Abstract. Sublimation trasnfer machine's hot roller, a compression type electronic heater, is made of ceramic core which is wrapped with nickelchromium alloy heater. This roller is insulated with magnesium oxide. When the power is on, the heat is generated. Heat transfers are from high temperature area to low temperature area, and it causes the non-uniform temperature surface and the roller surface distorsion. Such effects always increase with larger diameter of the roller and longer the roller. In order to predict the sublimation transfer machine's roller temperature distribution and validate it, we construct the roller's 3D temperature model and use ANSYS steady state heat transfer analysis module to calculate the power dissipation and simulate it. Final data shall help us to design sublimation transfer machines' roller.
This equipment's temperature uniformity during continuous thermal transfer process has a critical influence on the transferred product. The bigger surface area of the roller, the poor temperature uniformity caused when heating starts. This study focuses on the thermal analysis of these electric tubes in hot rollers when heating. We use ansys steady-state heat conduction analysis to simulate the electric heating tube with the parameters of different electric power and different heating tube position, and to find the optimum temperature uniformity on the hot roller surface. For example, in the case of thermal transfer equipment, the allowable temperature range of the hot heat roller temperature is 4°C. According to the statistical normal distribution point, we know the larger probability and the smaller range gives the better temperature uniformity. So the temperature difference between the highest temperature and the lowest temperature of the measured temperature value must be within ±2 °C. This temperature difference range is also the effective temperature range in which the hot roller can be used. This paper discusses the related thermal theory of hot roller heating system, and uses the finite element analysis to simulate the numerical simulation ,and to know the roller, s thermal uniformity effect, then to get its refining method. When the temperature uniformity in the simulation meets the temperature accuracy specification, the heat roller implementation and temperature measurement are effective to reduce the development time and promote the quality of the equipment.
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