Fiber Sorting Using Electric Field Alignment
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Solution Overview
Problem
Existing methods for determining the distribution of fiber lengths in fiber reinforced polymeric articles are not accurate due to the random orientation of fibers during sorting, leading to inefficiencies in collecting and sorting fibers by length.
Innovation Solution
Fibers are separated from the polymer matrix and aligned using a high electric field in a non-polar liquid while passing through a stack of sieves with progressively smaller openings, allowing for more precise sorting and collection of fibers by length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fibers are sorted using traditional sieves with random orientation in liquid, then the sorting process is simple to operate, but the measurement precision of fiber length distribution is poor
Solution Approach 1:
The patent applies preliminary action by aligning fibers in a predetermined direction before they reach the sieves. This is achieved by directing the fiber-containing liquid through a channel with aligned screens that orient fibers parallel to the screen surface, ensuring that when fibers encounter the sieve openings, they are already positioned for accurate length-based sorting rather than random orientation.
Solution Approach 2:
The patent introduces a new dimension to the sorting process by adding the alignment dimension. Instead of only sorting fibers based on length through sieve openings, the system adds fiber orientation alignment as a preliminary step. This dimensional addition (orienting fibers in the direction of flow parallel to screens) enables more accurate length measurement by eliminating random angular variations.
2Productivity
If fibers are randomly oriented in liquid during sorting, then the device operation is simple, but the sorting accuracy and efficiency are reduced
Solution Approach 1:
The alignment system performs preliminary action by orienting fibers before the sorting process. The channel with aligned screens prepares the fibers by directing them parallel to the screen surface, so that when they reach the sieves, they are already in the correct orientation for efficient and accurate sorting, preventing misclassification.
Solution Approach 2:
The patent uses an intermediary structure (the channel with aligned screens) between the liquid fiber source and the sieves. This intermediary component serves to orient and align fibers in the direction of flow, acting as a mediator that transforms randomly oriented fibers into aligned fibers before they encounter the sorting sieves, thereby improving sorting efficiency.
3Manufacturing precision
If traditional sieve sorting is used without fiber alignment, then the process is easier to operate, but longer fibers may incorrectly pass through sieves and shorter fibers may be retained
Solution Approach 1:
The system performs preliminary alignment of fibers using a channel with screens that orient fibers parallel to the flow direction before they reach the classification sieves. This preliminary action ensures that when fibers encounter the sieve openings, their orientation is controlled, preventing longer fibers from diagonally passing through and shorter fibers from being incorrectly retained.
Solution Approach 2:
The patent adds the dimension of fiber orientation control to the sorting process. By introducing alignment screens that constrain fibers to move parallel to the screen surface, the system creates a controlled orientation dimension that works together with the length-based sieve filtering, thereby improving classification accuracy without significantly complicating operation.
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 enhances the accuracy of fiber length distribution analysis, enabling better control over the physical characteristics of molded articles by ensuring consistent and precise measurement of fiber lengths.
Implementation Method 1
aligned by the application of a high electric field, such as a DC field, while at the same time the fibers are passed through a stack of sieves
Data Source
AI summary
A method of determining the length distribution in the population of glass or plastic fibers in, for example, a fiber reinforced polymeric article wherein the fibers recovered from a representative article are immersed in a non-polar liquid and the combination of the liquid and fibers is passed through a sieve stack while an applied high electric field produces a relatively uniform alignment of the fibers as they pass through the sieves thereby improving the accuracy of the filtering process.