing the core to change shape with the body.
Implementation Method 1
The fluff pulp structure provides capillary channels that draw and retain SAP particles through capillary action
Implementation Method 2
The fluff pulp fibers adhere to SAP particles through adhesion forces, improving SAP retention
Implementation Method 3
drying and optionally pressing the web, to form the fluff pulp
Data Source
AI summary
A fluff pulp is provided, which comprises softwood fibers; and 3 to 35% by weight of hardwood fibers. A fluff is also provided, which comprises the fiberized or shredded fluff pulp. A core is also provided, which comprises the fluff and at least an SAP. Processes for making and using the fluff pulp, fluff, and core are provided, and products made thereby.