Hot Air Nozzle Segmentation for Uniform Fiber Bundle Oxidation
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Solution Overview
Problem
In the carbon fiber bundle manufacturing process, maintaining uniform air speed distribution along the hot air supply nozzle is challenging, leading to uneven heat treatment and quality issues in the oxidation process, particularly due to increased fiber bundle density and passage path width, which causes fiber bundle swinging and mixing, resulting in product deterioration.
Innovation Solution
The oxidation heat treatment oven incorporates a hot air supply nozzle with stabilization chambers and cylindrical bodies that stabilize airflow, ensuring uniform air speed distribution by adjusting the internal angle of the cylindrical bodies and the partition plate, reducing air speed variation and preventing fiber bundle swinging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the width of the passage path for the fiber bundle is increased to improve productivity, then the treatment amount per unit time is increased, but the air speed distribution along the width of the hot air supply port becomes non-uniform, causing quality unevenness
Solution Approach 1:
The hot air supply port is divided into multiple independent nozzles (first hot air supply nozzle and second hot air supply nozzle) arranged along the fiber bundle traveling direction. Each nozzle has a smaller width that can maintain uniform air speed distribution, while collectively they cover the entire passage path width, thus resolving the contradiction between increased productivity and maintained quality uniformity.
Solution Approach 2:
Instead of increasing the width of a single hot air supply port to handle more fiber bundles, the solution transitions to the longitudinal dimension by arranging multiple nozzles along the fiber bundle traveling direction. This dimensional shift allows maintaining narrow nozzle widths for uniform air speed while increasing overall treatment capacity through multiple nozzles.
2Productivity
If the density of fiber bundles in the oxidation oven is increased to improve productivity, then the treatment amount per unit time is increased, but the non-uniform air speed distribution causes fiber bundle swinging and mixing, deteriorating product quality
Solution Approach 1:
The hot air supply system is segmented into multiple nozzles positioned at different locations along the fiber bundle path. This segmentation enables localized and uniform hot air delivery to each fiber bundle, preventing the swinging and mixing caused by non-uniform air speed, thus maintaining process stability while handling increased fiber bundle density.
Solution Approach 2:
Each hot air supply nozzle is designed to provide locally uniform air speed distribution to its specific target area. This local quality control ensures that each fiber bundle receives consistent hot air treatment, preventing swinging and mixing even when fiber bundle density is increased, thereby maintaining 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
This configuration enables the production of oxidized fiber bundles with uniform physical properties and high quality by maintaining consistent heat removal performance and reducing fiber bundle contact issues, thereby enhancing process stability and product quality.
Implementation Method 1
heat-treat a fiber bundle that is an aligned acrylic fiber bundle in an oxidizing atmosphere to form an oxidized fiber bundle
Implementation Method 2
the reaction heat generated by the oxidation reaction of the fiber bundle is removed by hot air supplied into the oven
Data Source
AI summary
There is provided an oxidation heat treatment oven including a heat treatment chamber configured to heat-treat a fiber bundle that is an aligned acrylic fiber bundle in an oxidizing atmosphere to form an oxidized fiber bundle; a slit-shaped opening configured to take the fiber bundle in and out of the heat treatment chamber; guide rollers installed at both ends of the heat treatment chamber and configured to turn the fiber bundle back; a hot air supply nozzle that has a longitudinal axis along the width of the fiber bundle traveling and that blows out hot air, in a direction substantially parallel to a traveling direction of the fiber bundle, above and/or below the fiber bundle traveling in the heat treatment chamber; and a suction nozzle configured to suck the hot air blown out from the hot air supply nozzle, in which the hot air supply nozzle satisfies disclosed conditions (1) to (3).