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Disclosed are etchant solutions which may render the image areas of a direct master, made by the IBM 4250 electro-erosion printer more ink- receptive.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
93% of the total text.
Page 1 of 1
User Applied Etchants for IBM 4250 Prepared Direct Master Enabling Use of
Low-Tack Press Inks
Disclosed are etchant solutions which may render the image areas of a
direct master, made by the IBM 4250 electro-erosion printer more ink- receptive.
It has been observed that such direct masters provide adequate print density
when high-tack ink is employed in the offset press. However, with low-tack inks
the print density on the paper may become very low and unacceptable. This
problem of low print density with low-tack ink was found to originate from the
residual aluminum which is left behind in the electro-erosion process. While the
residual aluminum does not totally prevent inking of the master in the written
region, its presence does in fact decrease the print density. In a series of
experiments various etchants were applied to the written area in order to reduce
the residual aluminum.
Effective etchants found include dilute (2-5%) phosphoric acid, dilute sodium
hydroxide (pH of 11-13) and dilute solutions of sodium carbonate with trisodium
phosphate. Several commercially available solutions which are used with
conventional offset plates were also found to be effective. Among them are Itek
Mega Developer of Itek Graphic System, Rochester, New York, Plate SAV-UR of R. R. Smith, Indianapolis, Indiana, and Alka-Fount of Anchor/Lithkemko, Orange
Park, Florida. These solutions may be applied to the master by swabbing,
spraying or dipping or may be automatically applied b...