Process for the spray application of aqueous paints by controlling the temperature of the air in the paint spray zone

摘要

The process is directed towards an improvement in the application of an aqueous paint to a substrate by air spraying the paint with a spray gun utilizing atomizing air at a flow rate of about 5-40 cubic feet per minute at an air pressure of 30-95 pounds per square inch at the spray gun and paint flow rate of about 5-30 ounces per minute, wherein the air atomized paint is applied to the substrate and baked to form a uniform finish on the substrate; THE IMPROVEMENT THAT IS USED WITH THIS PROCESS COMPRISES SPRAYING ATOMIZED PAINT IN AN ATMOSPHERE THAT IS CONTROLLED AT A TEMPERATURE OF ABOUT 15 DEG -40 DEG C. and at such a relative humidity that the air has a drive force value with the range of 0.002 to 0.004 humidity units (pounds of water/pound of dry air) which is constantly maintained at a set value within this range to initially dry the paint at a uniform rate to form a finish that has a uniform appearance after being baked; THE IMPROVED PROCESS IS PARTICULARLY USEFUL FOR APPLYING AN EXTERIOR AQUEOUS FINISH ON AUTOMOBILE AND TRUCK BODIES TO FORM A HIGH QUALITY FINISH OF UNIFORM COLOR, HUE AND APPEARANCE.