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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Poster

K 4.9: Poster

Dienstag, 10. März 2020, 16:30–18:30, f428

Correlation between lasers induced carbonization and LIBS on leather — •Dominic Bergmeister¹, Alexander Feist², Ali Hachimi², Mareike Schäfer², Johannes L'huillier², and Peter Schultheis¹ — ¹Prüf- und Forschungsinstitut Pirmasens e.V., 66953 Pirmasens, Germany — ²Photonik-Zentrum Kaiserslautern e.V. and Research Center OPTIMAS, 67633 Kaiserslautern, Germany

The industry 4.0 sets the shoe industry for great challenges, automation is due to the large use of leather very problematic. To bond leather to the sole, it is necessary to remove the finish from leather. In shoe industry this roughening process is still often done by hand. Investigations showed the potential of ultra-short pulse lasers for the roughening process. However, it is required to adapt the laser parameters to the respective leather type in order to avoid carbonization on the surface, which reduce the adhesive strength. Our approach is to regulate the laser output power, which is critical for the carbonization, through laser induced breakdown spectroscopy (LIBS). Due to the thermal process of the carbonization during laser processing of leather, it is possible to detect the broad emission spectrum by LIBS. To establish a control, it is necessary to correlate the spectra with the carbonization. For this, the carbonization is also quantified with a sample speckled on the processed leather area and analyzed of residue on the surface. The results show the correlation between the spectrum, the speckle tests and the adhesive tests on leather according to DIN 1392. Based on these results we are able to establish an automatic control for the laser processing of leather samples.