blisters
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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