The paint flow rate of a spraying robot is the amount of paint delivered to each spinner cup within a unit of time, also known as the spraying flow rate or paint output rate.

In addition to the spinneret speed, the paint flow rate also affects the fineness of the atomized particles. When all other parameters remain constant, a lower paint flow rate results in finer atomized particles, but it also leads to an increased solvent evaporation in the paint mist.

High paint flow rates in spray robots can result in wavy coatings. Additionally, when the paint flow is excessive and overloads the spin cup, the paint film at the edge of the spin cup thickens to a certain degree, causing the grooves on the spin cup to fail to distribute the paint, leading to layered paint skins. This can result in undesirable phenomena such as bubbles or uneven sizes of paint droplets.

The flow rate of paint for each spray gun on the robotic spray system is related to the diameter and speed of the high-speed spinning cup, as well as the density of the paint. Its upper limit is determined by the fineness of the atomization and the effectiveness of the electrostatic painting. Practical experience shows that the paint should be introduced at a constant speed, and fluctuations within a small range will not affect the quality of the coating.

During the actual spraying process, the area sprayed by each spinner cup varies, as does the flow rate of the paint. Additionally, due to the varying shapes of the objects being painted, the flow rate of the paint in the spinner cups must also change. Taking the spraying of an automotive body as an example, when spraying large areas like door panels, a greater amount of paint is ejected. However, when spraying door pillars and window pillars, less paint is ejected. Controlling the amount of paint ejected during the spraying process ensures uniform coating quality and film thickness, which is also a key measure for improving paint utilization.