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It is important to understand how differences in paper properties affect the consumption of printing inks. An
 

Summary: It is important to understand how differences in paper
properties affect the consumption of printing inks. An
ink mileage curve is a plot of the printed optical density
of an ink on a substrate as a function of ink film thick-
ness. The optical density of a print increases from zero
to a saturation value with increasing ink layer thickness
on the paper. The saturation density arises from first
surface reflection [1]. In practice, ink film thickness is
difficult to measure, so ink film coat weight, the amount
of ink in gram per square meter (gsm) of substrate, has
been used to represent the ink film thickness by assum-
ing that the ink film density varies identically for the
same ink.
The mileage curve provides only qualitative information
about the ink mileage characteristics of the ink. To describe
ink mileage quantitatively, it is essential to fit a mathemati-
cal equation to the experimental data. The regression coef-
ficients derived from curve fitting can be related to the
properties of ink and paper [2]. Several models for curve
fitting have been reported by different researchers, among

  

Source: Abubakr, Said - Department of Paper Engineering, Chemical Engineering, and Imaging, Western Michigan University

 

Collections: Engineering