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The final step in the offset printing process is to dry out your bound books. As you see below, all printed books are compactly stacked on top of each other using that pressure to halt pages from warping. This step is especially crucial for hard cover books; due to the moisture added in gluing and lamination, these covers are prone to curving if there’s no pressure to keep them flat while they dry.
Many printers will have a designated drying room with controlled temperature and humidity settings to ensure consistency in drying.