News for hackers. Stuff that matters.

A comment on The ingenious design of the aluminum beverage can (2015) [video].

Re:The ingenious design of the aluminum beverage can (2015) ... by litoE on Friday February 03, 2023 @02:08AM (#34638072)
I couldn't figure out from the video at what stage and how is the liquid and the carbonation placed inside. I assume it must be just before putting the lid on, but I don't see how the lid is put on if the contents are generating outward pressure.
[ Parent | on HN ]
Re:The ingenious design of the aluminum beverage can (2015) ... by tastyfreeze on Friday February 03, 2023 @02:39AM (#34638270)
The top sits on the rim of the can then the edge is rolled closed like a tin can. Sealing takes a fraction of a second. There isn't really time for pressure to build under the lid before it is sealed.
[ Parent | on HN ]
Re:The ingenious design of the aluminum beverage can (2015) ... by feyes on Friday February 03, 2023 @03:22AM (#34638645)
They run through a seamer right after the filler. I work in the industry. It's a neat process. The can exits the filler, a lid releases and is seamed just after.
[ Parent | on HN ]
Re:The ingenious design of the aluminum beverage can (2015) ... by londons_explore on Friday February 03, 2023 @10:33AM (#34642384)
Presumably that means if the machine is stopped for a few minutes for maintenance, and then resumed, you need to watch out for a handful of cans where the pressure will have escaped.
[ Parent | on HN ]
Re:The ingenious design of the aluminum beverage can (2015) ... by londons_explore on Friday February 03, 2023 @10:36AM (#34642434)
Carbonation is an odd process... You can carbonate a liquid (by bubbling CO2 through it at high pressures). That liquid, if put in a cup, will slowly lose its carbonation, over a few hours.

If you put a sealed lid on the cup, the pressure will build up inside the cup as some CO2 comes out of the liquid into the top of the cup, till there is an equilibrium and no more gas comes out.

Thats what the canning process relies on. So the can isn't sealed under pressure - the can is sealed at room pressure, and then within a few minutes the pressure builds up inside the can.

Kinda neat!

[ Parent | on HN ]
Re:The ingenious design of the aluminum beverage can (2015) ... by bena on Friday February 03, 2023 @11:59AM (#34643906)
That makes sense as to why two liters go flat faster. The more you drink, the more space in the bottle. The more space, the more CO2 that would be allowed to escape the liquid.
[ Parent | on HN ]