Large Round
Why do plastic milk containers (gallon and half gallon) have large round indents in the side?
These are on every large bottle I buy (this is Michigan, USA) whether it's milk, orange juice, apple juice, lemonade...
The round indents are right in the middle of one or two of the sides, about 3 inch diameter, but indents in diffent bottles very in depth from zero to one inch. Cross section: \___/ (cone sides with flat base).
I've wanted to know for ages and I can't think of a good reason for them - I thought initailly to do with manufacturing process of the bottle... but there would be better ways to add stiffness, and does not explain the varying depths.
There must have a good answer!
The blow mold die that is used has the indentention in them- it adds stability to the container.
Its really cool how these are made- they start out as a little plastic test tube that is placed into a die (think of it as a mold) and has hot air blown into it. Viola! The plastic expands to fit the contours of the mold, and you have a jug!!!
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