I have recently been doing some research into the current methods used to clean conveyor chains and “I” beams for the prevention of dirt falling onto parts. I came across an abstract referring to a report released in the June 1999 Painting Clinic. I am currently working for a company in Australia, which manufactures play gyms for children, so surface condition and quality is our highest concern. I imagine you would be aware of the frustration with quality and production losses resulting from the dirt falling onto parts post-pretreatment and was wondering how I could obtain a copy of that report or specifically, that chapter? Thanks. P. M.
The article you referenced in the June Painting Clinic was a Question from M. D., titled “DIRT PROBLEMS." It was about dirt falling on plastic parts during the painting operation. My answer was: “Positive steps must be taken to eliminate dirt from falling on painted parts. Most of the dirt is from airborne contamination. The contaminants are drawn into the spray booth with make-up air. To completely eliminate these contaminants, the spray booth must be fully enclosed and the make-up must be air filtered. I have said before in this column that airborne contaminants can travel hundreds of feet in a factory. Another source of dirt is the conveyor. This can be corrected by using chain cleaners. The last but not least source of dirt is the paint itself. Paint should be filtered while pumping or pouring from shipping containers. There should also be filters in the line from the paint supply to the spray gun.”
On the other hand, your problem seems to be dirt falling from the conveyor chain after pretreatment. Residual dirt and scale can be removed from conveyor chains by using chain cleaners that employ air or water blasts, heat, rotating brushes and other mechanical means.