Development of a monitored and controlled laser beam process for surface pre-treatment of fiber-reinforced plastics (FRP) for adhesive bonding | Newslight #12 | ISF

At the research project, “ProKleb” the Welding and Joining Institute RWTH Aachen University (ISF) is developing in cooperation with Laserzentrum Hannover e.V. (LZH), a monitored and controlled laser beam pre-treatment process for PUR- and thermoplastic-based FRP. These materials are examined in detail:

  • polyamide, short fiber reinforced, injection part
  • high-performance thermoplastic (e.g. PEI, PPS, PEEK)
  • polypropylene
  • 2-component polyurethane, no fiber integration
  • 2-component polyurethane, with glass fiber reinforcement

The various process steps are shown in Figure 1. The process is divided into 3 steps, which are interconnected. In the first step, the geometry of any plastic component unknown to the process is examined using optical measurement technology. On the one hand, the exact contour of the component is to be recorded. In addition, in this process step, impurities on the component, such as release agents, are to be detected and locally assigned. The complete information is transmitted to the second process step, the laser system. Two different beam sources (NIR, UV) and their effects on the different plastics are investigated here. With the collected information from the first process step, the laser parameters such as distance to the component, power, line spacing, etc. are set. In the final step, the inline process controlling, the effects of the laser beam on the plastic material are investigated using pyrometry and spectrometry and their effects on adhesive bonding are evaluated. The ISF and the LZH are looking for further interested industrial partners who would like to join the “ProKleb” project. If you have any questions, please do not hesitate to contact us.

The IGF-project 19727 N, “ProKleb” of the research association “DVS German Welding Society” is funded within the framework of the industrial collective research programme (IGF) by the Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag.

Figure 1: “ProKleb” – Schematic view of the laser beam pre-treatment process