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- Burström, Mats, 1962-, et al.
(författare)
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Nutida landskap, modern industri och förorter står nu på tur
- 2000
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Ingår i: Kulturmiljövård. - Stockholm : Riksantikvarieämbetet. - 1100-4800. ; :1, s. 64-67
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Vid en eventuell översyn av riksintresseområden ter det sig naturligt att lyfta fram landskapets kulturvärden i ett mångvetenskapligt perspektiv, liksom att kartlägga 1900-talets industri- och kommunikationsmiljöer. Andra miljöer att lyfta fram är efterkrigstidens förorter.
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| 4. |
- Sandin, Gustav A, 1983, et al.
(författare)
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Sustainability Assessment in Product Development: Experiences from Two Projects
- 2011
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Ingår i: Poster presentation at the AGS annual meeting 'Sustainability and change', 23-25 January 2011, Gothenburg, Sweden.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The poster describes how sustainability is assessed in product development, drawing from experiences of two on-going projects: WoodLife and CelluNova. The objective of WoodLife is to improve properties and increase service-life of clear coatings and adhesives for wood, and hence widen wood product’s scope of application. If this allows wood to replace energy-intensive materials or materials of fossil origin (e.g. aluminium or PVC in window frames, respectively), there is a potential to, for example, decrease greenhouse gas emissions.In CelluNova, the aim is to develop dissolving and spinning conditions which facilitate integration of textile fiber production into pulp mills. This has the potential to be environmentally beneficial compared to today’s pulp-based textile fibers (e.g. viscose). It can also enhance the competitiveness of pulp-based textile fibers compared with today’s market-dominating alternatives: cotton and polyester fibers – fibers subject to environmental concerns and possibly future supply issues due to an anticipated rise in global textile demand.Both projects can potentially expand the forest’s role in solving the resource problems of tomorrow and contribute to a more sustainable society. But unless sustainability parameters are monitored during product development, new unwanted sustainability issues may be introduced along the way. The assessment is founded on the methodology of life cycle assessment, social life cycle assessment and life cycle costing, reflecting the environmental, social and economic dimensions of sustainability, respectively. Five main challenges have been identified: communication, definition of sustainability, underdeveloped methodology, non-existence of production processes and comparison of inherently different dimensions. In the poster, these challenges are elucidated along with experiences of various approaches to tackle them. For example, an exercise on rating different indicators of social sustainability has been carried out within CelluNova. This turned out to be valuable in addressing three of the identified challenges: communication, definition of sustainability and underdeveloped methodology.
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| 5. |
- Westin, Mats, 1962
(författare)
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High-Performance Composites from Modified Wood Fiber
- 1998
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The objective of this work was to produce and evaluate high-performance wood fiber composites. High-performance was defined as: high dimensional stability and a high durability, including resistance to wood-decaying organisms (fungi, bacteria, and insects). The main method, used to accomplish these properties, was acetylation of the wood fibers prior to the composite production. Acetylation involves a chemical modification of wood components, which was carried out by reaction with acetic anhydride. Another method applied was impregnation with kraft lignin followed by fixation of the lignin with an aluminum salt solution. Thus, lignin metal complexes are formed in situ - complexes that are insoluble under normal conditions in the environment. Test results show that both methods lead to more dimensionally stable composites, i.e. reduced swelling and shrinkage due to a varying moisture load. Kraft lignin treatment of wood fiber was estimated to be an economical method for obtaining a certain degree of stabilization of composites (fiberboards), although the composites cannot be labeled "high-performance" since they do not meet all requirements, as defined above. However, the use of acetylated fibers leads to a very high degree of dimensional stability as well as biological decay resistance and, furthermore, the mechanical properties are maintained during and after cyclic climate aging. Regardless of the lignocellulosic fiber source used, the thickness swelling of acetylated fiberboards in water is reduced by approximately 90% and results from cyclic testing according to EN 321 (three cycles, each comprising 72h water immersion, 24h freezing at -18°C and 72h drying at 70°C) show that more than 85% of the original internal bond strength, IBS, remains after testing. The latter figure should be compared with the corresponding value of 20-40% obtained for fiberboards made from unmodified fibers. Acetylated wood fiber composites have also been tested for resistance to biological decay in a worldwide field test where 30 cm long fiberboard stakes were half-buried in soil. After three years of testing, most of the control stakes (made from unmodified fiber) had failed due to heavy decay while most of the acetylated composite stakes were perfectly sound, showing no sign of decay. To determine whether the acetylation, and other methods of chemical modification, cause any degradation of the cellulose, .alfa.-cellulose was isolated from unmodified and chemically modified fibers after which the intrinsic viscosity and molecular mass distribution (determined by size exclusion chromatography) of the cellulose samples were analyzed. The main part of the cellulose from acetylated wood fiber seems to be unaffected by the modification method, whereas the other modification methods appear to yield more or less degraded cellulose. In order to manufacture products with complex shapes, moldable flexible fibermats were produced on both a small pilot scale (kilograms) and on a large scale (over one metric ton). A variety of industrial products were manufactured from the acetylated fibermats: exterior doors, automotive panels, façade claddings, flooring boards, wet-room wall panels, toilet lids and roof tiles. Generally, it was found that the dimensional stability of the products was high and that other important properties, such as mechanical and weathering properties, were also very satisfactory. The conclusion is that composites based on acetylated wood fiber are truly high-performance, as defined above.
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