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Coating technology is broadly adopted in industrial and life products. From the traditional textile industry and high-tech production, the textile industry will use the coating method to coat the water-based PU on the clothes to make the clothes waterproof. In the high-tech industry, such as Solar panels, lithium batteries and the multi-layer ceramic capacitors mentioned in this study all use the coating method to produce the inner conductive layer or dielectric layer. No matter what kind of coating operation is used, the uniformity of the coating ( standard deviation) is one of the very important indicator items
This research takes the MLCC foil manufacturing station of Company Y as the research scope, and uses the X-ray non-contact thickness gauge to evaluate whether the thickness standard deviation of the ceramic thin film has been improved. And use the characteristic factor diagram commonly used in general enterprises and the response surface methodology in the experimental planning method to analyze the optimal parameters. First, use the characteristic factor diagram to find out the valuable and invaluable factors after brainstorming through the crowd, and use the response surface methodology to set the reasonable level values of the two valuable factors of viscosity and speed, and then use the statistical software Minitab to perform simultaneous optimization to find the most appropriate production parameters.
After calculation by Minitab, when the viscosity is 473.0715mpas and the coating speed is 9.9143 m/min, the standard deviation of the foil can reach 1.6226 mg, but the actual factory must have a reasonable value display and range. Therefore, using the simultaneous optimization method, when the speed is set below 10m/min and the viscosity is adjusted at 411.3~504.3 mpas, three rolls of foil are verified under the exclusion of personnel differences. The standard deviation results of the three rolls and the software calculation results There are some errors, but the standard deviations are all less than 2mg, and the improvement rate is 100% compared to the 51.8% probability of standard deviation less than 2mg before the improvement. And after the film was put into production, it was confirmed that the change in capacitance value was improved using a box-and-whisker diagram.
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