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Fizzy Pop Bottles?

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The Vortex | 20:26 Tue 29th Aug 2006 | How it Works
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Does anyone out there know why there are the lumpy bumpy bit on the bottom of cola bottles?
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yes,its so they stand up and dont fall over
lol
The lumpy bits strengthen the base so the bottle doesn't burst if you drop it.
or is it a subtle psychological ploy to make the bottle appear as if it holds more?
Most fizzy drink bottles are made of Polyethylene Terephthalate (PET)

In all bottles made of this there is a small dimple on the bottom of the bottle and, in the case of fizzy drink bottles, a flower-shaped base. This flower shape helps the PET bottle to cope with the pressure put on it by fizzy drinks. The dimple is caused when the bottle is blow-moulded upside down - the dimple is where the plastic was forced into a mould and then cut off.
Do you remeber when they had a black plastic cap on the bottom? they use to be round on the ends and therefore wouldn't standup on the shelves and so had a black plastic cap to keep them upright.
WoWo - My friend says yes he remembers them but I'm younger 25 and so I dont really know them, how long ago do you think they were around?
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Thank you ALL! I can now get to sleep at night!
I remember the black bottom caps used on bottles and Im 25. This must have been 15 years ago and back.
Ahh right I must not remember the black caps because my mum was one of those - "NO we cannot buy crisps and 'pop' like everyone you know from school" which meant I was stuck in the orange squash section on the shop!

Of course as soon as I left home I eat and drank any thing bad for me to get my own back - ha haaaaa!

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