Key Technology - Laser Plastics Welding

Laser Plastics Welding

Basic Principle of Plastic Welding Using Laser. An upper layer material parts is transparent for the laser wavelength, while the other absorbs the laser energy are arranged to overlap, and when the laser beam is irradiated from above, the upper layer is transmitted. The laser-beam reaches the interface of the lower layer and raises the surface temperature of the lower base material. It can be summarized that the heat generated in this process is transferred to the upper layer and the two base materials are melted and joined.

In general, as a typical method for bonding plastics, a method using an adhesive, a method using friction heat of ultrasonic waves and vibration, a method using a hot plate, and a method for fastening a screw have been used.

However, despite their advantages, there was a demand for an alternative method due to disadvantages such as appearance quality problems, leakages, particle and lint generation, increase production cost , parts design restrictions and work environment problems, and low productivity.

Plastic welding technology using laser has advantages compared to the conventional plastic bonding method mentioned above. It has the characteristic that there are few restrictions on the installation space.

With the support of experienced laser experts, technical factors are thoroughly reviewed and reflected from the part design stage, so trial and error can be minimized by minimizing injection deformation and securing stable mass production quality. The important parameters to consider in order to successfully apply the laser plastic welding technology to the mass production are as follows.