Infrared Core Drying Tunnel for Pulp Molding | Uniform Internal Drying for Complex 3D Shapes
Product Overview
Our specialized infrared drying tunnel provides rapid, uniform, and energy-efficient internal drying for three-dimensional pulp molded products. Utilizing a customizable mix of medium-wave and short-wave infrared emitters, it penetrates thick pulp walls to drive moisture from the core, significantly reducing drying time compared to conventional hot air methods.
Production Line Composition
- Infeed Conveyor (Synced with forming/pressing station)
- Customizable IR Emitter Array Modules (Top, Bottom, Side configurations)
- Stainless Steel Tunnel with Insulated Panels
- Reflective Cavity for Maximum Efficiency
- Zoned Temperature Control System
- Auxiliary Air Circulation & Moisture Exhaust System
- Outfeed Conveyor
- Central Control Cabinet with PLC and Touchscreen HMI
Technical Specifications
| Parameter Category |
Details & Specifications |
| Drying Technology |
Medium-Wave & Short-Wave Infrared (Mix customizable) |
| Heating Power |
Customizable per zone (e.g., 30kW - 200kW total) |
| Spectral Wavelength |
Medium-wave: ~2.4-3.0 μm, Short-wave: ~0.8-1.4 μm |
| Maximum Temperature |
Up to 400°C at emitter surface (adjustable) |
| Conveyor Type |
Mesh belt (standard) or chain conveyor; width customizable |
| Conveyor Speed |
Variable, 0.5 - 5 m/min (synchronizable with main line) |
| Control System |
PLC with PID control; independent temperature zones (number customizable) |
| Temperature Uniformity |
±5°C within a control zone (typical) |
| Power Supply |
380V / 50Hz, 3-Phase (Customizable to local standards) |
| Construction |
Galvanized steel frame, interior with high-reflectivity aluminum panels |
Applications
Ideal for internal drying and moisture reduction of various pulp molded products, including:
- Egg trays and fruit trays
- Disposable tableware (plates, bowls, clamshells)
- Industrial protective packaging
- Cardboard replacement products
Key Features
- Deep Penetration: Infrared energy dries from the inside out, preventing surface hardening
- Rapid Response & Control: IR emitters heat up and cool down almost instantly for precise temperature management
- Zoned Drying: Independent control of temperature across different sections allows for optimized drying profiles for complex shapes
- High Energy Efficiency: Direct energy transfer to the product and minimal heat loss to the surrounding air
- Reduced Floor Space: Faster drying rates allow for a more compact tunnel compared to convection ovens
Customization Options
We offer highly customizable designs to match your specific product and production line. Options include the number and layout of IR zones, emitter wavelength mix, conveyor width and type, housing dimensions, control system integration, and safety features.
Support & Services
We provide comprehensive support including installation supervision, operational training, process optimization assistance, preventive maintenance plans, and timely spare parts supply.
Packing & Shipping
The equipment is modularly disassembled and securely packed in weatherproof wooden crates. All electrical components are protected for safe long-distance shipping. Standard terms are FOB, with other incoterms available.
Frequently Asked Questions
Q: Why is infrared drying better for thick pulp molded products?
A: Infrared penetrates and heats the product's core directly, driving moisture out uniformly. This avoids the common issue of a hard, dry shell forming over a wet core, which can lead to warping or cracking.
Q: Can the system be integrated into my existing conveyor line?
A: Yes. The conveyor system, inlet/outlet height, and control signals can be customized for seamless integration with your forming, pressing, or finishing stations.
Q: How is the temperature profile for different products managed?
A: The PLC allows you to create and save multiple recipes. Each customizable zone's temperature and conveyor speed can be preset for different product types, ensuring optimal drying.
Q: What about safety and overheating?
A: The system includes multiple safety interlocks, over-temperature protection, and automatic shutoff features. The exterior remains safe to touch during operation.
Q: What is the typical energy consumption compared to a hot air oven?
A: Energy savings are significant, often 30%-50%, because IR directly heats the product, not the entire air volume in a large chamber. Exact figures depend on the product and line speed.
