Bleed is when a document is printed larger than is needed in order for it to be trimmed back to its original size after printing. This helps ensure that any background colours or images are printed edge to edge and avoids any unsightly white edges showing.
As the sheet fed material passes through a printing press it has a tendency to move slightly, and only a fraction of a millimeter can result in an unsightly white slither of non-printed area remains. This small movement can also occur on the guillotine, as the final job is being cut down to size – resulting in the same problem.
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