Details
| Original language | English |
|---|---|
| Article number | 042051 |
| Number of pages | 6 |
| Journal | Journal of laser applications |
| Volume | 33 |
| Issue number | 4 |
| Early online date | 11 Nov 2021 |
| Publication status | Published - Nov 2021 |
| Externally published | Yes |
Abstract
Adhesive bonding of plastic components is a well-established process for various applications. Specifically for thermoplastic parts, surface pre-treatment is required to achieve optimum bonding quality. However, automated surface pre-treatment is not established yet. Reasons are missing process monitoring and significant challenges arising from conventional monitoring techniques that hardly identify surface contaminants. In a recent research project, the authors investigated how process monitoring by spectrometry during a laser-based surface pre-treatment might solve this challenge for fiber-reinforced plastics and generic surface contaminants. This article describes experiments conducted on two composite materials with different contaminants. A nanosecond-pulsed UV-laser was used to pretreat a glass-fiber reinforced 2C-polyurethane (GF-PUR) and a glass-fiber reinforced polyamide 6 (GF-PA6). Each composite had coupons contaminated with an industry standard mould release agent or artificial silicate-based dust as well as uncontaminated samples. The samples were laser pretreated and compared to reference coupons that did not receive laser treatment. The samples were analyzed after laser pre-treatment for their free surface energies by the detection of the contact angle and measured for the surface roughness. The bonding improvement due to the laser process was determined by shear strength and peel resistance tests. The results show that UV-laser pre-treatment has an advantageous impact on the bonding strength of GF-PUR and GF-PA6. Combined with a fast spectrometric process monitoring that robustly identifies contaminants during the laser process, an inline process control is feasible.
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
- Engineering(all)
- Biomedical Engineering
- Physics and Astronomy(all)
- Instrumentation
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In: Journal of laser applications, Vol. 33, No. 4, 042051, 11.2021.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Individualized and controlled laser beam pre-treatment process for adhesive bonding of fiber-reinforced plastics. III. Effects of contaminants
AU - Dittmar, Hagen
AU - Beier, Christoph J.A.
AU - Weiland, Josef
AU - Schiebahn, Alexander
AU - Jaeschke, Peter
AU - Kaierle, Stefan
AU - Reisgen, Uwe
AU - Overmeyer, Ludger
N1 - Funding Information: The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The IGF-project 19727, “Prozessbeobachtung und -regelung der Klebvorbereitung PUR-und thermoplastbasierter, faserverstärkter Kunststoffe mittels Laser—ProKleb” of the research association “DVS German Welding Society” was funded within the framework of the industrial collective research program (IGF) by the Federal Ministry for Economic Affairs and Energy on the basis of a decision by the German Bundestag. The authors would like to express their gratitude toward Coherent, Inc. and C. Meyer for providing the AVIA NX used in the experiments. They also thank T. Engels at Henkel AG & Co. KGaA for providing the materials and O. Lischtschenko at Ocean Optics BV for his continuous support with regard to spectrometry.
PY - 2021/11
Y1 - 2021/11
N2 - Adhesive bonding of plastic components is a well-established process for various applications. Specifically for thermoplastic parts, surface pre-treatment is required to achieve optimum bonding quality. However, automated surface pre-treatment is not established yet. Reasons are missing process monitoring and significant challenges arising from conventional monitoring techniques that hardly identify surface contaminants. In a recent research project, the authors investigated how process monitoring by spectrometry during a laser-based surface pre-treatment might solve this challenge for fiber-reinforced plastics and generic surface contaminants. This article describes experiments conducted on two composite materials with different contaminants. A nanosecond-pulsed UV-laser was used to pretreat a glass-fiber reinforced 2C-polyurethane (GF-PUR) and a glass-fiber reinforced polyamide 6 (GF-PA6). Each composite had coupons contaminated with an industry standard mould release agent or artificial silicate-based dust as well as uncontaminated samples. The samples were laser pretreated and compared to reference coupons that did not receive laser treatment. The samples were analyzed after laser pre-treatment for their free surface energies by the detection of the contact angle and measured for the surface roughness. The bonding improvement due to the laser process was determined by shear strength and peel resistance tests. The results show that UV-laser pre-treatment has an advantageous impact on the bonding strength of GF-PUR and GF-PA6. Combined with a fast spectrometric process monitoring that robustly identifies contaminants during the laser process, an inline process control is feasible.
AB - Adhesive bonding of plastic components is a well-established process for various applications. Specifically for thermoplastic parts, surface pre-treatment is required to achieve optimum bonding quality. However, automated surface pre-treatment is not established yet. Reasons are missing process monitoring and significant challenges arising from conventional monitoring techniques that hardly identify surface contaminants. In a recent research project, the authors investigated how process monitoring by spectrometry during a laser-based surface pre-treatment might solve this challenge for fiber-reinforced plastics and generic surface contaminants. This article describes experiments conducted on two composite materials with different contaminants. A nanosecond-pulsed UV-laser was used to pretreat a glass-fiber reinforced 2C-polyurethane (GF-PUR) and a glass-fiber reinforced polyamide 6 (GF-PA6). Each composite had coupons contaminated with an industry standard mould release agent or artificial silicate-based dust as well as uncontaminated samples. The samples were laser pretreated and compared to reference coupons that did not receive laser treatment. The samples were analyzed after laser pre-treatment for their free surface energies by the detection of the contact angle and measured for the surface roughness. The bonding improvement due to the laser process was determined by shear strength and peel resistance tests. The results show that UV-laser pre-treatment has an advantageous impact on the bonding strength of GF-PUR and GF-PA6. Combined with a fast spectrometric process monitoring that robustly identifies contaminants during the laser process, an inline process control is feasible.
UR - http://www.scopus.com/inward/record.url?scp=85119371286&partnerID=8YFLogxK
U2 - 10.2351/7.0000466
DO - 10.2351/7.0000466
M3 - Article
AN - SCOPUS:85119371286
VL - 33
JO - Journal of laser applications
JF - Journal of laser applications
SN - 1042-346X
IS - 4
M1 - 042051
ER -