The principle of laser plastic welding: The laser beam penetrates the upper layer of light-transmitting material and reaches the surface of the lower light-absorbing material. The laser light energy is converted into heat energy to melt the surface. At the same time, the heat is transferred from the bottom surface to the pressure-bonded material by conduction. The contact surface of the upper light-transmitting workpiece is melted, thereby realizing laser thermal welding. This has been extensively verified through various quality control methods during the welding process. After the narrow weld is cooled, it will be consistent with the strength of the material itself.
The necessary condition for a successful laser plastic welding process is that the two parts are laser transparent plastic and laser light absorbing material, which constitutes a variety of possibilities.
The method of laser plastic welding can produce welds with almost the same strength as the material itself, without generating debris or dust, and without introducing any chemical substances or other additives. The whole process is clean. The weld seam is from a few tenths of a millimeter to a few millimeters and has good sealing. Especially when a fine and beautiful weld structure is required, laser welding is undoubtedly the most ideal technology.
This technology has applications in many areas of medical engineering: for example, welding the shells of electronic components such as insulin devices or pacemakers. Cylindrical parts of catheters or pins can also be welded accurately and reliably with lasers, and ink cartridges and microfluidics used in diagnostic procedures can also be easily handled. Another advantage is that the weld has the same biocompatibility as the material itself. The various parts of the plastic valve that withstand high pressure can also be welded very well with laser, and it is very stable. Based on numerical control and precise laser beam, the system can easily weld any geometric shape.