This method of binding creates softcover books, so it is the most frequently specified option.
The perfect binder gathers printed sections into order and notches them along the spine edge before they are passed through glue rollers where the cover is then wrapped onto the glued pages. Finally, the book is trimmed along the three open sides to its final size. Notched perfect binding is far stronger than the traditional "milled" perfect binding as the sections remain intact in the spine.
To allow the glue enough grip upon the pages, the cover is hinged so that it opens 8 "away from the spine.
Lay flat binding
Lay flat binding is a type of softcover binding that enables a book to be laid down when being read without the pages closing themselves. It is ideal for manuals and cook books, as they can be referred to "hands free".