What kind of laser source is suitable for FPC/flexible board laser cutting machine?

The soft board we are talking about here is the abbreviation of FPC flexible circuit board, also known as flexible circuit board. Compared with hard board PCB circuit board, soft board has the advantages of high wiring density, light weight, thin thickness, small wiring space restriction and high flexibility. Today we will introduce Soft board laser cutting machine.

Currently, in the field of circuit boards, laser cutting mainly includes CO2 laser, ultraviolet laser, infrared fiber and green light. But why is ultraviolet laser processing the first choice for soft board laser cutting? This is due to the differences in its wavelength, thermal effect and processing accuracy.

The wavelength of CO2 laser is 10.6渭m, and the spot is large. Although the processing cost is relatively low and the laser power can reach several kilowatts, a large amount of heat energy is generated during the cutting process, resulting in heat loss and severe carbonization of the processing edge.

Infrared fiber uses 1064nm band laser, and green light uses 532nm band laser. Infrared fiber can achieve greater power and greater thermal impact. Compared with fiber laser, green light is slightly better and has less thermal impact. UV laser is a processing method that destroys the molecular bonds of materials and has the least thermal impact. This is also the reason why in the process of cutting non-metallic circuit boards, green light processing will have slight carbonization, while UV laser can achieve small carbonization or even no carbonization at all.

The wavelength of UV laser is 355nm, with convenient optical focusing and fine spot. After laser focusing, the laser power with a diameter of less than 20 watts is only 20渭m, and the energy density generated is even comparable to that of the sun's surface, without obvious thermal impact. The cutting edge is clean and tidy, and the effect is better and more accurate.

Therefore, UV laser processing has high-precision processing effects, coupled with its flexible cold light processing method and flexible and controllable processing technology, it has become the best choice for FPC soft board laser cutting.