• Categories:IR Heating Applications
• Author:E-DEN IR Lighting
• Origin:E-DEN Lighting
• Time of issue:2023-03-28
• Views:0

(Summary description)Infrared heating technology is to use the principle of electromagnetic radiation heat transfer, the infrared radiation does not need to contact heated objects and does not require intermediate medium to transfer heat, direct heat transfer to heated objects. And our quartz infrared heating has high energy density, strong penetration, fast response, and good temperature controllability. Therefore, quartz infrared heating technology is widely used in printing, textile, semiconductor, glass, electronics and other industrial drying.

 



 

Especially in the paint coating drying, infrared rays have strong penetration, they can be absorbed by the particles and coating substrates inside the coating at the same time, from inside to outside or simultaneously heating the coating. Avoiding coating bubbles, shells or wrinkles phenomenon with a faster and higher quality drying coatings. Infrared heating can be placed horizontally or vertically around the coating, take up less space, save equipment costs.

 



 

Let us start from the following paint drying requests for steel by infrared quartz lamps.

Dear Sir, we are looking at Electric- Infrared Tubes (Explosion-Proof Type) 3.0m length x 0.4m width x 0.2m height for direct heating of painted steel plates from 26C to 80C inside a heating cabinet while the steel plates are moving at the speed of 1.5 ~ 2.5m/min. Power is 415V/3Ph/50Hz. The Paint Drying Cabinet Size: 3.2m Width x 9m Length x 1m Height with airflow of 290cu.m/min generated by centrifugal fan. Can you recommend the number of Infrared Tubes required to achieved 80C inside the cabinet based on the specified air-flow (exhausted out).

 

 



 

1: What is the heated object for the above request?

The painted steel plate.

 

2: What type of quartz infrared heating is good for the painted steel plate?

Steel materials absorb 0.76-2um infrared radiation better, so shortwave quartz infrared heating or Fast response mediumwave infrared heating are reasonable for meeting drying purpose.

 

3: How to distribute quart infrared heating for the steel coating drying?

The quartz lamps of infrared heating system are distributed along the running steel plate, installed on the upper and lower sides of the steel plate, or the left and right sides. The lamps of infrared heating system need to be divided into different heating groups and each heating group can be switched on and off and temperature controlled separately to meet the heating needs of different width steel plate.

 

4: What factors should be considered when designing lamp power?


Heating temperature, this is an important factor to design the heating power, and all quartz heating lamps should be controlled by PLC or SCR to adjust the heating temperature in the drying oven.
Coating thickness and plate thickness, more thicker plate needs more heating power and we should calculate the biggest thickness plate as an important factor.
Plate width, this will be an important factor to design the heating length of each quartz infrared lamp and width of heating lamps group.
Plate speed, this is an important design factor, we have to calculate the heating time from entrance to exit and meanwhile the heating temperature can be raised up in the heating time.
Plate color, different colors have different efficiency of infrared absorption. The darker the color, the higher the infrared absorption efficiency; the lighter the color, the lower the infrared absorption efficiency. Therefore, the color changes of the steel plate need to be considered in designing of lamp power.
air intake or exhaust flow, air into or out of drying oven will have a certain impact on the heating temperature, in order to make steel plate heating temperature more uniform, we need to consider this factor.
Other environmental factors, seasonal temperature changes, the heat preservation effect of drying oven.