Q: I run a small powder coating operation and we are having trouble with getting consistent results from our curing cycle. What are some of the things that might contribute to inconsistent quality?
There are a wide range of variables that might contribute to quality issues post-cure. Oven dwell time and air temperature are important factors in getting your parts up to cure temperature. Substrate type, thickness and configuration also play an important role because ultimately it is the temperature of the part itself that is most critical to achieving a proper cure for the powder coating. Keep in mind that in order to achieve the maximum physical properties and performance of the coating, it must be fully cured.
In simple terms, the equation for cure is as follows:
Temperature + Time = Cure.
In more technical terms, cure is the measure of the crosslinked oligomer chains to fully reach double bonds residing in the powder coating matrix following exposure to the curing process.
Paying attention to the cure window is crucial. If parts are not reaching the recommended cure window for the product it can lead to under-cure or over-cure of the powder coating.