Unlike regular glass bottles, plastic bottles are typically designed with a non-flat base, which is considered a manufacturing standard for this product line. This article aims to answer the question of why bottle bottoms are never flat.
1 Increased Stiffness for the Bottle
Most plastic bottles for carbonated drinks feature raised ridges or folds, which enhance their strength and stiffness, technically referred to as increasing the moment of inertia around the bending axis.
In simpler terms, these ridges contribute to the overall strength of the bottle.
2 Ability to Withstand High Pressure
Special structure at the bottom helps the bottle withstand pressure
Carbonated drinks are typically pressurized with added carbon dioxide. When the liquid is chilled and carbonated, its volume changes, which can exert significant pressure on the container.
For this reason, manufacturers design the angles or peaks of the ridges at the bottle’s base to be flexible, allowing them to expand or contract to accommodate this pressure.
3 Maximum Shock Absorption
Maximizes shock absorption
According to manufacturers, the ridged design at the bottom of the bottle also helps absorb shocks if the bottle is accidentally dropped, as it lowers the center of gravity, stabilizing the base and minimizing deformation from impacts.
We hope this article has answered your question about the non-flat design of bottle bottoms. Pay attention to the little details around you—they often hold fascinating secrets!
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