The workpiece is immersed in the bath, to be removed after treatment for a period of time, to complete a common treatment methods in addition to oil or rust phosphating and other targets, the geometry of the workpiece character is different, as long as the liquid can reach the place, can achieve the treatment goals, this is the unique advantages of soaking, spraying, brushing is cannot compare. Its shortcomings, is not the use of auxiliary mechanical erosion, so the processing speed is relatively slow, long treatment time, especially as a continuous suspension conveying workpiece, workpiece running time except in the groove, and the downslope time the workpiece, so that the equipment growth, site area and investment increase. Only on the phosphating, at present the foreign comparative tend to use the full immersion mode.
 

Soak spraying, all is the same bath. This combination keeps the spray efficiency, improve processing speed, but also has the soaking process, so that all parts of the workpiece can be treated effectively. So the spray - Immersion combined pretreatment can complete the treatment process in a relatively short period of time, the equipment occupation area is relatively small, the treatment effect and can obtain satisfactory. At present, higher requirements for pretreatment of the automotive industry, generally tend to take shower soaked combination mode.
 

In order to save energy, spray chamber model adopted effective energy-saving measures. Again is a drying room energy-saving measures, the drying chamber is the main energy consumption are painting workshop. In order to save energy in drying, paint shop has gradually advanced to the drying chamber was reformed, adopted new technology and energy saving. In the coating line of new overseas in recent years, supplementary fresh air to the coating and topcoat drying room, has also tends to offer by the rear coating and topcoat drying room cool dry air discharged waste area. This approach not only deal with part of the exhaust air volume, reduce the pollution of the environment, and reduce plant winter work of mine ventilation system when the heat consumption, achieves the purpose of saving energy.