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Printing Methods

IP.com Disclosure Number: IPCOM000075047D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Damm, EP: AUTHOR [+3]

Abstract

Anodized tin surfaces have a previously observed affinity for reaction with oils, which can be utilized to construct photolithographic printing plates by methods outlined below: 1) A layer of photoresist or other suitable resist coated over a layer of tin is exposed and developed into an image relief stencil. The tin areas outlined by the resist are anodized to black oxide, finish and then the resist is stripped. Upon wiping the tin surface with an ink suspended in an unsaturated oil (e.g. linseed oil) containing a dry retardant additive, the ink suspension reacts (i.e. is picked up) but remains wet in the anodized image outlined areas and thereby is transferred by contact to other media (e.g. paper).

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Printing Methods

Anodized tin surfaces have a previously observed affinity for reaction with oils, which can be utilized to construct photolithographic printing plates by methods outlined below:
1) A layer of photoresist or other suitable resist coated over a

layer of tin is exposed and developed into an image relief

stencil. The

tin areas outlined by the resist are anodized to black oxide,

finish and then the resist is stripped. Upon wiping the tin

surface with an ink suspended in an unsaturated oil (e.g.

linseed

oil) containing a dry retardant additive, the ink suspension

reacts (i.e. is picked up) but remains wet in the anodized

image outlined areas and thereby is transferred by contact

to other media (e.g. paper).
2) Alternately the outlined anodized tin can be sealed with a

saturated or unsaturated oil and a water based ink used. In

this case the

anodized sealed areas act as hydrophobic surfaces which repel

the ink. The unsealed areas absorb and transfer the ink.
3) Resist outline as in method 1. A saturated oil based

nondrying ink is absorbed unreactively and transferred as the

printing medium.
4) (Intaglio) Plate completely anodized. Resist mask is formed.

Nickel is plated into the areas of anodized tin exposed by the

resist. Resist is stripped. The relief nickel defines the

intaglio image.
5) Selectively anodized tin areas (e.g. outlined by resist) are

reacted (sealed) with unsaturated oil and dried. Unsealed

areas are dissolved in concentrated nitric aci...