Delamination in Timber Induced by Microwave Energy

Published Date

pp 159-172

Date: 20 October 2010

Title 

Delamination in Timber Induced by Microwave Energy

• Author 

• Georgiana Daian

Abstract

High intensity microwave treatment creates changes in wood structure. The application of intensive microwaves generates the appearance of micro-voids and checks throughout the cross section of wood in the radial/longitudinal grain direction, due to the effect of microwave induced steam pressure on wood micro and macro-elements (Torgovnikov and Vinden 2003). Under microwaves, the permeability of some wood species in the radial direction can be increased by a factor of 170–1,200 times (Vinden and Torgovnikov 2000). For microwave-wood applications, such as wood impregnation, the occurrence of uniformly distributed internal checks is intended. For other microwave treatments designed to create growth stress relief in fast grown plantation hardwoods or to assist and accelerate wood drying, as well as wood bending, the treatment defects (checks, cracks, collapse, splits) have to be controlled and minimized.


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Probing the Wood Coating Interface at High Resolution

Published Date

pp 145-157

Date: 20 October 2010

Title 

Probing the Wood Coating Interface at High Resolution

• Author 

• Adya P. Singh 
• , Bernard S.W. Dawson

Abstract

Wood is a versatile biomaterial used in a wide range of applications. Although wood is strong and durable the products made from it when placed in service, particularly in outdoor environments, can deteriorate within a relatively short time because of exposure to weathering factors, such as solar radiation, rain and decay microorganisms. Application of coatings to the exposed surfaces of wood products, that can prevent solar radiation and water from reaching wood tissues, can provide protection from wood deteriorating factors. Coating adhesion, which is among the factors that play an important role in determining the performance of an applied coating, is related to chemical and physical interactions with wood, the latter involving coating attachment to wood via penetration into surface tissues, where cell lumens and cell wall delaminations have an important role.


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Delamination of Wood at the Microscopic Scale: Current Knowledge and Methods

Published Date

pp 123-144

Date: 20 October 2010

Title 

Delamination of Wood at the Microscopic Scale: Current Knowledge and Methods

• Author 

• Lloyd Donaldson

Abstract

At the microscopic level, wood delamination can be defined as the separation or disintegration of fibres as a result of physical or chemical processes resulting in fracturing. Wood shows complex anisotropic behavior related to its microscopic structure, and this is also reflected in its fracture behaviour (Figs. 6.1 and 6.2). Delamination of wood can occur by intrawall fracture between adjacent tracheids or fibres, or in association with rays, or less commonly by transwall fracture, where the cell lumen is exposed (Koran 1967, 1968; Jeronimidis 1976; Kucera and Bariska 1982; Boatright and Garrett 1983; Côté and Hanna 1983; Zink et al. 1994; Donaldson 1997) (Figs. 6.2 and 6.3). Interwall fracture is a special case of intrawall fracture that occurs within the middle lamella (Côté and Hanna 1983; Zink et al. 1994).

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