Page 36 - InnoRenew CoE International Conference 2020, Integrating Sustainability and Health in Buildings
P. 36
ical and abrasion properties of plasma treated and UV LED printed wood
samples
Gregor Lavrič1, Jure Žigon2, Sebastian Dahle3, Igor Karlovits4, Urška Kavčič5
1 Pulp and Paper Institute, gregor.lavric@icp-lj.si
2 Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, jure.zigon@bf.uni-lj.si
3 Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, sebastian.dahle@bf.uni-lj.si
4 Pulp and Paper Institute, igor.karlovits@icp-lj.si
5 Pulp and Paper Institute, urska.kavcic@icp-lj.si
UV LED printing technology can be used for printing directly on wood, which enables new
options for unique printed wooden elements in the interior and exterior design. With appropriate
design and processing technology, all kinds of wood samples and end products (doors, furniture
elements) can be enriched and their added value can be raised. Depending on the application’s
end use, a pre- or post-treatment may be required to improve ink adhesion and durability.
Plasma treatments are a common procedure to improve the performance of coatings and
adhesives on various substrate materials. Particularly on wood, air plasma treatments are known
to improve adhesion strength and durability of many types of lacquers and varnishes (Žigon et
al., 2018). In some cases, air plasmas were even found to be a suitable replacement for parts
of the conventional pretreatments, such as the last step of sanding before applying the coating
(Wolkenhauer et al., 2009). In other cases, chemical primers could be excluded altogether on
plasma pretreated substrates (Viöl et al., 2012).
In this research, Common beech (Fagus sylvatica L.) wood samples were printed using flatbed
UV LED inkjet system (Apex 1610) with Nazdar UV inks. Half of the specimens were pretreated
using a dielectric barrier discharge (DBD) plasma in atmospheric air (Žigon et al., 2019). To
determine the influence of the DBD pretreatment print gloss, print sharpness and abrasion
resistance of the printed samples were measured. Print gloss was measured on the 100 %
covered printed black area with Novo Gloss Trigloss Gloss Meter (RHOPOINT) at 20, 65 and 85 °
gloss angles. The results indicate no significant changes regarding specular reflections after the
DBD pretreatment. Print sharpness as a surface quality factor was determined with modulation
transfer function (MTF) using ImageJ, an open source image processing program. The results
of abrasion resistance obtained with Taber Abraser didn’t show significant difference, either.
Based on these results, it can be concluded that DBD pretreatment did not have a significant
impact on printing properties of Common beech wood samples printed with UV inkjet.
Keywords: UV LED, printing, plasma treatment, gloss, abrasion resistance
Acknowledgements: The authors gratefully acknowledge the European Commission for funding
the InnoRenew project (Grant Agreement #739574) under the H2020 Widespread-Teaming
programme and the Republic of Slovenia for European Regional Development Fund financing.
REFERENCES
Viöl, W., Avramidis, G., Militz, H., 2012. Plasma treatment of wood. In: Handbook of Wood Chemistry and Wood
Composites. Ed. Rowell, R.M. second edition. CRC Press, Boca Raton. pp. 627–658.
Wolkenhauer, A., Avramidis, G., Hauswald, E., Militz, H., Viöl, W., 2009. Sanding vs. plasma treatment of aged
wood: A comparison with respect to surface energy. Int. J. Adhes. Adhes. 29, 18–22. https://doi.org/10.1016/j.
ijadhadh.2007.11.001
Žigon, J., Petrič, M., Dahle, S., 2018. Dielectric barrier discharge (DBD) plasma pretreatment of lignocellulosic
materials in air at atmospheric pressure for their improved wettability: a literature review. Holzforschung 72, 979–
991. https://doi.org/10.1515/hf-2017-0207
Žigon, J., Petrič, M., Dahle, S., 2019. Artificially aged spruce and beech wood surfaces reactivated using FE-DBD
atmospheric plasma. Holzforschung 73, ahead of print. https://doi.org/10.1515/hf-2019-0005
INNORENEW COE INTERNATIONAL CONFERENCE 2020
36
samples
Gregor Lavrič1, Jure Žigon2, Sebastian Dahle3, Igor Karlovits4, Urška Kavčič5
1 Pulp and Paper Institute, gregor.lavric@icp-lj.si
2 Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, jure.zigon@bf.uni-lj.si
3 Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, sebastian.dahle@bf.uni-lj.si
4 Pulp and Paper Institute, igor.karlovits@icp-lj.si
5 Pulp and Paper Institute, urska.kavcic@icp-lj.si
UV LED printing technology can be used for printing directly on wood, which enables new
options for unique printed wooden elements in the interior and exterior design. With appropriate
design and processing technology, all kinds of wood samples and end products (doors, furniture
elements) can be enriched and their added value can be raised. Depending on the application’s
end use, a pre- or post-treatment may be required to improve ink adhesion and durability.
Plasma treatments are a common procedure to improve the performance of coatings and
adhesives on various substrate materials. Particularly on wood, air plasma treatments are known
to improve adhesion strength and durability of many types of lacquers and varnishes (Žigon et
al., 2018). In some cases, air plasmas were even found to be a suitable replacement for parts
of the conventional pretreatments, such as the last step of sanding before applying the coating
(Wolkenhauer et al., 2009). In other cases, chemical primers could be excluded altogether on
plasma pretreated substrates (Viöl et al., 2012).
In this research, Common beech (Fagus sylvatica L.) wood samples were printed using flatbed
UV LED inkjet system (Apex 1610) with Nazdar UV inks. Half of the specimens were pretreated
using a dielectric barrier discharge (DBD) plasma in atmospheric air (Žigon et al., 2019). To
determine the influence of the DBD pretreatment print gloss, print sharpness and abrasion
resistance of the printed samples were measured. Print gloss was measured on the 100 %
covered printed black area with Novo Gloss Trigloss Gloss Meter (RHOPOINT) at 20, 65 and 85 °
gloss angles. The results indicate no significant changes regarding specular reflections after the
DBD pretreatment. Print sharpness as a surface quality factor was determined with modulation
transfer function (MTF) using ImageJ, an open source image processing program. The results
of abrasion resistance obtained with Taber Abraser didn’t show significant difference, either.
Based on these results, it can be concluded that DBD pretreatment did not have a significant
impact on printing properties of Common beech wood samples printed with UV inkjet.
Keywords: UV LED, printing, plasma treatment, gloss, abrasion resistance
Acknowledgements: The authors gratefully acknowledge the European Commission for funding
the InnoRenew project (Grant Agreement #739574) under the H2020 Widespread-Teaming
programme and the Republic of Slovenia for European Regional Development Fund financing.
REFERENCES
Viöl, W., Avramidis, G., Militz, H., 2012. Plasma treatment of wood. In: Handbook of Wood Chemistry and Wood
Composites. Ed. Rowell, R.M. second edition. CRC Press, Boca Raton. pp. 627–658.
Wolkenhauer, A., Avramidis, G., Hauswald, E., Militz, H., Viöl, W., 2009. Sanding vs. plasma treatment of aged
wood: A comparison with respect to surface energy. Int. J. Adhes. Adhes. 29, 18–22. https://doi.org/10.1016/j.
ijadhadh.2007.11.001
Žigon, J., Petrič, M., Dahle, S., 2018. Dielectric barrier discharge (DBD) plasma pretreatment of lignocellulosic
materials in air at atmospheric pressure for their improved wettability: a literature review. Holzforschung 72, 979–
991. https://doi.org/10.1515/hf-2017-0207
Žigon, J., Petrič, M., Dahle, S., 2019. Artificially aged spruce and beech wood surfaces reactivated using FE-DBD
atmospheric plasma. Holzforschung 73, ahead of print. https://doi.org/10.1515/hf-2019-0005
INNORENEW COE INTERNATIONAL CONFERENCE 2020
36
