By design, powder objects are thermally reactive, meaning that they change when subjected to heat. For you to have quality end products, you must have a well-designed, functional, and maintained oven. The powder coating oven provides the heat required to change the powder particles from their initial state to a solid thermosetting product. The most common types of curing ovens include electric heat, infrared, and natural gas convection heat. Each type has its merits and demerits. Therefore, it is the painter to choose the oven that he/she can afford and that which suits his/her needs. When using the powder coating oven, you need to ensure the following factors if you need quality output.
Proper air flow: When adjusting the oven, consider the velocity and direction of the air. Calculate the size of the re-circulating blower to ensure proper direction and flow of air.
Even heat distribution: This is mandatory to ensure that the parts receive the same temperature levels for the allocated time. To achieve this, you can adjust the distance of the opening between the louvers in the oven. Adjusting the distance changes the atmospheric temperature in the oven and redirects the flow of air to certain areas.
Constantly clean the burner air or oven intake: This is necessary to prevent contamination from getting into the heated air vents on the oven walls. Most companies are now distributing curing ovens with filtration devices in the air intake system to reduce contamination problems. Contaminants can be circulated in the oven and be embedded in the final product, thus lowering the quality.
Ensure that the workplace is tidy: If the workplace is contaminated, it is possible that the oven, powder hopper, collector system, and the spray booth will be contaminated with the same substance. A workplace has a myriad of activities going on. These activities involve air movement. If the air contains dust, hair, or lint, it is possible to find these contaminants on the final product. Therefore, keeping your workplace tidy is not optional if you want quality output.
Keep clean records of maintenance tasks: Maintenance tasks include motor replacement or repair, oven adjustments, filter changes, and oven calibration. These tasks should be recorded in a maintenance book. These records will help the system manager to note the trends and closely monitor the changes that will affect the quality of the product. The powder coating ovens require much maintenance compared to other equipment.
Electric powder coating oven: The electric powder coat oven can be ranked as the best curing oven. As the name suggests, it uses electric power to heat the powder particles. These ovens make efficient use of the space available. With this oven, you do not need to worry about even heat distribution as it has wall-mounted elements that ensure even heating of the oven’s interior. The electric curing oven is designed for efficient batch powder curing without regular product throughput. Its multi-function design makes it the best option for most painters.
To ensure emergency egress, the oven doors have a positive latching appliance which secures one of the doors to the floor and frontal header and allows the other door to fasten to it friction (panic) latches. The doors also have siliconized rubber gasket of fiberglass material to reduce heat loss. The control panel of the oven contains several safety devices such as visual and audible alarms. The main disadvantage of this type of oven is it is costly to purchase and maintain. Other ovens heat the powder particles with infrared emitters.