However, one of the other main reason is from processing point of view. Plastic bottles are prepared by a process called blow molding. So, having a concave shape like this below both serves the purpose of hiding the pinch off mark and also provides stability at the bottom for the bottle.
Considering this, why are wine bottles shaped the way they are?
Historically, punts were a function of wine bottles being made by glassblowers. The seam was pushed up to make sure the bottle could stand upright and there wasn't a sharp point of glass on the bottom. It's also thought that the punt added to the bottle's structural integrity.
Also, what is the shape of a bottle?
There are many sizes and shapes of bottles used for wine. Some of the known shapes: "Bordeaux": This bottle is roughly straight sided with a curved "shoulder" that is useful for catching sediment and is also the easiest to stack. Traditionally used in Bordeaux but now worldwide, this is probably the most common type.
Why do plastic bottles have ridges on the bottom?
Soft drink and soda bottles, especially those made of plastic are not flat bottomed. The foot of the bottles usually has 5 bumps (corrugation). 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.
Why do Sprite bottles have dimples?
The Sprite bottle also has the rounded marks called “dimples” to represent the carbonation in the drink. These graphic elements, in conjunction with the green, reinforce Sprite to be “a hit of refreshment.”