Perfect binding is an adhesive based binding. It is the easiest and least durable way to produce books, and is how most paperback books are bound. 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 and are glued instantly inside a card cover.
Perfect binding often used for books and thick magazines, catalogs, annual reports and technical manuals. From a minimum thickness of 1/8", it works well with a wide range of document thicknesses and trim sizes. However, the paper used should not be heavier than 100# Book stock, with the grain running parallel to the piece’s spine.
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