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Table 1. Typical Drying Times for Various Hardwood Products Dried Using Conventional and Several Different Types of Vacuum Drying Technology Species Produ ct Initial State Drying Time ( days) Reference Conventio nal Vacuum Superheated steam Plate n High Frequency Microwa ve Hardwood Yellow Birch 4/4 8/4 Green Pre-dried Green Pre-dried Green White Oak 8/4 Green Green 4/4 Pre-dried Red Oak 40-45% 8/4 Green 8/4 green Mixed of Oak 5/4 Green Green 13 85-95 25-30 18-22 Mottonen 2006 Fortin 1998 Fortin 1998 Fortin 1998 Fortin 1998 Fortin 1998 Avramidis et al 1994 Harris and Taras (1984) Fortin 1998 Fortin 1998 Fortin1998 Fortin 1998 Fortin 1998 Fortin 1998 and Yamsaengsug 2005 15-20 - 7-8 - 35-40 - 20-25 - 30% - - Green 30 6 2-2.5 - - 1-1.5 - - 6-7 - - 1.5-2 - - - - - Fortin 1998 Fortin 1998 Fortin 1998 Fortin 1998 Fortin1998 and Yamsaengsug 2005 - - - 5 - - - 30 - - - 8-9 - - - 43 - - - - - 28-30 - - - 4 - - - 42 - - 3 - 10-14 5 1.6 0.6 - 6-9 3-41- - 30% - - - - - Satho 85-95 63 days Green 30-35 8/4 Pre-dried 15-20 4/4 Pre-dried Hard Maple Trembling Aspen Black Locust Beech Blue spotted gum 8 2.5-4 5-6 3 6.2 - - - - - - - - 1 - - 30% - 4/4 Green 10 3 - 4/4 Green - - - 8/4 Green 30 - 7 Satho 2x6 Green 2x8 - 2x10 - 8/4 Green Green 4/4 Green 4/4 Green 6-7 1.5-2 -- -- 7-10 2-4 5-2 61 25 - - - - - - - - - - - - - - - - - 4.5 - - - Leiker and Adamska (2004) Satho and Yamsaengsug 2005 Fortin 1998 Fortin 1998 Fortin 1998 Satho and Yamsaengsug 2005 Welling and Riehl 1999 Leiker and Adamska (2004), Redman (2011) 11PDF Image | Impact of Vacuum-Drying on Efficiency of Hardwood Products
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