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

  • Manoj Kumar Dubey EMAIL logo , Shusheng Pang , Shakti Chauhan and John Walker
From the journal Holzforschung


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.

Corresponding author: Manoj Kumar Dubey, Penn State University, 101 Forest Resources Laboratory, University Park, PA 16802, USA, Tel.: +1-814-8633196, e-mail:


The authors wish to thank Ms. Diahanna O’Callahan of the Scion, Rotorua, New Zealand, for conducting the laboratory decay test. Special thanks to Mr. Kevin Stobbs for his kind help and providing access to the hot press and testing facilities in the Mechanical Engineering Department of the University of Canterbury. Postgraduate Scholarship from New Zealand Aid (NZAID) is acknowledged by the senior author.


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Received: 2015-8-5
Accepted: 2015-12-18
Published Online: 2016-1-29
Published in Print: 2016-8-1

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