Plasma Carbonization Furnaces for Oxidized Fiber Heating
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Solution Overview
Problem
Existing carbonization methods for producing carbon fibers face challenges in applying appropriate tension and achieving high heating efficiency during the carbonization process, leading to prolonged processing times and potential fiber breakage.
Innovation Solution
A method involving multiple carbonization furnaces arranged in the conveying direction, where at least one furnace uses plasma heating, allowing for adjustable tension and efficient heating of fibers, with staged energy application to prevent fiber breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electric heater or indirect heating method is used in carbonization furnace, then the atmosphere inside furnace is heated uniformly, but the heating efficiency of oxidized fibers is low and carbonization time is prolonged
Solution Approach 1:
The patent replaces the conventional electric heater (thermal conduction system) with a plasma generation system that uses electromagnetic fields to directly heat the oxidized fibers. The plasma, generated by applying high-frequency power to a gas atmosphere, transfers energy directly to the fibers through electromagnetic coupling, eliminating the inefficiency of indirect heating through furnace atmosphere.
Solution Approach 2:
The oxidized fibers themselves serve as the medium for energy absorption and conversion. The fibers' electrical conductivity enables them to directly absorb electromagnetic energy from the plasma and convert it to thermal energy, making the heating process self-service and highly efficient without requiring external heating elements.
2Strength
If multiple carbonization furnaces are arranged in series to apply appropriate tension, then fiber mechanical properties are enhanced, but the processing time and system complexity increase
Solution Approach 1:
The patent divides the carbonization process into multiple stages by arranging several carbonization furnaces in series, each operating at different temperature conditions. This segmentation allows progressive carbonization with appropriate tension control at each stage, optimizing mechanical properties while managing the overall process efficiency.
Solution Approach 2:
The patent varies key parameters (temperature, plasma power, residence time) across different carbonization furnaces to optimize the carbonization process at each stage. By changing these parameters progressively, the system achieves enhanced mechanical properties without requiring excessively long processing times in any single furnace.
3Strength
If high tension is applied to fibers during carbonization, then mechanical properties are improved, but fiber breakage may occur
Solution Approach 1:
The patent applies preliminary plasma treatment and gradual heating in early carbonization stages to pre-condition the oxidized fibers, enhancing their structural stability before applying higher tensions in subsequent stages. This preliminary action prepares the fibers to withstand the mechanical stresses of high-tension carbonization without breaking.
Solution Approach 2:
The patent dynamically adjusts the tension applied to fibers and the plasma power levels across different carbonization furnaces based on the fiber's state at each stage. This dynamic control allows optimal tension to be applied when fibers can withstand it, while reducing tension when fibers are more vulnerable, preventing breakage while maximizing mechanical property enhancement.
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 approach enables efficient heating and reliable carbonization of fibers with appropriate tension, reducing processing time and improving the mechanical properties of carbon fibers.
Implementation Method 1
heating means that uses plasma to heat the fibers when the fibers are passing through the inside of the at least one carbonization furnace
Data Source
Figure 1
Figure 2A~2D
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AI summary
A carbonization method of carbonizing precursor fibers that are being conveyed includes carbonization performed using a plurality of carbonization furnaces for heating fibers arranged in the direction in which the fibers are conveyed. The plurality of carbonization furnaces include at least one carbonization furnace that heats the fibers using plasma when the fibers are passing through the inside of the at least one carbonization furnace. A carbon fiber production method includes a carbonization process of carbonizing precursor fibers that are being conveyed. The carbonization process is performed with the above carbonization method.