I don’t see why e.g. canned green beans or peas couldn’t just be packaged as they are. Is it a food safety thing? Because it adds a lot of weight to each can…
(I hope the flair fits… I wasn’t sure where to put it as I’m not sure if it’s a biological or an engineering problem.)
In: Engineering
You can’t can “air”. The can has to be full, of something that doesn’t get smaller when it cools from canning temperature to room temperature.
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