Electrospun Filament Collection Using Curved Drum Dynamics
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for collecting electrospun fibers often result in nonwoven mats with low mechanical strength and limited length and thickness, making them unsuitable for applications requiring robust and scalable continuous filaments, especially in tissue repair and engineering.
Innovation Solution
A method using a conducting, elongate three-dimensional collection surface to form a continuous filament by moving the surface relative to the source of electrically charged fibers, allowing for interlinking and alignment of fibers, which enhances mechanical integrity and bio-mimetic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a planar stationary plate is used as a collector, then electrospun fibres form nonwoven fibre mats, but the mechanical strength is low and the fibres are randomly oriented
Solution Approach 1:
The patent applies curvature by replacing the planar stationary plate with a cylindrical drum collector. The curved surface of the cylinder causes fibres to wrap around and interlink as the drum rotates, transforming the random mat structure into a more organized, mechanically stronger configuration with improved fibre interconnection.
Solution Approach 2:
The patent introduces dynamic motion by rotating the cylindrical drum collector at controlled speeds. This dynamic collection process allows fibres to be deposited continuously while wrapping around the drum, creating interlinked structures that enhance mechanical strength compared to static planar collection.
2Productivity
If liquid collectors are used to produce continuous bundles, then fibre collection is continuous, but the bundles have low levels of linking between fibres and are prone to breakage
Solution Approach 1:
The patent replaces liquid collectors with a solid cylindrical drum collector that can be easily rotated and reused. This solid collector avoids the problems of liquid collectors while maintaining continuous collection capability, and the drum can be simply rotated to discard accumulated fibres and start fresh, providing a reliable, breakage-resistant collection method.
Solution Approach 2:
The rotating drum provides continuous motion for fibre collection, enabling uninterrupted production while the mechanical rotation ensures fibres are firmly attached to the solid surface through friction and interlinking, preventing bundle breakage that occurs with liquid-based methods.
3Ease of manufacture
If fibres are collected as random mats, then collection is simple, but the fibres lack alignment and have limited length and thickness
Solution Approach 1:
The cylindrical drum collector naturally guides fibres along its curved surface, causing them to wrap around and accumulate in a continuous helical or layered pattern. This curvature transforms simple random deposition into organized, extended fibre structures with increased apparent length and thickness while maintaining manufacturing simplicity.
Solution Approach 2:
The patent transitions from two-dimensional planar collection to three-dimensional cylindrical collection. Fibres are deposited on the curved surface of the rotating drum, creating multi-layered, wrapped structures that effectively increase filament length and thickness without complicating the collection process.
4Stability of the object's composition
If dynamic mechanical collectors are used to produce aligned fibres, then some alignment is achieved, but the fibres form loose bundles with little interaction between fibres
Solution Approach 1:
The cylindrical drum causes fibres to wrap around the curved surface, creating natural interlinking points where fibres cross and adhere to each other. This curvature-induced wrapping enhances fibre interaction and bundle coherence while maintaining alignment, solving the problem of loose fibre assemblies.
Solution Approach 2:
The continuous rotation of the drum creates dynamic fibre deposition with controlled wrapping angles. This motion ensures fibres are firmly pressed against the drum surface and interlinked with previously deposited fibres, creating coherent, strong bundles rather than loose assemblies.
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 approach produces highly textured, stronger, and more bio-mimetic filaments with improved cell attachment and growth, suitable for weaving and plaiting, and is scalable and easy to execute, with enhanced mechanical properties and flexibility.
Implementation Method 1
forming an attractive electric field gradient between the collection surface and a source of electrically charged fibres
Implementation Method 2
The viscosity of the polymer solution prevents the liquid from breaking up into droplets due to surface tension and instead causes the liquid solution to remain as a jet that solidifies into fibres due to solvent evaporation
Data Source
AI summary
A method for producing a continuous filament from electrospun fibers includes providing a conducting collection surface that is an elongate three-dimensional surface. An attractive electric field gradient is formed between the collection surface and a source of electrically charged fibers. The collection surface is moved in a longitudinal direction relative to the source of electrically charged fibers. The fibers are collected on the collection surface so as to form a continuous filament.