Composite Sheet Material Fiber Orientation
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Solution Overview
Problem
Existing methods for forming composite sheet materials are often complex and unreliable, lacking in achieving superior properties such as uniform and high-density fiber packing.
Innovation Solution
A method involving a sacrificial sheet with an electrostatic charge is used to orient fibers orthogonally, which are then sandwiched between sheets with different adhesive properties, allowing for the introduction of resin and controlled electrostatic charging to enhance fiber alignment and packing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional flocking apparatus with electrostatic charge is used to orient fibers, then fiber orientation is achieved, but the process is complex and unreliable with poor manufacturing precision
Solution Approach 1:
The patent extracts the essential function of fiber orientation from the complex flocking apparatus and implements it using a simple pair of parallel electrodes. By removing unnecessary components and retaining only the critical electrostatic field generation capability, the system achieves reliable fiber orientation with significantly reduced complexity.
Solution Approach 2:
The patent changes the electrostatic field configuration from the traditional flocking apparatus to a simple parallel electrode system. By adjusting parameters such as electrode spacing, voltage application, and field distribution, the system achieves uniform fiber orientation perpendicular to the electrodes while simplifying the overall device structure.
2Strength
If fibers are densely packed between sheets, then mechanical properties improve, but adhesive application and resin introduction become difficult
Solution Approach 1:
The patent applies adhesive to the sheets before introducing the fibers, ensuring that the bonding surface is prepared in advance. This preliminary adhesive application allows for easier manufacturing while still achieving dense fiber packing, as the adhesive is already in position to bond fibers when they are placed between the sheets.
Solution Approach 2:
The patent divides the manufacturing process into distinct stages: adhesive application to sheets, fiber introduction, and then sandwiching. This segmentation allows each step to be optimized independently, making adhesive application easier while still achieving the desired dense fiber packing for mechanical strength.
3Manufacturing precision
If sacrificial sheet is used for fiber orientation, then fiber density uniformity improves, but an additional removal step is required
Solution Approach 1:
The patent uses a sacrificial sheet that is discarded after serving its purpose of providing a uniform electrostatic field for fiber orientation. This disposable approach achieves superior fiber density uniformity while the additional removal step is minimized by using easily removable sacrificial materials, balancing precision with productivity.
4Reliability
If multiple adhesive types are used on different sheets, then fiber sandwiching reliability improves, but process complexity increases
Solution Approach 1:
The patent applies different adhesive types to different sheets based on their specific functions. One sheet uses adhesive optimized for bonding to the fiber material, while the other uses adhesive optimized for bonding to the final composite structure. This local quality approach improves sandwiching reliability without requiring complex multi-step adhesive applications across all sheets.
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
This method results in a composite sheet material with improved uniformity and fiber density, offering superior mechanical properties and simplifying the manufacturing process.
Implementation Method 1
energising the pair of electrodes to apply an electrostatic charge to a bed of fibres located therebetween thereby orienting at least some of the fibres to be substantially orthogonal to the electrodes and adhered to the first sheet
Data Source
AI summary
A method of forming a composite sheet material, the method comprises energising a pair of electrodes to apply an electrostatic charge to a bed of fibres located therebetween thereby orienting at least some of the fibres to be substantially orthogonal to the electrodes and sandwiching at least some of the oriented fibres between a first sheet and a second sheet. The first sheet may be subsequently removed. A third sheet may be used to sandwich the fibres between the second sheet and the third sheet. Apparatus (100) is disclosed for carrying out the method.