Optimization Design of Stretch Blow Molding Process of Medical Microballoon based on Orthogonal Test
Dai Guanghui, Zhang Qingqing, Jin Guobao
College of Mechanical Engineering, Chaohu University, Chaohu 238000, China
Abstract：An orthogonal experiment with factor interaction was designed and implemented with the level range of each factor was further narrowed based on the completion of Taguchi orthogonal test and extreme value analysis, taking the four stretch blow molding process parameters of molding temperature, molding pressure, stretching distance, and holding time as optimization objects to improve the uniformity of wall thickness and molding stability of medical microballoons. The interactive test results show that the interaction of molding temperature and molding pressure, as well as molding temperature and stretching distance, have obvious effects on the wall thickness uniformity of the balloon. The molding experiments and measurement statistics were performed based on the optimized parameters obtained from these two orthogonal tests. It can be found from the comparison that the average value of the balloon wall thickness uniformity under the optimization results of the interactive orthogonal experiment is 96.03%, which is slightly higher than that of the Taguchi orthogonal experiment, and the difference between these two experiments is 0.17%; however, the variance of the balloon wall thickness uniformity under the former test is reduced by 10.58% compared with the latter, which shows the great difference between these two tests and indicates that the optimization results of the interactive orthogonal experiment improve the ball stability of ball molding.
Keywords：medical microballoon; stretch blow molding; process optimization; orthogonal experiment; interaction
Dai Guanghui，Zhang Qingqing，Jin Guobao. Optimization design of stretch blow molding process of medical microballoon based on orthogonal test[J]. Engineering Plastics Application，2021，49(6)：78-83.