Perfect binding is probably by far the most commonly used type of book binding today. In perfect binding, the entire raw block is glued into a cover folder. The so-called hot melt glue holds the paper sheets together as well as the book block and the cover at the same time.
Unlike most other types of book binding, perfect binding is also suitable for thicker books up to 50 mm.
However, since books with perfect binding are subject to a lot of stress if they are opened too wide, they should only be digitized with book scanners that have a gentle book cradle.