Effect of Microwave treatment on longitudinal air permeability and preservative uptake characteristics of chir pine wood

Abstract

Low permeability of many wood species due to their anatomical properties causes problems during timber drying as well as impregnating with preservatives and resins. Microwave (MW) treatment influences heartwood permeability and improves preservative uptake and distribution. In the present study, microwave treatment of chir pine (Pinus roxburghii) wood was done at 2,45 GHz frequency at different level of intensity and radiation time. The gas permeability of chir pine wood was measured in an in-house built apparatus. Preservative uptake was tested using acid copper chromate (ACC) preservative by a dipping process. The effect of radiation intensity and time on preservative uptake and air permeability were studied. The results revealed remarkable increase in longitudinal wood air permeability and preservative uptake with the increase of intensity and time of treatment. The results indicate that this technology can be tested and applied on pilot scale for application in wood preservation industry.

Specific gas permeability of normal and nanosilver-impregnated solid wood species as influenced by heat-treatment

“…Different methods have so far been used to determine permeability in wood and wood composites (Poonia et al 2016). Longitudinal gas permeability measurements were carried out by an USPTOpatented apparatus equipped with an automatic-time-measurement device with millisecond precision (Taghiyari et al 2012).…”

“…Effect of heat treatment from various perspective is quite elaborated during the past decades (Ayata et al 2017, Salman et al 2017. However, little research has been done as to the effects of heat treatment on permeability as an important physical property in solid wood species (Poonia et al 2016). Therefore, a primary objective of the present project was to find out the effects of heat treatment at different temperatures on gas permeability in some hardwood and softwood species.…”

Effects of different incising pretreatments in improving permeability in two refractory wood species

“…There are also some studies on various non-biological permeability enhancing methods. These include the cryogenic treatment (Yorur and Kayahan 2018), extraction treatment (Iida et al 2002), microwave treatment (Listyanto et al 2013;Xu et al 2015;Poonia et al 2016;Terziev et al 2020), pre-compression (Chech 1971Watanabe et al 1998;Kortsalioudakis et al 2015), pre-freezing (Erickson and Peterson 1969;Cooper et al 1970), pre-steaming (Simpson 1976;Harris et al 1989;Hansmann et al 2002;Dashti et al 2012), and smoke heating (Ishiguri et al 2003). There are also studies that focused on bleach (sodium hypochlorite (NaClO)) and acid treatment (Yıldız et al 2008).…”

A new method for determining air permeabilities of wood-based panels

“…Several methods for measuring the air permeability of wood have been developed (Resch and Echlund 1964, Choong and Fogg 1968, Petty and Puritch 1970, Perré 1987, Siau 1995, Perré 2007, Ai et al 2017. Using these methods and similar methods, the air permeability of various wood species in various directions has been determined (Resch and Echlund 1964, Choong and Fogg 1968, Comstock 1970, Perré 1987, Matsumura et al 1994, Fujii et al 1997, Lihra et al 2000, Rayirath and avramidis 2008, Tanaka et al 2015, Poonia et al 2016, Taghiyari and Avramidis 2019.…”