Which type of seam is used on a tin cans?

In the canning industry, a double seam is a type of seam used to seal the ends of tin cans. It consists of two interlocking seams that create a hermetic seal, preventing the ingress of air, bacteria, and other contaminants into the can. The double seam is formed by rolling the flange of the can end over the body of the can and then folding the rolled flange back over itself, creating two layers of metal that interlock. This interlocking seam provides a strong and reliable seal that maintains the integrity and quality of the canned food.