OPTIMASI WAKTU SIKLUS PRODUKSI KEMASAN PRODUK 50 ML PADA PROSES BLOW MOULDING DENGAN METODE RESPON PERMUKAAN

Abstract

50 ml bottle is being processed by blow molding. There are many parameters that influence cycle time during production; This study aims to determine the influence of process variables, ie blowing time, blowing pressure and stop time of the response variable, namely the cycle time, the net and volume. In addition, to get the value for the optimization of the production cycle time 50 ml bottle while maintaining the value of quality in the bottle, ie the net value and volume. Each parameter is determined three chosen level. Middle level is taken from standard setting of machining which is being used by industry. Top and bottom level is randomized. Three stopping time are 0.5, 1.0, and 1.5 second. Blowing time are 8, 9 and 10 second. Where as, blowing pressures 5, 5.75 and 6.5 bar. Combination of among levels is based on Box Behnken design. Those three parameters are called variable process. In the other hand, variable responses are cycle time, netto and volume. Each combination is replicated 3 times and then averaged. The data then is processed by using Minitab version 16th. Square regression of the model for cycle time is Ŷ_CT = 13,5300 – 0,0412 X₁ + 0,8000 X₂ + 0,1812 X₃ + 0,0238 X₁₂ – 0,2087 X₂₂ –0,0412 X₃₂ – 0,1150 X₁ X₂ – 0,0175 X₁ X₃ +  0,0350 X₂ X₃. Where X₁ is blowing pressure, X₂ is blowing time and X₃ is stop time.The model developed then tested by residual assumption. Second stage of model testing lack of fit test. Optimization of both values, cycle time, netto and volume are searched by Response Surface Method. By the method it is found that the optimum condition of cycle time is 12.60 seconds, netto is 13.34 grams, volume is 89.87 ml The optimum condition is achieved when stop time is 1.5 second, blowing time 8 second and blowing pressure 5.34254 bars.