Quartz Infrared Heat Lamp Manufacturer in China

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Infrared heating or hot air heating, which one is more efficient?

With the development of the times, science and technology are constantly advancing. In the industrial sector, efficient and energy-saving heating processes are undoubtedly pursued by the majority of manufacturing enterprises.

In this regard, the coating industry has increasingly stringent requirements for surface curing and drying in terms of speed and quality. Therefore, the coating drying process becomes crucial.

    Today, let’s briefly discuss the comparison between infrared heating technology and traditional hot air heating in the coating industry.

hot air heating   Traditionally, hot air furnaces are commonly used to transfer heat through the air medium. Since heating is achieved through convection, the air itself must be heated first, resulting in a slow heating process. However, if we switch to infrared heating, infrared radiation is utilized to heat objects by their absorption of the radiation, achieving heating without contact. This eliminates the need for any medium during the heating process, thus avoiding energy loss. Therefore, compared to traditional hot air furnaces, infrared heating effectively shortens the heating time.

To control the furnace temperature in a hot air furnace, the temperature of the entire air inside the furnace must be changed. Each time a product is changed, the hot air furnace can only slowly and laboriously achieve the required temperature curve or baking temperature again, as the furnace needs time to adjust to a new temperature. In contrast, infrared systems do not rely on contact media but transfer heat through infrared electromagnetic waves, allowing them to efficiently adjust to the desired temperature. This flexibility helps prevent overheating of the material being heated. Infrared heating technology also enables the rapid switching between different baking temperatures and types of paint.

      Traditional hot air heating conducts heat gradually from the surface of the heated object towards the interior, resulting in uneven temperature distribution within the object. In contrast, the penetrating ability of infrared radiation allows simultaneous heating of both the heated object and the surface coating. This results in a more uniform temperature distribution between the interior and surface of the heated object, thereby preventing surface peeling or blistering. As a result, the dried surface appears smooth and aesthetically pleasing, enhancing the quality of the surface coating.

We have a customer in the United States who, in the past, used the traditional heating method—hot air—for drying and curing resin paint on workpieces, relying on heat convection to heat the products. The traditional hot air circulating heating furnace mainly heats the workpieces through convection, transferring heat from the surface to the interior.

Last year, due to a major overhaul, our customer needed to shorten the drying line by two-thirds and also reduce the heating time by two-thirds to meet new production requirements. At this point, traditional hot air drying could no longer meet these demands. Later, they contacted us, and we provided a solution by converting the hot air drying furnace into an infrared heating drying furnace. The infrared heating drying furnace mainly relies on radiant heating, converting light energy into heat energy to raise the overall temperature of the products, thereby significantly improving the drying effect and reducing the time required.

Therefore, it can be seen that compared to hot air curing, the advantages of infrared curing are: Improved energy efficiency: In hot air circulation, heating the product requires heating the surrounding air first, whereas infrared heating does not require a heating medium. Heat is directly radiated onto the product, allowing the resin that needs to be cured to cure from the inside out.

  1. Improved resin curing quality: Traditional hot air circulation only accelerates the surface curing of the paint film and has little effect on the resin’s interior, leading to phenomena like “blistering” and “wrinkling.” Infrared curing, on the other hand, dries the resin from the inside out, overcoming these shortcomings.

  2. Shortened drying time: This drying method heats up quickly, drying the resin from the inside out in the same direction as solvent evaporation, thereby shortening the drying time. Statistics show that the curing time of resin under infrared radiation is about 1/2 to 1/5 of that under convection heating.

  3. High safety factor, improved working conditions, easy automation; quick start and stop, low thermal inertia, simple operation, and durability.

  4. It can be said that infrared drying is the most energy-efficient heating equipment when heating the surface layer of workpieces, saving more than 30% energy compared to hot air circulation heating. It is commonly used in automotive painting, coating drying and curing, packaging, printing, glass processing, papermaking, textile printing and dyeing, etc. Moreover, the temperature can be set and automatically adjusted. Due to the large energy transfer per unit area, it has a small footprint, saving space and construction costs. It can be connected to production lines, controlled synchronously, and reduces defects. The temperature can be controlled in segments to adapt to product requirements, offering high flexibility. 

Therefore, in industrial heating, infrared heating is an excellent method for saving time, money, and space.