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Microwave-treatment of frozen wood packaging material
Henin, Jean-Marc; Bauduin, Aline; Leyman, Michaël et al.
2012IUFRO 2012, Conference division 5 Forest Products
 

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Keywords :
wood packaging material; dielectric treatment; microwaves; ISPM15; frozen wood
Abstract :
[en] As part of the wood packaging material (WPM) regulation in international trade, the dielectric heating (DH) is soon to be included in ISPM15 (IPPC 2009) as an approved phytosanitary treatment. It has been considered that when using dielectric radiation (i.e. microwaves or radiofrequencies), reaching 60°C or more throughout the entire profile of the wood during at least 60s (i.e. 60°C/60s) ensures the eradication of any noxious organism present in the wood. Regarding the treatment itself, the main requirements mentioned in the draft of ISPM15 Annex 1 (IPPC 2011) concern the way to achieve “uniformity of heating” as well as the treatment duration, which must not exceed 30min. Concerning wood characteristics, the only restriction to the DH concerns the thickness of the wood pieces, which must not exceed 20cm; no other restriction exists regarding wood moisture content, density or initial temperature. As reported in the draft of ISPM15 Annex 1, it is generally considered that “when using microwaves as a heating source, the coldest part of the wood is the surface”. This statement implies that achieving 60°C (or more) during 60s at the surface of the wood should guarantee compliance with IPPC requirements (i.e. 60°C throughout the profile of the wood). However, since ice and liquid water exhibit very different properties towards microwaves, initially frozen wood (9cmX9cm and 17cmX17cm in cross-section) was irradiated in a 28.8 kW microwave oven (2.45GHz) in order to assess whether achieving 60°C/60s at the surface of less than 20cm-thick planks ensures higher core temperatures. The temperature pattern observed after the treatment was compared with the one observed after the treatment of initially thawed wood pieces. It was observed that, in some conditions, initially frozen pieces exhibit inside temperature (much) lower than 60°C, despite complying with 60°C/60s all over the surface of the wood. These results show that when wood is heated with microwaves, its coldest part may not be the surface. Our results also strongly suggest that the impact of wood properties on post-treatment temperature pattern should be further investigated in order to better identify the limits of the DH (at least on frozen wood).
Research center :
Département de l'Etude du Milieu naturel et agricole (DEMNA)
Disciplines :
Phytobiology (plant sciences, forestry, mycology...)
Author, co-author :
Henin, Jean-Marc
Bauduin, Aline
Leyman, Michaël ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Jourez, Benoît ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Hebert, Jacques ;  Université de Liège - ULiège > Forêts, Nature et Paysage > Gestion des ressources forestières et des milieux naturels
Language :
English
Title :
Microwave-treatment of frozen wood packaging material
Alternative titles :
[fr] Traitement par micro-ondes des bois d'emballages gelés
Publication date :
12 July 2012
Number of pages :
12
Event name :
IUFRO 2012, Conference division 5 Forest Products
Event organizer :
IUFRO - International Union of Forest Research Organisation
Event place :
Estoril, Portugal
Event date :
July 8-13th 2012
Audience :
International
Name of the research project :
Traitement par micro-ondes des bois d'emballage
Funders :
Service public fédéral Santé publique, Sécurité de la Chaîne alimentaire et Environnement + Service publique de Wallonie
Available on ORBi :
since 11 January 2013

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