Fiber sheet and method for manufacturing same
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Solution Overview
Problem
Fiber sheets produced by electrospinning have low tensile strength and anisotropy due to randomly deposited fibers, making them unsuitable for applications requiring high mechanical strength and oriented fiber alignment.
Innovation Solution
A method involving electrospinning to form fibers, aligning them using a rotating collector, and then performing a close-adhesion process with a volatile liquid to enhance fiber orientation and adhesion, resulting in a fiber sheet with high tensile strength and anisotropy by aligning fibers in a specific direction and reducing pore size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If fibers are randomly deposited to form a deposited body, then the manufacturing process is simple, but the tensile strength and anisotropy of the deposited body are low
Solution Approach 1:
The patent applies preliminary action by introducing a volatile liquid to the deposited body before final drying. This liquid penetrates the fiber structure and enables close adhesion between fibers during the subsequent drying process, thereby improving tensile strength and anisotropy before the final product is obtained
Solution Approach 2:
The patent changes the physical state and properties of the fiber structure by introducing a volatile liquid that alters the adhesion parameters between fibers. The liquid modifies the surface properties and enables closer fiber packing, transforming the loose random structure into a densely adhered structure with improved mechanical properties
2Strength
If fibers are closely adhered through drying with volatile liquid, then tensile strength and anisotropy are improved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent uses a volatile liquid as an intermediary substance that facilitates close adhesion between fibers. The liquid acts as a temporary mediator that enables fiber bonding during drying, then evaporates completely, leaving no residue and requiring no additional removal steps
Solution Approach 2:
The volatile liquid performs multiple functions automatically: it penetrates the fiber structure, enables close adhesion during drying, and then self-removes through evaporation. The drying process itself serves to both consolidate the fibers and remove the liquid, eliminating the need for separate treatment steps
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 tensile strength of 1 MPa or more in one direction and twice that in the orthogonal direction, providing high mechanical strength and oriented fiber alignment, suitable for various technical fields and applications.
Implementation Method 1
forming a fiber by electrospinning
Implementation Method 2
supplying a liquid to the deposited body, the liquid being volatile; and drying the deposit body including the volatile liquid
Data Source
AI summary
According to one embodiment, a fiber sheet includes a plurality of fibers. The plurality of fibers are in a closely-adhered state.All of the following (1) to (3) are satisfied, where F1 is a tensile strength in a first direction, and F2 is a tensile strength in a second direction orthogonal to the first direction:(1) F2>F1; (2) F1 is 1 MPa or more; and(3) F2/F1 is 2 or more.