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The most common application method is electrostatic spray often called as "Corona" application. In the Tribo spray gun, an insulating material positively charges the powder particles via friction as the particles pass over it. Since these two processes use vastly different mechanisms to apply powder, it is not surprising there are many pros and cons with much to be considered. Electrostatic fluidization bed for powder coating machine slot. This type of powder coating is ideal for parts that need a thick, even layer but without a lot of details. As spraying time increases, the effect of powder output on the rate of film growth becomes less pronounced.
These factors are all covered in out troubleshooting guide. The downside is in the charging of the tank. Simply put, this issue is when the air is not penetrating the powder. Instead of applying an electric field, the tribo gun mechanically applies a charge directly to the powder particles. If it is the former, and you reclaim powder yourself, increase the percentage of virgin to reclaim. Application Methods for Thermoset Powder Coatings. In this method powder particles are charged by friction when they pass through a PTFE tube. Tribomatic charging is efficient in developing a static charge within the powder, however, coatings must be specifically formulated for this system. The ability to coat an entire rack of parts by a single dip into the coating tank can be very efficient.
Powder coating is less harmful to the environment than traditional wet spray painting because it produces lower VOC emissions. Troubleshooting guides should be utilized when inspecting or repairing any component within the electrostatic system to reduce the possibility of electric shock. Collected powder is then recycled, either automatically or manually, back to. Only one oven, spray parts cold. As exposure increases, the accumulation rate tends to become the same for all voltages, when using a corona discharge gun. Each system is custom designed for the best integration with your process. Electrostatic vs Fluid Bed Coating : Which One to Choose. This is one of the reasons why the Tribo spray gun is frequently used for automated processes. They can either be sandblasted and/or primed to increase the adhesion of the coating. Conditions should be maintained: - Fixed powder spray guns must be adequately grounded at their points of support, if metallic, to reduce the possibility of static charge buildup on the gun and the possible discharge of this static charge to a part or component in the spray area. The final coating thickness depends on the applied voltage. Steps: - Part pre-heated to 400°-450° F. - Initial deposit melts onto part. Manual powder spray gun operators must be adequately grounded (usually through the gun handle) to prevent the buildup of a static charge on the operator's body during spray operations. But one of its downfalls is that it's prone to corrosion, wear from oils in the human skin and diverse types of weather, and can be uncomfortable to hold. The powder is fed into the bell via compressed air.
All metal parts are cleaned to remove soil. Additional services include printing and decorating, assembly, packaging and die cutting and trimming. Include a few details about your process and we'll work to figure out the solutions. It is very rare for coating job shops, where flexibility is paramount, to have FDB coating capabilities.
Otherwise it will not pass through the application system and will not result in an evenly applied coating. That's why many industries turn to fluidized bed powder coating to provide a thick, substantial layer that offers excellent durability, resistance to wear and rust, and a more comfortable grip. Yes, Powder booths can go up in flames despite the lack of solvents used. ISO 9001:2008 certified manufacturer of plastisols, organisols & powdered vinyl for rotational & slush moldings, strippable, dip & spray coatings, fluidized bed & electrostatic sprays. We've coated a variety of parts including clips, springs, and hooks in this super-efficient method. This can happen in both fluid bed and electrostatic spray coating processes. Compressed air is then continuously pumped up through the membrane. As in any fluidized bed, the powder material is fluidized by introducing compressed air through a porous membrane into the powder bed. An ugly name for an ugly problem, right? Understanding Fluidized Bed Powder Coating | Products Finishing. Automatic PVC Dip Powder Coating Line Powder Dip Coating Painting System For Fence With Fluidized Bed. Extra beds are required for different powder types/colors. Rector: The drawbacks stem from the differences between fluid bed and electrostatic coating.
In manual spray guns, such as the one shown below on the left, compressed air is blown into the powder canister to stir the powder particles. The volume, size, and application of the part all play an important role in selecting the optimal processing method. So they perform better when trying to coat recesses or Faraday cages in objects.