Why is the black material commonly used for the nozzle of the placement machine?

The SMT placement equipment has now become the mark of our fully automatic production line, and the SMT placement equipment can accurately and quickly place components all rely on the role of the nozzle. When we use the nozzle of the placement machine, we will definitely find that the nozzles are all black. Why should we use black nozzles?
To understand this problem, we must first know what role the nozzle has? The nozzle of the placement machine is not only the key part of the placement machine to pick and place the sucked component, but also the background when the camera of the optical vision system takes a picture. It mainly uses the suction effect of the vacuum to suck the component, and Use blowing to put the components adsorbed on the nozzle to the coordinate position of the circuit board. Almost every nozzle will have a reflective background, which is mainly to have a good background when the image is taken, so that the target information can be accurately highlighted during image processing. When the image is extracted, the nozzle serves as the background. Make the image contrast of the component enhanced and more clearly visible.

Take Yamaha YV100X Series Nozzle Core 71A, 72A, 73A, 74A, 76A, 79A as an example. When we use tungsten steel nozzles, we will find that although tungsten steel is particularly strong and durable, it will always turn white when used. At this time, when we place components, deviations will occur, resulting in missing parts. We just need to paint our whitening nozzle black with an oily pen. Why do we do this? In fact, for the image recognition system of the nozzle of the placement machine, black is not reflective, so that the components can be accurately identified. If the color of the nozzle changes to white or other colors, it is easy to reflect, so there will be deviations or errors after mounting.