Laser Marking Techniques for Medical Devices Made of Different Materials

This article focuses on the use of laser marking in the medical industry and explains how to set parameters for laser marking of metal and plastic materials.This includes the adjustment of power, the use of high molecular materials to prevent charring, and the use of depth control methods that meet medical standards.It also shared tips for daily maintenance of laser equipment, helping users to improve their yield and extend the life of their equipment.

Why does the material affect the laser marking?

Different materials react differently to lasers.For example, medical-grade stainless steel requires a higher-power continuous laser to produce a clear mark, while high-molecular-weight materials such as polycarbonate will scorch if the laser power is too high.It is suggested that you first try out the technique on scrap fabric to find a balance between producing a good color and not damaging the fabric.

Parameters for common medical materials.

Key points in handling metal surgical instruments.

For surgical instruments, stainless steel trays and other metal products, a 20-30W fiber laser is recommended, with the frequency set between 20-50kHz.Wiping the surface with alcohol prior to marking can effectively prevent the marks from turning gray.When taking pictures of objects with a strong reflective surface such as titanium, remember to turn on the red laser beam function to assist with focusing.

Precise marking of high-molecular materials.

For products like syringes and silicone tubing, he suggests using a UV laser with power controlled in the 3-5W range.During testing, the power is slowly increased from the lowest level, and when the material begins to change color, the test is stopped.In particular, it is important to note that the polyethylene used in IV bags will deform at temperatures over 120 ° C. It is best to use a pulse mode and mark in several passes.

The medical profession has special requirements.

The marking on medical devices must meet ISO 13485 standards, which means the depth of the marking must be controlled within the range of 0.01-0.03 mm.When scanning a curved object, a rotary fixture is used to keep the focal length constant.For instruments that need to be sterilized, after marking them, use a cotton swab dipped in alcohol to rub them repeatedly, to test the strength of the adhesion of the marking.

Tips on maintenance.

Every day before the machine goes on, the lenses are cleaned with a jet of air. Every month the filter on the water cooling unit is replaced.If the marking becomes faint, don't be too quick to adjust the power. First check if the focusing lens has been contaminated with metal dust.When the temperature is low in winter, remember to preheat the laser for half an hour before starting work.