School of Agriculture, Food and Ecosystem Sciences - Theses

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Start date: 1960 × Subject: Drying × Subject: Veneers and veneering × Subject: Microwave drying × Author: Wahyudi ×

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    Microwave conditioning and drying of wood veneer
    Wahyudi ( 2000)
    Several aspects of microwave veneer drying are described. The final moisture content profiles and quality of two dried veneer thicknesses A and B (3 and 1.5 mm in thickness respectively) are determined. Veneer gluability of the two veneer thicknesses, dried by two different methods, are examined. The dimensional stability of veneer and plywood samples made from these dried veneers are also examined. Green weight per unit area was used as an indicator of moisture content during drying. A wide variation in final moisture content of dried veneer was found to be due to the presence of earlywood and latewood in veneer sample A and juvenile wood in veneer sample B. Green veneer sorting, based on water content per area or volume, green weight per area and percent saturation, can be used to improve drying performance. Statistical analysis indicates that the final veneer moisture content profiles estimated from green weight per unit area for two dried veneer thicknesses A and B dried by microwave, are not significantly different from those under conventional drying. However, the result indicates that microwave drying resulted in a higher degree of moisture content uniformity for both veneer thicknesses, whereas excessive drying occurred on the outer sections for both veneer thicknesses under conventional drying. A dark color was found in the dried veneer of both thicknesses under microwave drying compared to those of conventionally dried veneers. Statistically, both drying methods resulted in similar veneer quality, except microwave drying resulted in better veneer quality with respect to flatness, and has a low flatness ratio. Microwave dried veneer also had low percent shrinkage for both veneer thicknesses compared to conventionally dried veneer samples. Veneer gluability for veneer A is better than for veneer B, higher in the percentage of wood failures and greater glueline shear strength. Microwave drying resulted in better veneer gluability. Although microwave-dried plywood samples had a higher percentage of water absorption for both veneer thicknesses compared to conventional samples, they had lower percentage thickness swelling. In addition, the percent failure did not represent the glue bond quality of plywood samples.