Basic Guide to Powder Coating OvensApril 29, 2016
We've approached the powder coating process from different angles, taken note of the durable nature of the finish and its environmentally-friendly aspects. Now, having described the electrostatic cycle, let's evaluate the end stage, the powder coating ovens that cure the powder. Designed as larger-than-life insulated chambers, the ovens evenly "bake" the coating in place. The goal is to ensure the pigments and resins in the technologically advanced particles uniformly harden, liquefy and then solidify as a shell-like skin across every square millimetre of an object's surface. Superior heating chambers, hot rooms that exhibit high-tolerance curing features are a necessary part of the work, which means airflow and temperature stability are must-have assets.
As a newly coated part rolls into the oven, the door closes snugly on a heavy-gauge steel chamber. The internal temperature now rises to a powder-baking 205°C (400°F), at which point powered fans maximize airflow, distributing the heat evenly throughout the sealed chamber. One issue that troubles the operation here is the energy consumption ratings of the equipment. For example, electric infrared variants deliver greater control than comparable convection oven models, but they use more energy. One solution is to combine both technological forms and create a hybrid oven. If the infrared stage misses obstructed surfaces, the convection section solves the issue by properly distributing the heat.
Load and Bake
The curing cycle begins with the loading of the object, a task that can cause big problems. Remember, powder coating ovens melt the particles and lock the resins in place but, at least until the curing work is concluded, only an electric charge is holding the particles in place. In other words, any sudden movement could shift the charged particles and compromise the finish during the loading phase. Of course, once the particles liquefy and bond, the powder coated object can be thrown around without damaging the finish. On returning to thermal controls, electronic circuitry, high-tolerance thermostats, keep burner temperature or infrared light intensity uniform, with the aforementioned convection currents efficiently delivering the heat to every corner of a geometrically complex object.
The above topic is discussed at a rudimentary level, so look for other systems components for more detail on powder coating ovens. Exhaust fans and atmospheric control systems, for example, deliver added control. Meanwhile, oven preheating stages can be wedged in front of the spray work as a means of burning away surface waste remnants, leaving the object naked and ready for the primary work stages.
GP Industries Pty Ltd
1 Regal Court,
Vermont South VIC 3133
Phone: (03) 9802 1355
Fax: (03) 9802 6027
20 Burgess Road,
Bayswater North VIC 3153
Phone: (03) 9761 7676
Fax: (03) 9761 7671
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