70-Meter Long Acrylic Fiber Pre-Oxidation Tunnel Furnace
The 70-meter long acrylic fiber pre-oxidation tunnel furnace is a core thermal processing equipment in carbon fiber production lines. It is mainly used for the staged thermal stabilization (pre-oxidation) treatment of polyacrylonitrile (PAN) precursor fibers.
Applications
Pre-Oxidation of Precursor Fibers:
Used for continuous stretching and thermal treatment of PAN precursor fibers in an air atmosphere at 200℃–300℃.
Molecular Chain Cross-Linking:
Promotes the transformation of linear polymer chains into heat-resistant ladder-type six-membered ring structures.
Prevention of Melting and Carbonization:
Improves the thermal stability of fibers, ensuring that they do not melt or burn during the subsequent high-temperature carbonization process.
Parameters
| Parameter Item | Technical Specification |
|---|---|
| Equipment Length | 70 meters |
| Working Temperature | 200℃ — 300℃ |
| Temperature Control Accuracy | ±0.5℃ |
| Number of Temperature Zones | Multiple independently controlled temperature zones (usually 6–10 sections) |
| Operating Speed | 0.5 — 15 meters/minute (adjustable) |
| Hot Air Circulation | Double-side or upper/lower alternating penetrating circulation |
| Heating Method | Electric heating or gas-fired radiant tube heating |
Features
Ultra-Long Uniform Temperature Control:
The equipment adopts precision multi-zone independent temperature control to ensure highly uniform temperature distribution throughout the 70-meter furnace chamber.
Flexible Tension Control:
Equipped with high-precision traction roller systems to strictly control fiber shrinkage and stretching during the pre-oxidation process.
Efficient Exhaust Gas Removal:
The specially designed tar removal and exhaust gas system timely removes reaction by-products and prevents fiber contamination.
Energy-Saving Insulation Structure:
Uses a high-density composite refractory fiber insulation layer to significantly reduce heat loss from the furnace body surface.
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