Fluid flow in wood: Investigation of the influence of laser incision parameters on uptake and flow paths in four wood species

Morwenna Spear, Jon Holmberg, Subhasisa Nath, David Waugh, Andy Pitman, Paul Mason, Simon Curling, Graham Ormondroyd

Research output: Contribution to conferencePaper

Abstract

Laser incision offers great potential for increasing the permeability of wood to preservative or other fluids. Wood modification systems have a greater requirement for full impregnation than traditional preservative systems, and envelope treatments are not sufficient. The bulking effect of many wood modification systems means that uniformity of penetration by reagents is essential. Therefore laser incision offers potential to increase permeability of timber for wood modification. Experiments were conducted on four species of wood, to investigate the altered flow. These species were southern yellow pine, European beech, Sitka spruce and European redwood.
Blocks were sealed on all faces, limiting fluid uptake to a single laser incision. Laser incisions were made using UV laser, and the depth of focus and number of shots was varied. Pressure treatment was undertaken using an aqueous dye system, and quantities of fluid taken up were recorded gravimetrically, as well as by observation of the dye within dissected wood blocks. This allowed observation and measurement of longitudinal and transverse flow within different planes in the sample.
The significance of the resin canal network was demonstrated in some species (southern yellow pine) while pit aspiration dominated the reduced flow observed for spruce. Hardwood flow is dominated by the vessel network. As a result of these flow observations different incision strategies will be developed to maximise fluid uptake and distribution uniformity in species selected for further study.
Original languageEnglish
Publication statusPublished - 2018
EventTIMBER 2018 - IMO3, 297 Euston road, London, United Kingdom
Duration: 26 Jun 201827 Jun 2018
https://www.iom3online.org/iom/frontend/reg/thome.csp?pageID=451696&eventID=858&CSPCHD=001001000000UMFp2yVSawbzlmZV4pLzpyizjrXF973WViJE$I

Conference

ConferenceTIMBER 2018
CountryUnited Kingdom
CityLondon
Period26/06/1827/06/18
Internet address

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    Spear, M., Holmberg, J., Nath, S., Waugh, D., Pitman, A., Mason, P., ... Ormondroyd, G. (2018). Fluid flow in wood: Investigation of the influence of laser incision parameters on uptake and flow paths in four wood species. Paper presented at TIMBER 2018, London, United Kingdom.