تاثير درجه حرارت و زمان پرس بر انتقال حرارت در فرآيند ساخت تخته خرده چوب

The effects of press temperature and time on heat transfer in particleboard process

In order to investigate the effects influence of press time and temperature on development of particleboard strength and reach the minimum energy consumption and_ press time, two press temperatures of 165c and 185c and three press times of 3, 4 and 5 minutes were selected. Heat transfer from the mat surface to core was determined by placing thermocouple at different locations in board thickness. Mechanical properties of boards were determined and the relation between board properties and heat transfer measurement specially time to reach the temperature of 100c at the core was analyzed. The results indicate that press time and temperature did not significantly but the influence of these variables on MOE was significant, and increasing press temperature reduced MOE. The influence of both variables on IB was significant , increasing these variables increased IB. The results of heat transfer measurement indicate that increasing press temperature reduced the time to reach 100° at the core, which caused an increase in IB. This indicates that at higher temperature and press time sufficient time is available for resin to developed bond strength.