That circular dent on the side of a plastic milk jug actually has a few important jobs:
What the dent is really for
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Pressure control:
Milk jugs are sealed and can experience pressure changes from temperature shifts. That dent allows the jug to flex inward or outward so it doesn’t crack or burst. -
Structural strength:
The indentation adds rigidity, helping the jug keep its shape when it’s full, stacked, or being carried. -
Drop protection:
If the jug gets bumped or dropped, the dent can absorb impact, reducing the chance of the jug splitting open. -
Manufacturing efficiency:
It also helps during the molding process, allowing the plastic to cool evenly and use less material without sacrificing strength.
What it’s not
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