Drying Process And Drying System Research Of Gravure Printing Machine Based On Heat Pipe And Heat Pump

With the development of society,people’s requirements for matters are getting higher and higher,and exquisite packaging can attract customers’ attention.As the main method of flexible packaging production,gravure printing machine exists the problems of high energy consumption and large amount of thermal energy waste.“Made in China 2025” has repeatedly mentioned quality improvement and efficiency,and pointed out in the green development policy to improve resource utilization.Energy saving and consumption reduction have become a social issue.Therefore,optimizing the gravure drying system and improving resource utilization have become the development direction of gravure printing enterprises.In this paper,the purpose of improving the resource utilization rate of the drying system is to establish the heat demand model inside the drying oven of the gravure printing machine by analyzing the drying principle and drying method of the drying process.And analyze the factors affecting drying and establish a mathematical model of solvent diffusion.The FLUENT software is used to numerically analyze the fluid in the dryer to obtain the temperature field and velocity field inside the dryer and the nozzles,and the temperature value of the drying box exhaust port.According to the simulation results at the wind nozzles,the experimental model of single-air nozzle impinging jet is developed to study the influence of the shape and distance of the nozzle and the radius of the nozzle on the surface temperature distribution of the printing product,which provides a reference for the design of the drying chamber nozzle structure.The simulation analysis shows that the temperature of the exhaust vent is high and has the value of reuse.Aiming at the problem of waste heat waste,the influencing factors of heat pipe heat transfer capacity and the working principle of heat pump are studied,and the optimization scheme of gravure drying system is proposed.Heat pipes and heat pumps are applied to the gravure dryer drying.The heat transfer capacity of the heat pipe and the reverse circulation principle of the heat pump are utilized to absorb waste heat of the exhaust gas to achieve energy saving and consumption reduction.