Charts & Datasets
TAPPI has a
solution for dirt -- the kind that gets into your products during the
manufacturing or shipping process.
TAPPI’s Dirt Chart cards estimate the equivalent
black area (EBA) of dirt or other colored specks. The equivalent black area of
a dirt speck is defined as the area of a round black spot on the white
background of the TAPPI Dirt Estimation Chart that makes the same visual
impression as the dirt speck on the material in which it is embedded.
Dirt Estimation Charts are
manufactured from an original negative on Kodak photographic paper. The paper
positive is produced in a NuArc contacting frame with an Olite light source and
Olix light integrator. The light integrator precisely controls the exposure.
Each piece of photographic paper that is produced during the manufacturing
process is evaluated with an X-Rite densitometer for correct exposure.
To ensure the
accuracy of the charts, each piece is measured by examining the .20 dot with a
100 x magnifier that has a reticle (scale) incremented in 5/10,000 mm on the
lens. This opaque chart can be used with TAPPI Test Methods T
437, and T
You want to hear more? Check out TAPPI’s size
estimation chart (for use with Test Method T
564). Developed from the
TAPPI Dirt Estimation Chart, this transparency is used to measure the size of
spots, defects, or inclusions over the range of 0.02 to 5.00 square millimeters
in paper and other industrial materials such as textiles or plastics.
The TAPPI Calibrated Size Estimation Chart is a
great solution for quality control applications where exact dimension specifications are required. Each Calibrated SEC comes with its own data
sheet that provides an actual dot measurement area (expressed in squared mm) to
correspond with the increments (dots) on the chart.
Dirt Estimation Chart (Opaque)
Product Code: 0109DIRT
Member Price: $41
Non-Member Price: $58