Study On The Numerical Simulation And Improvement Of The Temperature Field Of Wood-based Panel Multi-Hot Press

Plays a decisive role in the formation quality of pressure platen, hot pressing becomes one of the most important parts in the fiberboard production process. Balance of the hot pressing temperature and pressure platen temperature field are the key factors to affect hot pressing efficiency and platen formation. This paper mainly studies the following two aspects to explore the rule about the influence of hot pressing temperature on the hot pressing heat transfer rate of wood-based panel as well as the distribution of the pressure plate temperature field.First,during the hot pressing process of wood-based panels, the heat transfer rate in the plate billet tends to be influenced by various kinds of factors, such as hot pressing temperature, mat moisture content and hot pressing pressure etc., among which hot pressing temperature is crucial one to impact the hot pressing efficiency. Based on heat and mass transfer of hot pressing, this paper makes a research on the regularity of the impact of hot pressing temperature on the heat transfer rate in the plate billet by adjusting the hot plate temperature, so as to provide a reference basis for drawing up a reasonable hot pressing technology parameters for hot pressing specification to improve its production efficiency.Second,balance of the hot pressing temperature field is of great importance to the internal bond strength, elastic modulus, static bending strength and other aspects of the platen formation. Currently, China’s wood-based panel hot-press production has a common phenomenon of unbalanced distribution of hot pressing temperature field, thus with an aim to study learn more about the distribution of hot pressing temperature field and have a further optimization of the platen heating circulation system structure; this paper applies the FLUENT simulation software with the computational fluid dynamics method to simulate the temperature fields of two kinds of platen heating circulatory systems with different pipelines to study the surface temperature distribution regulations, and optimizes the design of the diameter of the single in and single out loop heating system oil line. Finally, the field distributions of the unimproved press temperature with the improved one are simulated and compared by using FLUENT simulation software. The results show that reducing the tube diameter of both sides of the pressure plate can improve and optimize the uniformity of the platen surface temperature distribution which consequently provides the theoretical basis for the hot pressing machine production optimization design of the heating circulation system.