What is the lock-seam can

Lock seam is featured a special construction: a joint between two sides of metal sheet, made by folding up the overlapping edges against each other, then folding them over in the same direction a number of times. Normally using this process to make chewing gum can, candy can, pencil case, coin can, battery jacket, biscuit can, craft can, fancy can, or other metal packaging for packing the gift, such as wine, cigar, etc.