St. Louis: (314) 729-7000
or (800) 365-7565
Kansas City: (800) 365-7565
Springfield, MO:(800) 365-7565
With a flow meter tool. Click here to troubleshoot
Make sure that the part is properly grounded. The maximum resistance between the part and the earth ground should not exceed 1 megohm. Make sure the gun is producing high voltage. If the problem continues, try new or fresh powder.
Check your fluidization. The powder should appear to be “simmering”. Make sure that all o-rings and pump inserts are in good shape and that powder hoses are clean and clear. Confirm that the air supply is feeding the system with consistent and correct pressure (normally 100 to 120 psi). Check for possible blockage in check valves located on gun pumps.
Most UV shutdowns are caused by powder build-up on part fixtures or hangers, which causes arcing between the fixtures and the parts. The detection system sees this arcing and shuts down the system. Shutdowns can also be caused by non-grounded objects in the spray area, or by external sources, including operations near the booth.
Possible causes include an incorrect reclaim to virgin powder ratio, inconsistent air supply to the hopper, and changes in the environment, like humidity. All of these factors can influence fluidization. Due to a shift in particle size, new or virgin powder is easier to fluidize than powder that has been reclaimed. When new powder is first sprayed, more of the larger particles are transferred to the parts than the smaller ones, which is why reclaim powder has a smaller particle size distribution than virgin powder. The objective is to maintain a ratio that fluidizes and charges efficiently.
The ideal temperature for powder application is between 60 and 80 degrees Fahrenheit. Humidity should be kept between 40% – 60%.
Here are some pointers that may help lower your reject rate: