Epstein
Associates - K9APE®
K9APE® Machine Vision Inspection System For
Flat Surfaces
K9APE® Machine
Vision Inspection Systems are readily adapted for inspection of printing on
flat or curved surfaces. Inspection can occur during or after the manufacturing
or printing process.
The image shown below is from a 2 inch (51
mm.) x 4 inch (102 mm) rub test plastic sample. The rub test comprises rubbing
a sample sheet across a portion of a recently printed plastic-coated sheet
under controlled conditions to determine whether the printed ink was properly
applied and dried. With perfect printing, no ink should be transferred to the
sample sheet. The image below illustrates an example where a visible amount of
ink was transferred to the sample sheet.
CLICK ON IMAGE BELOW FOR EXPANDED VIEW
[Image May Take A Few Minutes to Download]
Highly
Compressed Image of A Printing Rub Test Sample Sheet
One objective of image analysis is to
quantify which ink and the amount of ink in a three-color printing operation
was transferred to the sample sheet. Color data from a sample sheet shown above
and from an unused sample sheet were collected. These data were then processed
by differential signature analysis to obtain the chart shown below. These data
quantify the amounts of cyan, magenta and yellow ink transferred to the rub
test sample sheet.
Graph
of Printing Rub Test Differential Signature Analysis
Data can be used to generate output signals
for control of ink pigment/vehicle ratio, press speed, cylinder pressure and
drier temperature. Data can also be logged for warranty purposes or for
conducting experiments on manufacturing variables.
These images were captured with an EPIX®
PIXCI®
Model SV4 Imaging Board. EPIX®
XCAP™
Imaging Software was used for image
formatting. The original files have been JPEG-compressed for display here.
Printing and manufacturing defects are
readily detected and measured by our K9APE® Machine Vision
Inspection Systems. Images better than JPEG-compressed quality can be obtained
during manufacture.
Epstein Associates - K9APE®
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Sheldon
L. Epstein
Chief Engineer & Owner