Influence of laser marking machine process parameters on the marking effect of polypropylene plastics

Laser marking technology has developed rapidly in recent decades and is widely used in the field of plastic marking. Laser marking machine is to use laser to mark permanent marks on the surface of various substances. The principle is mainly to use a laser with a high energy density to irradiate the surface of the material, so that the surface of the material is vaporized to expose the deep substance, or under the action of light radiation, a chemical reaction that can change the color occurs on the surface of the material, leaving Permanent marking marks.

Polypropylene material is non-toxic and tasteless, has good processing performance, low density and light weight, high impact resistance, and can resist corrosion of various acids, alkalis and organic solvents. It has become the lightest general-purpose plastic and has a very wide range of applications in the industrial field. This paper mainly introduces the influence of laser marking machine process parameters on the marking effect of polypropylene plastics.

Through the experimental research on polypropylene plastic laser marking, we found that the process parameters of laser marking machine have the following effects on the marking effect of polypropylene plastic.

1. Laser power, marking frequency and marking speed are the main indicators that affect the laser marking effect of black polypropylene plastics. Too high power, too slow speed, and too high frequency will cause the surface of polypropylene plastic to scorch and turn yellow, the color of fonts will be uneven, the surface flatness will decrease, and the border of fonts will not be clear; Obviously, too fast speed and too low frequency will result in blurred and uneven fonts.

2. Marking line width, stack height and penetration depth will indirectly reflect the marking effect. If the three are too large or too small, they will have adverse effects on the marking effect. , in actual use, the three should be controlled within a reasonable range.

3. For polypropylene plastic laser marking, the best process parameters are 8W laser power, 2.0m/s marking speed, and 20KHZ marking frequency. When the line width is about 25μm, the stack height is about 25μm, and the penetration depth is about 23μm.

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