High-Core Bicomponent Nonwoven Structure for Wet Strength Retention
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Solution Overview
Problem
Nonwoven materials face challenges in maintaining structural integrity under compressive and tensile forces and when wetted, leading to reduced fluid absorption capacity over time.
Innovation Solution
Airlaid nonwoven materials comprising high core bicomponent fibers with a polyester core and polyethylene sheath, and a core-to-sheath ratio greater than 1:1, along with low core bicomponent fibers, enhance resilience and strength, maintaining structure under stress and wet conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nonwoven materials are made from synthetic and cellulose fibers for cost-effectiveness and disposability, then manufacturing cost is reduced, but structural integrity deteriorates when wetted or under mechanical forces
Solution Approach 1:
The patent employs bicomponent fibers combining polyester core and polyethylene sheath, creating a composite material structure where each component contributes specific properties. The polyester core provides strength and structural integrity, while the polyethylene sheath offers flexibility and bonding capability, resolving the contradiction between cost-effectiveness and structural strength
Solution Approach 2:
The patent applies different fiber compositions to different functional layers: the acquisition layer uses high core ratio bicomponent fibers (70-90% core) for strength and resiliency, while the distribution layer uses low core ratio bicomponent fibers (30-70% core) for flexibility and fluid distribution, optimizing each layer's local properties for its specific function
2Ease of operation
If nonwoven materials are pre-wetted for consumer convenience, then ease of operation is improved, but fibrous network integrity deteriorates due to fiber swelling and deformation
Solution Approach 1:
The patent modifies the fiber composition parameters by using high core ratio bicomponent fibers (70-90% core content) in the acquisition layer, which maintains structural stability when wetted. The polyester core resists swelling compared to natural fibers, and the polyethylene sheath prevents excessive deformation, allowing pre-wetting without compromising fibrous network integrity
Solution Approach 2:
The bicomponent fiber structure combines hydrophobic polyethylene sheath with hydrophilic polyester core, creating a composite that can be pre-wetted effectively while maintaining structural integrity. The sheath protects the core from excessive water absorption and swelling, enabling pre-wetted convenience without network collapse
3Productivity
If nonwoven materials are subjected to compressive and tensile forces during manufacturing, then productivity is improved, but material structure deteriorates due to collapse
Solution Approach 1:
The patent incorporates resiliency-enhancing features during the manufacturing process itself by using high core ratio bicomponent fibers that inherently resist compression. The polyester core's high melt point and structural stability allow the material to withstand compressive and tensile forces during manufacturing operations without collapsing, maintaining structure for subsequent processing steps
4Stability of the object's composition
If high core ratio bicomponent fibers are used to improve resiliency and strength, then structural stability is improved, but device complexity increases
Solution Approach 1:
The patent uses commercially available bicomponent fibers with standard polyester-polyethylene combinations, leveraging existing material science rather than creating novel complex materials. The core-sheath structure is a well-established composite technology that provides structural stability through a straightforward dual-component design, avoiding excessive complexity
Solution Approach 2:
The patent applies different core-to-sheath ratios to different layers based on local functional requirements: 70-90% core in the acquisition layer for strength and resiliency, and 30-70% core in the distribution layer for flexibility. This localized differentiation optimizes structural stability where needed while maintaining overall system simplicity
Data Source
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AI summary
Nonwoven materials having at least one layer comprising high core bicomponent fibers are provided. The nonwoven materials can have multiple layers and are suitable for use in a variety of applications, including in absorbent products. The nonwoven materials can have improved resiliency and strength and can retain their structure under wetted conditions and after tension and compression.