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Passivation of the Aluminum Film of Direct Negative-Direct Plate

IP.com Disclosure Number: IPCOM000099529D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 37K

Publishing Venue

IBM

Related People

Afzali, A: AUTHOR [+4]

Abstract

Disclosed are several ways to passivate the aluminum film of the Direct Negative-Direct Plate (DNP) materials before top coating. This procedure converts a small part of the aluminum film to a lower heat conductive layer which partially suppresses the transfer of the heat from the hot styli to the base layer and results in far lower scratching.

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Passivation of the Aluminum Film of Direct Negative-Direct Plate

       Disclosed are several ways to passivate the aluminum film
of the Direct Negative-Direct Plate (DNP) materials before top
coating.  This procedure converts a small part of the aluminum film
to a lower heat conductive layer which partially suppresses the
transfer of the heat from the hot styli to the base layer and results
in far lower scratching.

      The Direct Negative-Direct Plate for electro-erosion printer is
a multilayer structure in which a polymer-pigment composite is coated
on a transparent substrate and then aluminized in a vacuum evaporator
to a thickness of 30-50 nm.  In the final step a thin lubricating top
coat is applied to reduce the scratching of the aluminum film during
erosion and handling.  In the course of electro-erosion, the heat
from the hot styli is transferred to the base coat polymer composite
which causes the polymer to go into plastic flow and results in
scratching of the aluminum in the non-image area.  In order to reduce
the heat flow from styli to the base coat and lower the friction
between the styli and the aluminumized underlayer, the latter is
treated.  Diluted aqueous solution of either potassium dichromate,
trisodium phosphate or sodium fluorosilicate is used to form a very
thin (1-4 nm) passivating layer.  This is less heat conducting than
the native aluminum oxide which is always present on the aluminum
film.  The materials which were prepared in...