Cross-lapped Multilayer Fibrous Batt Z-Directional Strength
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Solution Overview
Problem
Existing fibrous batts face challenges in achieving high Z-directional strength, resistance to delamination, and maintaining flexibility and light weight, making them unsuitable for applications requiring multiple layers without compromising other desirable attributes.
Innovation Solution
A cross-lapped multilayered batt comprising carded staple fibers and continuous filament fibers, where the fibers are entangled in the Z-direction through a needle punching process, enhancing the structural integrity and preventing delamination, and can be molded into semi-rigid or rigid structures for specific applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If multiple layers of carded fibers are used to create a multilayered batt, then the batt can provide enhanced insulation and structural properties, but the layers are prone to delamination and lack Z-directional strength
Solution Approach 1:
The patent combines carded staple fibers with continuous filament fibers to create a composite nonwoven structure. The continuous filaments act as binding elements that extend through multiple carded fiber layers, mechanically anchoring them together. This composite approach provides Z-directional strength while preventing layer delamination, as the continuous filaments bridge across layer interfaces and resist separation forces.
Solution Approach 2:
The continuous filament fibers serve as intermediary elements between the carded staple fiber layers. These filaments are embedded within and extend through the carded layers, acting as a mediating structural component that transfers loads across layers and prevents direct separation. The intermediaries (continuous filaments) resolve the delamination issue by providing a bonding mechanism without requiring chemical adhesives.
2Strength
If the batt is designed to be strong and rigid through multiple layers, then structural integrity is improved, but flexibility and light weight are compromised
Solution Approach 1:
The patent uses a composite structure where lightweight carded staple fibers provide bulk and insulation, while sparse continuous filament layers provide structural reinforcement. This composite design achieves high structural integrity with minimal additional weight, as the continuous filaments are used efficiently to bond layers rather than creating dense, heavy structures. The result is a strong yet lightweight batt suitable for automotive applications.
Solution Approach 2:
The batt is segmented into multiple thin carded fiber layers bonded by continuous filaments, rather than using a single dense layer. This segmentation allows the structure to achieve rigidity through layer stacking while maintaining overall lightness, as each individual carded layer remains lightweight and the continuous filaments provide the necessary structural connection without adding excessive weight.
3Strength
If the batt is designed to be strong and rigid through multiple layers, then structural integrity is improved, but flexibility is compromised
Solution Approach 1:
The composite structure of carded layers bonded by continuous filaments creates a flexible rigid structure. The carded layers provide flexibility and conformability, while the continuous filaments provide structural integrity. This combination allows the batt to be strong enough for structural applications yet flexible enough to conform to complex automotive body shapes and provide vibration isolation.
Solution Approach 2:
The patent creates a dynamic structure where the continuous filament network allows controlled movement and flexing of the carded layers relative to each other. This dynamic configuration enables the batt to flex and conform under load while maintaining structural integrity, providing both rigidity and flexibility for automotive interior applications where vibration damping and shape adaptation are required.
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 significantly enhances Z-directional strength, dimensional stability, and flexibility, allowing the batt to be molded into desired shapes while preventing delamination, making it suitable for various applications such as thermal, vibrational, and acoustical insulation in vehicles and appliance compartments.
Implementation Method 1
The intermediate web may then undergo a needle punching process, so that at least some of the plurality of staple fibers and at least some of the plurality of continuous filament fibers of the plurality of layers are entangled with one another
Data Source
Figure 1A~1B
Figure 2A
Figure 2B~2D
AI summary
A cross-lapped multilayered batt, and a method of making the same is presented. The batt includes one or more layers of a carded web of staple fibers, and one or more continuous filament fiber layers. At least some of the staple fibers and, in some instances, some of the continuous filament fibers are mechanically entangled through a thickness of the batt. The method includes folding both the carded web and the continuous filament fiber layers together, and subjecting the folded layers to a needle-punching process to impart structural stability and enhance the Z-directional strength of the batt.