Your search resulted in 269 documents. Displaying 25 entries per page.
VOC-free remedial treatment agent on organic solvent basis with surface cleaning by photocatalysis using titanium dioxide
2014 - IRG/WP 14-40651
Due to the EU Regulations according to the harmonisation of the European market of biocidal products and the EU Regulations regarding emissions of volatile organic compounds in residential properties a new VOC free yet organic solvent based remedial treatment agent is introduced including a potential method to clean up the wooden surface of remaining biocides after a remedial treatment using photo...
H Ahl, J Fromm, P Jüngel, E Melcher, M Pallaske
Full-scale impregnation of wood with siloxane using supercritical carbon dioxide
2014 - IRG/WP 14-40659
Full-scale impregnation of wood with siloxane was carried out using supercritical carbon dioxide as solvent. A batch of 3530 kg of Scots pine sapwood was impregnated to a retention of approximately 1.3% siloxane. The treatment also consisted of a simultaneous impregnation with organic biocides. The performance of the wood was evaluated in terms of capillary water uptake according to a modified EN ...
A Kjellow, F Imsgard, J Fernandes, R Wagner, J Delis
The effect of UV irradiation on some technological properties of different polyurethane varnishes coated plywood panels from veneers dried at different temperatures
2014 - IRG/WP 14-40661
In this study, the effect of UV irradiation on some technological properties of three different polyurethane varnishes coated plywood panels produced from Scots pine (Pinus sylvestris L.) and Maritime pine (Pinus pinaster L.) veneers manuactured and dried at different temperatures was studied. Accordingly, 32°C log peeling temperature and three different veneer drying temperatures (110, 140 and ...
Ö Özgenç, C Demirkir, Ü C Yildiz, G Çolakoğlu
Improving dimensional stability of thermally treated wood by secondary modification – potential and limitations
2014 - IRG/WP 14-40664
The potential of treating thermally modified wood with melamine resin to improve the dimensional stabilization is tested in this research. Two different boards of poplar (Populus ssp.) were cut into two halves. One half of each board was thermally modified (T1 and T2) in a commercial process, the other half was used as untreated reference material. The material was thermally modified using the vac...
G Behr, K-C Mahnert, S Bollmus, H Militz
Development of new wood treatments combining boron impregnation and thermo modification - Effect on decay and termites durability
2014 - IRG/WP 14-40666
Environmental pressures appeared in most European countries during the last decade has lead to the development of more environmentally acceptable preservation methods. In this context, wood heat treatment has been one of the most investigated alternative methods during the last years. Treated at temperatures ranging between 180 and 220°C, wood components undergo more or less important chemical mo...
S Salman, A Pétrissans, M-F Thévenon, S Dumarçay, B Pollier, P Gérardin
The role of hydrophobins in surface growth by the Blue Stain fungi Aureobasidium pullulans
2015 - IRG/WP 15-10837
Hydrophobins are small proteins found exclusively in filamentous fungi. These proteins are able to assemble spontaneously into amphiphilic monolayers at hydrophobic–hydrophilic interfaces. Hydrophobins have a diverse role, e.g. allowing the fungi to break through interfaces during aerial hyphae formation, sporulation, fruit body production and cell penetration. In this ongoing study, we are look...
J Stenbæk, L Riber, J Blæsbjerg Nielsen, C Møller Hansen, B Jensen
Effects of UV Radiation on Melanization and Growth of Fungi Isolated from Weathered Wood Surfaces
2015 - IRG/WP 15-10842
This research tests the hypothesis that fungi isolated from weathered wood will respond to elevated levels of UV radiation by increasing their melanin production. To test this hypothesis, we measured the melanin production and mycelial color of Aureobasidium pullulans and Cladosporium cladosporioides, before and after the fungi were grown under artificial UV, visible light and complete darkness. T...
V A Hernández, P D Evans
Acceptance levels of surface disfigurement - tolerance to defects of coated wood
2015 - IRG/WP 15-20564
Service life planning (PSL) has become an important issue in performance based building and substantial progress has been made in recent years. The role of predicting the aesthetical service life of wooden building components has been underestimated for quite long time but is recently attracting more and more notice. It is influenced by numerous factors such as discoloration, fading, flaking, crac...
C Brischke, P Kaudewitz
Functional silicones used as a potential tool for the development of non-biocidal wood treatments
2015 - IRG/WP 15-30665
The increase of wood resistance against biological agents for outdoor use is conventionally performed by deep impregnation with preservatives. However, some of the traditional wood preservatives, used for decades for wood protection and regarded as the most effective, are currently subjected to severe restrictions because of their toxicity. In fact, new preservation technologies are constantly ent...
F Lhumeau, C Delaite, F Marchal, F Pochon, M Kutnik
Characterization of biofilm formation on wood treated with vegetable oils by color-based image interpretation method
2015 - IRG/WP 15-40697
The protection of wood in order to extend its service life is an important issue nowadays. As an alternative to traditional wood coatings biofilms can be used. It is a living protective coating for the wood surface against UV and bio-degradation that has the ability to recover from local damage, such as cracks. This paper presents preliminary results of biofilm formation from an 8-month’s fie...
K Filippovych, H Huinink, L van der Ven, O C G Adan
Termiticide Residues in Building Foundation Aggregate Fills After Trench and Surface Applications
2015 - IRG/WP 15-30679
Termiticide concentrations (ppm) in aggregate fill were determined by measuring active ingredient (a.i.) residues of two pyrethroid termiticides, Up-Cyde Pro® 2EC-cypermethrin, and BaseLine® EC-bifenthrin, at 24.0 hours, and then at 6.0- and 12.0-months after ‘horizontal’ surface applications, perimeter ‘trenching and rodding’ applications, or ‘rodding only’ trench applications at lo...
B M Kard, C E Koneman, K T Shelton, C C Luper, R A Grantham
Simulation of surface climate and mould growth on wooden façades
2016 - IRG/WP 16-20585
The weathering of wooden surfaces is normally caused by mould growth, lignin deterioration and leaching of extractives. For well insulated buildings, the effect of the interior climate on the outer surface is small and sometimes negligible. This paper describes simple models for surface temperature and moisture conditions on a wooden façade that can further be used to model weather degradation an...
T K Thiis, I Burud, D Kraniotis, L Ross Gobakken
Accelerated Weathering Performance of Impregnated Wood Samples Coated with Zinc by Means of Plasma-Assisted Particle Deposition
2016 - IRG/WP 16-30682
Many different methods are currently applied for wood protection against outdoor conditions. The most important of these is the process of impregnation with liquid substances. However, this kind of wood preservatives cannot provide a long-term protection of wooden surfaces. Weathering-resistant surfaces can be obtained by applying UV absorbing agents. In this study, the influence of zinc particles...
A Can, H Sivrikaya
The termite resistance of wood impregnated with nano-zinc oxide and nano-zinc borate dispersions
2016 - IRG/WP 16-30691
In this work, the effects of the impregnation with nano-ZnO and nano-ZnB dispersions on the termite resistance of European beech wood were investigated. Three different concentrations (namely 0.5%, 1% and 2%) of the above two materials were tested. Water leaching effect was also investigated. It was concluded that a severe effect in terms of termite workers mortality is induced by the use of both ...
C Lykidis, T de Troya, M Conde, J Galván, G Mantanis
Modifying wood with paraffin wax emulsion impregnation and thermal modification: hydrophobization effect and mechanism of the combined treatment
2016 - IRG/WP 16-40726
The aim of this study was to enhance the water repellency of wood by a combined treatment of paraffin wax emulsion (PWE) impregnation and thermal modification. Two different treating procedures were used to modify the southern pine (pinus spp.). One is first PWE impregnation and then thermal modification, another is first thermal modification and then PWE impregnation. The treated samples were imm...
Wang Wang, Jinzhen Cao, Cong Chen
Impregnation of railway sleepers - Pressure gradient and transversal penetration
2016 - IRG/WP 16-40731
Based on the possible ban of creosote in the future, the need for oil based alternative products has gained in importance. Due to possible differences in impregnation properties compared to creosote the need for re-implementing former technology is given, to determine if momentarily used impregnation processes have to be modified. The here reported tests measure the pressure gradient during the im...
M Starck, A Gellerich, H Militz
Dynamic mechanical analysis of viscoelastic properties of heat treated glycerol-impregnation poplar wood
2016 - IRG/WP 16-40732
The viscoelastic properties of glycerol-impregnated poplar wood after heat treatments at various temperatures were examined by dynamic-mechanical analysis. The spectra of storage modulus (E’) and loss tangent (tgδ) in the frequency at 10 Hz were measured at the temperature range from -100 to 300℃. Compared to no peak in E’ spectra and two relaxation processes in tanδ spectra of...
Li Yan
Formation of hydrophobic wood surface by means of thermal treatment and surface modification with alkyl ketene dimer (AKD)
2016 - IRG/WP 16-40738
One of the major shortcomings of wood-based materials compared to technical materials is attributed to their poor dimensional stability in changing climates and in contact with liquid water. Heat treatment induces chemical change with a consequent decreasing of reactivity of the material showing unwanted surface inactivation. Alkyl ketene dimer (AKD) is a widely used sizing agent in papermaking, w...
T Lovaglio, T Meints, L Todaro, W Gindl-Altmutter
The influence of log soaking temperature and thermal modification on the properties of birch veneers
2016 - IRG/WP 16-40749
In veneer manufacture the logs are routinely soaked in heated water baths in order to soften the wood prior to peeling. The temperature of the water may vary greatly between batches; however, the influence of log soaking temperature on veneer properties has had little research attention. Uncontrolled moisture is known to cause problems in wood-based materials, while thermal modification offers a m...
S Källbom, K Laine, M S Moghaddam, A Rohumaa, K Segerholm, M Wålinder
Influence of pressure phase impregnation time on the uptake and distribution of wood preservatives in Scots pine material of diverse treatability
2016 - IRG/WP 16-40752
In spite of the general opinion that Scots pine sapwood is easy to impregnate considerable variations in treatability are reported. In order to study impregnation results of diverse Scots pine sapwood treated with increasing process times, Scots pine sapwood from two different predefined treatability groups was impregnated. A copper solution was used as impregnation agent in ten different vacuum p...
K Zimmer, B Kerfriden
Improvement of wood properties by impregnation with liquefied spruce bark based resins
2016 - IRG/WP 16-40761
In this paper, biobased phenolic thermosetting resins are designed to be used as wood stabilization treatment. The originality of the study stands in substituting part of phenol by spruce (picea abies) bark: this is achieved by a liquefaction process in phenol in the presence of sulfuric acid as catalyst. Next, thermosetting resins are synthetized from liquefied bark by condensation on formaldehy...
X Duret, E Fredon, E Masson, P Gérardin
Development of Wood Modification – High melting point wax and hot oil treatments
2016 - IRG/WP 16-40768
This study covers an introduction to the projects where new facilities were created for developing wood modification. In this new research environment it is possible to treat wood with versatile equipment. First modifications with this equipment are going to be done in high temperature and pressure using high melting point waxes and hot oils.
Earlier studies, tests and commercial products show...
H Turunen, L Linkosalmi, J Peura, O Paajanen
Quality of the impregnated wood in the Slovenian hardware stores
2017 - IRG/WP 17-20606
Ten different samples from Slovenian hardware stores were analysed. Samples were treated with copper based wood preservatives and designed and advertised to be used in heavy duty applications in use classes 3.2 or 4. In order to determine the quality of the treatment penetration, retention and fungicidal properties were determined. Retention was determined with XRF analysis, while modified EN 113 ...
M Humar, B Lesar, N Thaler, D Kržišnik, N Kregar, S Drnovšek
Evaluation of surface cracks on wood – physical assessment versus subjective sensation
2017 - IRG/WP 17-20617
In the presented studies from the University of Goettingen (Study I) and the University of Hannover (Study II), the assessment of cracks with different methods and their acceptance in general as well as depending on different target groups are investigated. The aim was to determine which factors are relevant for a crack evaluation and which visual impression of a wooden surface is tolerable for co...
A Gellerich, C Brischke, L Emmerich, L Meyer-Veltrup, P Kaudewitz
Effects of Nano-Wollastonite Impregnation on Fire Properties of Some Thermally-Treated Solid Wood Species
2017 - IRG/WP 17-40771
The effects of nano-wollastonite (NW) suspension impregnation on the fire-retarding properties of heat-treated solid wood of three species (beech, poplar, fir) were studied. Heat treatment was performed at two temperatures of 180 °C and 200 °C. Impregnation was carried out at a pressure of 3 bars for 30 min. The fire properties included ignition time, glowing time, back-darkening, back-splitting...
H R Taghiyari, R Hossinpourpia, S Adamopoulos, A Jahangiri, D Rabie