: How do big companies can products at large scales? Canning product in small batches can be done using bath or pressure canning. But it takes a long time for canning a small batch. I was wondering how big companies do it at

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What I've seen (on TV, not in person) is typically somewhat different than a home process - the food is sealed in the cans (raw) and then run through a giant pressure cooker, typically on some sort of conveyor system, and spends a number of hours being cooked in the cans at the same time as it's being "canned" (heat-processed to kill bacteria) - at least this seems to apply to canned beans. Labels are applied after the can has cooled.