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COATED BOOK papers
are free sheet papers specified for magazines, catalogs, calendars, and
posters-- anything in which reproduction quality requirements are high.
Coated papers reproduce much finer halftone screens with sharper definition,
better density, and greater color fidelity than uncoated papers.
The
coatings cause ink to dry on the surface of the paper instead of being
absorbed into the fibers. This is called "ink holdout," and it makes for
brighter colors and sharper photos. Coated paper finishes run from dull
to very glossy, have a greater affinity for printing inks, greater smoothness,
higher opacity, and better ink holdout than coated papers. The ratio of
stock to coating in a typical North American coated paper is 70:30.
DRAWBACKS
to using coated papers stem from the fact that they're generally harder
to make, print, bind, and recycle than uncoated papers. Gloss-coated papers
(as opposed to matte or dull) produce glare and eyestrain. Bits of coating
that pull away from the paper surface can cause hickeys. Coatings can
crack when folded. They can interfere with binding glues. They are difficult
to extract and dispose of during recycling.
COVER
papers are heavy, durable papers for the outer covers of books and catalogs.
They can also be used for postcards, presentation folders, and other jobs
that need to be made of heavyweight paper. Paper mills very often match
cover papers to their bond, text, and book papers to make it easier for
designers to specify them.
Not
all covers are made from cover papers, however: the cover of a magazine
or a catalog could be any paper that's sturdier than the inside pages.
When a publication's cover is printed on the same paper as the inside
pages, the publication is said to be
a "self- cover."
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