Bookbinding and the Conservation of Books
A Dictionary of Descriptive Terminology

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1. Bubbles or pockets of air, water vapor, solvent vapor, etc., trapped between the board and PASTEDOWN of a book, causing the board paper to bulge, forming a blister. A blister effect may also be caused by a small mass of adhesive, which stretches the covering material, or by failure of the covering material to adhere properly, causing a protuberance or "blister" between board and covering material. 2. Defects in paper resulting from too rapid drying of the web or poor condition of the drying felts which allows air between the felt and web. Blisters are also defects in coated papers caused by too rapid expansion of moisture in the interior of the sheet when subjected to the high drying temperatures of web presses. (5 , 17 )

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