|
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."
|
