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A toner's optical density is determined by plotting the milligrams of toner on each square inch of a number of fused test patches, as a function of each test patch's optical density.
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Toner Optical Density Test
A toner's optical density is determined by plotting the milligrams of toner on
each square inch of a number of fused test patches, as a function of each test
patch's optical density.
First, a portion of the toner batch to be tested is uniformly distributed onto a
preweighed, 4-inch square of bond paper, as by using a cotton ball. This toner is
then fused to the paper by the application of heat.
The paper is then cut into 2-inch test patch squares, and each square is
weighed to determine its toner content in milligrams per square inch.
The average percent reflectance over the total area of each 2-inch fused test
patch is then measured, as by using an XL20 Colorimeter (product of Gardner
Laboratory Equipment Company). The optical density for each test patch is
calculated from this data.
The optical density of this batch of toner is then characterized by plotting the
milligrams of toner per square inch as a function of the calculated optical density
for each of the test patches.