On 7/18/2012 8:05 PM, dave wrote:
> hi everyone
> just canned 7 qts of tomato juice in my pressure canner. one of the
> rings and lids popped off the jar, while it was canning. the jar did
> not break and the ring was not bent or misshaped, I was able to screw it
> back onto the same jar and it screwed on tight. I of course threw away
> the lid and ring. has this happened to anyone else?? does anyone know
> why this would happen??

Never had that happen, only thing I can think of is the ring was put on
a little crooked and the internal pressure of the jar finally blew it
off. I would use that jar first and keep it in the fridge until you do.