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Theses

Influences de paramètres d'usinage et de stockage sur les propriétés fonctionnelles des surfaces de bois de Douglas

Abstract : Wood machining is a process that creates new surfaces which have precise functionalities; most of these surfaces receive protection films or glues. It is desirable to directly produce surfaces that enable these coatings to be applied without any over consumption of products and offer a high adhesive power. This research was conducted to classify the influencing factors i.e. cutting speed, storage duration, surface roughness, position into the log (sapwood / heartwood; juvenile wood / mature wood; height into the tree) on the wettability, surface energy, finishing products behaviour for outdoor applications (cladding) and glue bond behaviour for indoor applications (glulam). This research was performed using Douglas-fir and was repeated for two machining processes: routing and sanding. Aging time was found to have a dominant effect on the degradation of surface wettabilities. These surfaces were best coated within a week following their creation. The location of the sample within the log was also found to have a significant effect; this was postulated to be a result of the variation in microfibril angle and the extractives ratio. The cutting speed was found to affect the wettability, but this was less significant than the previous factors and showed the opposite trend for routing as for sanding, where the wettability decreased as the cutting speed increased. This may well be explained by the different thermal reactions induced by the two processes. There was no effect of roughness on the wettability of routed surfaces and a positive effect in the case of sanding. The two machining processes have the same efficiency when considering the finishing coatings behaviour; however it was found that sanding should be preferred for a better glue bond.
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https://pastel.archives-ouvertes.fr/pastel-00004949
Contributor : Ecole Arts Et Métiers Paristech <>
Submitted on : Tuesday, June 23, 2009 - 8:00:00 AM
Last modification on : Friday, July 17, 2020 - 2:55:36 PM
Long-term archiving on: : Friday, September 10, 2010 - 1:31:14 PM

Identifiers

  • HAL Id : pastel-00004949, version 1

Citation

Alex Outahyon. Influences de paramètres d'usinage et de stockage sur les propriétés fonctionnelles des surfaces de bois de Douglas. Sciences de l'ingénieur [physics]. Arts et Métiers ParisTech, 2008. Français. ⟨NNT : 2008ENAM0041⟩. ⟨pastel-00004949⟩

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