Application of Biteman Modular-Units Dryer in Automobile Spraying






Automobile spray is the process of car painting. Generally speaking, it’s divided into three steps, first step, undercoat—the light car shell immerse into paint tank like syrup, and then take out and dry undercoat; second step, process painting—after that send into the dust-free workshop to do electrostatic painting ; final step, make up a layer of varnish, after drying using about 200 degrees temperature. So above have completed the entire car painting process.





In the automobile manufacturing, there are four important links: stamping, welding, painting (that is spraying), assembly. spraying process is the highest quality requirements for air source, it directly determines the quality of the body coating, which is the most vital step in the whole car production line. according to the international standard of compressed air (ISO / DP8573 / 1 standard), the air source quality of the coating equipment is required to reach solid particles level 1, water content level 2, oil content level 1, pressure dew point is below -40 ℃.



The coating process generally use air spraying method, the whole air spraying process consists of eight steps, first, the terminal end of the air compressor, followed by oil&water separator, pressure gauge and pressure controller, compressed air delivery pipes, paint storage tanks, compressed air delivery pipe, paint delivery pipe, spray guns. Every link is indispensable, and also need to coordinate with each other, only the entire coating process is running smoothly, will it not affect the quality of final product.






Automobile manufacturing has a strict standard for the compressed air in the coating part, that is, the coating will directly lead to quality defects if the gas source contains oil, water and other impurities. Common quality problems include shrinkage, bubble, pitting, etc.


It is difficult to eliminate in a short time, what’s worse, it lead to the production process can not be normal operated once produced shrinkage phenomenon. shrinkage refers to the coating process, the compressed air containing oil and water, resulting in local shrink, and it will be exposed or not exposed to the coating surface, forming pits, hemp Point and a series of paint defects, it not only affects appearance &quality of the coating, but also destroy the integrity of paint film. it can not be eliminated with ordinary grinding, polishing modification method.


Bubble will often occur with the shrinkage, that is, it will form shrinkage via paint film shrink after the bubble occurs and gradually disappear.


Pitting just like a crater on coating surface , do not reveal the hole of painted surface.





Compressed air quality can’t reach standard no matter whether it is shrinkage, bubble or pitting, and it will damage the normal use of equipment, directly increase product defect rate. while this is one of the major problems for automobile manufacturing enterprises.



Compressed air contain oil, water and other impurities, the solution is to add drying equipment in the whole automobile production line, that is adsorption dryer, and biteman modular-units dryer has an irreplaceable role in compressed air purification field in the actual application. for example, Changsha BYD Co., Ltd. purchased 3pcs biteman dryer in 2010, and purchased again to apply for technical transformation in 2012 and 2013; Xi'an BYD Auto Co., Ltd. Bought 1pc biteman dryer in 2013, and bought 8pcs again to apply it into new project in 2014 due to perfect drying effect. the product's defect rate significantly reduced, shrinkage, bubbles, pitting and other issues have also been significantly improved after using biteman modular-units dryer.















It undoubtedly is the most important to do automotive spraying during the process of entire automotive manufacturing, it has the highest quality requirements for the compressed air. Therefore, biteman is a good choice if greatly reduce the quality issue of the spraying process, reduce the quality defect affecting entire production line for enterprises who want to improve.

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