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Requirements for wood-based lightweight panels intended for furniture and interior use
Linnaeus University, Faculty of Technology, Department of Forestry and Wood Technology.
2018 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Introduction: Throughout many parts of the world, forests exist in one form or another. And for the timber from these forests to be used, it must be processed by, for example, sawing into planks and dried. Studies have shown that profits for the forest owners increase from beneficial processing of these raw materials. An efficient use of this raw material is to process it into lightweight panels. Some general incentives for using lightweight constructions are: economical, technical and environmental. Some general weaknesses with sandwich constructions are more sensitive to impact and bumps, risk for delamination, harder to make fastenings, and more sensitive to the concentration of point loads. This work aims to increase the knowledge of properties and design of wood based lightweight panels used for interiors and furniture. The intention with this knowledge is that it can contribute to the development of lightweight panels.

Material and method: A lightweight panel of cross glued sandwich type and a cross-glued multi-layered panel with densified face sheets have been used as an example to investigate and understand which parameters are crucial for a lightweight panel, made of wood. The lightweight panel of sandwich construction has been studied to consider the changes of shape brought about by moisture, as well as which mechanical properties this panel has, with a focus on creep deformation. Two methods for reducing the moisture-generated shape changes so as to increase the shape stability of the panel have also been studied. The methods are crossgluing and thermal treatment of the wood material. In the investigations of the panels, primarily quantitative methods in the form of empirical tests have been used. Some numerical simulations describing the moisture-generated shape changes and stresses that arise in the investigated lightweight panels were also made.

Results and discussion: Cross-gluing of a multi-layered panel and also for the lightweight panel used in this study is a way to reduce the movement in the panel, generated by moisture. The drawbacks with this method are that stresses occur in the panels when the moisture change, and this can lead to a decrease in the shape stability of the panel. Thermal treatment can also be used to decrease the moisture-generated movement in wood, and in this way increase the shape stability of the product. In those cases where the empirical experiments were combined with numerical simulations, there was good agreement between the experimental and the numerical results. With the lightweight panels a weight reduction was achieved from 307 to 540 kg/m3 compared with a solid beech wood panel. The creep deformation of the lightweight panel was better or comparable for 6 of the 8 studied groups, compared to solid beech wood panel. The study also show that is possible to adapt the mechanical properties through its design of this lightweight panel.

Place, publisher, year, edition, pages
Växjö: Linnaeus University Press, 2018. , p. 82
Series
Lnu Licentiate ; 12
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
URN: urn:nbn:se:lnu:diva-72069ISBN: 978-91-88761-41-5 (print)ISBN: 978-91-88761-42-2 (electronic)OAI: oai:DiVA.org:lnu-72069DiVA, id: diva2:1194637
Supervisors
Available from: 2018-04-03 Created: 2018-04-03 Last updated: 2018-04-03Bibliographically approved
List of papers
1. Shape stability of modified engineering wood product (EWP) subjected to moisture variation
Open this publication in new window or tab >>Shape stability of modified engineering wood product (EWP) subjected to moisture variation
2011 (English)In: Wood Material Science & Engineering, ISSN 1748-0272, E-ISSN 1748-0280, Vol. 6, no 3, p. 132-139Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Oxford: Taylor & Francis, 2011
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-10111 (URN)10.1080/17480272.2011.552122 (DOI)2-s2.0-80052251767 (Scopus ID)
Available from: 2011-01-17 Created: 2011-01-17 Last updated: 2018-04-03Bibliographically approved
2. Moisture-related distortion and damage of lightweight wood panels: experimental and numerical study
Open this publication in new window or tab >>Moisture-related distortion and damage of lightweight wood panels: experimental and numerical study
2017 (English)In: Journal of the Indian Academy of Wood Science, ISSN 0972-172X, Vol. 14, no 2, p. 00-109Article in journal (Refereed) Published
Abstract [en]

This study was conducted to increase the knowledge of moisture-related distortion and damage in the field of wood-based lightweight panels. By increasing the possibilities of predicting moisture-related distortion and damage, the possibilities of using lightweight wood materials could increase. The study was performed through experiments and modelling work on a wooden panel product with numerous struts and two thin outer-face sheets of beech-wood glued tightly onto the struts, as well as reference panels of solid wood. During the testing period the results showed the density of the studied lightweight panels to vary from 170 to 290 kg/m3. These panels shrunk and swelled less than the solid wood panels and reacted faster to changes of surrounding humidity and temperature. Moisture related distortions such as twist and bow were not inferior compared to the solid wood panels. Shrinkage or swelling produced moisture related stresses. This may mean that the panel will have a risk of serious damage in the form of cracks or glue release between the outer face sheet and the struts when it is exposed to intense drying. The experimental tests also followed how various damages arose in the panels. Until the damage occurred, the deformation results showed a strong agreement between the experimental and the model findings. Better knowledge of how this type of panel reacts to climate variations is important for the further design and development of this type of product.

Keywords
Sandwich panel, Stresses, Shape stability, Numerical modelling, Finite element method (FEM)
National Category
Wood Science
Research subject
Technology (byts ev till Engineering), Forestry and Wood Technology
Identifiers
urn:nbn:se:lnu:diva-68220 (URN)10.1007/s13196-017-0193-y (DOI)
Available from: 2017-10-05 Created: 2017-10-05 Last updated: 2018-04-03Bibliographically approved
3. Densified and thermally modified wood in light-weight panels
Open this publication in new window or tab >>Densified and thermally modified wood in light-weight panels
2014 (English)In: Presented at the 2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014, 2014Conference paper, Oral presentation with published abstract (Refereed)
National Category
Wood Science
Identifiers
urn:nbn:se:lnu:diva-34584 (URN)
Conference
2014 Forest Products Society International Convention Program, Quebec City, Canada, August 10-13, 2014
Note

Ej belagd 20141022

Available from: 2014-06-03 Created: 2014-06-03 Last updated: 2018-04-03Bibliographically approved

Open Access in DiVA

Licentiate Thesis (Comprehensive Summary)(772 kB)9 downloads
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Nilsson, Jonaz

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