Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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curl

A defect in paper or board, appearing as a curvature in the sheet, caused by "two-sidedness" of the sheet, which results in unequal shrinkage between the felt and wire sides when the paper or board is subjected to changes in relative humidity. In addition, fiber orientation has an influence on the direction and magnitude of curl. The result of curl is the tendency of the paper or board to form a tube (curl)) at the edges, the axis of which is parallel to the machine direction of the material. (17 , 42 , 98 )




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