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Multimetal Layer Direct Negative Direct Plate

IP.com Disclosure Number: IPCOM000102073D
Original Publication Date: 1990-Oct-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Afzali-Ardakani, A: AUTHOR [+2]

Abstract

Shown in the figure is a multilayer structure comprising a rough polymer composite D, coated on a polyester substrate E, which is coated with a thin layer C of chromium, an intermediate layer B of magnesium oxide, and an outer thin aluminum film A to form a Direct Negative-Direct Plate for electroerosion printing. The press life of a direct plate made by electroerosion was found to be directly related to the adhesion of the aluminum film to the polymeric base layer composite and to the thickness of the aluminum film. Although the adhesion of the aluminum film to the base layer may be improved substantially by the introduction of a thin chromium film between the aluminum and the base layer, the presence of chromium directly below aluminum causes severe corrosion and incomplete erosion of the aluminum film.

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This is the abbreviated version, containing approximately 66% of the total text.

Multimetal Layer Direct Negative Direct Plate

       Shown in the figure is a multilayer structure comprising
a rough polymer composite D, coated on a polyester substrate E, which
is coated with a thin layer C of chromium, an intermediate layer B of
magnesium oxide, and an outer thin aluminum film A to form a Direct
Negative-Direct Plate for electroerosion printing. The press life of
a direct plate made by electroerosion was found to be directly
related to the adhesion of the aluminum film to the polymeric base
layer composite and to the thickness of the aluminum film. Although
the adhesion of the aluminum film to the base layer may be improved
substantially by the introduction of a thin chromium film between the
aluminum and the base layer, the presence of chromium directly below
aluminum causes severe corrosion and incomplete erosion of the
aluminum film.

      The DNP (Direct Negative-Direct Plate) of this invention is
fabricated by first coating a 5-10 micron-thick layer D of a
polymer-pigment composite on a polyester substrate E. A thin (50-200
A) film of chromium C (adhesion promoting) is evaporated on this base
layer D followed by a thin (200-300 A) layer of magnesium oxide B.
Finally, the outermost electroerosion layer A of aluminum (300-700 A)
is evaporated onto the oxide layer. The presence of the magnesium
oxide intermediate layer prevents the formation of a galvanic cell
between the aluminum and chromium and therefore reduces the rate of
corrosion of t...