Abstract

Samples of Norway spruce ( samples was performed in a wave guide under various frequency and treatment time. After treatment, samples were taken and modulus of elasticity and water uptake studied. Scanning electron microscope (SEM) was used to reveal the changes in the wood structure caused by the treatment. The most probable way of “checking” due to HF treatment is along the middle lamella and secondary wall S1 interphases that represent weak points in the cell wall structure and where obvious cleavage occurred. The checks in the middle lamella/S1 interphases of the cell walls were narrow, i.e. 1 followed the entire circumference of the cell. In general the lumen surface seems not modified due to the high frequency and temperature. It is probable that certain modifications in the structure of the wood polymer complex also occurred due to hemicellulose thermal degradation. The above mentioned structural changes facilitated the penetration of liquids. The water uptake of the treated samples was doubled compared to the untreated controls. As expected, some changes of the modulus of elasticity were inevitable, i.e. the modulus of elasticity decreased with 10% after the treatment. The studied MW energy has also potential in the pulp and paper industry where spruce chips can be more easily impregnated with chemicals after MW treatment. This for examples can save treatment time and energy for refining and defibration of chips.Picea abies Karst.) were treated by microwaves (MW). The treatment of spruce−2 m and often

Keywords: permeability, wood anatomy.Bordered pits, mechanical properties, microwave impulse mode, microwave treatments,

Published in

Title: Wood the best material for mankind
ISBN: 978-80-968868-6-9
Publisher: Arbora Publishers

Conference

"Wood:The best material for mankind" and the 5th International Symposium on the "Interaction of wood wirh various forms of energy"

SLU Authors

• Terziev, Nasko

  • Department of Forest Products, Swedish University of Agricultural Sciences
    

• Daniel, Geoffrey

  • Department of Forest Products, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Forest Science


Permanent link to this page (URI)

https://res.slu.se/id/publ/42445