Fiber Mat Manufacturing via Light Fusion Bonding
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Solution Overview
Problem
Conventional methods for manufacturing fiber mats with fine fibers struggle to achieve high strength due to the lack of hydrogen bonds in chemical fibers, leading to poor electrical properties and heat resistance, and the separation of fiber mats from mesh or papermaking wires is challenging, especially with ultra-short fibers.
Innovation Solution
A method involving the dispersion of fine thermoplastic fibers in a medium, followed by light application to fusion-bond the fibers on the surface of a support, allowing for separation and further bonding on the opposite surface, using liquid crystal polymer powder with specific aspect ratios and diameters to enhance strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chemical fibers without hydrogen bonds are used to form fiber mats, then cost is reduced and processing is simplified, but the fiber mat lacks sufficient strength for handling
Solution Approach 1:
The patent applies parameter changes by controlling the melting point relationship between the support material and fiber material. The support material is selected to have a melting point lower than the fiber material, enabling selective melting and bonding of fibers to the support surface through heating, thereby achieving sufficient bond strength without requiring hydrogen bonds or additional binders
Solution Approach 2:
The support material acts as an intermediary between the fiber mat and the bonding process. By melting the support material (which has lower melting point than the fibers), it creates a bonding interface that holds the fibers together, effectively mediating the strength problem without requiring the fibers themselves to have hydrogen bonding capabilities
2Strength
If calender processing is performed to compression-bond fibers, then fiber mat strength is improved, but separation of fiber mat from mesh or papermaking wire becomes difficult
Solution Approach 1:
The patent uses parameter changes by carefully controlling the melting point of the support material to be lower than the fiber material. This allows the support to melt and bond fibers during processing, then solidify and enable easy separation afterward, resolving the contradiction between achieving strength through compression bonding and maintaining ease of separation
Solution Approach 2:
The support material dynamically changes its state from solid to liquid during processing, enabling it to serve dual functions: providing structural support during formation and facilitating easy separation afterward. This dynamic state change resolves the contradiction between bonding strength and separation ease
3Reliability
If higher-melting-point material is used in mesh or papermaking wire to handle fine high-melting-point resin fibers, then fiber integrity is maintained, but manufacturing cost increases
Solution Approach 1:
The patent inverts the traditional melting point relationship by using support material with lower melting point than the fibers. This allows the use of inexpensive, low-melting-point support materials while still maintaining fiber integrity through controlled melting and bonding, thereby reducing manufacturing cost without sacrificing reliability
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 produces a fiber mat with a breaking strength of 45 cN/20 mm or more, ensuring separation without breakage and maintaining high air permeability and collection efficiency.
Implementation Method 1
applying light to a first main surface of the mat so as to fusion-bond the fine fiber located on the first main surface side of the mat
Data Source
AI summary
A method for manufacturing a fiber mat includes: dispersing a fine fiber having thermoplasticity in a dispersion medium; extracting the fine fiber from the dispersion medium onto the support to form a mat; and applying light to a first main surface of the mat so as to fusion-bond the fine fiber located on the first main surface side of the mat, the first main surface being opposite to the support.