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Application of laser in plastic product marking

Superwave Laser Technology Co.,Ltd | Updated: May 07, 2018

Plastic products often need to be permanently marked on plastic. Ultraviolet emission neodymium (355nm) solid-state lasers (such as the Coherent company's Avia laser) are ideal tools for marking various plastics such as PE, PP, ABS and PBT.

A low-pass laser can change the color of a common albino dye (such as TiO2) in plastics without changing the surface quality of the parts.

In the medical catheter and other small parts, the identification symbols such as barcode or alphanumeric characters must be clear, unbonded or indistinct. Because the catheter is exposed to bodily fluids, the mark must be non-toxic and not washed away by the body fluid.

Mechanical engraving marks cannot be used on medical catheters because the surface quality of the catheter is changed, and bacteria tend to congregate at the marker. But ultraviolet laser tags do not have such problems. The marked contrast of the laser "cold" process is obvious, and the edges are clear. Because ultraviolet light only affects photosensitive dyes, and does not affect the substrate carrying dye, uv light can produce high quality and consistent marks on a variety of plastics.

In addition, the output beam of a solid-state laser can be concentrated in a small spot diameter. Using a vector scanning technique, a reflector mounted on a computer-controlled galvanometer can move the beam to any position on the surface of the workpiece. Next, you can use CAD/CAM software to drill, cut or mark the plastic in a "straight" way. The inherent flexibility of the laser "soft tool" is the ideal method for continuous digital marking and drill hole drilling. High speed ammeter scanning system has the speed of digital and bar codes on all kinds of plastics higher than 100 words /s.

It is well known that before using micro precision drill for drilling machinery, drilling bit is easily damaged, and expensive, so laser instead complete on medical apparatus and instruments for precise micro processing tasks. As a result of uv, the solid-state laser is a "cold" technology, which is much smaller than the light spot of the infrared laser, so it is the best tool for microfabrication. The infrared laser will leave focal points and residual heat damage around the hole.

Neodymium: solid-state lasers are also used for high-density wiring of flexible circuit boards. This application requires the laser to have small feature resolution and high quality polyimide processing capability, which is not available for CO2 laser. As a result of ultraviolet neodymium: the solid state laser produces the residue or the amount of carbonization, so it is ideal to use it on the flexible circuit board that cannot be cleaned after processing.