Softbound books can be bound in several available styles. Currently, the most popular is the Perfect Bound or wrap around cover. Perfect binding utilizes a hot glue process and allows for both front, back, and spine imprinting, in most cases. Note that because the adhesive adheres the cover directly to the pages, this is not considered a “lay flat” option. While these attractive softbound books may be done in any thickness, the durability of perfect binding declines in books containing more than 300 pages.  The perfect binding method for softbound books is commonly offered in no fewer than 100 book orders, as smaller runs are not cost effective utilizing this method due to set up charges.

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This section is drawn from
http://www.gregathcompany.com/sb/perfect.html

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