Plastic Comb Binding
Plastic comb binding is good for technical manuals that have a lot of pages and must lie flat. Individual pages are cut down to size, then collated into sets that comprise each individual book. Each collated set (or book) is then punched along the spine edge with a series of holes through which a plastic comb is inserted. The comb curls around the spine forming a cylinder which locks into itself, holding the pages securely in place.
This type of binding can accommodate a large number of pages and has the additional benefit that the plastic comb can be opened to allow pages to be added, removed or replaced with ease.