Soft drink and soda bottles, especially those made of
plastic are not flat bottomed. The foot of the bottles usually has 5 bumps (corrugation). The bottles are not designed so to give it a fancy look. This post details you about the engineering in bottles. You
will not find these bumps in water bottles or juice bottles. Water bottles have small indents to improve the stability of the bottle.The bumps or the corrugations in the foot of the bottle increases the strength of the bottle. Take a sheet of paper and fold it. You can easily fold the paper. Now bend any one side of the sheet and try to fold it. You will now feel some resistance. Now, roll the paper into a pipe and try folding it. It will be little hard to fold the paper pipe. Bending any material increases its strength and rigidity. This is because; rolling the paper increases its moment of inertia around the bending axis.
Soft drinks are served chilled. When a liquid is cooled, its volume changes and the bottle must not buckle because of this change in volume. The corner or the tip of the bump can slightly expand/contract without breaking which takes care of the change in volume of the liquid.
One more reason
is that most of the soft drinks are pressurized by filling gas; the plastic
bottle must be able to withstand the pressure. It should also absorb the shocks
when you accidently drop down the bottle. Next time you buy a soft drink, try
crushing the bottle. You can easily crush the top part but you will find it
hard to crush the foot of the bottle. This foot also improves the stability of the bottle.
The size of the bottle goes on decreasing towards the top; this is to lower the centre of gravity. Doing so improves the stability of the bottle. In Cans, the bottom is arched inwards which again gives good stability to the can.
There are a
number of patents and a lot of engineering behind the foot of the bottle.
1 comment:
Thanks bro.....it's helpfull.
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