Tunnel oven-Tunnel_oven-Shanghai Guanding Industrial Equipment Co., Ltd.-Manufacturers of tunnel ovens, drying ovens, UV curing machines, coating equipment, high-temperature furnaces, and industrial robots

Internal Curing Structure of Tunnel Oven

Core Product Value

The Tunnel Oven focuses on the core scenario of Final Curing of Industrial Coatings. With three technical advantages—Continuous Curing, Precise Temperature Control, and Explosion-Proof Design—it addresses the pain points in industrial coating and curing processes: "low curing efficiency, poor uniformity of industrial coating, and flammability/explosiveness of solvent-based ink":

Efficiency Boost via Continuous Curing: Continuous pass-through design enables automated and continuous production for the industrial coating curing process, increasing production line efficiency by over 40%.
Precise Temperature Control & Uniformity: Accurate temperature control at 140-150℃ with ±1℃ uniformity, ensuring full curing and uniform surface of industrial coating without bubbles or color differences.
Explosion-Proof Safety Guarantee: For solvent-based industrial coating, it adopts explosion-proof heating system, gas monitoring, and high-power exhaust design to eliminate flammable and explosive risks.

Core Technical Features

Continuous Pass-Through Curing

Steel belt/mesh belt continuous conveying design allows workpieces to pass through the multi-zone tunnel at a constant speed. It enables automated and continuous production for the industrial coating curing process, adapting to the rhythm of large-scale continuous production lines.

Precise Temperature Control & Uniformity

Independent PID temperature control for multi-zones + infrared temperature measurement feedback. Temperature range is 140-150℃ with ±1℃ uniformity, ensuring consistent curing degree of industrial coating across the entire workpiece surface, improving appearance and insulation performance.

Explosion-Proof Safety Design

Explosion-proof heating tubes, explosion-proof motors, and combustible gas monitoring system (optional). High-power exhaust device quickly discharges solvent vapor, meeting Ex dⅡBT4 explosion-proof requirements for solvent-based industrial coating.

Programmable Temperature Curve

PLC control system supports 16 segments of programmable temperature curves. It can customize heating, heat preservation, and cooling processes according to the curing characteristics of different brands and types of industrial coating, with strong adaptability.

Efficient Hot Air Circulation

Corrosion-resistant centrifugal fan + deflector design enables 360° uniform hot air circulation inside the tunnel. Curing efficiency is increased by 30% while avoiding local overheating or insufficient curing of workpieces.

Flexible Bandwidth Adaptation

Bandwidth supports customization of 300mm, 500mm, 800mm, 1200mm, and other specifications. It adapts to the curing needs of workpieces of different sizes, including single-sided, double-sided, and multi-layer boards.

Technical Parameters & Performance

Core Parameters

Applicable Process Final Curing of Industrial Coatings

Temperature Range 140-150℃

Temperature Uniformity ±1℃

Heating Method Clean Hot Air Circulation Heating

Temperature Control Method：Multi-Zone PID + Programmable Curve

Explosion-Proof Class (Optional)：Ex dⅡBT4

Bandwidth Specifications (Optional)

• 300mm
• 500mm
• 800mm
• 1200mm
• Custom

Conveying Speed

• 0.5-5m/min (Adjustable)
• Adapts to Different Curing Time Requirements

Temperature Uniformity Test (150℃ Working Condition)

Test Conclusion

Under the typical curing temperature (150℃) for industrial coating, the temperature fluctuation in different zones of the tunnel oven (entry, middle, exit) is ≤±1℃. This ensures consistent curing degree of industrial coating across the entire workpiece surface, meeting the appearance and performance requirements of high-end industrial products (e.g., boards for automotive electronics and medical equipment).

Application Scenarios & Processes

Core Process for Final Curing of Industrial Coatings

After industrial coating printing, final curing is required at 140-150℃ to form a dense, insulating, and wear-resistant solder mask layer. The tunnel oven ensures full cross-linking and curing of the industrial coating while avoiding defects such as bubbles and pinholes through "continuous conveying + multi-zone temperature control + uniform hot air".

Typical Solder Mask Ink Curing Process Curve

1 Preheating Zone：Room Temp → 100℃, gradient heating in multi-zones for initial ink curing
2 Curing Zone：100℃ → 150℃, core curing zone with 20-30min heat preservation (full ink cross-linking)
3 Cooling Zone：150℃ → 60℃, slow cooling to avoid stress cracking of the solder mask layer

The equipment's programmable temperature control system can accurately replicate the above multi-zone curve. Through "gradient heating + sufficient heat preservation + slow cooling", it ensures the adhesion, insulation resistance, and chemical resistance of the solder mask layer reach optimal levels.

Extended Application Scenarios

Character Ink Curing

Final curing of character ink (e.g., silk-screen characters) on workpieces. The 140-150℃ temperature range ensures clear, wear-resistant, and chemical-resistant characters.

Coating Curing (e.g., Conformal Coating)

Curing of conformal coatings (moisture-proof, mildew-proof, salt-fog-proof) on workpiece surfaces. The continuous tunnel oven enables large-scale and uniform coating curing, improving protection performance.

High-Temperature Tape Curing

Thermal curing and bonding of special high-temperature tapes. The continuous high-temperature environment of the tunnel oven ensures full adhesion between the tape and workpiece, enhancing reliability.

Successful Application Cases

Industry Solutions

Continuous Drying Solution for Precision Manufacturing

1. Core Equipment Configuration and Technical ParametersEquipment TypeQuantityKey Technical ParametersApplication ScenariosPrecision Tunnel-Type Continuous Drying Line3 linesTemperature Control Range: 50~200℃ (Accuracy ±0.3℃); Conveying Speed: 0.2~1.5m/min (frequency-variable adjustable); Drying

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