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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