Structured Fibrous Web for Fluid Management
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Solution Overview
Problem
Fluid acquisition layers in disposable absorbent articles face a trade-off between thickness for fluid handling and thinness for comfort, with existing materials struggling to maintain optimal caliper under compressive forces during handling and use, while also requiring enhanced fluid distribution capabilities.
Innovation Solution
A structured fibrous web with continuous, uncrimped spunbond thermoplastic fibers, thermally bonded to form a substrate with localized out-of-plane thickness and displaced fibers creating void volume for fluid acquisition and distribution, featuring a specific volume of at least 5 cm^3/g and permeability of at least 10,000 cm^2/(Pa·s), designed to withstand compressive forces and maintain performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the fluid acquisition layer thickness is increased to improve fluid handling capability, then fluid acquisition and distribution performance is improved, but the product bulkiness increases and comfort is reduced
Solution Approach 1:
The patent employs a highly porous nonwoven material structure with controlled void spaces and interconnected channels that enable superior fluid acquisition and distribution. The porosity and void volume allow the material to handle fluids effectively without requiring increased thickness, thus resolving the contradiction between fluid handling capability and layer thickness.
Solution Approach 2:
The patent modifies key material parameters including basis weight, porosity, void volume, and fiber arrangement to optimize fluid management performance. By changing these parameters within a thin layer, the material achieves high fluid acquisition and distribution capability without increasing thickness, thereby resolving the technical contradiction.
2Volume of moving object
If the nonwoven layer is compressed during handling and storage to reduce bulkiness, then product compactness is improved, but caliper maintenance and fluid management performance deteriorate
Solution Approach 1:
The patent incorporates compressible yet resilient material structures that can withstand compressive forces during handling and storage. The material's inherent elasticity and structural design allow it to temporarily compress for compact packaging while automatically recovering its original caliper and fluid management properties when deployed, thus protecting performance during the handling process.
Solution Approach 2:
The patent utilizes three-dimensional fiber arrangements and curved channel structures that provide structural resilience against compression. The non-linear fiber paths and void space geometry allow the material to deform under compression while maintaining its fundamental fluid management architecture, enabling compact storage without permanent damage to performance.
3Volume of moving object
If the acquisition layer is made thinner to improve comfort, then product thinness and comfort are improved, but fluid acquisition capacity is reduced
Solution Approach 1:
The patent uses highly porous materials with optimized void volume and interconnected pore structures that compensate for reduced thickness. The increased porosity and strategic void space distribution enable thin layers to acquire and distribute fluids effectively, maintaining fluid acquisition capacity despite reduced thickness.
Solution Approach 2:
The patent may employ composite nonwoven structures combining different fiber types, densities, or porosity levels within the thin layer. This composite approach allows the material to achieve high fluid acquisition capacity in a thin profile by leveraging the complementary properties of different material components.
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 structured fibrous web effectively balances fluid acquisition and distribution capabilities with comfort, maintaining caliper and fluid management performance under compressive forces, enhancing the functionality of disposable absorbent articles and similar products.
Implementation Method 1
continuous, uncrimped spunbond thermoplastic fibers, thermally bonded to form a substrate
Implementation Method 2
displaced fibers creating void volume for fluid acquisition
Implementation Method 3
permeability of at least 10,000 cm^2/(Pa·s)
Implementation Method 4
Material properties related to fluid distribution performance include wicking and permeability
Data Source
Figure 1
Figure 1A
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AI summary
The present invention is directed to a fluid permeable structured fibrous web comprising thermally stable, fibers that are thermally bonded together using heat producing a base substrate that is thermally stable. The base substrate is textured via mechanical treatment producing a structured fibrous web having an aged caliper of less than 1.5 mm, a vertical wicking height of at least 5 mm, a permeability of at least 10,000 cm2/(Pa-s) and a specific volume of at least 5 cm3/g. The structured fibrous web provides optimal fluid wicking and the fluid acquisition capabilities and is directed toward fluid management applications.