Simulation And Experimental Research On Printing Process Of Gravure Printing Electronics

Printing electronic products have become the focus of research institutions and enterprises at home and abroad because of their large area,flexibility and low cost.Unlike ordinary printing,which takes image quality as the evaluation index,gravure printing takes electronic performance as the core index,which requires higher printing accuracy.Gravure pattern transfer process has become a key factor affecting printing accuracy.In this thesis,mathematical modeling,simulation and experimental research are carried out on the dynamic behavior of electronic pattern transfer process in gravure printing.The main research work and innovations are as follows:(1)Through comparative research,the key index elements of gravure printing electronic technology are put forward.Through the comparative study on the performance requirements,prepress process and plate roller structure between ordinary gravure printing and printing electronics,the key parameters affecting the printing accuracy(minimum line width)of printing electronics are put forward: the geometric parameters of plate roller and doctor blade;Scraper angle and scraper pressure process parameters;Plate roller speed and other key parameters.(2)Based on the assumption that the ink in the ordinary gravure printing process is Newtonian fluid,the rheological properties of the ink are analyzed.Taking the doctor blade as the force body,the action characteristics of driving pressure,positive pressure of plate roller and ink viscosity are analyzed;The force mathematical model of the doctor blade is established,and the relationship among geometric,technological and physical parameters is revealed.(3)The Navier-Stokes equation(N-S equation)describing energy conservation and the continuity equation of momentum conservation are used to simulate the transfer process of gravure electronic pattern.The mesh hole model of plate roller is established.Using the N-S equation and continuity equation,using the established force model of the doctor blade as the loading condition,and using ANSYS ICEM CFD(Computational Fluid Dynamics)software,the pattern transfer process is numerically simulated.The results show that the flow velocity at both ends of the doctor blade reaches more than 4times that of the middle part,and the flow condition of the ink deteriorates at 1 / 2-1 / 3.(4)Based on the contact pressure and micro displacement test,the transfer process of gravure electronic ink was studied.Microcapsule pressure sensitive film is used as pressure sensor,and micro displacement sensor is used to measure the deformation under the action of doctor blade and embossing roller in the printing process.The experimental results show that the uneven deformation of the doctor blade leads to ink marks,which is basically consistent with the position where the deformation of the doctor blade is relatively small in the simulation;When the pressure of the doctor blade reaches a certain value,the increase of the total deformation of the doctor blade will reduce the actual doctor angle and increase the contact area between the doctor blade and the plate roller.To sum up,the key index elements of gravure printing electronic technology involve geometric,technological,physical and motion parameters.The establishment of force model of doctor blade,ink dynamics simulation and experimental research provide theoretical guidance,simulation and experimental methods for the industrialization of gravure printing electronic technology.