How can I shorten the pretreatment time for my batch powder painting operation?
Q. I have seven tanks in the pretreatment process I use for my batch powder painting operation:
6. Zinc phosphate
Can you please give me some advice on how I can shorten my pretreatment time?—L.M.
A. Unfortunately, what you have listed are the minimum steps that are necessary for a conversion coating. Possibly, the segment that offers any possibility to shorten the overall cycle would be if you could eliminate the de-rusting step. This would only be possible if you could control and eliminate the rust from your upstream manufacturing process. First examine the incoming parts or sheet material. Are they coming in the door rusted? If so, can you work with your suppliers to change this or have them perform the de-rusting before you receive the parts? If the rust is occurring within your manufacturing process, you can work to eliminate it through the use of in-house light oils or indoor corrosion inhibitors and reducing the amount of in-process time the parts are allowed to sit between processing steps.
This alternative to TGIC-based polyester powder coatings offers similar performance and enhanced transfer efficiencies.
For more than 50 years, fluidized beds have been used to coat parts with powder coatings. In this article, two industry experts tackle some common questions about the fluidized bed process…
Question: What methods are available for removing cured powder coatings, and what are the pros and cons of these methods?