Process Data for Efficient Laser Beam Pre-treatment of Fiber-reinforced Plastics for Adhesive Bonding
13th European Adhesion Conference (EURADH)
For a stable adhesive bond of fiber-reinforced plastics, a surface pre-treatment is necessary . A process that detects contamination and based on that pre-treats the surface is missing for industrial applications. Therefore, a monitored and controlled laser beam pre-treatment process has been developed. A schematic view of the process is shown in figure 1. In a first step, the component’s surface is recorded by a line scan camera system. Position of the component and the bonding areas are detected and scanned for contaminations. With this information, the laser control defines a program in which areas with detected contaminations are treated with cleaning parameters to remove the contaminations. Areas without contaminations are treated with a pre-treatment parameter. The cleaning and treatment process is monitored by spectrometry. The spectrometrical data is analyzed for characteristic peaks of contaminations. When contamination peaks are detected, the cleaning process is repeated in the respective area. If different contaminations are known and expected, different parameter sets can be applied for the different contaminations. The pre-treatment process was investigated on glass fiber reinforced Polyamid 6 (PA6) and the functionality of the process was proven. The effectivity of the pre-treatment process was evaluated in tensile lap shear tests, bonded with a 2C-Polyurethane (3M SW DP609). A comparison of achieved tensile shear strengths is shown in figure 2.