To produce a perfect-bound document, the piece's folded signatures are gathered together in page sequence, clamped together, and placed in a machine that slices about 1/8" off their left edges. Then roughers mill the newly sliced sheet edges to prepare them for gluing. Finally, the edges receive an adhesive application and adhere to a backing.
Perfect binding is well suited for use with books, thick magazines, annual reports, technical manuals, and catalogs. From a minimum thickness of 1/8", it works well with a wide range of document thickness' and trim sizes. However, the paper used should not be heavier than 100 lb. Book stock, with the grain running parallel to the piece's spine.