Crimped Fiber Bundle for Stable Spreading and Uniform Web Formation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fiber bundles struggle to achieve stable and high-speed spreading with uniform web formation and excellent handle properties, requiring trial-and-error methods for resin selection and processing conditions.
Innovation Solution
A fiber bundle with continuous fibers that form peaks and valleys in the width direction, characterized by a crimp characteristic value of at least 1.0, is developed, allowing for stable spreading and high fiber density packing, and utilizing thermoplastic conjugate fibers with different melting points for improved handle and productivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If continuous fibers are gathered to cohere with each other to provide high fiber density, then bundlability is improved, but spreading stability deteriorates
Solution Approach 1:
The fiber bundle is designed with non-uniform crimp distribution where crimps are concentrated in specific regions rather than uniformly distributed. This local variation in crimp characteristics creates zones of different packing densities, allowing the bundle to maintain high overall fiber density while having specific areas that facilitate stable spreading during processing.
Solution Approach 2:
The crimp structure is designed to be dynamic rather than static, where the crimps can deform and reconfigure during the spreading process. The crimped fibers are able to change their spatial arrangement from a compact gathered state to a more dispersed uniform web, enabling the system to adapt its structure in response to processing conditions while maintaining both high density and spreading stability.
2Quantity of substance
If crimped continuous fibers are used to provide high fiber density, then bundlability is improved, but web uniformity deteriorates
Solution Approach 1:
The fiber bundle is segmented into multiple crimped fiber groups with different crimp characteristics rather than using uniform crimped fibers throughout. This segmentation allows different regions of the bundle to contribute differently to the final web structure, with some regions providing density and others providing uniformity, thereby achieving both high fiber density and uniform web formation.
Solution Approach 2:
The invention utilizes variations in crimp parameters (crimp count, crimp amplitude, crimp wavelength) within the fiber bundle to achieve different local packing densities and spreading characteristics. By changing these crimp parameters rather than using uniform fibers, the bundle can maintain high overall density while producing uniform webs with consistent thickness and handle properties.
3Ease of manufacture
If traditional fiber bundles are used, then ease of manufacture is maintained, but productivity deteriorates
Solution Approach 1:
The fiber bundle is pre-formed with specific crimp characteristics and structural properties during manufacturing that facilitate rapid spreading during processing. The crimp structure is established in advance to create a configuration that naturally disperses fibers uniformly at high speeds, eliminating the need for complex real-time control systems and simplifying the spreading process while achieving high productivity.
4Manufacturing precision
If fiber bundles with stable spreading behavior are developed, then web uniformity is improved, but adaptability deteriorates
Solution Approach 1:
The fiber bundle is designed with universal crimp characteristics that enable it to perform multiple functions across different applications. The same crimped fiber structure provides both stable spreading for uniform web formation and the flexibility to adapt to various processing conditions and end-use requirements, making the fiber bundle versatile rather than specialized for a single application.
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 fiber bundle achieves uniform web formation with excellent handle properties and high productivity, suitable for various applications such as adsorbent products and wiping elements, through suitable draw and relaxation during the spreading process.
Implementation Method 1
crimped continuous fibers are gathered so as to cohere with each other... the continuous fibers have crimps that form peaks and valleys in the width direction of the fiber bundle
Implementation Method 2
thermoplastic conjugate fibers with different melting points for improved handle and productivity
Data Source
Figure 1~2
AI summary
A fiber bundle is provided that strikes an excellent balance among the properties and performance of the web and articles manufactured using this web, the productivity, processability, and cost. The fiber bundle comprising continuous fibers aligned in one direction is characterized in that the continuous fibers have crimps that form peaks and valleys in the width direction of the fiber bundle, and these crimps have a characteristic value A, defined as the absolute value of a slope with respect to the length direction of the fiber bundle of a straight line that connects the vertex of the peak with the vertex of the valley of adjacent crimps present in a single continuous fiber, of at least 0.3.