On small parts such as medical catheters, identification marks such as bar codes or letters and numbers must have clear edges and no signs of adhesion or ambiguity. Since medical catheters fight with body fluids, the marks must be non-toxic and will not be washed and erased by body fluids.
The marks engraved by the machine cannot be used on medical catheters. Because the appearance and quality of the catheters are changed, bacteria are easy to gather at the marks, but the UV laser marking does not have such a problem. The marks made by the laser "cold" process are relatively obvious, and the edges are clear. Because the UV light only affects the dye of the photosensitive laser marking machine, but does not affect the substrate carrying the dye, the UV light can be naturally high-quality on a variety of plastics, Marking of equivalence.
The solid-state laser is a "cold" process, and its spot diameter is much smaller than that of the infrared laser, so it is the best thing for micromachining. The infrared laser will leave thermal damage such as focal points and residues around the borehole.
Solid state lasers are also used to drill through wire holes for high-density wiring of flexible circuit boards. This application requires that lasers have small characteristic discrimination and ultra-high quality polyimide processing ability. Fiber laser marking machines do not have these effects. Because UV neodymium: solid state lasers produce less residue or carbonization, Therefore, it is the most ambitious to use it for small processing on flexible circuit boards that cannot be washed after processing.
Core technical principles of conventional laser marking machines.
According to different lasers, laser marking machines can be divided into semiconductor laser marking machines, CO2 laser marking machines, optical fiber laser marking machines, etc. They have different marking effects according to different marking materials. Generally speaking, semiconductor and optical fiber laser marking machines are suitable for marking metal, plastic and other materials. CO2 laser is mainly aimed at non-metallic materials, typical applications such as acrylic, transparent plastic, ceramic, Laser marking of glass, etc.
Pneumatic marking machine is also known as industrial pneumatic lettering, pneumatic marking machine, metal lettering machine, etc. Its marking principle is that the computer controls the marking needle to move in the X and Y axis two-dimensional plane according to the specified trajectory, while the marking needle of the ultraviolet laser marking machine does high-frequency impact movement under the action of compressed air, so as to print permanent concave marks with a certain depth on the workpiece, the ultraviolet laser marking machine.