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Fundamental studies on the interaction of laser radiation and paper regarding a joining process without filler material

: Lull, Florian; Zahel, Martin; Panzner, Michael; Schilling, T.


Klotzbach, Udo (Ed.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Laser-based Micro- and Nanoprocessing XV : 6-11 March 2021, Online Only, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11674)
ISBN: 978-1-5106-4183-9
ISBN: 978-1-5106-4184-6
Paper 1167407, 8 S.
Conference "Laser-Based Micro- and Nanoprocessing" <15, 2021, Online>
Fraunhofer IWS ()
materials processing; infrared spectroscopy; laser irradiation; thermal effects; gas to liquids; spectroscopy; structured optical fibers

This paper presents the results of fundamental studies on the interaction of laser radiation with classical paper materials regarding the melting of the main paper components cellulose, hemicellulose and lignin. Different papers were irradiated with the laser radiation of a carbon monoxide (CO) laser. Fluencedependent interaction regimes, the dynamics of the flash pyrolysis and chemical changes due to irradiation are discussed. Using a high-speed camera, a liquid intermediate state could be observed as a result of the irradiation. This is decomposed into gaseous reaction products by a highly dynamic boiling process. In addition to the time resolved investigations, extensive FTIR studies were performed.