70-Meter Long Acrylic Fiber Pre-Oxidation Tunnel Furnace
Category：Tunnel Oven Production Line
Introduction
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.
If you're ready to take the next step, Leave your message below and we’ll reply soon. 20+ years of manufacturing & export experience, a partner you can trust.
