Method for manufacturing a fiber sheet
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Solution Overview
Problem
Existing methods for manufacturing fiber sheets using electrospinning result in low tensile strength and anisotropy, as the fibers are randomly deposited and lack alignment, making them unsuitable for applications requiring high mechanical strength and directional orientation.
Innovation Solution
A method involving electrospinning to form fibers, followed by alignment using a rotating collector and a close-adhesion process with a volatile liquid, such as alcohol or acetone, to enhance fiber orientation and adhesion, resulting in a fiber sheet with high tensile strength and anisotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibers are randomly deposited by electrospinning, then the deposited body can be formed easily, but the tensile strength and anisotropy of the deposited body remain low
Solution Approach 1:
The patent introduces a rotating collector that rotates in the direction of fiber deposition, dynamically changing the collection angle and position. This rotation transforms the static random deposition into a dynamic aligned deposition process, where fibers are continuously reoriented along the rotation direction, achieving both high tensile strength and anisotropy without significantly increasing process complexity
Solution Approach 2:
The patent applies preliminary alignment action by rotating the collector before fibers are fully deposited. The rotation creates a predetermined orientation pattern that guides fiber deposition, ensuring fibers align in the desired direction before the deposition process completes, thereby achieving high tensile strength and anisotropy from the outset
2Strength
If a rotating collector is used to align fibers, then fiber orientation and tensile strength improve, but the manufacturing process becomes more complex
Solution Approach 1:
The rotating collector serves multiple functions simultaneously: it collects fibers, aligns them through rotation, controls deposition angle, and determines fiber orientation. This multi-functionality reduces the need for separate alignment devices, achieving high tensile strength while minimizing additional device complexity
Solution Approach 2:
The patent controls fiber orientation by changing the rotation speed and rotation direction of the collector. By adjusting these parameters, the system achieves desired tensile strength and anisotropy levels without requiring complex mechanical alignment mechanisms, as parameter adjustment alone suffices for optimization
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 method achieves a fiber sheet with significantly improved tensile strength and anisotropy, allowing for higher mechanical performance and orientation, making it suitable for various technical applications.
Implementation Method 1
forming a fiber by electrospinning
Implementation Method 2
drying the deposited body including the volatile liquid to remove the volatile liquid
Data Source
Figure 1
Figure 2A~3B
Figure 4A~5B
AI summary
A method for manufacturing a fiber sheet comprises forming a fiber by electrospinning; forming a deposited body by depositing the fiber; supplying a volatile liquid to the deposited body; and drying the deposited body.