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Method of Producing Masterplates Using Lift-Off Fabrication Techniques

IP.com Disclosure Number: IPCOM000036373D
Original Publication Date: 1989-Sep-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 2 page(s) / 13K

Publishing Venue

IBM

Related People

Hoekstra, J: AUTHOR

Abstract

A technique is described whereby long life electro-erosion printing masterplates are fabricated using lift-off fabrication techniques.

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This is the abbreviated version, containing approximately 53% of the total text.

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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...