Enhanced flash evaporation/electrospinning composite spinning equipment
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Solution Overview
Problem
Ultra-high molecular weight polyethylene materials face issues of easy delamination, relatively low waterproof performance, and relatively low air permeability, limiting their further development in specific fields.
Innovation Solution
A composite ultrafine nanofiber material is prepared by combining flash spinning and electrospinning processes, where the nozzles are positioned 15-40 cm apart, with one connected to a high-voltage power supply and the other grounded, using specific polymers and solvents, and incorporating a hydrophobic agent to enhance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If separate flash evaporation spinning is used to prepare ultra-high molecular weight polyethylene material, then the material has excellent strength, but the material exhibits easy delamination, relatively low waterproof performance, and relatively low air permeability
Solution Approach 1:
The patent combines flash evaporation spinning and electrospinning processes into a composite spinning system, where flash spinning produces microfibers and electrospinning produces nanofibers simultaneously. The two processes are merged in space and time, with nozzles positioned 15-40 cm apart, creating a composite ultrafine nanofiber material that integrates the advantages of both methods to improve waterproof performance while maintaining strength
Solution Approach 2:
The patent creates a composite material structure by combining microfibers from flash spinning and nanofibers from electrospinning into a single nonwoven fabric. This composite structure, with fibers of different diameters and properties, enhances the overall material performance, particularly waterproof performance and air permeability, while maintaining the excellent strength characteristics of ultra-high molecular weight polyethylene
2Stability of the object's composition
If the distance between electrospinning nozzle and flash spinning nozzle is reduced to enhance fiber mixing, then nanofibers may be blown away by strong airflow from flash evaporation
Solution Approach 1:
The patent employs dynamic control of the nozzle positioning system, allowing the distance between electrospinning and flash spinning nozzles to be adjusted within the 15-40 cm range. This dynamic adjustment enables optimization of fiber mixing while preventing nanofiber loss due to airflow, adapting to different production requirements and maintaining system reliability
Solution Approach 2:
The patent introduces an intermediary grounded receiving conveyor belt positioned below both nozzles to collect fibers. This intermediary structure provides a stable collection surface that prevents nanofibers from being blown away while still allowing sufficient mixing, acting as a mediator between the two spinning processes
3Reliability
If the distance between electrospinning nozzle and flash spinning nozzle is increased to prevent nanofiber loss, then microfibers and nanofibers will not be mixed effectively
Solution Approach 1:
The patent transitions from a single-dimension horizontal nozzle arrangement to a three-dimensional configuration where nozzles are positioned both horizontally apart (15-40 cm) and vertically above a receiving conveyor belt. This dimensional change allows sufficient distance to prevent nanofiber loss while maintaining effective mixing through the combined airflow patterns and gravity-driven fiber deposition
4Length of moving object
If secondary stretching technique is applied to thin fiber diameter, then fiber diameter becomes thinner, but entanglement degree and porosity of the material remain poor
Solution Approach 1:
The patent merges flash spinning and electrospinning processes to produce a composite of microfibers and nanofibers with different diameter ranges. This combination creates natural entanglement between fibers of different sizes, improving entanglement degree and porosity without requiring additional stretching operations that would further thin the fibers
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 resulting material exhibits enhanced strength, waterproof performance, and air permeability, with improved entanglement structures and bonding sites, addressing the limitations of previous materials.
Implementation Method 1
the nozzle of electrospinning is connected to the high-voltage power supply... to prepare the flash spinning/electrospinning composite ultrafine nanofiber material
Implementation Method 2
the flash evaporation is an instant release of pressure, there will be a strong airflow, just like a pressure cooker releasing pressure
Implementation Method 3
incorporating a hydrophobic agent to enhance properties... the addition of the hydrophobic agent in the electrostatic spinning solution enables the nanofibers to have a super-hydrophobicity, with a water contact angle >150°
Implementation Method 4
mixing with the flash spinning fibers randomly and finally sinking to the conveyor belt by gravity
Data Source
AI summary
An enhanced flash evaporation/electrospinning composite spinning equipment includes a flash spinning equipment, an electrospinning equipment, and a grounded receiving conveyor belt; the flash spinning equipment includes a flash spinning spinneret unit, the flash spinning spinneret unit includes a first spinneret, and the first spinneret is grounded; the electrospinning equipment includes a high-voltage power supply and an electrospinning spinneret unit, the electrospinning spinneret unit includes a second spinneret, and the second spinneret is connected to the high-voltage power supply; the first spinneret and the second spinneret are both located above the receiving conveyor belt at opposite positions with a distance of D, and the value range of D is 15-40 cm. The enhanced flash evaporation/electrospinning composite spinning equipment has a simple structure, and can prepare products that are not easy to delaminate, and excellent in waterproof performance and air permeability.