Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. The operation of cutting sheets from a web or roll of paper. A rotary cutter, which is somewhat similar to a web-fed cylinder press, with a steel cutting edge, is attached along the length of a cylinder, to which the web of paper is fed. At every revolution of the cylinder, the cutting edge cuts a sheet of paper off the roll. Several rolls may be fed to the cutter simultaneously, thus cutting multiple sheets.

Rotary cut paper is usually referred to as "machine trimmed" paper and the cut is sufficient for the requirements of most booklets, pamphlets, etc., that are to be printed "work and turn" and folded as a full sheet. See: IMPOSITION . For printing that is done on a full sheet and then slit, however, "machine trimmed" paper will not always suffice. Broadsides, folders, labels and similar forms of printing that must be accurately trimmed require guillotine trimmed paper. Uncoated paper intended for such printing is usually ordered guillotine trimmed on at least two edges. Coated papers are guillotine trimmed as a regular practice. 2. The formation of a sheet on the papermaking machine. (17 , 198 , 350 )

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