In this study the effect of press time on springback, thickness swelling and water absorption was investigated. After 24 hours soaking in acetic anhydride, in order to achieving WPG 17%, acetylated particles were heated in an oven at 120 0C for 360 minutes. Acetylated and nonacetylated (control) particleboards were produced with 10% melamine urea formaldehyde (based on the oven-dry weight of particles) at press time of 5,7 and 9 minutes. During pressing operation of particles, heat transfer was measured by thermocouples. Results showed that acetylation reduced both of water absorption and thickness swelling, however, increased springback. Also, increasing of press time reduced water absorption, thickness swelling and springback of the boards.

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