Paperback or soft cover books or magazines are also normally bound using perfect binding. They usually consist of various sections with a cover made from heavier paper, glued together at the spine with strong glue. The sections are milled in the back and notches are applied into the spine to allow hot glue to penetrate into the spine of the book. The other three sides are then face trimmed. This is what allows the magazine or paperback book to be opened.
CTP has partnered with machine manufacturer, Kolbus, to provide a perfect binding solution to our customers that uses PUR glue. This binding is often used, and gives a result similar to paperback books. National Geographic magazine use this type of binding.