Key Devices Development And Performance Optimization For Chinese Medicine Plaster Coating Production Line

Chinese medicine plaster is very popular, because there are many advantages, such as largedrug content, good transdermal performance, controllable drug content, good air permeability,and no stimulation for skin. The cost of losses caused by the coating thickness during theChinese medicine plaster production process, is about10%-20%of the total cost. Amedium-sized manufacturer, which produces10million boxes of Chinese medicine plasterper year, will loses1-2million, Because of the coating thickness. So it is very necessary toimprove the coating quanlity and develop the production line. The key to enhance the level ofChinese medicine plaster production is to improve the coating control system.The subject of this paper is ‘Key devices development and performance optimization forChinese medicine plaster coating production line’. The content of this paper includes analysisof the chacracter and manufacture process of the Chinese medicine plaster, analysis of thestatus of the production equipments, and transform the original equipment into automaticproduction line. The new production line should be high-performance, and can precise controlthe coating thickness.In this paper, the structure design of the coating production line was carried outaccording to the demands of the production line system and layout planning. The structuredesign of the coating module and coating thickness dectective module were carried out, andthe key components were calculated. Furthermore, the optimization methods about how toimprove the coating quanlity were gived according to the effective factors of the coatingquanlity. The finite element solfware ANSYS was applied to carry out the simulation analysisof the coating tool, which helped to get the optimal parameter of the coating tool.The control system design also carried out in this paper. PID algorithm was used tocoating tempreture control, photoelectric sensor was used to deviation control, transducer wasused to differential speed control, Gamma-ray thickness gauge and PLC (programmable logiccontroller) were used to coating thickness control, and MITSUBISHI GOT was used tomonitor the real-time parameter of the production line.At last, orthogonal experiment was applied to optimize the dynamic parameters of theproduction line before setting up. And it helped to get the best coating speed, coatingtemperature and coating rate of differential speed.