There are several types of binding. When producing printed matter with many pages, such as books and catalogs, you can choose glue binding if you want your printed matter to have a flat glued spine.
Flex binding also uses glue, but at the same time the printing sheets are folded with a perforation in the spine. This allows the glue to penetrate the spine. It is typically used for softcover books and catalogs.
There is a minimum requirement of 2 mm. in relation to the width of the spine if you need to use adhesive or flex binding.
