Some books, especially those with shorter runs (ie fewer copies) will be printed on sheet-fed offset presses, but most books are now printed on web presses, which are fed by a continuous roll of paper, and can therefore print more copies in a shorter time. As the production line circulates, a complete “book” is collected together in one stack, next to another, and another web press carries out the folding itself, delivering bundles of signatures (sections) ready to go into the gathering line. Note that the pages of a book are printed two at a time, not as one complete book. Excess numbers are printed to make up for any spoilage due to make-readies or test pages to assure final print quality.
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