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VOLUME 0, ISSUE 4/2015

Vibration welded joints of Wood-Plastic Composites (WPC) made of same and mixed materials

Language: German
Pages: 5 - 10
Authors: Christine Schubert, Sven Friedrich, Michael Gehde

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The article summarizes investigation results on vibration welded joints of injection moulded, polypropylene-based WPC sheets. Thereby, information about technical limits of WPC-vibration welds and suggestions for process management are provided. The usage of injection moulded parts for automotive interior is focused. WPC welds of same and mixed materials have been manufactured trouble-free. Welding factors of 0.6 could be reached and are at the same level of those typical for glass fibre reinforced polypropylene. A wide joining pressure window from 0.5 MPa to 2.0 MPa allows an easy process management for vibration welding in industrial environments.

Review: The emissions emitted by thermally modified beech wood with and without surface finished

Language: English
Pages: 11 - 17
Authors: Daniela Tesařová, Petr Čech

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This paper describes the VOC emissions emitted by massive beech wood treated at 180 °C and 200 °C. The focus was on the influence of temperature on the quality and quantity of volatile organic compounds, especially on the amount of emitted phenol and furfural. The emission was analysed as function of time after heat-treatment. The influence of the finishing waterborne lacquer on VOC emissions was also investigated.

Test method to assess the durability of flexible materials as a hinge for furniture

Language: German
Pages: 18 - 25
Authors: Tony Gauser, Stefan Schmidt, Jean-Pierre Mouton

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Thin, flexible materials can be used as a hinge in furniture and interior fittings. A method is described, which allows the precise specification of suitable hinge constructions made of different materials, such as films, fabrics, knitted fabrics, nonwovens, in foldable furniture elements In addition, the loading of hinge constructions is a superposition of bending and tensile stresses. In order to characterise durability and failure mechanisms of hinges made of thin flexible materials a new test method called Pendulum type test was developed at the Institut für Holztechnologie Dresden (IHD).

Assessment of the global warming potential of a wood product for outdoor use

Language: English
Pages: 26 - 32
Authors: Franco Bulian, Elio Padoano, Dario Pozzetto, Michele Sburlino, Riccardo Zanello

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The natural composition of wood is not compatible with the use of such material in outdoor environments as it is exposed to severe degradation agents. In order to protect it from the negative effects of such agents, wood can be a subject to specific treatments. Wood treatments are considered as “passive” when they modify only the properties of the material without altering its chemical composition (impregnation). Conversely, “active” treatments modify the chemical nature of wood. These treatments (thermal and chemical) produce a different material known as “modified wood”. The overall environmental performance of wood treatments has not received much attention in the scientific or technical literature. This is in contrast with the recent methodologies of process analysis and assessment, which underline that this aspect can be critical for the selection of the most appropriate technology. The paper reports the results of a preliminary environmental assessment of a pole made of pine wood for outdoor use which was subject to three treatments: impregnation, thermal treatment and acetylation. The study assesses the environmental impact of the treatment process but not of the final product. In addition, the environmental impact here discussed is limited to one impact category (Global Warming Potential – GWP) of the life-cycle assessment methodology.

Review: Decontamination methods on art and cultural heritage WTA-leaflets have been available since 2014

Language: German
Pages: 33 - 40
Authors: Manfried Eisbein

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The Institute of Cultural Heritage Preservation in Saxony (LfDS) addressed the issue of the process of decontamination, very early on, and initiated a first DBU project in 1998. Some of those early findings lead to widely accepted and successful approaches of decontamination such as the vacuum approach or the masking approach. Other technologies were not able to take hold due to lack of financing or not being able to prove being successful. Different approaches were used simultaneously on cultural heritage, in order to receive a long term comparison in efficiency and sustainability of those decontamination technologies. A range of decontamination approaches with its strengths and weaknesses are being presented. In many cases one cannot expect a complete decontamination which requires therefore monitoring and possibly further measures. With the construction of two WTA leaflets about decontamination of cultural and historical heritage a better understanding of thus was sought for building experts as well as the owners (WTA, 2013). The leaflets provide an overview of the noxious substances and provide possibilities and methods of detecting contamination through wood preservatives. They conduce to the evaluation of risk of possible contamination and assist with planning appropriate measures. In particular, they explain possibilities as well as limits of the different approaches.

Review: Species community and wood decay capability of fungi on wood in use

Language: German
Pages: 41 - 50
Authors: Kordula Jacobs, Katharina Plaschkies, Natalie Rangno, Björn Weiß, Wolfram Scheiding

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In recent years, the Institut für Holztechnologie Dresden (IHD) has carried out numerous studies to investigate fungi in damaged wood. In a retrospective analysis, the frequency of individual fungal groups and species was investigated. Furthermore, the decay capability of frequently occurring fungi was evaluated using laboratory tests. The corresponding results are summarized and discussed in this work.

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