I am not sure if everyone knows this little secret to consistent quality and production output. So if you do not do this currently, please do so and watch your production and quality soar! As most people in the finishing industry know, a clean part will most likely be a good part. So taking care of the pretreatment side of your process should be just as important to you and your quality people and should garner as much attention as the actual finish side!
That being said, there is another part to the finishing process that gets little or no attention, the RINSES. Rinsing is just as important and crucial to the quality of your finished part as the other two steps. I see shops that dump their rinses so infrequently that they look like a process tank in front or in back of them, seriously. DUMP them, flow them, keep them clean by any means possible! If you don’t maintain clean rinses, you will neutralize and/ or contaminate the tanks down line. Thus costing you time and money. I equate it this way: does your local car wash run your car through a dirty water rinse prior to drying? Do you have one side of your sink filled with dirty water to rinse your clean dishes in before you towel dry them? No, of course not Dan, that is crazy! Well, that is what I see finishers doing in shops everyday all around this Country. So, do not treat your parts any different than your car or your dinner dishes!
Dump your rinses often and flow them such that you always have a clean rinse prior to the next process tank. It will cut down on drag in and the contamination or neutralization of the following process tank. You can also minimze drag out/ drag in with a longer hang time or increase barrel rotation over each tank/station. You will save money in replenishment of those process tanks, get a better part/finish, and make more money!
Feel free to contact me about other ways to save money and increase production and quality.
Dan Dunigan, TFE