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Tuesday, 3 October 2017

Dimensional stability, fungal resistance and mechanical properties of radiata pine after combined thermo-mechanical compression and oil heat-treatment

Published Date
Published Online: 2016-01-29 | DOI: https://doi.org/10.1515/hf-2015-0174

 Author
Manoj Kumar Dubey
 / Shusheng Pang
 / Shakti Chauhan
 / John Walker

Abstract

The dimensional stability and mechanical properties of radiata pine (Pinus radiata) has been investigated after thermo-mechanically compression (TMC) followed by oil heat-treatment (OHT). Wood specimens were first compressed in the radial direction then heat-treated in a linseed oil bath at 160–210°C. Spring-back percentage, water repellence efficiencies, and compression set recovery percentage were determined as indicators of dimensional stability. The resistance of treated wood against a brown rot fungi was assessed based on an accelerated laboratory fungal decay test. Strength, stiffness and hardness were determined as a function of different treatment parameters. After TMC, high compression set (39%) was achieved without any surface checks and cracks. Specimens undergoing TMC followed by OHT showed relatively less swelling and low compression set recovery under high moisture conditions. The fungal resistance of wood after TMC+OHT slightly increased compared to untreated wood and TMC wood. The mechanical properties of TMC+OHT wood were inferior to those of TMC wood.
Keywords: compression set; fungal resistance; linseed oil; mechanical properties; spring back; thermal modification of wood; thermo-mechanical compression; water repellence efficiency

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About the article

Corresponding author: Manoj Kumar Dubey, Penn State University, 101 Forest Resources Laboratory, University Park, PA 16802, USA, Tel.: +1-814-8633196, e-mail: 
Received: 2015-08-05
Accepted: 2015-12-18
Published Online: 2016-01-29
Published in Print: 2016-08-01
Citation Information: Holzforschung, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/hf-2015-0174.
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