Fibrous Nonwoven With Thickened Strands For Filter Pleatability
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Solution Overview
Problem
Existing nonwoven fabrics for filter media face challenges in achieving both high filtration efficiency and long service life while maintaining low pressure differential, which is crucial for vehicle air filters, especially in electric vehicles where energy efficiency and comfort are paramount, and current methods for increasing rigidity are either costly or require extensive processing.
Innovation Solution
A nonwoven fabric with strategically thickened fiber strands, where the diameter and crimping of the fibers are enhanced to create a more rigid structure, allowing for better pleatability and maintaining surface area without collapsing, achieved through a primary forming process that integrates different polymer sections with varying viscosities and structures, enabling efficient filtration and extended service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the filter medium is made more rigid to improve pleatability and prevent fold collapse, then the rigidity increases, but the manufacturing cost and processing complexity increase
Solution Approach 1:
The patent applies local quality by creating thickenings at specific locations along the fiber strands rather than uniformly increasing rigidity throughout the entire nonwoven fabric. These localized thickenings provide the necessary structural support for pleatability while minimizing overall material usage and manufacturing complexity.
Solution Approach 2:
The fiber strands are segmented into different sections with varying properties - thin sections for filtration and thickened sections for structural support. This segmentation allows the fabric to achieve rigidity where needed without compromising the ease of manufacture or increasing overall cost.
2Stability of the object's composition
If the filter medium is made more rigid to maintain surface area during pleating, then the pleatability improves, but the filtration efficiency may be compromised
Solution Approach 1:
The thickenings are strategically positioned to provide structural stability to the pleats while the thinner sections of the fiber strands maintain the filtration surface area. This local differentiation ensures that rigidity is applied only where structurally necessary, preserving filtration efficiency.
Solution Approach 2:
The nonwoven fabric combines different fiber properties within the same material - sections with high viscosity for structural support and sections with low viscosity for filtration. This composite approach within a single material allows simultaneous achievement of surface area stability and filtration efficiency.
3Strength
If bicomponent fibers are used to increase rigidity, then the tear resistance improves, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of using completely different materials (bicomponent fibers), the patent changes the physical parameters of a single polymer by controlling viscosity variations along the fiber strand. This achieves the desired rigidity and tear resistance through parameter modification rather than material complexity, simplifying the manufacturing process.
Solution Approach 2:
The fiber strand is segmented into regions with different viscosity characteristics during the forming process, creating thickenings that provide structural support. This segmentation is achieved through process control rather than using multiple materials, reducing manufacturing complexity.
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 solution results in a nonwoven fabric with improved rigidity, filtration efficiency, and extended service life, maintaining a large filter surface area and reducing pressure differential, thus enhancing air filtration performance and vehicle comfort while being economically and easily producible.
Implementation Method 1
integrates different polymer sections with varying viscosities and structures
Data Source
AI summary
The invention relates to a fibrous nonwoven, in particular for a filter medium, having a first layer, wherein at least one single-piece fiber strand of said first layer has a first fiber portion and a second fiber portion in the longitudinal direction, and wherein the fiber strand has a thickening substantially in said second fiber portion.