Nowadays, automotive products are very common and have achieved astonishing sales figures. The European Automobile Manufacturers' Association (ACEA) report states that global car sales will reach approximately 74.6 million units in 2024. The automotive industry is one of the important application industries for dehumidifiers. Humidity control directly affects the quality and production efficiency of automotive products in production, spraying, assembly, testing, and other processes.

 

Why does the automotive industry need dehumidifiers?

The automobile manufacturing process involves a large number of metal processing, painting, electrical control, and material curing processes, all of which are sensitive to humidity:

Prevent corrosion of metal components

Car parts are mostly made of steel, aluminum alloy, galvanized parts, etc., and high air humidity can easily oxidize and rust.

Especially in welding workshops and storage areas, if the humidity exceeds 60% RH, the corrosion rate will significantly increase.

Ensure the quality of painting and coating

The car painting process is extremely sensitive to humidity.

Excessive humidity can cause blistering, loss of gloss, and poor adhesion on the paint surface.

Low humidity can cause static electricity accumulation, leading to uneven spraying.

Therefore, the paint spraying workshop is usually controlled at 45% to 60% RH, using a constant temperature and humidity dehumidifier or desiccant dehumidification system.

Ensure the curing performance of composite materials and adhesives

Carbon fiber, resin, polyurethane adhesive, and other materials are widely used for automotive lightweighting.

Excessive humidity can lead to incomplete curing, decreased strength, and even delamination.

Low dew point industrial dehumidifiers (such as desiccant dehumidifiers) are commonly used in solidification workshops, maintained at 30-45% RH.

Protecting electronic and electrical systems

There are numerous electronic control units (ECUs), sensors, and onboard chips in modern cars.

The assembly and testing environment should be kept dry to prevent moisture and short circuits.

The common humidity control range is 35-50% RH.

Component storage and finished product warehouse management

Automotive parts and molds also need to be rust and moisture-resistant during storage.

Large warehouses typically use ducted or ceiling-mounted industrial dehumidifiers to maintain 40-55% RH.

 

Typical application scenarios of dehumidifiers

 

Dehumidification Practical Cases

Toyota car spray painting workshop: adopts a constant temperature and humidity system, with humidity controlled at 50 ± 5% RH to prevent paint bubbles and color differences.

Tesla battery assembly room: uses a low dew point dehumidification system (dew point as low as -20 ℃) to prevent lithium battery materials from absorbing moisture.

BMW parts storage center: equipped with ceiling-mounted industrial dehumidifiers, maintained at 45% RH for a long time to prevent oxidation of molds and parts.

 

Summary 

Industrial dehumidifiers are not only environmental improvement equipment in automobile manufacturing, but also important equipment for ensuring product quality, production stability, and material safety.

Main function:

Prevent corrosion and mold growth

Improve the quality of painting and bonding

Ensure the stability of electronic components

Extend the lifespan of equipment and components

 

Preair provides high-performance dehumidifier products and dehumidification systems. Our R&D team excels in designing refrigerant dehumidifiers based on actual needs. These machines can operate continuously in the temperature range of 5-38 ℃ and the humidity range of 10-90%, meeting the dehumidification needs of welding, spraying, assembly workshops, and warehouses. If professionals in the automotive industry happen to come across this article, please contact us to discuss new dehumidification solutions.