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A technique is described whereby long life electro-erosion printing masterplates are fabricated using lift-off fabrication techniques.
English (United States)
This text was extracted from a PDF file.
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Method of Producing Masterplates Using Lift-Off Fabrication Techniques
A technique is described whereby long life electro-erosion printing
masterplates are fabricated using lift-off fabrication techniques.
Typically, the electro-erosion writing process of current structures occurs by
sending an electrical current through a resistive contact made between the
writing electrode and a metallized substrate. This is done in order to remove the
metal, selectively, in order to form the required image. The thickness of the
metal layer is generally a function of bulk resistivity. The resistance required for
the electro-erosion process generally uses aluminum, with a thickness of
approximately 400 angstroms.
Using a high current density causes immediate melting of the aluminum, such
that the material is removed physically (boiling), as well as through evaporation.
In order to obtain high current density, the area of contact is made small by
roughing up the surface of the metal. This enables a point contact to be made
which is many times smaller than the diameter of the electrode.
The adhesion of the metal layer to the base coat is critical to the longevity of
the plate, during the printing process, and is the most important factor regarding
the longevity of the plate. The concept described herein addresses the adhesion
problems and implements fabrication techniques so as to obtain better adhesion
of the metal to the basecoat.
Experiments show that when a metal film is deposited on a basecoat that is
coated with an epoxy, adhesion of the metal to the epoxy coat is enhanced. The
reason for this is that when the crosslinking is allowed to take place starting with
the epoxy in a liquid state and then contacting the metal s...