| dc.description.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 X
1
+ 0,8000 X
2
+ 0,1812 X
3
+ 0,0238 X
12
– 0,2087 X
22
–0,0412 X
X
2
– 0,0175 X
1
X
3
+ 0,0350 X
2
X
3
. Where X
1
is blowing pressure, X
2
32
is blowing time and X
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. | en_US |
