It’s added after molding the jugs and the volume is checked, but before the milk is filled.
Comment on I need to vent about plastic milk jugs
smuuthbrane@sh.itjust.works 1 day ago
So how is the dimple added after filling? If it’s to ensure a common fill amount, it would have to be done post-fill.
At least, I can’t figure out how it would be done pre-fill without somehow precisely measuring the volume of the empty jug.
themeatbridge@lemmy.world 1 day ago
smuuthbrane@sh.itjust.works 20 hours ago
So the mold is made, the volume checked, adjusted via an insert, and then they crank out jugs.
That’s plausible, but over-complicated in an age of digital CAD and mature molding techniques.
Sounds like milk bags are vastly superior.
BeardedGingerWonder@feddit.uk 20 hours ago
Apart from when you want to use them.
smuuthbrane@sh.itjust.works 18 hours ago
Spoken like someone who’s never used them.
Trainguyrom@reddthat.com 20 hours ago
That’s a ton of manual labor on a disposable container. Manual labor is extremely expensive, and plastics manufacturing is extremely repeatable and extremely cheap at scale (that’s kind of the big reason plastic is so common, it’s cheap and reliable)
Granted I could imagine a machine which fills it with dyed water, uses a camera to determine the fill level then passes to another machine which adjusts by volume but that’s really going to slow down the production line doing all of that.
Ultimately plastics manufacturing is way more precise and consistent than that, you’ll basically end up with either a milk jug or a misshapen mess if there is a defect, and not really anything in between
roboslap@mander.xyz 19 hours ago
Only the mold is being adjusted, not each individual plastic jug.
FiniteBanjo@feddit.online 1 day ago
It’s assumed that all jugs from a mould hold the same volume, but not every mould holds the same volume, so by aiming high for the initial design of the mould and then adding spacers to the side of the mould as needed you can achieve a modified mould that stores the correct amount.