- 期刊
應用田口方法優化PE軟管封尾製程
Using Taguchi Method to Optimize the PE Tube Sealing Process
摘要
PE軟管製造過程包含管身擠製、接頭（牙頭射出）、表面印刷上光、出料口鑽孔、封尾製程等步驟。其中封尾製程的熔接強度（welding strength）是軟管最重要的品質特性之一。若是封尾熱熔不良，將造成擠壓PE 軟管時的破裂，並且使軟管內的產品洩漏。早期在開發新產品時，都以試誤法（Trial-and-error）來找出製程參數，不但耗時且不經濟。本研究採用內加熱式封尾（hot air sealing）的製程，配合田口方法的L18直交表，找出PE軟管封尾製程的最佳化參數，以確保PE軟管在承受壓力時不破裂。實驗結果顯示，最佳參數為軟管材質LDPE、熱風溫度440℃、轉盤速度46支／min、加熱頭位置0 mm、加熱頭直徑37.85 mm、夾具位置0 mm、白色母比例6%、冷卻水溫度12℃。影響封尾熔接強度最重要的參數依序為熱風溫度、轉盤速度、加熱頭直徑。經由實驗證實，原始製程參數的氣缸平均壓力為5.8 bar，而優化製程增加為8. 5 bar，可提升2.7 bar。
並列摘要
PE tube manufacturing process includes the extruding, the heading, the printing, the drilling, and the sealing, etc. In sealing process, the welding strength is the one of the most important quality characteristic. If the hot welding of the sealing process is fail, the PE tube may be broken under the pressing, and the inside product will leak out. In the past, Trial-and-error was used to find processing parameters when a new product developed. Hot air sealing process was used in this study, and arranged to the L18 orthogonal array of Taguchi method to optimize the PE tube sealing parameters. This is to ensure that the PE tube is not broken under the pressure. Results show the optimizing process parameter are the tube material LDPE, the hot air temperature 440 ℃, the turntable speed 46 pcs/min, the heater position 0 mm, the heater diameter 37.85 mm, the jaws position 0 mm, the color masterbatch 6%, cooling water temperature12℃. The significant control factors affect the sealing strength is the hot air temperature, the rotating plate speed, and the heating head diameter. Through the confirmed experiments, the average cylinder pressure of original process design was 5.8 bar, and the optimize process was 8.5 bar, the average cylinder pressure enhance 2.7 bar.