Xerox 6180N Generic MICR Fundamentals Guide  - Page 137

fused to the paper by pressure alone. The image bonds poorly

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Security Fabric ribbon inks also soak into and around paper fibers. How much the inks soak in depends on how new the ribbon is. As the ribbon is reused, ink levels are depleted and the image does not bond as much to the paper. At this point, the image is easier to remove. Some images printed with fabric ribbon are impossible to remove, while others can be removed with a damp finger. - A mylar ribbon is used only once. It carries a waxy or jelled layer of ink that is designed to transfer completely to the paper when struck with enough force. The result is a transferred image that bonds well to the paper. Mylar ribbon ink is not as liquid as the ink on a fabric ribbon. Some of the ink from the impact printed image penetrates into the paper, but the ink sits higher on the page fiber than it does with a lithographic image. Generally, the waxy nature of the mylar ribbon inks resists bleaches. Altering an impact printed image has different results, depending on the nature of the inks and the pressures that are used. In some cases, mylar ribbon images bond so poorly to the paper that they can be removed with sticky tape. With enough pressure and the proper inks, the image can bond well, but it is still vulnerable to picking tools. Cold pressure fix Cold pressure fix is used by some non-impact printers. Dry ink is fused to the paper by pressure alone. The image bonds poorly to the paper, but it is relatively well compacted and bonded to itself. The dry ink rests on the surface of the paper and is highly bonded only to the top layer of paper fibers. The image may be picked away without leaving much residue. Xerography Xerography is a printing process that uses heat and pressure to melt and fuse thermoplastic dry ink to the paper. The pressure applied during fusing forces the dry ink into the paper. This process makes the ink very difficult to remove without detection. A xerographic dry ink image is also difficult to alter chemically, because the colorant material is well protected by its plastic binder. Even in a well-designed printing system, some factors affecting the dry ink to paper bond remain under user control. Generic MICR Fundamentals Guide 8-9

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Security
Generic MICR Fundamentals Guide
8-9
Fabric ribbon inks also soak into and around paper fibers.
How much the inks soak in depends on how new the
ribbon is. As the ribbon is reused, ink levels are depleted
and the image does not bond as much to the paper. At
this point, the image is easier to remove. Some images
printed with fabric ribbon are impossible to remove, while
others can be removed with a damp finger.
–
A mylar ribbon is used only once. It carries a waxy or
jelled layer of ink that is designed to transfer completely to
the paper when struck with enough force. The result is a
transferred image that bonds well to the paper.
Mylar ribbon ink is not as liquid as the ink on a fabric
ribbon. Some of the ink from the impact printed image
penetrates into the paper, but the ink sits higher on the
page fiber than it does with a lithographic image.
Generally, the waxy nature of the mylar ribbon inks resists
bleaches.
Altering an impact printed image has different results, depending
on the nature of the inks and the pressures that are used. In
some cases, mylar ribbon images bond so poorly to the paper
that they can be removed with sticky tape. With enough pressure
and the proper inks, the image can bond well, but it is still
vulnerable to picking tools.
Cold pressure fix
Cold pressure fix is used by some non-impact printers. Dry ink is
fused to the paper by pressure alone. The image bonds poorly to
the paper, but it is relatively well compacted and bonded to itself.
The dry ink rests on the surface of the paper and is highly
bonded only to the top layer of paper fibers. The image may be
picked away without leaving much residue.
Xerography
Xerography is a printing process that uses heat and pressure to
melt and fuse thermoplastic dry ink to the paper. The pressure
applied during fusing forces the dry ink into the paper.
This process makes the ink very difficult to remove without
detection. A xerographic dry ink image is also difficult to alter
chemically, because the colorant material is well protected by its
plastic binder.
Even in a well-designed printing system, some factors affecting
the dry ink to paper bond remain under user control.