In the disposing of scrapped material derived from packages, its reduction in the weight of plastic bottle has been not carried out enough. In this case, nowadays, we fi- nally put super lightweight bottle to use. this super lightweight bottle is just made from 2.5g plastic material per 100ml sized bottle which is named OPP bottle. This bot- tle is less 1/2-1/3 than general light bottle. Because we had adapted the method of structure analysis by computer simulation, we have been able to added correctness and speed to its development.
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