Microfiber Production via Stretching and Folding
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Solution Overview
Problem
Current methods for producing micro- and nanofibers face challenges such as limited production rate, difficulty in controlling fiber diameter, issues with producing aqueous-based fibers, and challenges in achieving fiber alignment and separation, which hinder their industrialization and commercialization.
Innovation Solution
A method involving the repeated stretching and folding of a ring-shaped precursor, where the precursor consists of a core material and a sacrificial sheath, allowing for the exponential reduction of fiber diameter from hundreds of microns to below 100 nanometers, and enabling easy alignment and separation of fibers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If nozzle-based methods (electrospinning, wet spinning, thermal extrusion) are used to produce micro- and nanofibers, then fiber formation is achieved, but production rate is limited and manufacturing efficiency is low
Solution Approach 1:
The patent replaces complex nozzle-based mechanical systems (electrospinning apparatus, wet spinning equipment, thermal extrusion devices) with a simple microfluidic chip-based system. The microfluidic device uses passive flow control and sacrificial core removal to form fibers without requiring high-voltage electric fields, complex nozzle mechanisms, or thermal processing equipment, thereby dramatically increasing production rate while reducing device complexity
Solution Approach 2:
The patent changes the fundamental manufacturing parameter from active material ejection through nozzles to passive fiber formation through sacrificial core removal. By using a soluble sacrificial core that dissolves in water, the system transforms the fiber formation process into a simple extraction operation rather than a complex extrusion or electrospinning process, enabling high-yield production
2Manufacturing precision
If nozzle-based methods are used, then fibers can be produced, but difficulty in controlling fiber diameter precisely
Solution Approach 1:
The patent applies local quality by using a sacrificial core with a specific diameter that directly determines the final fiber diameter. The core material (e.g., wax, gelatin, or other water-soluble substances) is placed at the center of the liquid crystal polymer channels, and its diameter precisely controls the fiber outer diameter after core removal. This local placement of the sacrificial core simplifies diameter control while achieving high manufacturing precision
Solution Approach 2:
The sacrificial core acts as an intermediary that defines the fiber diameter during manufacturing. By using a core material with a known, controllable diameter that is subsequently removed by water dissolution, the system achieves precise fiber diameter control without requiring complex diameter adjustment mechanisms in the manufacturing apparatus
3Adaptability or versatility
If conventional methods are used to produce aqueous-based fibers, then fiber formation is possible, but significant challenges and limitations exist
Solution Approach 1:
The patent converts the solubility of the sacrificial core material in water from a potential manufacturing complication into a beneficial feature. By using water-soluble sacrificial cores (wax, gelatin, salts), the system enables easy core removal through water rinsing, which simultaneously produces aqueous-based fibers and simplifies the manufacturing process. The water solubility that could cause handling difficulties is instead used to enable simple core extraction and fiber collection
4Ease of operation
If traditional methods are used, then fibers are produced, but difficulty in achieving fiber alignment and separation
Solution Approach 1:
The patent uses segmentation by creating multiple independent microfluidic channels, each containing a sacrificial core. When the cores are removed by water dissolution, fibers from each channel are naturally separated and can be individually collected or bundled. This segmented channel design provides automatic fiber separation without requiring complex mechanical separation devices, significantly improving ease of operation while maintaining simple device structure
Solution Approach 2:
Instead of actively aligning and separating fibers through complex mechanical means after production, the patent inverts the approach by designing the microfluidic channels to naturally guide and separate fibers during the formation process itself. The channel geometry and flow direction inherently provide fiber alignment, eliminating the need for subsequent alignment operations
Data Source
AI summary
In one embodiment, the present invention is a method for producing microfibers comprising the steps of: (a) providing a base material; (b) forming the base material in a ring; (c) gripping opposing ends of the ring; (d) flipping one of the opposing ends relative to the other of the opposing ends, forming an upper portion and a lower portion; (e) folding the upper portion onto the lower portion; (f) stretching the folded upper and lower portions; and (g) repeating steps (d)-(f) as desired.