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FOUNTAIN SOLUTION APPLICATOR ROLLER FOR PRINTING

IP.com Disclosure Number: IPCOM000023221D
Original Publication Date: 1977-Feb-28
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 343K

Publishing Venue

Xerox Disclosure Journal

Abstract

In conventional lithographic printing a fountain solution is applied to the non-image area of the master followed by the application of ink to the master. Ink does not transfer to the non-image area provided that there is an adequate thickness of fountain solution in this region. During the printing of a master it is desirable to have a fountain solution supply system which has a short response time, is capable of the control of fountain thickness over a broad range, and is capable of uniform stable control.

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XEROX DISCLOSURE JOURNAL

FOUNTAIN SOLUTION APPLICATOR Proposed Classification
ROLLER FOR PRINTING U.S. Cl, 101/1
D. S. Sypula mt. Cl. E41f

In conventional lithographic printing a fountain solution
is applied to the non-image area of the master followed
by the application of ink to the master. Ink does not
transfer to the non-image area provided that there is an
adequate thickness of fountain solution in this region.
During the printing of a master it is desirable to have
a fountain solution supply system which has a short response
time, is capable of the control of fountain thickness over
a broad range, and is capable of uniform stable control.

Improved results are found when the fountain solution is
applied to the master by a roller, which is covered with
a deformable material such as a rubber or soft plastic,
which contains a fine series of lands or pockets on its
surface. The rubber or plastic material is hydrophilic
so that fountain solution will wet the pockets or voids.

The spatial frequency of the pockets or land may be crit-
ical as to obtaining uniform fountain solution coverage
on the master. Fountain solution is applied to this roller
by emersion in a trough of the solution, The excess is
doctored off by a doctor blade mounted in a wiping con-
figuration. At this point the pockets or depressions on
the roller contain fountain solution. This roller is then
contacted to the printing master. The amount of fountain
solution deposited on the master can be controlled by the
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