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EFFECT OF MICROWAVE RADIATION AND PRE-STEAMING ON THE CONVENTIONAL DRYING CHARACTERISTICS OF FIR WOOD (ABIES ALBA L.), A GYMNOSPERM SPECIES WITH TORUS MARGO PIT MEMBRANE

Hadi Dashti, Asghar Tarmian, Mehdi Faezipour, Mahdi Shahverdi

Abstract


In this research, effect of microwave and steaming pretreatments on drying rate and residual stresses of fir wood (Abies alba L.) was investigated. For this purpose, the wood samples with green dimensions 340 × 100 × 50 mm and initial moisture content of about 50% were exposed to the steam and microwave radiation before being conventionally dried. The pre-steaming was performed at temperatures of 120, 140, and 160°C for 1 hour and the microwave treatment was applied with 2450MHz frequency for 7 and 10 minutes at three different conditions. Results revealed that the pre-steaming at 140 and 160°C and the microwave radiation for 10 minutes had a greater effect on the drying rate. The residual drying stresses were reduced due to the   microwave radiation; in contrast, they were increased as a result of steaming at 140 and 160°C.

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