To initiate atomization, we need to ensure that each spray gun has ample air supply. But before we start adjusting the air pressure settings, it is important to understand that the preferred adhesive yield and spray pattern width determine the air pressure needed (PSI/Bar). Applications that require low adhesive volume in a small spray pattern call for low air pressure, whereas high volume applications in a wide spray pattern require higher air pressure. Usually, high air pressure results in more overspray pollution.
The correct spray pattern must be wide enough to handle a part of substrate, but not too wide to avoid overspray. By adjusting the width setting on your spray gun, you can adjust between a wide or a round/narrow spray pattern. The spray pattern directly depends on the air pressure. When increasing the width, you may also need increase the pressure.