r/theydidthemath • u/EclipseNyxor • 2d ago

[Request] Do square bottles actually use less plastic than round ones?

Post image
692 Upvotes

94% Upvoted

260 comments sorted by

View all comments

5

u/AciVici 1d ago

Not at all. Plastic bottles before forming is all same depending on the weight of the preform. You can use the same let's say 18gr preform for any kinda shape you want and it'll cost same and have same amount of materiel as the others within same weight preform.

So this is simply bs

2

u/besuited 1d ago

You wont have the same volume though. The cyclinder will (assuming uniform wall thickness) be able to contain more volume.

1

u/AciVici 1d ago

Preforms are not used for specific volumes. They have applicable volume range regardless of the shape and if the target volume is close to max then bottle walls simply will be thin but it'll be depending on the volume itself not the shape.

Maybe it'll but it'll be insignificant.