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Application of a new method to select the most suitable wood species for surface densification.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-1489-0839
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Wood Science and Engineering.ORCID iD: 0000-0002-4526-9391
2016 (English)In: New Horizons for the Forest Products Industry: 70th Forest Products Society International Convention, June 26-29, Portland, Oregon, USA, Madison: Forest Products Society, 2016Conference paper, Published paper (Refereed)
Abstract [en]

Surface densification improves many properties of solid wood, and opens up new applications for low-density species e.g. flooring or wooden structures, and adds value to these species. Research into the surface densification of wood has been focused mainly on Scots pine, Norway spruce, aspen and poplar. In order to propagate the use of surface densification techniques, it is necessary to find more wood species that have a particularly high potential for an increase in value through such a treatment.The purpose of this study was to select wood species which are suitable for surface densification and for use in a specific product, by applying a systematic and quantifiable selection method. The method that was presented in detail in an earlier work, is designed around a workflow consisting of multiple stages, takes into account weighted selection criteria and provides a quantified ranking of the most suitable species.The results suggest that several species such as alder, basswood, cedar, and obeche that have not previously been considered for surface densification may be suitable candidates. Aspen, poplar and pine were confirmed as suitable, being among the top species in the ranking.

Place, publisher, year, edition, pages
Madison: Forest Products Society, 2016.
Keyword [en]
Forestry, agricultural sciences and landscape planning - Wood fibre and forest products
Keyword [sv]
Skogs- och jordbruksvetenskap samt landskapsplanering - Träfiber- och virkeslära
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
URN: urn:nbn:se:ltu:diva-40694Local ID: feba3b52-2111-4497-a812-5b7ae64e89a1OAI: diva2:1014215
Forest Products Society International Convention : 26/06/2016 - 29/06/2016

Godkänd; 2016; 20160712 (dicsan)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
In thesis
1. Surface-Densified Wood: From Laboratory-Scale Research Towards a Competitive Product
Open this publication in new window or tab >>Surface-Densified Wood: From Laboratory-Scale Research Towards a Competitive Product
2016 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

For many decades, humans have been consuming more resources than the world has to offer in the long run. Increasing the use of renewable materials, such as wood, is essential if we are to achieve a sustainable use of the resources available to us. Densification of wood in general, and surface densification in particular, has the potential to improve the properties of widely available low-density wood species, opening up new fields of application, and fostering the use of wood products in general.

The objective of this thesis is to put past research within the field of surface densification of solid wood and advancements within the present project into a context, and to suggest a path towards a performance-driven and cost-effective type of product. A prevalent research gap has been identified and this thesis summarizes how this gap can be filled by already conducted and future studies. Important aspects that need be handled in order to fulfill the overall vision of the large-scale commercialization of surface-densified wood products are considered.

Past studies were successful in gaining a good understanding of different approaches to the densification of solid wood, such as using a hot press or a friction welding machine. Problems, such as the moisture-induced recovery of the densified wood cells could be solved from a technological perspective. However, those studies did not take into account industrial implementation. Existing methods are time- and/or energy-consuming. The use of roller-pressing equipment showed promising results, but also highlighted certain limitations. Solid wooden boards have been successfully surface-densified at speeds of up to 80 m/min. However, problems arose regarding the plasticization and stabilization of the densified wood cells, indicating that a continuous belt-press approach might be more viable with regard to the objective of industrial implementation.

In parallel, a structured method to identify the most suitable wood species for surface densification has been presented, with the aim of propagating the use of surface-densified wood products and widening their fields of application. This method has confirmed the suitability of previously used wood species, and has also suggested alternatives not considered thus far.

Previous studies into the surface densification of wood have provided a rather sound understanding of the densification process and have provided a useful foundation for the current project. The work done, thus far, has shown the viability of a continuous densification process and has indicated a sensible path towards the widespread establishment of surface-densified wood products on the market. 

Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2016. 60 p.
Licentiate thesis / Luleå University of Technology, ISSN 1402-1757
National Category
Other Mechanical Engineering
Research subject
Wood Science and Engineering
urn:nbn:se:ltu:diva-60282 (URN)978-91-7583-757-4 (ISBN)978-91-7583-758-1 (ISBN)
2016-12-15, Hörsal A, Hus A, Luleå tekniska universitet, Skellefteå, 10:00 (English)
Available from: 2016-11-14 Created: 2016-11-10 Last updated: 2017-11-24Bibliographically approved

Open Access in DiVA

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