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In this type of thing, its often referred to as a crush fold, dutch fold, hemmed edge, safety edge....
Basically the sheet edge, say 15mm, is folded to about 30degrees , then finally crushed down back on itself, so you end up with a double thickness edge, used for a number of reasons, cosmetic, safety, and strength.
Basically the sheet edge, say 15mm, is folded to about 30degrees , then finally crushed down back on itself, so you end up with a double thickness edge, used for a number of reasons, cosmetic, safety, and strength.