Projects for Moulding and Shape Fixation of Wood Veneer
Doctorate of Dr. Nadine Herold
Dr. Nadine Herold's dissertation was awarded the annual Thurn and Taxis Award for Forest Sciences. The award ceremony took place on 09.12.2015 in Regensburg:
Award ceremony in Regensburg: from left: Prof. Dr. Christoph Lütge (TUM), Forstdirektor Hans-Peter Fritzsche, Prof. Dr. Alexander Pfriem on behalf of the awardee Dr. Nadine Herold (HNEE), Vice President Prof. Dr. Hana Milanov (TUM), Dean of Studies Prof. Dr. Michael Weber (TUM) (Image source: S.Heine/Forest Wood Center Weihenstephan)
The Board of Trustees honors Dr. Herold for her outstanding doctoral thesis on the topic of “Simultaneous Moulding and Shape Fixation of Wood Veneer by Specific Material Modification”.
The doctoral thesis conducted by Dr. Herold in cooperation between the Technical University of Dresden and the Eberswalde University for Sustainable Development deals with wood chemical and wood technological issues in veneer processing. With the approach researched by Ms. Herold, veneers can be better formed. This allows, for example, tighter bending contours and lower defect rates for veneered components in furniture, interior design and vehicle interiors. The substance used for plasticizing - furfuryl alcohol obtained from natural substances - can be cured into a polymer after forming, thus permanently fixing the mold. In the future, this will result in a wide range of applications in the field of vehicle and home interiors, but also in engineered wood construction. At the same time, currently used binders based on fossil raw materials can be substituted by natural raw materials.
The work makes an important contribution to the improved use of veneers, which represent an important added value of forestry products. By substituting petroleum-based binders and using sustainably produced raw materials, a contribution can be made to the decarbonization of the economy.
DFG project on simultaneous Moulding and Shape Fixation of Wood Veneer by Specific Material Modification
Due to its chemical structure and structural anisotropy, the renewable raw material wood exhibits material-specific characteristics at the various levels (macro, micro, nano). Therefore, materials science investigations of lignocellulosic materials have to be carried out in the sense of a multi-scale approach on the different levels in order to obtain comprehensive knowledge about the structure-property behavior.
The aim of this project is to gain a deeper understanding of the altered material behavior of modified woods and to clarify effective relationships between the chemical composition of the modified wood substance and the mechanical properties. The formability of veneers for the coating of surfaces or for the production of moldings is improved by a specific material modification. The background to this modification is the impregnation of veneers with furfuryl alcohol solutions, which forms furan polymers in the cell walls by temperature-induced acid catalytic reactions. For this purpose, the furfuryl alcohol solutions contain, in addition to furfuryl alcohol, at least one other substance which - reinforced by an increase in temperature - initiates the polymerization. The plasticization of the veneers to improve formability and the mold fixation are thus realized with the same chemical substance. The process steps of forming, mold fixing and curing take place in one operation. From chemical, physical and structural investigations, interrelationships are derived and their general validity and transferability to other wood species are estimated.
In the future, the understanding of the interrelationships of the modification process and the development of a process for the simultaneous forming and form-fixing of thin wood layers will lead to an increase in the range of applications for natural and sustainably produced raw materials.
Partners of the research project
Technical University of Dresden:
Institute for Wood and Paper Technology
Institute of Plant and Wood Chemistry
Scion, Rotorua, New Zealand
BMBF FHprofUnt Project "Holz UFO"
This project is funded by the Federal Ministry of Education and Research within the framework of the FHprofUnt funding guideline.
Funding code: 03FH001 PX4
Project duration: 01.10.2014 - 31.12.2018
Utilization of wood veneers for simultaneous moulding, shape fixation and composite material production through specific impregnation and material modification
Other Funding frameworks
This project was funded by Deutsche Forschungsgemeinschaft (DFG) as a grant in kind.
Funding code: PF 686/4-1
Project duration: 01.10.2010 - 30.09.2013
Funding code of the follow-up project: PF 686/4-2
Project duration: 01.10.2013 - 31.12.2013
A research visit (Short Term Scientific Mission - STSM) at Scion, Rotorua, New Zealand was funded through COST Action FP0802 Experimental and Computational Micro-Characterisation Techniques in Wood Mechanics.
COST STSM Reference Number: COST-STSM-FP0802-7691
Duration: 18.06.2011 - 10.08.2011
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Poster on the content of the research project
Head of project and contact persons
Prof. Dr.-Ing. Alexander Pfriem (Alexander.Pfriem@hnee.de)
Dr. rer. silv. Nadine Herold (Nadine.Herold@hnee.de)
Leo Felix Munier, M.Sc. (LeoFelix.Munier@hnee.de)
Publications
Franke, T.; Herold, N.; Buchelt, B.; Pfriem, A.: The Potential of Phenol-Formaldehyde as Plasticizing Agent for Moulding Applications of Wood Veneer - Two-Dimensional and Three-Dimensional Moulding. European Journal of Wood and Wood Products. DOI: 10.1007/s00107-018-1320-1
Franke, T.; Mund, A.; Lenz, C.; Herold, N.; Pfriem, A.: Microscopic and Macroscopic swelling and dimensional stability of beech wood impregnated with phenol-formaldehyde, ProLigno, 13 (2017) 4, 373-378; Article download (Open Access)
Franke, T.; Lenz, C.; Hertrich, S.; Kuhnert, N.; Kehr, M.; Herold, N.; Pfriem, A.: Künstliche Bewitterung von Buchenfurnier imprägniert mit drei Phenolharzen unterschiedlichen Molekulargewichts. Holztechnologie, 58 (2017) 1, 24-30
Herold, N.; Grigsby, W.; Franich, R.; Pfriem, A.: Changes in Stiffness of Wood Veneer during Furfuryl Alcohol Modification. European Journal of Wood and Wood Products, 73 (2015) 5, 693-695
Zerbst, D.; Horbelt, N.; Brodhagen, T.; Stegmann, F.; Brösel, L.; Pockrandt, M.; Herold, N.; Pfriem, A.: Influence of Wood Species on the Melting Behaviour of Waxes Investigated by Differential Scanning Calorimetry. 8th European Conference on Wood Modification, Helsinki, Finnland, 26.-27.10.2015
Kampe, A.; Herold, N.; Pfriem, A.: Impact of wood species on furfuryl alcohol modification studied by DSC. 8th European Conference on Wood Modification, Helsinki, Finnland, 26.-27.10.2015
Pfriem, A.; Herold, N.: Simultaneous Moulding and Fixation of Veneer by Furfuryl Alcohol Modification. Thermosets 2015: from Monomers to Components, Berlin; Deutschland, 16.-18.09.2015
Franke, T.; Terziev, N.; Panov, D.: Impact of various formulations of epoxidised linseed oil and methyltrithoxysilane due to weathering performance of Scots Pine, 11th annual meeting of the Nordic Baltic Network in Wood Material Science & Engineering (WSE), Poznan, Poland. 14-15.09.2015
Herold, N.; Lenz, C.; Pfriem, A.:Changes in Cell Wall Dimensions during the Different Stages of Furfuryl Alcohol Modification. BioResources, 9 (2014) 3, S. 4756-4763; Article download (Open Access)
Herold, N.; Lenz, C.; Pfriem, A.: Changes in Cell Wall Dimensions during the Different Stages of Furfuryl Alcohol Modification. 7th European Conference on Wood Modification, Lissabon, Portugal, 10.-12.03.2014
Herold, N.; Pfriem, A.: Simultaneous moulding and fixation of veneer by specific material modification. 7th European Conference on Wood Modification, Lissabon, Portugal, 10.-12.03.2014
Herold, N.; Pfriem, A.: Shape Retention of Furfurylated and Moulded Wood Veneer. BioResources, 9 (2014) 1, S. 545-553; Article download (Open Access)
Herold, N.; Pfriem, A.: Set-recovery of furfurylated and shaped veneer. 9th meeting of the Nordic Baltic Network in Wood Material Science & Engineering (WSE), Hannover, Germany, 11.-12.09.2013
Herold, N., Pfriem, A.: Impregnation of Veneer with Furfuryl Alcohol for an Improved Plasticization and Moulding. European Journal of Wood and Wood Products, 71 (2013) 2, S. 281-282, DOI:10.1007/s00107-013-0677-4
Herold, N.; Dietrich, T.; Grigsby, W. J.; Franich, R. A.; Winkler, A.; Buchelt, B.; Pfriem, A.: Effect of maleic anhydride content and ethanol dilution on the polymerization of furfuryl alcohol in wood veneer studied by differential scanning calorimetry. BioResources. 8 (2013) 1, S. 1064-1075; Article download (Open Access)
Herold, N.; Dietrich, T.; Grigsby, W.; Franich, R.; Winkler, A.; Buchelt, B.; Pfriem, A.: Effects of Maleic Anhydride on the Curing of Furfuryl Alcohol in Wood Veneer Studied by Differential Scanning Calorimetry. Workshop “Micro Characterisation of Wood Material & Properties”, Edinburgh, Scotland, 24.-26. Oktober 2012
Herold, N.; Dietrich, T.; Grigsby, W.; Buchelt, B.; Franich, R.; Pfriem, A.: Effects of Different Process Parameters on the Polymerisation of Furfuryl Alcohol in Wood Studied by DSC. 6th European Conference on Wood Modification, Ljubljana, Slowenien, 16-18.09.2012
Herold, N.; Pfriem, A.: Impregnation of Veneer with Furfuryl Alcohol for an Improved Plasticization and Moulding. 6th European Conference on Wood Modification, Ljubljana, Slowenien, 16-18.09.2012
Dietrich, T.; Pfriem, A.; Buchelt, B.; Wagenführ, A.: Densification of beech wood: Furfuryl alcohol impregnation for improved plasticization, fixation and properties. „Hardwood Science and Technology” The 5th Conference on Hardwood Research and Utilisation in Europe, 10.-11.09.2012, Sopron, Hungary
Buchelt, B.; Pfriem, A.; Wagenführ, A.: Investigations of the compressive behavior of veneer in thickness direction. Drvna industrija — “Wood Industry”, 63 (2012) 1, S. 33-36, DOI:10.5552/drind.2012.1122
Pfriem, A.; Buchelt, B.; Dietrich, T.: Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood. COST Action FP0904 Workshop “Current and Future Trends of Thermo-Hydro-Mechanical Modification of Wood Opportunities for new markets? Nancy, France, 26.-28.03.2012, Posterdownload
Pfriem, A., Dietrich, T., Buchelt, B.: Furfuryl alcohol impregnation for improved plasticization and fixation during the densification of wood. Holzforschung, 66 (2012) 2, 215-218, DOI:10.1515/HF.2011.134
Pfriem, A.: Simultaneous shaping and fixation of veneer by specific material modification. COST Early Stage Researchers Forum, Warschau, Polen, 26.09.2011
Herold, N.; Pfriem, A.: Simultaneous shaping and fixation of veneer by specific material modification. COST Action FP0904 Workshop “Thermo-Hydro-Mechanical Wood Behaviour and Processing” Biel, Schweiz, 16.-18.02.2011, S. 153-154
Pfriem, A.; Buchelt, B.; Dietrich, T.; Zauer, M.: Revaluation of European hardwood species by a combined modification, compressing and shaping processes. 5th European Conference on Wood Modification, Riga, Lettland, 20.-21.09.2010
