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MEASUREMENT OF FOUNTAIN SOLUTION THICKNESS BY MICROWAVE RADIATION TECHNIQUE

IP.com Disclosure Number: IPCOM000023085D
Original Publication Date: 1976-Aug-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 232K

Publishing Venue

Xerox Disclosure Journal

Abstract

In "conventional" lithographic printing a printing master is employed, which consists of a hydrophilic non~image and a hydrophobic or oleophilic image area, An aqueous fountain solution is applied to the non-image area to maintain this region free of ink, An inking roller is

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XEROX DISCLOSURE JOURNAL

MEASUREMENT OF FOUNTAIN Proposed Classification
SOLUTION THICKNESS BY MICROWAVE U.S. Cl. 101/148
RADIATION TECHNIQUE Int. Cl. B41l 25/00

D. S. Sypula

In "conventional" lithographic printing a printing master

is employed, which consists of a hydrophilic non~image
and a hydrophobic or oleophilic image area, An aqueous

fountain solution is applied to the non-image area to
maintain this region free of ink, An inking roller is

then passed over the master and ink transfers to the
oleophilic image area but not to the non-image area
because of the aqueous fountain solution present in this

region. The print quality obtained can depend on the

thickness of the fountain solution layer present in the
non-image area of the master, A thin or incomplete
layer can result in the printing of background on print
images. A thick layer, due to a high fountain solution

feed rate, can result in low image density and background

from emulsified ink in the fountain solution, Therefore,
in the printing process, it would be advantageous to
have a device, which is capable of measuring the fountain
solution feed rate, the amount of fountain solution emul~
sified in the ink, and the thickness of the fountain
solution on the surface of the printing master,

In order to achieve a good automated control over ink-
water balance in a lithographic printing system, it is
proposed that the amount of fountain solution present
on the surface of the supply roller and printing master,

and the amount...