Perfect binding is a glued spine binding method for books and large documents with a short life span or limited use. The spine of the document or book is coated with hot melt glue and a cover is usually added at the same time. The process is achieved with a machine, from small desktop models up to very large production lines. After final trimming the end result is a square bound book.
Limitations can include pages falling out after heavy use as the glue does not penetrate very deeply into the paper. After repeated heavy use the binding can fail or whole sections come detached from the spine. Where this may be a problem there are advanced perfect binding methods like Burst Binding, PUR Binding or traditional threaded section sewing to provide a longer lasting and higher strength bind.