Variable-Bond Nonwoven Structure for Strength and Compression Resistance
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Solution Overview
Problem
Existing nonwoven materials face limitations in achieving desirable strength, formation, and compression resistance due to restricted fiber movement during post-processing, which weakens the created structures.
Innovation Solution
The method involves laying down fibers on a collection surface and forming localized densified areas, apertures, or three-dimensional elements before bonding, allowing for increased fiber-to-fiber contact and creating areas with varying bond densities through air-through bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fibers are bonded together before structure creation, then the nonwoven material has integrity and can be handled, but fiber movement is restricted and created structures are weaker
Solution Approach 1:
The patent applies preliminary action by creating the desired three-dimensional structures and fiber arrangements before bonding occurs. The collection surface is pre-formed with protrusions and recesses that guide fiber placement and create the target structure, allowing fibers to be positioned optimally before any bonding takes place. This ensures both structural integrity and strength are achieved simultaneously.
Solution Approach 2:
The patent implements local quality by having different regions of the nonwoven material with different bond densities. Areas with three-dimensional structures have higher fiber-to-fiber bond densities where fibers intersect and contact each other, while flat areas have lower bond densities. This localized variation in bonding characteristics optimizes both handling integrity and structural strength in different regions.
2Stability of the object's composition
If bonding is applied throughout the nonwoven material, then the material has uniform integrity, but created structures lack desired strength and compression resistance
Solution Approach 1:
The patent applies local quality by creating variable bond density zones within the nonwoven material. Three-dimensional structures have higher fiber-to-fiber bond densities with more fiber intersections and contacts, providing enhanced compression resistance. Flat areas have lower bond densities, maintaining uniform overall integrity while allowing localized strength enhancement where needed.
Solution Approach 2:
The patent segments the bonding characteristics into distinct zones: high-bond-density regions at three-dimensional structures and low-bond-density regions at flat areas. This segmentation allows different parts of the material to have optimized bonding characteristics for their specific functional requirements, improving both reliability and handling properties.
3Shape
If fiber movement is restricted during post-processing, then the nonwoven material maintains formation, but compression resistance and structural strength are reduced
Solution Approach 1:
The patent applies preliminary action by pre-forming the three-dimensional structures on the collection surface before fiber bonding. The protrusions and recesses are already in place to guide fiber placement, so fibers are positioned correctly without needing to move them during post-processing. This maintains formation integrity while enabling the structures to achieve desired strength through optimized fiber arrangement.
Solution Approach 2:
The patent creates local quality variations in fiber arrangement where three-dimensional structures have higher fiber density and more fiber-to-fiber contacts. This localized increase in fiber interaction provides enhanced compression resistance at structures while maintaining overall formation. The variable bond density naturally arises from the pre-formed structure geometry rather than requiring post-processing fiber movement.
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
This approach enhances the strength and stability of nonwoven materials by increasing fiber-to-fiber bonds in specific areas, resulting in better aperture formation and resistance to compression.
Implementation Method 1
The fibers are then air through, or otherwise, bonded to lock the fibers in the structures and non-structured areas in place. The air through bonding creates fiber to fiber bonds where the fibers intersect or touch each other in the nonwoven materials.
Data Source
AI summary
An air through bonded nonwoven material is provided. The air-through bonded nonwoven material comprises a plurality of fibers, a first plurality of areas formed in the fibers and having a first fiber to fiber bond density, and a second plurality of areas formed in the fibers and having a second, different fiber-to-fiber bond density. The first plurality of areas do not overlap with the second plurality of areas. The first fiber to fiber bond density is greater than the second fiber to fiber bond density. The first plurality of areas are substantially free of a film. The second plurality of areas are substantially free of a film.