The lids are put on before they're processed.

zxcvbob wrote:
> Mike Stith wrote:
>
>> How do you think non-acidic foods such as meats and fish are
>> "canned"?? They're loaded into giant pressure cookers for processing.
>>
>
> Yes, but when do they crimp on the lids? I have some old canning books
> that deal with using metal cans. I'll look it up tonight, but I think
> the lids are crimped after they come out of the autoclave.
>
> Bob
>