Radiation Angle
When designing infrared heating systems, we often say "power determines height, geometry determines quality." While lamp power is the foundation of furnace temperature, the true key to product yield lies in the precise configuration of irradiation angle and installation distance.
1. Defining the Radiation Angle: Effective Range vs. Precision Range
The energy from an infrared lamp is not diffuse but exhibits specific radiation characteristics. Standard Effective Range (120 degrees): A single lamp has an effective radiation angle of approximately 120 degrees. Where the process has a higher tolerance for temperature variation, calculating lamp spacing based on this angle is the more economical choice. High-Uniformity Precision Range (90 degrees): Where the product is extremely sensitive to surface temperature variation (such as semiconductor packaging, precision printing, or ultra-thin film processing), it is recommended to narrow the calculation basis to the central 90-degree zone.
2. The Overlap Effect: The Interplay of Angle and Spacing
The irradiation pattern of a single lamp resembles a conical zone. To achieve temperature uniformity, the overlap effect must be leveraged: reducing the distance between lamps so that the radiation zones of adjacent lamps overlap at their edges, eliminating hot spots and cold spots.
3. The Triad of Angle, Distance, and Temperature
Low Temperature (<150 degrees C): Recommended distance 20–25 cm, utilizing the 120-degree range for gentle, large-area coverage. Medium Temperature (150–300 degrees C): Recommended distance 10–15 cm, balancing ramp-up speed and overlap zones. High Temperature (>300 degrees C): Recommended distance 5–10 cm, utilizing the central 90-degree zone for high-intensity energy delivery.
4. Conclusion
Narrowing the calculated radiation angle (from 120 degrees to 90 degrees) requires deploying more lamps, but delivers substantial benefits in improved yield, accelerated production, and energy-efficient stability. If you are currently in product design, please provide your dimensions and target temperatures, and we will deliver a precise layout simulation recommendation.
