plating, anodizing, & finishing Q&As since 1989
Using reclaimed powder mixed with virgin powder
When using old reclaimed powder paint what would be a good ratio for mixing reclaimed powder with virgin powder?
Our gloss specification is 20 @ 80 gloss and 60 degree at 90 gloss. The 60 reads ok while the twenty is anywhere from 50 to 70 gloss (most generally 70). We have tried 50:50, 3:1 and 4:1.William M. Mathes
industrial painting - Burlington, Iowa
Q. What is percentage of recycle powder can mixed with virgin powder in semi glossy finish powder application.Prakash MANI
POWDER MANUFACTURING - Bangalore, India
September 19, 2012
A. The general rule of thumb is no more than 1 part reclaim to 3 parts virgin powder.
Thus: the importance of first pass transfer efficiency.
The actual ratio really does depend on specifics of your plant however.
If you are reclaiming from Cyclone Recovery the powder particles will have been degraded by impact if you are recovering from cartridge filter systems, perhaps less so.
The best answer is to minimise your reclaim by improving your first pass transfer efficiency.
Hope this helps.
Trainer - Salamander Bay, Australia
A. Mr Doherty is correct. That is the "general" rule of thumb but other factors play part in this equation such as whether or not the powder is say texture. Some textures require much higher virgin mix so the texture matches. Theres more to consider than just color and gloss here. That means you might have to have a 50/50 mix. You will just have to try it and check the substrate when finished to see of it meets and matches your specifications. My opinion is that it's better to lean on the side of too much virgin rather than too little because as Mr. Doherty mentioned, first pass transfer efficiency is everything.
November 8, 2012
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