Explain how the three spray settings on a spray booth (spray, purge, and cure) differ in temperature, and why.

Question

What will be an ideal response?

Answer 1

When a spray booth has its spray temperature set at the ideal spray setting, that temperature will be 70°-80°F, depending on the manufacturer's recommendations. In the spray cycle, the air enters the booth and is vented outside. Then fresh air at the set temperature is passed through the booth. The movement of air draws overspray from the booth during finish application.
Purge Cycle: During the purge cycle the booth will draw in fresh air and maintain the proper temperature, which is often slightly higher than spray cycle temperatures,
allowing the booth to run in at this setting for a specific set amount of time. The air is vented outside the booth to eliminate any solvent accumulation as it evaporates from the freshly applied paint. The booth lights are generally on, and in some booths, the air supply to the wall transformer has been turned off.
Baking Cycle: The bake cycle can be set to come on after the purge time has elapsed. Its purpose is to change the booth environment to accelerate the cure cycle. Generally, the lights are switched off (because heat shortens the light bulbs' life expectancy). The
temperature is raised to the manufacturer-recommended cure temperature, approximately 120° to 140°F, for a set amount of time, again depending on the paint
manufacturer's recommendations (which may be from 840 minutes).