The Research On Thermal Management Of Wide Format Thermal Printer Based On Thermal History Control Algorithm

Thermal print,as an economical,fast and environmentally friendly printing technology,has attracted more and more attention in recent years.However,due to the lack of further research on its heat transfer characteristics and the lack of derivation method of thermal management algorithm,the application of thermal printing in the field of wide format printing is limited.In this paper,through the combination of theoretical analysis,numerical simulation and experimental verification,the heat transfer model of wide format thermal printer is established and the accuracy of the model is verified.The heat transfer characteristics of thermal printer under three heating conditions are analyzed by using this model.Finally,four thermal management algorithms are deduced,which provide technical support for wide format thermal printer to complete high-quality banner printing.Firstly,based on the basic theory of heat transfer,the heat transfer equation of the thermal print head is derived and the thermal resistance model of the thermal print head is established.The main factors affecting the temperature of the heater are analyzed.It is pointed out that more heat can be used for the melting of dyes as much as possible by reasonably planning the physical parameters of each component.After determining the splicing mode between the thermal print heads,on the basis of simplifying the heater model and the thermal paper printing model,the establishment of the heat transfer model of the thermal printer is completed,and the boundary and initial conditions in the model are set.After meshing,the grid independence is verified.Secondly,the temperature test system of wide format thermal printer is built,and the accuracy of the heat transfer model is verified.The reasons for the error between the measured value and the simulated value are analyzed,and it is pointed out that the influence of the difference in the resistance value and the printed voltage of the hot spot on the power of the hot spot should be considered in the derivation of the thermal management algorithm.Thirdly,three typical heating conditions of the thermal printer are defined,and the distribution of the temperature field of the thermal printer under the three heating conditions is numerically simulated.The basic data for deriving the thermal management algorithm are obtained,and the heat transfer characteristics of the thermal printer are analyzed.Finally,based on the simulation data,the thermal history control algorithm is deduced,and the calculation methods of heat storage coefficient,heating time,cooling coefficient,cooling time and heat transfer compensation coefficient are introduced.By introducing the resistance thermal compensation algorithm and the voltage drop thermal compensation algorithm,the influence of the resistance difference and the printed voltage difference of the hot spot on the power of the hot spot is eliminated.The boundary thermal compensation algorithm is constructed,and the relationship between the heat storage coefficient and the heating time suitable for the hot spots in the splicing area between heaters is derived,which solves the stitching problem of wide format thermal printing.