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 Industry News |
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| The painting line environmental requirements |
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| Source：HuYou Industrial Release time：2011-02-25 |
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For the coating line of modernization, can meet the temperature, humidity and clean air (air dust content <10mg/m3) requirements; but for relatively simple coating production lines, it is difficult to guarantee constant temperature, constant humidity and clean air, so that the coating parts can not reach a good coating effect, easy to make the film the needle (shrinkage) hole, orange peel, particle film defects. In order to avoid the film the pinhole and orange peel, should first improve the spraying indoor temperature and humidity, the spraying indoor temperature and humidity to reach the process requirements; secondly, according to the different temperature and humidity adjusting the construction paint viscosity and diluent composition; control in the paint spraying chamber temperature must be below 35 ℃, humidity should be controlled below 80%.
In order to make the air dust content in the coating production line has been effectively controlled, should first improve the production line environmental conditions, will be separated from the polished, clean process and painting processes, to avoid grinding generated dust into the production line spraying room or drying (curing) furnace, eliminating grinding dust on the spraying effect; secondly, should be replaced the air filter regularly, ensure the dust in the air can effectively remove. In recent years, along with the stringent environmental requirements, waterborne coatings, high solid coatings, powder coatings and other environmentally friendly coatings obtained the rapid development. According to reports, powder coatings in China has reached annual production of 60000 T, after USA, Italy and Germany, ranked fourth in the world. Our country since 80, has introduced more than 500 powder coating production line, according to the current situation, it should be said has been basically reached saturation. Has become China's coating industry imminent topic and how to speed up the localization of powder coating equipment.
Coating production line waste gas, waste water pollution in general, waste residue and noise. At present our country coating production line waste gas from pretreatment, spray paint room, flow chamber, drying oven emissions, the emission of pollutants generally include the following; to photochemical smog formation of organic solvent, discharge the dust and paint mist coating volatile odor, thermal decomposition of reactants and reaction products, acid mist, shot peening of dust. Using no organic solvent or organic solvent with low content of coatings, is the most effective method to solve the organic solvent pollution, reduce the consumption of organic solvent, reducing the processing amount of organic waste gas, waste gas containing a high concentration of organic solvent treatment, take the diluted emissions into the atmosphere; organic waste gas for high concentration, wind the drying and curing furnace production line in the amount of emissions, typically used in combustion, catalytic combustion method, adsorption method for processing; low concentration, high flow rate gas spray chamber, before most of the use of paint mist flocculating or surface active agent, but now to promote the use of activated carbon adsorption method, and using activated carbon fiber bee wheel method for treatment of organic waste gas.
Wastewater mainly comes from the pretreatment of degreasing, phosphating, passivation of wastewater, cathode electrophoresis produced containing electrophoretic paint wastewater. Spray paint wastewater room and cleaning the water paint spray paint room, water circulating water regularly discharged. The general will all waste water in the basement according to the kind of wastewater were governance. The acid alkali wastewater by neutralization, sedimentation, filtration, emissions; containing 6 chromium (Cr6-) wastewater, using electrolysis and chemical reduction method for the treatment of wastewater; spray paint room, both waste water paint and solvent based paint, add flocculating agent for processing, paint slag is automatically discharge, wastewater treated, recycle, paint and other industrial waste slag off or away all together.
Waste is mainly produce paint slag, waste water treatment sediment, generally available plate and frame filter press and water quality, shipped to the special waste storage. The main noise source from the fan and transportation device, so we must use the fan and transport device noise requirements in the production line, the internal coating workshop installation of the best sound-absorbing material. The control system of coating production line along with the development and requirements of the control system has been improved, more and more reliable. So now control electric coating production lines are usually complex control, by the electrical control cabinet, but also all controlled by the center room, central control room and dry generally are equipped with the microcomputer, which can accurately control the drying and curing furnace temperature of each area, central control room can be set up TV monitor display, record the elevating temperature curve, also can set, modify the parameters, according to the size and coating color various pieces of different temperature adjustment. Bath by thermocouple control. At present, the painting production line all motors are usually equipped with double protection, and interlock with the main control, any electrical failure, control cabinet and the control room can alarm, if the equipment fails, all can shut down automatically, to ensure safe operation.
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