IBM InfoColor 70, User Manual

Page: 19 / 64

Basic Paper Types and Their Properties
13
Paper properties
Watermarked paper With a roll similar to an embosser,
paper, that is still very wet in the paper
machine, is processed. This causes
thickness variations that creates
different transparency levels.
Translucent paper Paper which is highly transparent due
to a special way of crushing the fibers.
Feature Description
Paper property Description
Weight In grams per square meter (g/m
2
).
Caliper Thickness of the paper expressed in
µ
m.
Absolute moisture content The absolute moisture content is the
ratio between the total amount of water
in the paper and the weight of the paper
(including fibers, fillers, binders and
water).
Relative moisture content The relative moisture content equals the
relative humidity of the surrounding air, in
equilibrium with the paper.
Smoothness A paper property characterized by the
roughness value, i.e. the size of tips and
valleys on the paper’s surface measured
in PPS
µ
m, Bendtsen, Bekk, or sheffield.
Brightness Total amount of visible light reflected by
the paper. Adequate paper brightness is
necessary to provide high-contrast
images.
Bulk The thickness of paper, in terms of the
number of pages per inch for a given
basis weight.
Formation The formation of paper depends on the
structure of cellulose fibers, which, in
turn, depends on the construction of the
paper machine and the composition of
the pulp.
Opacity Opacity is the opposite of transparency.
The lower the opacity, the more you can
see through the paper. Thin papers
usually have a lower opacity.
Gloss The amount of incident light under a
certain angle that the paper reflects with
the same angle.